Rotating vane type steering engine mounting and positioning method

Abstract

The invention belongs to the technical field of ships, and particularly relates to a rotating vane type steering engine mounting and positioning method. Manufacturing a reference point on the rudder system: firstly, fixing a sealing flange (D) on a deck (1) at the bottom of a steering engine base, extending a steel wire (C) from an upper part (M) to a lower part (N), adjusting the steel wire (3) to enable the steel wire (3) to be located at the central position of a lower rudder pin bearing hole (A) and the central position of a rudderstock bearing hole (B), the front side, the rear side, the left side and the right side of a sealing flange (D) on a steering engine base bottom deck (1) are respectively provided with a datum point (C), the datum points (C) and a steel wire (3) are concentric, and the concentricity of an inner hole of the sealing flange (D) is checked. According to the rotating vane type steering engine installing and positioning method, the steps are simple, the rudder system installing precision can be effectively guaranteed, the deviation between the installed steering engine and the center line of a ship body is avoided, the perpendicularity deviation problem of the rudder system is eliminated, and the steering performance of the steering engine is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of ships, and more specifically, relates to a method for installing and positioning a rotary vane steering gear. Background Art

[0002] The installation of rotary vane servo is an important part of the rudder system installation. After the rudder system is bored, the position of the servo cannot be determined during the installation process. The reason is that the theoretical center line of the rudder system cannot be found again after boring, which will inevitably result in no exact installation position for the servo. Therefore, a reasonable installation method must be formulated to ensure the positioning of the servo. The rudder stock and the rudder blade need to collide and the relative position accuracy of the two needs to be absolutely guaranteed. The previous design could not meet this accuracy requirement.

[0003] In the prior art, there is a technology named "a rotary vane steering gear" and the publication (announcement) number is "CN103538711 B", which discloses a rotary vane steering gear, belonging to the field of marine machinery. The rotary vane steering gear comprises a rudder bar, a box body and a steering gear base, wherein the box body is fixedly mounted on the steering gear base, and the rotary vane steering gear further comprises a supporting device, wherein the supporting device comprises a supporting frame, and the supporting frame is mounted between the box body and the steering gear base, and a through hole matching the outer diameter of the rudder bar is provided on the supporting frame at a position corresponding to the rudder bar, and a supporting rod for supporting and positioning the rudder bar is movably mounted on the supporting frame, and when the rotary vane steering gear is in a maintenance state, the supporting rod is supported on the rudder bar, and when the rotary vane steering gear is in a working state, the supporting rod is away from the rudder bar. The rotary vane steering gear provided by the present invention adopts a supporting rod to support the rudder bar when the rotary vane steering gear is being repaired, thereby achieving the function of fixing the rudder bar, so that the ship does not need to be repaired in a dock, thereby reducing the maintenance cost of the ship.

[0004] There is a technology in the prior art named "A method for installing a rotary vane steering gear for a ship" and with a publication (announcement) number of "CN116175088A", which relates to a method for installing a rotary vane steering gear for a ship, the method comprising: first, the hydraulic installation of the rudder stock and the rudder blade is completed; second, the center of the rudder blade is adjusted to coincide with or be parallel to the center line of the hull, at which time the angle of the rudder blade is zero; third, the steering gear and the rudder stock are hydraulically installed; fourth, a three-part positioning ring is installed on the lower rudder bearing sealing seat, and the rudder stock center line is measured and adjusted to be concentric with the lower rudder bearing center line and the theoretical center line of the rudder system; fifth, the rudder blade and the rudder stock are fixed; sixth, the horizontal adjustment assembly and the vertical adjustment bolt are used to adjust the gap and height of the steering gear stator and the rotor front, rear, left and right to be equal; seventh, the steering gear is installed; eighth, the three-part positioning ring, the horizontal adjustment assembly and the vertical adjustment bolt are removed. The installation accuracy of the servo is improved, the risk probability of abnormal wear of the servo and the lower rudder bearing during use and the probability of water leakage in the seal of the lower rudder bearing are reduced, and the reliability of use is improved.

[0005] However, this technology does not involve the technical problems and technical solutions of the present application. Summary of the invention

[0006] The technical problem to be solved by the present invention is: in view of the shortcomings of the existing technology, a method for installing and positioning a rotary vane servo with simple steps is provided, which can effectively ensure the installation accuracy of the rudder system, avoid the deviation between the servo system and the centerline of the hull after installation, eliminate the problem of vertical deviation of the rudder system, and ensure the steering performance of the servo.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is:

[0008] The present invention is a method for installing and positioning a rotary vane steering gear. The installation and positioning steps of the method for installing and positioning a rotary vane steering gear are as follows:

[0009] S1. Preparation of reference points on the rudder system: first fix the sealing flange to the bottom deck of the steering gear base, pull out a steel wire from the center of the rudder system bearing hole, and extend the steel wire from the upper part to the lower part. Adjust the steel wire so that it is at the center of the lower rudder pintle bearing hole A and the center of the rudder stock bearing hole. Set reference points at the front, rear, left and right sides of the sealing flange on the bottom deck of the steering gear base, respectively, so that the reference points are concentric with the steel wire. Check the concentricity of the inner hole of the sealing flange. The error shall not exceed 0.15mm. If the error exceeds the requirement, use the hole expansion method to correct it.

[0010] S2. Installation of rudder stock, pintle, rudder blade and steering gear on board;

[0011] S3. Rudder system alignment, pad grinding and drilling;

[0012] S4. Scrape the base bolt holes to complete the installation and positioning method of the rotary vane servo.

[0013] When the rudder stock, rudder pintle, rudder blade and steering gear are installed on board: first, the rudder blade is hoisted in place, the rudder stock is installed downward from the steering gear room above, installed in the tapered hole of the rudder blade, and the sealing glands under the steering gear and on the deck of the steering gear room are put on the rudder stock; the pre-thrust of the rudder stock and the rudder blade is 4Mpa-6Mpa, the pressing amount is 6.55mm-7.12mm, and the pressing force is 60Mpa-70Mpa. When pressing, the corresponding pressure is recorded every time 1mm is pressed, and a coordinate diagram of the pressing amount-pressing force is prepared.

[0014] The pre-thrust of the rudder pintle and the rudder blade is 4Mpa-6Mpa, and the pressing amount is 1mm-2mm; the steering gear is hoisted, the rotor cone hole is aligned with the rudder stock cone, the steering gear is placed on the rudder stock cone, the steering gear and the rudder stock zero mark (mark) are aligned, and the error shall not exceed ±0.5mm, the steering gear 5 and the rudder stock are press-fitted, the pre-thrust of the press-fitting is 4Mp-5Mpa, dry pressing is 18Mpa-20Mpa and then wet pressing is performed, the pressing amount is 9.13mm±0.5mm, and the final pressure is 76Mpa-79Mpa.

[0015] When the servo and rudder stock are press-fitted, the pressing force and expansion force are recorded every 1mm, and a coordinate diagram of the pressing amount-pressing force is prepared; the rudder blade is adjusted to the zero position using a plumb bob, and the zero position difference shall not exceed ±1.5mm, and then the rudder blade is fixed.

[0016] When aligning, grinding and drilling the rudder system: first fill the gap between the lower rudder pintle and the rudder pintle sleeve with 1 / 2 thick pads around it, so that the lower rudder pintle is in the middle of the rudder pintle sleeve; use the push rod adjustment device G to adjust the rudder stock near the reference point at the bottom of the steering gear seat, so that the rudder stock is in the center of the reference point, and the deviation must not exceed 0.05mm. Use a feeler gauge to check the rudder stock bearing hole. The minimum clearance around it must not be less than 0.30mm. After passing the test, use the push rod adjustment device to adjust the position of the steering gear.

[0017] When adjusting the position of the servo, ensure that the distance from the rudder bar to the four reference points is equal, and the deviation is no more than 0.05mm. After adjustment, hold the rudder bar to prevent the rudder line (the position of the servo) from changing during grinding and drilling. Open the servo cover and use a feeler gauge to check the gap around the hydraulic cylinder and the rotor. The gap error between the hydraulic cylinder and the rotor should be within the set range. Otherwise, use the adjusting screw at the bottom of the cylinder to adjust it. After passing the adjustment, use the adjusting screw J to hold it up.

[0018] Measure the thickness of each pad between the bottom of the servo and the base. The thickness shall not be less than 25mm. If the pad is flat, a 0.05mm feeler gauge cannot be inserted in 70% of the circumference. The original machined surface should be retained without staining and grinding. If the pad is inclined, it should be ground on site one by one. The staining area of ​​each pad should not be less than 70%. A 0.05mm feeler gauge shall not be inserted in 70% of the length of the circumference. No more than 0.10mm feeler gauge is allowed in scattered parts, and the insertion depth and width shall not exceed 25mm.

[0019] After all the pads have been ground, tighten the servo base, pads and engine base with no less than six sets of callipers in preparation for drilling; since the distance between the servo and the hole to be drilled is close, use a pneumatic drill for drilling; put a feed pressure plate on the servo cover using the threaded holes on the cover to ensure that the bottom of the feed pressure plate is flat and perpendicular to the center line of the rudder system, use a right-angle pneumatic drill and feed nut to put the drill bit into the servo seat hole, use a bending ruler to adjust it and then drill. During the drilling process, the rotation of the feed nut increases the length of the pneumatic drill screw, which presses against the feed pressure plate to make the drill bit generate downward force and increase the depth of the hole; after drilling a hole, immediately tighten it with temporary bolts.

[0020] When scraping the surface of the base bolt hole: use a drilling tool to scrape the lower surface of the base with the milled hole to ensure that the hole and the lower surface of the base are in a vertical state; when using the drilling tool to scrape the surface under the servo bolt hole, use the rotation of the ratchet wrench and the rotation of the feed nut alternately to allow the rotation of the knife plate to promote the knife plate to feed the plane to remove the unevenness of the plane; the role of adjusting the top screw is to fix the knife plate, the role of the sleeve is to stabilize the knife rod, and the drilling equipment can be reused by replacing the sleeve for different holes; rotating the washer to promote the flexible rotation of the feed nut.

[0021] There are four reference points, and the adjacent reference points are 90 degrees. When the steel wire is adjusted so that the steel wire is in the center of the lower rudder pin bearing hole and the rudder stock bearing hole, the error shall not exceed 0.05mm, and the reference point and the steel wire are concentric, and the deviation shall not exceed 0.05mm.

[0022] The technical solution of the present invention is adopted, and the working principle and beneficial effects are as follows:

[0023] The rotary vane steering gear installation and positioning method of the present invention effectively realizes the installation and positioning of the steering gear and overcomes the defects in the prior art by making the reference point on the rudder system, installing the rudder stock, rudder pintle, rudder blade and steering gear on board, aligning the rudder system, grinding and drilling holes, and scraping the surface of the base bolt holes. The rotary vane steering gear installation and positioning method of the present invention has simple steps, can effectively ensure the installation accuracy of the rudder system, avoid the deviation of the steering gear from the center line of the hull after installation, eliminate the verticality deviation problem of the rudder system, and ensure the steering performance of the steering gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The following is a brief description of the contents and symbols in the drawings of this specification:

[0025] Figure 1 It is a structural schematic diagram of the manufacturing of the reference points on the rudder system of the rotary vane steering gear installation and positioning method of the present invention;

[0026] Figure 2a It is a structural schematic diagram of the rudder device adjustment and timing of the rotary vane steering gear installation and positioning method of the present invention;

[0027] Figure 2b A schematic diagram of the structure of the rotary vane steering gear installation and positioning method of the present invention when adjusting the timing;

[0028] Figure 3 It is a schematic diagram of the structure of the drilling tool of the present invention when drilling a hole;

[0029] Figure 4 for Figure 3 A schematic diagram of the local structure of the drilling tool when drilling a hole;

[0030] The markings in the attached figure are: A, lower pintle bearing hole; B, rudder stock bearing hole; C, reference point; D, sealing flange; M, upper part; N, lower part; G, push rod adjustment device; J, adjustment top screw; 1, bottom deck of steering gear base; 2, rudder stock; 3, rudder pintle; 4, rudder blade; 5, steering gear; 6, rudder blade tapered hole; 7, rotor tapered hole; 8, rudder stock cone; 9, rudder pintle sleeve; 11, rudder system bearing hole. DETAILED DESCRIPTION

[0031] The following is a further detailed description of the specific implementation of the present invention, such as the shape, structure, mutual position and connection relationship between the various components involved, the function and working principle of each part, etc., through the description of the embodiments with reference to the accompanying drawings:

[0032] As attached Figure 1 -Attached Figure 4 As shown, the present invention is a method for installing and positioning a rotary vane steering gear, and the installation and positioning steps of the rotary vane steering gear installation and positioning method are as follows:

[0033] S1. Making the reference point on the rudder system: first fix the sealing flange D to the bottom deck 1 of the steering gear base, pull out the steel wire 2 from the center of the rudder system bearing hole 11, and extend the steel wire C from the upper part M to the lower part N. Adjust the steel wire 3 so that the steel wire 3 is at the center position of the lower rudder pintle bearing hole A and the center position of the rudder stock bearing hole B. Set the reference point C on the front, rear, left and right sides of the sealing flange D on the bottom deck 1 of the steering gear base respectively, so that the reference point C and the steel wire 3 are concentric, check the concentricity of the inner hole of the sealing flange D, and the error shall not exceed 0.15mm. If the error exceeds the requirement, use the hole expansion method to correct it; S2. Install the rudder stock, rudder pintle, rudder blade and steering gear on board; S3. Align, grind and drill the rudder system; S4. Scrape the surface of the base bolt hole to complete the installation and positioning method of the rotary vane steering gear. The above steps, in view of the shortcomings of the existing technology, propose an improved technical solution through unique and ingenious technical ideas. The installation and positioning of the steering gear is effectively achieved by improving the four steps of making the reference point on the rudder system, installing the rudder stock, rudder pintle, rudder blade and steering gear on board, aligning the rudder system, grinding and drilling holes, and scraping the surface of the base bolt holes, thereby overcoming the defects existing in the prior art. The installation and positioning method of the rotary vane steering gear of the present invention has simple steps, can effectively ensure the installation accuracy of the rudder system, avoid the deviation of the steering gear from the center line of the hull after installation, eliminate the problem of verticality deviation of the rudder system, and ensure the steering performance of the steering gear.

[0034] When the rudder stock 2, rudder pintle 3, rudder blade 4 and steering gear 5 are installed on board: first, the rudder blade 4 is hoisted in place, and the rudder stock 2 is installed downward from the steering gear room above and installed in the rudder blade tapered hole 6, and the sealing gland under the steering gear 5 and on the deck of the steering gear room is put on the rudder stock 2; the pre-thrust of the rudder stock 2 and the rudder blade 4 is 4Mpa-6Mpa, the pressing amount is 6.55mm-7.12mm, and the pressing force is 60Mpa-70Mpa. When pressing, the corresponding pressure is recorded every time 1mm is pressed, and a coordinate diagram of the pressing amount-pressing force is prepared.

[0035] The pre-thrust of the rudder pintle 3 and the rudder blade 4 is 4Mpa-6Mpa, and the pressing amount is 1mm-2mm; the steering gear 5 is hoisted, the rotor tapered hole 7 is aligned with the rudder stock cone 8, the steering gear 5 is placed on the rudder stock cone 8, the zero mark (mark) of the steering gear 5 and the rudder stock 2 is aligned, and the error shall not exceed ±0.5mm, the steering gear 5 and the rudder stock 2 are press-fitted, the pre-thrust of the press-fitting is 4Mp-5Mpa, dry pressing is 18Mpa-20Mpa and then wet pressing is performed, the pressing amount is 9.13mm±0.5mm, and the final pressure is 76Mpa-79Mpa.

[0036] When the servo 5 is press-fitted to the rudder stock 2, the pressing force and expansion force are recorded every time 1 mm is pressed in, and a coordinate diagram of the pressing amount-pressing force is prepared; the rudder blade 4 is adjusted to the zero position by the plumb bob method, and the zero position difference shall not exceed ±1.5 mm, and then the rudder blade 4 is fixed.

[0037] When aligning, grinding and drilling the rudder system: first fill the gap between the lower rudder pintle 3 and the rudder pintle sleeve 9 with gaskets with a thickness of 1 / 2 around, so that the lower rudder pintle 3 is in the middle of the rudder pintle sleeve 9; use the push rod adjustment device G to adjust the rudder stock 2 near the reference point C at the lower part of the steering gear seat, so that the rudder stock 2 is in the center of the reference point C, and the deviation shall not exceed 0.05mm. Use a feeler gauge to check the rudder stock bearing hole B. The minimum clearance around shall not be less than 0.30mm. After passing the test, use the push rod adjustment device G to adjust the position of the steering gear 5.

[0038] When adjusting the position of the steering gear 5, ensure that the distance from the rudder bar 2 to the four reference points C is equal, and the deviation is not more than 0.05mm. After adjustment, hold the rudder bar 2 to prevent the rudder line (the position of the steering gear) from changing during grinding and drilling. Open the upper cover of the steering gear 5 and use a feeler gauge to check the gap around the hydraulic cylinder and the rotor. The gap error between the hydraulic cylinder and the rotor is within the set range. Otherwise, use the adjusting screw J at the bottom of the cylinder body to adjust it. After passing the adjustment, use the adjusting screw J to hold it.

[0039] Measure the thickness of each pad between the bottom of the servo 5 and the base. The thickness shall not be less than 25mm. If the pad is flat, a 0.05mm feeler gauge cannot be inserted in 70% of the circumference. The original machined surface is retained without staining and grinding. If the pad is inclined, it shall be ground on site one by one. The staining area of ​​each pad shall not be less than 70%. A 0.05mm feeler gauge shall not be inserted in 70% of the length of the circumference. A feeler gauge of no more than 0.10mm is allowed in scattered parts, and the insertion depth and width shall not exceed 25mm.

[0040] After all the pads are ground, tighten the steering gear base, pads and engine base with no less than six sets of callipers to prepare for drilling; since the distance between the steering gear 5 and the hole to be drilled is close, use a pneumatic drill for drilling; put a feed plate on the steering gear upper cover using the threaded holes on the upper cover, ensure that the bottom of the feed plate is flat and perpendicular to the center line of the rudder system, use a right-angle pneumatic drill and a feed nut to put the drill bit into the steering gear seat hole, and use a bending ruler to adjust it (see Figure 3 ) and then drill. During the drilling process, the rotation of the feed nut increases the length of the air drill screw, which pushes the feed pressure plate to make the drill bit generate downward force and increase the depth of the drilling; after each hole is drilled, it is immediately tightened with a temporary bolt.

[0041] When scraping the base bolt hole: Use a drilling tool to scrape the base bottom surface after the hole is milled to ensure that the hole is perpendicular to the base bottom surface; use a drilling tool (see Figure 4 ) When scraping the surface below the bolt hole of the servo 5, rotate the ratchet wrench and the feed nut alternately, so that the rotation of the knife plate can prompt the knife plate to cut the surface to remove the unevenness of the surface; the function of adjusting the top screw is to fix the knife plate, the function of the sleeve is to stabilize the knife rod, and the drilling equipment can be reused for different holes by replacing the sleeve; rotating the washer prompts the feed nut to rotate flexibly.

[0042] There are four reference points C, and the adjacent reference points C are 90°. When the steel wire is adjusted so that the steel wire is at the center of the lower rudder pin bearing hole A and the rudder stock bearing hole B, the error shall not exceed 0.05mm, and the reference point C and the steel wire 3 are concentric, and the deviation shall not exceed 0.05mm.

[0043] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A method for installing and positioning a rotary vane steering gear, characterized in that: The installation and positioning steps of the rotary vane steering gear installation and positioning method are as follows: S1. Preparation of reference points on the rudder system: first fix the sealing flange (D) to the bottom deck (1) of the steering gear base, pull out the steel wire (2) from the center of the rudder system bearing hole (11), and extend the steel wire (C) from the upper part (M) to the lower part (N). Adjust the steel wire (3) so that the steel wire (3) is located at the center of the lower rudder pintle bearing hole (A) and the center of the rudder stock bearing hole (B). Set reference points (C) at the front, rear, left and right sides of the sealing flange (D) on the bottom deck (1) of the steering gear base, respectively, so that the reference point (C) and the steel wire (3) are concentric. Check the concentricity of the inner hole of the sealing flange (D). The error shall not exceed 0.15 mm. If the error exceeds the requirement, use the hole expansion method to correct it. S2. Installation of rudder stock, pintle, rudder blade and steering gear on board; S3. Rudder system alignment, pad grinding and drilling; S4. Scrape the base bolt holes to complete the installation and positioning method of the rotary vane servo.

2. The method for installing and positioning a rotary vane steering gear according to claim 1, characterized in that: When the rudder stock (2), rudder pintle (3), rudder blade (4) and steering gear (5) are installed on board, the rudder blade (4) is hoisted in place first, the rudder stock (2) is installed from the upper steering gear room downwards and installed in the rudder blade tapered hole (6), and the sealing gland under the steering gear (5) and on the deck of the steering gear room is sleeved on the rudder stock (2); the pre-thrust of the rudder stock (2) and the rudder blade (4) is 4Mpa-6Mpa, the pressing amount is 6.55mm-7.12mm, and the pressing force is 60Mpa-70Mpa. When pressing, the corresponding pressure is recorded every time 1mm is pressed, and a coordinate diagram of the pressing amount-pressing force is prepared.

3. The method for installing and positioning a rotary vane steering gear according to claim 3, characterized in that: The pre-thrust of the rudder pintle (3) and the rudder blade (4) is 4Mpa-6Mpa, and the press-in amount is 1mm-2mm; the steering gear (5) is hoisted, the rotor conical hole (7) is aligned with the rudder stock cone (8), the steering gear (5) is placed on the rudder stock cone (8), the zero mark of the steering gear (5) and the rudder stock (2) are aligned, and the error shall not exceed ±0.5mm, the steering gear (5) and the rudder stock (2) are press-fitted, the pre-thrust of the press-fitting is 4Mp-5Mpa, dry pressing is 18Mpa-20Mpa and then wet pressing is performed, the press-in amount is 9.13mm±0.5mm, and the final pressure is 76Mpa-79Mpa.

4. The method for installing and positioning a rotary vane steering gear according to claim 4, characterized in that: When the steering gear (5) and the rudder stock (2) are press-fitted, the pressing force and the expansion force are recorded every time 1 mm is pressed in, and a pressing amount-pressing force coordinate diagram is prepared; the rudder blade (4) is adjusted to the zero position by a plumb bob method, and the zero position difference shall not exceed ±1.5 mm, and then the rudder blade (4) is fixed.

5. The method for installing and positioning a rotary vane steering gear according to claim 1, characterized in that: When aligning, grinding and drilling the rudder system: first, fill the gap between the lower rudder pintle (3) and the rudder pintle sleeve (9) with a 1 / 2 thick pad around it, so that the lower rudder pintle (3) is located in the middle of the rudder pintle sleeve (9); use the push rod adjustment device (G) to adjust the rudder stock (2) near the reference point (C) at the bottom of the steering gear seat, so that the rudder stock (2) is located at the center of the reference point (C), and the deviation shall not exceed 0.05mm; check the rudder stock bearing hole (B) with a feeler gauge, and the minimum clearance around it shall not be less than 0.30mm. After passing the test, use the push rod adjustment device (G) to adjust the position of the steering gear (5).

6. The method for installing and positioning a rotary vane steering gear according to claim 5, characterized in that: When adjusting the position of the steering gear (5), ensure that the distances from the rudder bar (2) to the four reference points (C) are equal and the deviation is not greater than 0.05 mm. After adjustment, hold the rudder bar (2) to prevent the rudder line from changing during grinding and drilling. Open the upper cover of the steering gear (5) and use a feeler gauge to check the clearance around the hydraulic cylinder and the rotor. If the clearance error between the hydraulic cylinder and the rotor is within the set range, otherwise adjust it with the adjustment screw (J) at the bottom of the cylinder body. After passing the adjustment, hold it with the adjustment screw (J).

7. The method for installing and positioning a rotary vane steering gear according to claim 6, characterized in that: Measure the thickness of each pad between the bottom of the steering gear (5) and the base. The thickness shall not be less than 25 mm. If the pad is flat, a 0.05 mm feeler gauge cannot be inserted at 70% of the circumference. Keep the original machined surface without staining and grinding. If the pad is inclined, it shall be ground on site one by one. The stained area of ​​each pad shall not be less than 70%. A 0.05mm feeler gauge shall not be inserted in 70% of the length of the surrounding area. A feeler gauge of no more than 0.10mm is allowed in scattered areas, and the insertion depth and width shall not exceed 25mm.

8. The method for installing and positioning a rotary vane steering gear according to claim 7, characterized in that: After all the pads have been ground, the steering gear base, pads and engine base are clamped with no less than six sets of clamps to prepare for drilling; since the steering gear (5) is close to the drilled hole, a pneumatic drill is used for drilling; a feed pressure plate is installed on the steering gear upper cover using the threaded hole of the upper cover to ensure that the lower side of the feed pressure plate is flat and perpendicular to the center line of the rudder system, and the drill bit is placed in the steering gear seat hole using a right-angle pneumatic drill and a feed screw nut, and the hole is drilled after adjustment with a bending ruler. During the drilling process, the rotation of the feed nut increases the length of the pneumatic drill screw, so that the drill bit generates a downward force against the feed pressure plate, thereby increasing the depth of the drilled hole; after each hole is drilled, it is immediately tightened with a temporary bolt.

9. The method for installing and positioning a rotary vane steering gear according to claim 1, characterized in that: When the base bolt hole is scraped flat: the lower plane of the base with the milled hole is scraped flat with a drilling tool to ensure that the hole and the lower plane of the base are in a vertical state; when the lower surface of the steering gear (5) bolt hole is scraped flat with the drilling tool (10), the rotation of the ratchet wrench and the rotation of the feed nut are alternately performed to allow the rotation of the knife plate to promote the knife plate to cut the plane to remove the unevenness of the plane; the function of adjusting the top screw is to fix the knife plate, the function of the sleeve is to stabilize the knife rod, and the drilling equipment can be reused by replacing the sleeve for different holes; rotating the washer promotes the flexible rotation of the feed nut.

10. The method for installing and positioning a rotary vane steering gear according to claim 1, characterized in that: Four reference points (C) are set, and the adjacent reference points (C) are 90 degrees; when the steel wire is adjusted so that the steel wire is at the center of the lower rudder pintle bearing hole A and the rudder stock bearing hole B, the error shall not exceed 0.05mm, and the reference point (C) and the steel wire (3) are concentric, and the deviation shall not exceed 0.05mm.

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