Rudder detection hole cover plate and manufacturing method thereof

Abstract

The application discloses a rudder blade detection hole cover plate, a connecting tool is arranged between the detection hole cover plate and a rudder blade sealing plate, the connecting tool comprises fixed ear plates, a rotating crank, a rotating shaft, a first limiting rod and a second limiting rod, the fixed ear plates are coaxially arranged, the fixed ear plates are fixedly arranged on the rudder blade sealing plate, one end of the rotating crank is rotationally connected with the fixed ear plates through the rotating shaft, the other end of the rotating crank is fixedly connected with the detection hole cover plate, the first limiting rod and the second limiting rod are arranged on the rotating crank, quick rotation operation can be realized, the operation process is simple, construction efficiency is high, and safety is high; the manufacturing method of the rudder blade detection hole cover plate can reduce construction difficulty, improve construction efficiency, is simple in process and safe in operation.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of ship engineering, and particularly relates to a rudder blade detection hole cover plate and a manufacturing method thereof. BACKGROUND

[0002] The rudder blade is an important component of the ship propulsion system. During the process of the ship sailing on water, the rudder blade is used to adjust the sailing direction by adjusting the rotation angle of the rudder blade at the tail of the ship. In order to facilitate the installation, detection, maintenance and repair of the rudder rod and the rudder pin, a rudder blade cover plate is usually arranged at the upper right side of the rudder blade structure. The rudder blade cover plate is installed and welded after the completion of the installation of the rudder rod and the rudder pin during the period of the ship being loaded and closed. The rudder blade cover plate is provided with a detection hole and a detection hole cover plate. The detection hole cover plate is connected with the rudder blade cover plate through fixing bolts, and the closing and opening of the detection hole cover plate can be realized.

[0003] The prior art is to weld a flat iron around the edge of the detection hole on the inner surface of the rudder blade cover plate, and to discontinuously insert and weld lug plates at the edge of the outer contour of the detection hole cover plate. After the flat iron and the lug plates are uniformly and closely attached, the bolt holes are drilled on site, the nuts are welded on the inner surface of the bolt holes, and all the bolts are installed and tightened to complete the closing and fixing of the detection hole cover plate. However, the prior art has the following disadvantages:

[0004] (1) A flat iron needs to be welded around the edge of the detection hole on the inner surface of the rudder blade cover plate, which requires a large amount of welding construction, and the flat iron has a large extension width. During the welding process, a large outward bending deformation is easily generated, which needs to be corrected after welding, otherwise the outer surface of the cover plate and the outer surface of the rudder blade cover plate will not be flush after the cover plate is closed, which increases the resistance of the water flow to the ship sailing;

[0005] (2) The flat iron reduces the effective through cross-sectional area of the detection hole in the opened state of the detection hole cover plate, which is not conducive to the entry and exit of the construction personnel through the detection hole;

[0006] (3) A plurality of lug plates need to be cut and made, the number of the lug plates is large, the precision requirement of the cutting and making of the lug plates is high, and the lug plates are embedded in the inside of the cover plate. The periphery of the contact surface between the lug plate and the cover plate needs to be welded, which requires a large amount of welding work, and the surface of the inner side weld needs to be ground and treated. The flatness requirement of the lug plate after welding is high;

[0007] (4) The close attachment between the flat iron and the lug plate needs to be high, otherwise the combined drilling and the installation of the bolts will be adversely affected;

[0008] (5) A plurality of nuts need to be installed and welded. Since the detection hole cover plate is closed, the bolts can only be installed and fixed from the outside, and the bolt holes have no threaded processing. Therefore, the nuts need to be pre-installed and welded on the inner side of the flat iron of the rudder blade cover plate, and the installation and welding precision requirement is high;

[0009] (6) The detection hole cover plate needs to be completely separated from the rudder blade structure after being opened, the detection hole cover plate is only fixedly connected with the rudder blade cover plate through bolts, and the detection hole cover plate needs to be completely taken off from the rudder blade cover plate and placed in a safe position during opening, which is inconvenient to operate;

[0010] (7) The opening and closing process of the detection hole cover plate is complex and unsafe, and the opening and closing process of the detection hole cover plate cannot be operated by one person, and in the process of loosening the fixing bolts, another person needs to take measures to prevent the detection hole cover plate from slipping and falling, which is complex and dangerous;

[0011] (8) The rudder blade cover plate is not simulated and preassembled, the rudder blade cover plate may have shape deviation and need to be adjusted or have excess and need to be cut, which increases the construction difficulty and construction period of the rudder blade installation stage and has an adverse effect on the ship loading and closing period. SUMMARY

[0012] The technical problem to be solved by the present application is to provide a rudder blade detection hole cover plate and a manufacturing method thereof, which can effectively solve the problems of the prior art, such as the difficulty in manufacturing and assembling the detection hole cover plate, low construction efficiency, and complex opening and closing process of the detection hole cover plate.

[0013] In order to solve the above technical problems, the technical scheme adopted by one aspect of the present application is as follows:

[0014] A rudder blade detection hole cover plate, the detection hole cover plate is connected with the rudder blade cover plate through connecting bolts, the connecting bolts are provided in plurality and are arranged in a circumferential interval along the detection hole cover plate, a connecting tool is arranged between the detection hole cover plate and the rudder blade cover plate, the connecting tool comprises a fixed lug plate, a rotating crank, a rotating shaft, a first limiting rod and a second limiting rod, the fixed lug plate is provided in two and coaxially arranged, the two fixed lug plates are fixedly arranged on the rudder blade cover plate, one end of the rotating crank is rotatably connected with the fixed lug plate through the rotating shaft, the other end of the rotating crank is fixedly connected with the detection hole cover plate, the first limiting rod and the second limiting rod are arranged on the rotating crank, when the detection hole cover plate is in a completely open state, the first limiting rod abuts against the inner side of one end of the rudder blade cover plate close to the detection hole cover plate, the second limiting rod abuts against the inner side of one end of the rudder blade cover plate away from the detection hole cover plate, a first residual hole is arranged on the outer periphery of the detection hole cover plate, a second residual hole is arranged on one end of the rudder blade cover plate close to the detection hole cover plate, when the rudder blade cover plate and the detection hole cover plate are closed, the first residual hole and the second residual hole form a bolt hole for the connecting bolt.

[0015] As a preferred scheme of the present application, the second limiting rod comprises a fixed rod, a telescopic rod and fixing bolts, the fixed rod is connected with the rotating crank through a connecting rod, the fixed rod is arranged as a hollow cylinder, the telescopic rod is arranged in the fixed rod in an up and down adjustable mode, the fixing bolts are arranged in plurality, the lower end of the fixed rod is provided with through holes for the fixing bolts to pass through, the fixing bolts extend into the through holes and abut against the telescopic rod, the connecting rod is fixedly connected with the fixed rod, and when the detection hole cover plate is in a fully open state, the telescopic rod abuts against the rudder plate.

[0016] As a preferred scheme of the present application, the upper end of the telescopic rod is provided with a handle, and the fixed rod is provided with a slot which is in sliding cooperation with the handle and extends along the length direction of the fixed rod.

[0017] As a preferred scheme of the present application, the connecting tool is arranged in two, and the two connecting tools are arranged in a spaced mode along the height direction of the detection hole cover plate.

[0018] As a preferred scheme of the present application, the fixed ear plate is provided with a through hole for the rotating shaft to pass through, and the through hole is arranged as a waist-shaped hole.

[0019] Another aspect of the present application adopts the technical scheme as follows:

[0020] A manufacturing method of a rudder detection hole cover plate adopts a rudder detection hole cover plate, and comprises the following steps:

[0021] Step S1: the inner and outer surfaces of the rudder plate are precisely drawn with a contour of the detection hole cover plate;

[0022] Step S2: the position of the bolt hole of the connecting bolt on the outer surface contour of the detection hole cover plate is precisely drawn according to the drawing requirement, the outer circle contour line of the bolt hole is extended by 30mm-50mm outward, and the contour of the detection hole cover plate passes through the bolt hole;

[0023] Step S3: the adjacent position of the contour and the bolt hole of the detection hole cover plate is radially drawn and cut, and the relative integrity between the rudder plate and the detection hole cover plate is kept, and the stability of the relative position between the rudder plate and the detection hole cover plate is ensured, wherein the cutting direction is perpendicular to the surface of the detection hole cover plate;

[0024] Step S4: the center line position of the bolt hole is drilled with an inner hole from the outer surface of the rudder plate, wherein the drilling direction of the inner hole is perpendicular to the surface of the rudder plate, and the drilling thickness of the inner hole is consistent with the plate thickness of the rudder plate;

[0025] Step S5: drilling an outer circle hole from the center line position of the bolt hole on the outer surface of the rudder plate, wherein the drilling direction of the outer circle hole is perpendicular to the surface of the rudder plate, the drilling position of the outer circle hole is concentric with the drilling position of the inner circle hole, and the drilling thickness of the outer circle hole is the sum of the thickness of the bolt head of the connecting bolt and the thickness of the spring washer;

[0026] Step S6: thread processing the inner circle hole and installing and tightening all the spring washers and connecting bolts.

[0027] Step S7: turn over the detection hole cover plate so that the inner side faces upward, draw the mounting position of the connecting tool on the inner side of the detection hole cover and the inner side of the rudder plate according to the drawing coordinate size, weld the fixing lug plate on the rudder plate, weld the rotating crank on the detection hole cover plate, and finally pass the rotating shaft through the fixing lug plate and the rotating crank.

[0028] Step S8: cut the remaining uncut area of the detection hole cover plate, wherein the cutting direction is perpendicular to the surface of the detection hole cover plate.

[0029] Step S9: after the detection hole cover plate and the rudder plate are completely cut, use a flat copper hammer or a wooden hammer to perform small energy intensive hammering along the contour edge of the detection hole cover plate within a range of 10-20 mm, sufficiently release the residual internal stress of the detection hole cover plate after being completely cut, remove the connecting bolts, and completely open the detection hole cover plate.

[0030] Step S10: weld and install a closing limiting block on the inner side of the rudder plate, the outer side of the closing limiting block is tightly and flushly attached to the inner side of the rudder plate, and one end of the closing limiting block protrudes from the edge of the rudder plate by 5-10 mm toward the detection hole cover plate.

[0031] Step S11: polish and paint the opening perimeter of the detection hole cover plate, close the detection hole cover plate, and install and tighten all the connecting bolts.

[0032] As a preferred scheme of the present application, before step S1, the following step S0 is further included: cutting the rudder plate according to the requirements of the development drawing of the rudder plate.

[0033] As a preferred scheme of the present application, between step S0 and step S1, the following step is further included: after the rudder body is manufactured, the rudder plate is pre-assembled on the rudder body, the contour position allowance of the rudder plate is cut and a welding bevel is opened, and the welding bevel angle and the assembly gap of the butt joint between the rudder plate and the adjacent structure are ensured to meet the related design requirements.

[0034] As a preferred scheme of the present application, in step S1, a certain amount of allowance is left in the blanking and cutting of the rudder plate, and the rudder plate is processed in shape by mechanical pressing or water-fire bending after the blanking and cutting is completed.

[0035] As a preferred scheme of the present application, in step S5, the diameter of the outer circle hole is 5mm-10mm larger than the diameter of the circumscribed circle of the bolt head of the connecting bolt.

[0036] As a preferred scheme of the present application, before step S7, the first limiting rod and the second limiting rod are both welded on the rotating crank.

[0037] As a preferred scheme of the present application, in step S7, the rotating shaft is at the uppermost end of the through hole.

[0038] As a preferred scheme of the present application, in step S10, before the closing limiting block is welded and fixed with the rudder plate, a groove is formed on the rudder plate at the connection of the closing limiting block, wherein the groove angle is 45±5°, and the groove depth is 5mm-10mm.

[0039] As a preferred scheme of the present application, in step S10, the weld joint between the closing limiting block and the rudder plate is ground after welding.

[0040] The rudder detection hole cover plate provided by the present application has the following beneficial effects compared with the prior art:

[0041] When it is needed to open the detection hole cover plate, a strong magnet with a switch and a handle is installed on the outer side of the detection hole cover plate, and all the connecting bolts and spring washers around the detection hole cover plate are removed, the detection hole cover plate is pulled out by the strong magnet, at this time, the detection hole cover plate drives the rotating crank to rotate, since the first limiting rod and the second limiting rod are arranged on the rotating crank, when the first limiting rod abuts against the inner side of the end of the rudder plate close to the detection hole cover plate, and the second limiting rod abuts against the inner side of the end of the rudder plate away from the detection hole cover plate, the detection hole cover plate is in a completely open state, when it is needed to close the detection hole cover plate, the detection hole cover plate is rotated inward until the detection hole cover plate approaches the rudder plate and is approximately parallel, and all the connecting bolts are installed and tightened, the closing action of the detection hole cover plate is completed; thus, the detection hole cover plate can be opened without being separated from the rudder structure, and the opening and closing operation of the detection hole cover plate can be realized by simple rotating operation, the detection hole cover plate will not be completely separated from the rudder structure after being opened, and the operation is convenient and stable.

[0042] The manufacturing method of the rudder detection hole cover plate provided by the present application has the following beneficial effects compared with the prior art:

[0043] (1) without the need to detect the inner surface of the rudder plate of the hole edge lap welding a circle of flat iron, simple construction process, there is no flat iron after welding angle deformation problem, effectively prevent the cover plate after closing the outer surface of the cover plate and the outer surface of the rudder plate uneven, avoid to increase the resistance of water flow on the ship navigation;

[0044] (2) without the need to detect the inner surface of the rudder plate of the hole edge lap welding a circle of flat iron, will not reduce the effective through section area of the detection hole when the detection hole cover plate is opened, which is beneficial to the construction personnel to enter and exit the detection hole;

[0045] (3) without the need to open the detection hole cover plate and ear plate welding, simple construction process;

[0046] (4) without the need to install the welding nut, reduce the construction difficulty, improve the construction efficiency;

[0047] (5) the detection hole cover plate will not completely separate from the rudder structure after opening, the detection hole cover plate does not need to be completely removed from the rudder plate and placed in a safe position when the detection hole cover plate is opened, through simple rotation and limiting operation, the opened detection hole cover plate can be stably fixed on the side of the rudder, convenient operation, high stability;

[0048] (6) the detection hole cover plate is opened and closed by rotating the assembly, which can realize fast rotation operation, simple operation process, high construction efficiency and high safety, and the opening and closing process of the detection hole cover plate can be operated by one person, without the need for others to take measures to prevent the detection hole cover plate from slipping off during the process of loosening the fixing bolt, simple process, safe operation;

[0049] (7) the rudder plate is simulated and preassembled in advance, the shape deviation and excess of the rudder plate are preprocessed, which effectively reduces the construction difficulty and construction period of the rudder installation stage, and is beneficial to shorten the ship loading and closing period. BRIEF DESCRIPTION OF DRAWINGS

[0050] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings of the embodiments will be briefly introduced below.

[0051] Figure 1 is a structure diagram of a rudder detection hole cover plate provided by the embodiments of the present application;

[0052] Figure 2 is a structure diagram of a second limiting rod;

[0053] Figure 3 is a structure diagram of a first residual hole and a second residual hole;

[0054] Figure 4 is a structure diagram of a fixed ear plate;

[0055] Figure 5 is a structure schematic diagram of a rudder detection hole cover plate in an open state provided by an embodiment of the present application;

[0056] Figure 6 is a structure schematic diagram of a rudder detection hole cover plate in a fully open state provided by an embodiment of the present application;

[0057] Figure 7 is a structure schematic diagram of a rudder detection hole cover plate provided by an embodiment of the present application;

[0058] Figure 8 is a structure schematic diagram of step S3;

[0059] Figure 9 is a structure schematic diagram of step S6;

[0060] Figure 10 is a structure schematic diagram of step S7;

[0061] Figure 11 is a structure schematic diagram of step S8;

[0062] Figure 12 is a structure schematic diagram of step S10;

[0063] Figure 13 is a structure schematic diagram of a closing limiting block.

[0064] Markings in the figure:

[0065] detection hole cover plate 1; connecting bolt 2; rudder sealing plate 3; connecting tool 4; fixed lug plate 5; rotating crank 6; rotating shaft 7; first limiting rod 8; second limiting rod 9; first residual hole 10; second residual hole 11; bolt hole 12; fixed rod 13; telescopic rod 14; fixed bolt 15; connecting rod 16; handle 17; through hole 18; magnet 19; closing limiting block 20; DETAILED DESCRIPTION

[0066] The specific embodiments of the present application will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application, but are not used to limit the scope of the present application.

[0067] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. It should be understood that the terms "first", "second", and the like are used to describe various information in the present application, but these information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, the "first" information can also be referred to as "second" information without departing from the scope of the present application, and similarly, the "second" information can also be referred to as "first" information.

[0068] As Figures 1 to 4 shown, one aspect of the preferred embodiment of the present application provides a rudder detection hole cover plate, the detection hole cover plate 1 is connected with the rudder sealing plate 3 through the connecting bolt 2, the connecting bolt 2 is provided with a plurality of and is arranged in a circumferential interval along the detection hole cover plate 1, a connecting tool 4 is arranged between the detection hole cover plate 1 and the rudder sealing plate 3, the connecting tool 4 includes a fixed lug plate 5, a rotating crank 6, a rotating shaft 7, a first limiting rod 8 and a second limiting rod 9, the fixed lug plate 5 is provided with two and coaxially arranged, both the fixed lug plates 5 are fixedly arranged on the rudder sealing plate 3, one end of the rotating crank 6 is rotatably connected with the fixed lug plate 5 through the rotating shaft 7, the other end of the rotating crank 6 is fixedly connected with the detection hole cover plate 1, both the first limiting rod 8 and the second limiting rod 9 are arranged on the rotating crank 6, when the detection hole cover plate 1 is in a fully open state, the first limiting rod 8 abuts against the inner side of one end of the rudder sealing plate 3 close to the detection hole cover plate 1, the second limiting rod 9 abuts against the inner side of one end of the rudder sealing plate 3 away from the detection hole cover plate 1, a first residual hole 10 is arranged on the outer periphery of the detection hole cover plate 1, a second residual hole 11 is arranged on one end of the rudder sealing plate 3 close to the detection hole cover plate 1, when the rudder sealing plate 3 and the detection hole cover plate 1 are closed, the first residual hole 10 and the second residual hole 11 form a bolt hole 12 for the connecting bolt 2.

[0069] As Figures 5 to 6As shown, when the detection hole cover plate 1 needs to be opened, the strong magnet 19 with a switch and a handle 17 is installed on the outer side of the detection hole cover plate 1, and all the connecting bolts 2 and spring washers around the periphery of the detection hole cover plate 1 are removed, and the detection hole cover plate 1 is pulled out by the strong magnet 19, at this time, the detection hole cover plate 1 drives the rotating crank 6 to rotate, because the rotating crank 6 is provided with the first limiting rod 8 and the second limiting rod 9, when the first limiting rod 8 abuts against the inner side of the end of the rudder vane cover plate 3 close to the detection hole cover plate 1, and the second limiting rod 9 abuts against the inner side of the end of the rudder vane cover plate 3 away from the detection hole cover plate 1, then the detection hole cover plate 1 is in a completely open state, when the detection hole cover plate 1 needs to be closed, the detection hole cover plate 1 is rotated inward until the detection hole cover plate 1 is close to the rudder vane cover plate 3 and is approximately parallel, all the connecting bolts 2 are installed and tightened, and the closing action of the detection hole cover plate 1 is completed; in this way, the detection hole cover plate 1 can be opened without being separated from the rudder vane structure, and the opening and closing operation of the detection hole cover plate 1 can be realized by simple rotation operation, the detection hole cover plate 1 will not be completely separated from the rudder vane structure after being opened, and the operation is convenient and stable.

[0070] Exemplarily, the second limiting rod 9 comprises a fixed rod 13, a telescopic rod 14 and a plurality of fixed bolts 15, the fixed rod 13 is connected with the rotating crank 6 through a connecting rod 16, the fixed rod 13 is provided as a hollow cylinder, the telescopic rod 14 is adjustably arranged in the fixed rod 13, the fixed bolts 15 are provided as a plurality of, the lower end of the fixed rod 13 is provided with a plurality of through holes 18 for the fixed bolts 15 to pass through, the fixed bolts 15 extend into the through holes 18 and abut against the telescopic rod 14, the connecting rod 16 is fixedly connected with the fixed rod 13, and the telescopic rod 14 abuts against the rudder vane cover plate 3 when the detection hole cover plate 1 is in a completely open state. It also needs to be explained that in other embodiments, the first limiting rod 8 can be provided in the same form as the second limiting rod 9 according to actual needs.

[0071] Exemplarily, the upper end of the telescopic rod 14 is provided with a handle 17, and the fixed rod 13 is provided with a slot which is in sliding cooperation with the handle 17, and the slot extends along the length direction of the fixed rod 13.

[0072] Exemplarily, the connecting tool 4 is provided as two, and the two connecting tools 4 are arranged in a spaced manner along the height direction of the detection hole cover plate 1.

[0073] Exemplarily, the fixed ear plate 5 is provided with a through hole 18 for the rotating shaft 7 to pass through, and the through hole 18 is provided as a waist-shaped hole.

[0074] As shown in the embodiment of the application, Figures 8 to 13 A manufacturing method of the rudder detection hole cover plate of the preferred embodiment of the application comprises the following steps:

[0075] Step S1: draw the outline of the detection hole cover plate 1 on the inner and outer surfaces of the rudder plate 3 for one full circle;

[0076] Step S2: draw the position of the bolt hole 12 of the connecting bolt 2 on the outer surface of the detection hole cover plate 1 according to the drawing requirements, where the outer circle contour line of the bolt hole 12 is extended outward by 30-50 mm, and the outline of the detection hole cover plate 1 passes through the bolt hole 12;

[0077] Step S3: radially cut the outline of the detection hole cover plate 1 and the adjacent position of the bolt hole 12, and keep the relative integrity between the rudder plate 3 and the detection hole cover plate 1 to ensure the stability of the relative position between the rudder plate 3 and the detection hole cover plate 1, where the cutting direction is perpendicular to the surface of the detection hole cover plate 1;

[0078] Step S4: drill an inner hole on the center line position of the bolt hole 12 from the outer surface of the rudder plate 3, where the drilling direction of the inner hole is perpendicular to the surface of the rudder plate 3, and the drilling thickness of the inner hole is consistent with the thickness of the rudder plate 3;

[0079] Step S5: drill an outer hole on the center line position of the bolt hole 12 from the outer surface of the rudder plate 3, where the drilling direction of the outer hole is perpendicular to the surface of the rudder plate 3, the drilling position of the outer hole is concentric with the drilling position of the inner hole, and the drilling thickness of the outer hole is the sum of the thickness of the bolt head of the connecting bolt 2 and the thickness of the spring washer;

[0080] Step S6: thread the inner hole and install all spring washers and connecting bolts 2;

[0081] Step S7: turn over the detection hole cover plate 1 so that the inner side faces up, draw the installation position of the connecting tool 4 on the inner side of the detection hole cover plate 1 and the inner side of the rudder plate 3 according to the drawing coordinate size, weld the fixing lug 5 on the rudder plate 3, weld the rotating crank 6 on the detection hole cover plate 1, and finally pass the rotating shaft 7 through the fixing lug 5 and the rotating crank 6;

[0082] Step S8: cut the remaining uncut area of the detection hole cover plate 1, where the cutting direction is perpendicular to the surface of the detection hole cover plate 1;

[0083] Step S9: After the detection hole cover plate 1 is completely cut off from the rudder plate 3, a small amount of energy is concentrated on the edge of the detection hole cover plate 1 within a range of 10-20 mm, and the residual internal stress of the detection hole cover plate 1 after being completely cut off is released, and then the connecting bolts 2 are removed to completely open the detection hole cover plate 1.

[0084] Step S10: A closing limiting block 20 is welded on the inner side of the rudder plate 3, the outer side of the closing limiting block 20 is flush with the inner side of the rudder plate 3, and one end of the closing limiting block 20 protrudes from the edge of the rudder plate 3 by 5-10 mm towards the detection hole cover plate 1.

[0085] Step S11: The opening perimeter of the detection hole cover plate 1 is polished and painted, the detection hole cover plate 1 is closed, and all connecting bolts 2 are installed and tightened.

[0086] Exemplarily, before step S1, the following step S0 is further included: according to the requirements of the rudder plate 3 development drawing, the rudder plate 3 is cut and cut.

[0087] Exemplarily, between step S0 and step S1, the following step is further included: after the rudder body is completed, the rudder plate 3 is pre-assembled on the rudder body, the contour position allowance of the rudder plate 3 is cut and welded, and the welding bevel angle and the assembly gap of the butt joint between the rudder plate 3 and the adjacent structure are ensured to meet the relevant design requirements.

[0088] Exemplarily, in step S1, a certain amount of allowance is left after cutting the rudder plate 3, and the shape of the rudder plate 3 is processed by mechanical pressing or water fire bending after cutting.

[0089] Exemplarily, in step S5, the diameter of the outer circle hole is 5-10 mm larger than the diameter of the outer circle of the bolt head of the connecting bolt 2.

[0090] Exemplarily, before step S7, the first limiting rod 8 and the second limiting rod 9 are both welded on the rotating crank 6.

[0091] Exemplarily, in step S7, the rotating shaft 7 is at the uppermost end of the through hole 18.

[0092] It also needs to be explained that when the detection hole cover plate 1 needs to be opened, all connecting bolts 2 are removed, the detection hole cover plate 1 is opened by the strong magnet 19, when the detection hole cover plate 1 rotates to the position where the limiting rod contacts the rudder plate 3, the detection hole cover plate 1 cannot continue to rotate, at this time, the detection hole cover plate 1 is pushed inward, so that the rotating shaft 7 moves inward along the center line of the through hole 18 to the innermost end of the through hole 18, at this time, the opening limiting rod is separated from the rudder plate 3, and the detection hole cover is further rotated outward to the position where the opening limiting rod contacts the inner surface of the rudder plate 3 again, at this time, the detection hole cover plate 1 is completely opened, after the detection hole cover plate 1 is opened to the limit position, the fixing bolt 15 of the telescopic limiting assembly is loosened, and the handle 17 is pushed outward, so that the telescopic rod 14 moves outward until the end of the telescopic rod 14 fully contacts the rudder plate 3, and finally the fixing bolt 15 is locked to complete the limiting operation; at this time, the detection hole cover plate 1 is in a completely open state, and the limiting rod and the telescopic rod 14 can play a double limiting role, so that the detection hole cover plate 1 is in a stable and safe state and cannot be continuously opened or closed, thereby providing convenience and safety guarantee for the related construction in the detection hole.

[0093] When the detection hole cover plate 1 needs to be closed, first, the fixing bolt 15 is loosened, the telescopic rod 14 is moved inward by pushing the handle 17 inward until the handle 17 reaches the upper end of the slot, and the fixing bolt 15 is locked; the detection hole cover is rotated inward, and the rotating shaft 7 is pulled out by the strong magnet 19, until the detection hole cover plate 1 is close to the rudder plate 3 and is approximately parallel, the rotating shaft 7 is pushed inward by the strong magnet 19, so that the inner side of the detection hole cover plate 1 fully contacts the closing limiting block 20; finally, all spring washers are installed, all connecting bolts 2 are installed and tightened, and the closing operation of the detection hole cover plate 1 is completed.

[0094] Exemplarily, before the closing limiting block 20 is welded and fixed with the rudder plate 3, a bevel is formed on the rudder plate 3 at the connection position of the closing limiting block 20, wherein the bevel angle is 45±5°, and the bevel depth is 5mm-10mm.

[0095] Exemplarily, in step S10, the weld joint between the closing limiting block 20 and the rudder plate 3 is ground flat after welding.

[0096] The method for connecting the rudder detection hole cover plate 1 and the rudder plate 3 provided by the present application has the following beneficial effects:

[0097] (1) A flat iron does not need to be lap welded on the inner surface of the rudder plate 3 at the edge of the detection hole, the construction process is simple, there is no problem of angular deformation after welding of the flat iron, the outer surfaces of the cover plate and the rudder plate 3 are not uneven after the cover plate is closed, and the resistance of water flow to ship navigation is avoided from being increased;

[0098] (2) There is no need to weld a ring of flat iron on the edge of the detection hole on the inner surface of the rudder cover plate 3, which will not reduce the effective cross-sectional area of ​​the detection hole when the detection hole cover plate 1 is open, which is beneficial for construction personnel to enter and exit the detection hole.

[0099] (3) No need to make holes or weld ear plates on the test hole cover plate 1, the construction process is simple;

[0100] (4) No welding nuts are required, which reduces construction difficulty and improves construction efficiency;

[0101] (5) The detection hole cover 1 will not completely detach from the rudder blade structure after it is opened. When the detection hole cover 1 is opened, it is not necessary to completely remove the detection hole cover 1 from the rudder blade sealing plate 3 and move it to a safe position. The open detection hole cover 1 can be fixed to the side of the rudder blade by simple rotation and limiting operation. It is easy to operate and has high stability.

[0102] (6) The detection hole cover 1 is opened and closed by a rotating component, which can achieve rapid rotation operation. The operation process is simple, the construction efficiency is high, and the safety is high. Moreover, the opening and closing process of the detection hole cover 1 can be operated by a single person. During the process of loosening the fixing bolt 15, no other person needs to take measures to prevent the detection hole cover 1 from slipping and falling. The process is simple and the operation is safe.

[0103] (7) The rudder blade sealing plate 3 is simulated and pre-installed in advance. The shape deviation and allowance of the rudder blade sealing plate 3 are pre-processed in advance, which effectively reduces the construction difficulty and construction cycle of the rudder blade installation stage and helps to shorten the ship mounting and assembly cycle.

[0104] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0105] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A method for manufacturing a rudder blade inspection hole cover, wherein the inspection hole cover is connected to a rudder blade sealing plate by connecting bolts, wherein multiple connecting bolts are provided and arranged at circumferential intervals along the inspection hole cover, characterized in that, A connecting fixture is provided between the detection hole cover plate and the rudder blade sealing plate. The connecting fixture includes a fixed lug plate, a rotating crank, a rotating shaft, a first limiting rod, and a second limiting rod. There are two fixed lug plates, which are coaxially arranged and fixedly mounted on the rudder blade sealing plate. One end of the rotating crank is rotatably connected to the fixed lug plate through the rotating shaft, and the other end of the rotating crank is fixedly connected to the detection hole cover plate. The first limiting rod and the second limiting rod are both provided on the rotating crank. When the detection hole cover plate is in the fully open state, the first limiting rod abuts against the inner side of the end of the rudder blade sealing plate near the detection hole cover plate, and the second limiting rod abuts against the inner side of the end of the rudder blade sealing plate away from the detection hole cover plate. A first residual hole is provided on the outer periphery of the detection hole cover plate, and a second residual hole is provided on the end of the rudder blade sealing plate near the detection hole cover plate. When the rudder blade sealing plate and the detection hole cover plate are closed, the first residual hole and the second residual hole form a bolt hole for the connecting bolt. The method for manufacturing the rudder blade inspection hole cover plate includes the following steps: Step S1: Draw precise double-sided lines around the entire circle of the detection hole cover plate on the inner and outer surfaces of the rudder blade sealing plate. Step S2: Accurately draw the position of the bolt holes of the connecting bolts on the outer surface contour of the detection hole cover plate according to the drawing requirements. The outer circle contour line of the bolt hole extends outward by 30mm to 50mm, and the contour of the detection hole cover plate passes through the bolt holes. Step S3: Radial scribing and cutting the outline of the detection hole cover plate and the adjacent position of the bolt hole, while maintaining the relative integrity between the rudder blade sealing plate and the detection hole cover plate, to ensure the stability of the relative position between the rudder blade sealing plate and the detection hole cover plate, wherein the cutting direction is perpendicular to the surface of the detection hole cover plate; Step S4: Drill an inner hole from the outer surface of the rudder blade sealing plate to the center line of the bolt hole. The drilling direction of the inner hole is perpendicular to the surface of the rudder blade sealing plate, and the drilling thickness of the inner hole is the same as the plate thickness of the rudder blade sealing plate. Step S5: Drill an outer circular hole from the outer surface of the rudder blade sealing plate to the center line of the bolt hole. The drilling direction of the outer circular hole is perpendicular to the surface of the rudder blade sealing plate. The drilling position of the outer circular hole is concentric with the drilling position of the inner circular hole. The drilling thickness of the outer circular hole is the sum of the thickness of the bolt head of the connecting bolt and the thickness of the spring washer. Step S6: Machin the inner hole with threads and install and tighten all spring washers and connecting bolts; Step S7: Flip the detection hole cover so that the inside faces up. Draw the installation position of the connecting fixture on the inner side of the detection hole cover and the inner side of the rudder blade sealing plate according to the coordinate dimensions of the drawing. Weld the fixing lug to the rudder blade sealing plate and the rotating crank to the detection hole cover. Finally, pass the rotating shaft through the fixing lug and the rotating crank. Step S8: Cut all the remaining uncut areas of the detection hole cover plate, wherein the cutting direction is perpendicular to the surface of the detection hole cover plate; Step S9: After the detection hole cover plate and the rudder blade sealing plate are completely cut apart, use a flat-headed copper hammer or wooden mallet to perform low-energy dense hammering along the contour edge of the detection hole cover plate within a range of 10~20mm, so as to fully release the residual internal stress after the detection hole cover plate is completely cut apart. Then remove the connecting bolts and fully open the detection hole cover plate. Step S10: Weld and install a closing limit block on the inner side of the rudder blade sealing plate. The outer side of the closing limit block is flush with the inner side of the rudder blade sealing plate, and one end of the closing limit block protrudes 5-10mm from the edge of the rudder blade sealing plate toward the detection hole cover. Step S11: Grind and paint the perimeter of the opening of the detection hole cover plate, close the detection hole cover plate, and install and tighten all connecting bolts.

2. The method for manufacturing a rudder blade inspection hole cover plate according to claim 1, characterized in that, The second limiting rod includes a fixed rod, a telescopic rod, and a fixing bolt. The fixed rod is connected to the rotating crank via a connecting rod. The fixed rod is a hollow cylinder, and the telescopic rod is adjustable up and down inside the fixed rod. There are multiple fixing bolts, and the lower end of the fixed rod has multiple through holes through which the fixing bolts can be inserted. The fixing bolts extend into the through holes and abut against the telescopic rod. The connecting rod is fixedly connected to the fixed rod. When the detection hole cover is in the fully open state, the telescopic rod abuts against the rudder blade sealing plate.

3. The method for manufacturing a rudder blade inspection hole cover plate according to claim 2, characterized in that, The telescopic rod has a handle at its upper end, and the fixed rod has a slot that slides with the handle, the slot extending along the length of the fixed rod.

4. The method for manufacturing a rudder blade inspection hole cover plate according to claim 1, characterized in that, Two connecting fixtures are provided, and the two connecting fixtures are arranged at intervals along the height direction of the detection hole cover plate.

5. A method for manufacturing a rudder blade inspection hole cover plate according to claim 1, characterized in that, The fixed ear plate is provided with a through hole through which the rotating shaft can pass, and the through hole is configured as an oblong hole.

6. The method for manufacturing a rudder blade inspection hole cover plate according to claim 1, characterized in that, Before step S1, the following step S0 is also included: cutting the rudder blade cover plate according to the requirements of the unfolded diagram of the rudder blade cover plate.

7. A method for manufacturing a rudder blade inspection hole cover plate according to claim 6, characterized in that, Between steps S0 and S1, the following steps are also included: after the rudder blade body is manufactured, the rudder blade sealing plate is pre-installed on the rudder blade body, the outline position allowance of the rudder blade sealing plate is cut and the welding bevel is opened to ensure that the welding bevel angle and the assembly gap of the rudder blade sealing plate and the adjacent structure meet the relevant design requirements.

8. A method for manufacturing a rudder blade inspection hole cover plate according to claim 1, characterized in that, In step S1, a certain amount of allowance is left for the blanking and cutting of the rudder blade sealing plate. After the blanking and cutting is completed, the shape of the rudder blade sealing plate is processed by mechanical pressing or water-fire bending plate processing.

9. A method for manufacturing a rudder blade inspection hole cover plate according to claim 1, characterized in that, In step S5, the diameter of the outer circular hole is 5mm to 10mm larger than the circumcircle diameter of the bolt head of the connecting bolt.

10. A method for manufacturing a rudder blade inspection hole cover according to claim 1, characterized in that, Before step S7, both the first limiting rod and the second limiting rod are welded onto the rotating crank.

11. A method for manufacturing a rudder blade inspection hole cover according to claim 5, characterized in that, In step S7, the rotating shaft is located at the uppermost end of the through hole.

12. A method for manufacturing a rudder blade inspection hole cover plate according to claim 1, characterized in that, In step S10, before the closing limit block is welded and fixed to the rudder blade sealing plate, a bevel is made at the connection between the rudder blade sealing plate and the closing limit block, wherein the bevel angle is 45±5° and the bevel depth is 5mm~10mm.

13. A method for manufacturing a rudder blade inspection hole cover plate according to claim 1, characterized in that, In step S10, the weld between the closing limit block and the rudder blade sealing plate is ground smooth after welding.

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