CN111017206A - Protection method for helicopter blade - Google Patents
Protection method for helicopter blade Download PDFInfo
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- CN111017206A CN111017206A CN201911364361.3A CN201911364361A CN111017206A CN 111017206 A CN111017206 A CN 111017206A CN 201911364361 A CN201911364361 A CN 201911364361A CN 111017206 A CN111017206 A CN 111017206A
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- protective film
- blade
- polyurethane
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C27/00—Rotorcraft; Rotors peculiar thereto
- B64C27/32—Rotors
- B64C27/46—Blades
- B64C27/473—Constructional features
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
- B64F5/00—Designing, manufacturing, assembling, cleaning, maintaining or repairing aircraft, not otherwise provided for; Handling, transporting, testing or inspecting aircraft components, not otherwise provided for
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- Aviation & Aerospace Engineering (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Transportation (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The invention discloses a protection method of a helicopter blade, which comprises the following steps that a plurality of polyurethane protection films are adopted on the outer surface of one side of an airfoil section of the blade, which is close to a windward side, for sectional film pasting protection; in the wing tip part of the blade, because the special radian of the surface of the wing tip and the speed of the wing tip in the central line of the whole blade are highest, a protective sleeve is manufactured by plastic suction molding according to the shape of the wing tip, and is arranged on the wing tip for protection, so that the windward side and the wing tip part of the whole blade, which are easy to corrode, are fully protected; the invention adopts the sectional type film sticking protection in the airfoil section, improves the durability of the blade under the severe environment, is easy to find when the blade is damaged, can be repaired by a small protective film, reduces the maintenance and replacement time period of the blade, has simple operation and improves the service efficiency of the airplane.
Description
Technical Field
The invention belongs to the field of protection of the surface of an airplane, and particularly relates to a protection method of a helicopter blade.
Background
The military helicopter has unique performance, can effectively implement accurate striking on ground targets and ultra-low-altitude targets, is an important conventional weapon following artillery, tank, airplane and missile, and has irreplaceable status and function in modern war. At present, helicopter rotor blades are mostly designed by adopting full composite materials, and under the sand environment, the blades rotating at a high speed are easy to suffer from the impact of sand so as to cause the front edge of the composite material blade to generate surface pits and large-range internal cracking and layering, thereby causing the reduction of the bearing capacity and influencing the integrity of the composite material structure. The expensive blade is often scrapped or the repairing cost is extremely high, and the use efficiency of the blade is reduced. Therefore, there is an urgent need to devise a method of protecting blades from abrasive erosion, protecting the integrity of their surfaces and improving their durability.
The existing helicopter blade protection methods mainly comprise two methods: one is a double-layer protective coating system composed of zinc yellow epoxy ester primer, strontium yellow epoxy primer, acrylic finish, polyurethane finish and the like; the second is reasonable structure design, which needs sealing and proper sealant, and adopts polysulfide sealant as the joint surface sealant to strengthen protection. Although the existing technical scheme plays a certain role, the military aircraft can further increase the erosion degree under severe environments such as high damp and heat, high salt fog and multi-sand working conditions at high speed, the two technical schemes have insufficient durability, and can rapidly lose efficacy under severe environments, particularly for parts with high linear speed such as a blade tip and the like. In addition, the maintenance and replacement time period of the two schemes is long, the operation is complex, and the use efficiency of the airplane is seriously influenced.
Disclosure of Invention
The invention aims to provide a protection method for a helicopter blade, which improves the durability of the helicopter blade, has short blade maintenance and replacement time period and simple operation, and improves the use efficiency of an airplane.
In order to solve the problems, the technical scheme of the invention is as follows:
a protection method for a helicopter blade comprises the following steps:
protecting the airfoil section of the blade: the outer surface of one side of the wing section close to the windward side is protected by a plurality of polyurethane protective films in a sectional mode;
protection of the tip of the blade: and in the wing tip part, manufacturing a protective sleeve by adopting plastic suction forming according to the shape of the wing tip, and installing the protective sleeve on the wing tip for protection.
Preferably, the airfoil section of the protective blade comprises in particular the following steps:
a1: marking a first protective film installation area, and adhering a shielding adhesive tape on the upper surface of the airfoil section along a direction parallel to the windward side, wherein the area from the windward side to the shielding adhesive tape is the first protective film installation area;
a2: marking a second protective film installation area, and adhering a shielding adhesive tape to the lower surface of the airfoil section along a direction parallel to the windward side, wherein the area from the windward side to the shielding adhesive tape is the second protective film installation area;
a3: cleaning and wiping the first protective film mounting area and the second protective film mounting area, and coating a base coat on the first protective film mounting area and the second protective film mounting area;
a4: adhering the middle connecting area of the pre-cut polyurethane protective film to the windward side of the paddle, and removing release films on the two sides of the middle connecting area;
a5: spraying a wetting liquid on the adhesive surfaces of the two sides of the middle connecting area of the polyurethane protective film, and respectively adhering the two sides of the polyurethane protective film to the first protective film mounting area and the second protective film mounting area;
a6: repeating the steps A1 to A5, and sequentially attaching a plurality of polyurethane protective films from the center to two sides of the airfoil section along the longitudinal direction to protect the films, wherein gaps are reserved between the adjacent polyurethane protective films;
a7: and D, removing the masking adhesive tape adhered in the step A1 and the step A2, filling a sealant into the gap between the polyurethane protective films for sealing, and standing until the sealant is cured.
Preferably, the ratio of the transverse width of the polyurethane protective film adhered to the second protective film mounting region to the transverse width of the polyurethane protective film adhered to the first protective film mounting region is 1: 1 to 3: 4.
Preferably, the step a5 further comprises:
a51: spraying a wetting liquid on the adhesive surfaces on the two sides of the middle connecting area of the polyurethane protective film;
a52: placing one side of the polyurethane protective film on the first protective film mounting area, tensioning the other side of the polyurethane protective film, and scraping and pressing the polyurethane protective film on the first protective film mounting area along the direction from the windward side to the upper surface of the airfoil section by using a scraper;
a53: and putting the other side of the polyurethane protective film into the second protective film mounting area, and scraping and pressing the polyurethane protective film arranged on the second protective film mounting area along the direction from the windward side to the lower surface of the airfoil section by adopting a scraper.
Preferably, the step a7 further comprises:
a71: removing the masking tape adhered in the step A1 and the step A2;
a72: adhering and protecting the edge area of each polyurethane protective film and the peripheral area of each polyurethane protective film by using a shielding adhesive tape, and reserving a gap of 2-4 mm between the shielding adhesive tapes;
a73: filling sealant into the gaps between the shielding adhesive tapes for sealing;
a74: standing until the sealant is cured, and removing the masking tape adhered in the step A72
Preferably, the tip of the protective blade may also be replaced by the following steps:
protection of the tip of the blade: and in the blade production stage, the wing tip protective film is arranged inside the wing tip in a mould pressing and curing mode.
Preferably, the wing tip protection film is made of polyurethane.
Preferably, the thickness of the wing tip protection film is 0.5-0.8 mm.
Preferably, the thickness of the polyurethane protective film is 0.3-0.5 mm.
Based on the same inventive concept, the invention also provides a protection method of the helicopter blade, which comprises the following steps:
protecting the airfoil section of the blade:
the outer surface of one side of the wing section close to the windward side is coated with a whole first polyurethane protective film;
a plurality of second polyurethane protective films are adopted on the first polyurethane protective film for sectional film pasting protection;
protection of the tip of the blade: and in the wing tip part, manufacturing a protective sleeve by adopting plastic suction forming according to the shape of the wing tip, and installing the protective sleeve on the wing tip for protection.
Preferably, the direction perpendicular to the windward side is defined as a transverse direction, and the ratio of the transverse width of the first polyurethane protective film to the transverse width of the second polyurethane protective film is 2: 1-3: 2.
Preferably, the thickness of the first polyurethane protective film is 0.5-0.7 mm, and the thickness of the second polyurethane protective film is 0.3-0.5 mm.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects:
1) the invention provides a protection method of a helicopter blade, which comprises the following steps that a plurality of polyurethane protection films are adopted on the outer surface of one side of an airfoil section of the blade, which is close to a windward side, for sectional film pasting protection; in the wing tip part of the blade, because the special radian of the surface of the wing tip and the speed of the wing tip in the central line of the whole blade are highest, a protective sleeve is manufactured by plastic suction molding according to the shape of the wing tip, and is arranged on the wing tip for protection, so that the windward side and the wing tip part of the whole blade, which are easy to corrode, are fully protected; the invention adopts the sectional type film sticking protection in the airfoil section, improves the durability of the blade under the severe environment, is easy to find when the blade is damaged, can be repaired by a small protective film, reduces the maintenance and replacement time period of the blade, has simple operation and improves the service efficiency of the airplane.
Drawings
FIG. 1 is a block diagram of a helicopter blade according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method of protecting a helicopter blade in accordance with an embodiment of the present invention;
FIG. 3 is a schematic illustration of the protection of an airfoil section of a helicopter blade in accordance with an embodiment of the present invention;
FIG. 4 is a cross-sectional view of an airfoil section of the helicopter blade of FIG. 3;
FIG. 5 is a flow diagram of the airfoil section of the protective blade of FIG. 1;
FIG. 6 is a flowchart of step A5 of FIG. 5;
FIG. 7 is a flowchart of step A7 of FIG. 5;
FIG. 8 is a flow chart of a method of protecting a helicopter blade in accordance with an embodiment of the present invention;
FIG. 9 is a schematic illustration of the protection of an airfoil section of a helicopter blade according to an embodiment of the present invention.
Description of reference numerals:
1: an airfoil section; 11: the windward side; 12: an upper surface of the airfoil section; 13: a lower surface of the airfoil section; 2: a wingtip portion; 3: a polyurethane protective film; 4: a first polyurethane protective film; 5: a second polyurethane protective film.
Detailed Description
The protection method for a helicopter blade according to the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims.
Referring to fig. 1, a blade of a helicopter comprises an airfoil section 1 and a wing tip 2, and during the flight of the helicopter, the windward side and the wing tip 2 on the airfoil section 1 are the most susceptible to corrosion, so when the blade is protected, the windward side and the wing tip 2 on the airfoil section 1 of the blade are mainly protected.
Example one
In the present embodiment, the blade is a composite material blade, and referring to fig. 2, the present embodiment provides a protection method for a helicopter blade, including the following steps of protecting an airfoil section 1 of the blade: the outer surface of one side, close to the windward side, of the airfoil section 1 is protected by a plurality of polyurethane protective films 3 in a sectional mode, and the thickness of each polyurethane protective film 3 is 0.3-0.5 mm; protecting the tip 2 of the blade: and in the wing tip part, manufacturing a protective sleeve by adopting plastic suction forming according to the shape of the wing tip, and installing the protective sleeve on the wing tip for protection.
For the composite material blade, as the composite material has corrosion resistance, only a layer of polyurethane protective film needs to be installed on the composite material blade, in the embodiment, the airfoil section is installed in a blocking mode, and when a helicopter executes a task and a certain area is worn or corroded, the helicopter can be replaced immediately, the durability of the blade in a severe environment is improved, the maintenance and replacement time period of the blade is shortened, the operation is simple, and the use efficiency of an airplane is improved.
Referring to fig. 3 to 4, in the present embodiment, the airfoil section 1 includes a windward side 11, an upper surface 12 of the airfoil section, and a lower surface 13 of the airfoil section, the windward side 11 is a windward side 11 on the airfoil section 1, and since the windward side 11 is susceptible to corrosion, it is necessary to protect the windward side 11, as shown in fig. 5, in the present embodiment, the specific steps of protecting the airfoil section 1 of the blade are as follows:
a1: marking a first protective film installation area, adhering a shielding adhesive tape on the upper surface 12 of the airfoil section along a direction parallel to the windward surface 11, wherein the area from the windward surface 11 to the shielding adhesive tape is the first protective film installation area, and in the embodiment, the distance from the shielding adhesive tape to the windward surface 11 on the upper surface 12 of the airfoil section is 12 cm;
a2: marking a second protective film installation area, and adhering a shielding adhesive tape to the lower surface 13 of the airfoil section along a direction parallel to the windward side 11, wherein the area from the windward side 11 to the shielding adhesive tape is the second protective film installation area, and in the embodiment, the distance from the shielding adhesive tape to the windward side 11 on the lower surface 13 of the airfoil section is 8 cm;
a3: cleaning and wiping the first protective film mounting area, the second protective film mounting area and the windward side, coating a base coat on the first protective film mounting area, the second protective film mounting area and the windward side, standing for 10 minutes, and drying the base coat;
a4: adhering a middle connecting area of a pre-cut polyurethane protective film 3 with the thickness of 20cm multiplied by 10cm to the windward side 11 of the paddle, enabling the long edge of the polyurethane protective film 3 to be vertical to the windward side 11, and removing release films on two sides of the middle connecting area;
a5: spraying a wetting liquid on the adhesive surfaces of the two sides of the middle connection region of the polyurethane protective film 3, and respectively adhering the two sides of the polyurethane protective film 3 to the first protective film mounting region and the second protective film mounting region. Referring to fig. 6, in the present embodiment, the protective film wetting liquid is uniformly sprayed on the adhesive surface of the polyurethane protective film 3 using a spray bottle, then the polyurethane protective film 3 at the upper end is placed in the first protective film mounting area, the polyurethane protective film 3 at the lower end is tensioned by one hand, the other hand scrapes and presses the upper surface 12 of the wing-shaped section slowly from the windward side by a scraper blade, the polyurethane protective film 3 is adhered to the upper surface 12 of the wing-shaped section, the wetting liquid is scraped off, no bubble is ensured between the polyurethane protective film 3 and the upper surface 12 of the wing-shaped section, if the bubble which can not be scraped off exists, the polyurethane protective film 3 is uncovered, and the bubble is released, the polyurethane protective film 3 is scraped and pressed onto the upper surface 12 of the airfoil section again by a scraper, and finally the polyurethane protective film 3 is ensured not to wrinkle, and no air bubbles exist between the polyurethane protective film 3 and the upper surface 12 of the airfoil section; the lower end of the polyurethane protective film is then scraped against the lower surface 13 of the airfoil section using the same method. In the embodiment, a gap of about 5cm is reserved between the attached polyurethane protective film 3 and the masking tape, so that sealant can be conveniently filled in the subsequent process; referring to fig. 4, with the windward side 11 as the center, for different helicopter models, the blade design mode and the regional environment of the service area are different, the distances (X, Y) from the installation edge of the polyurethane protective film 3 of the upper surface 12 of the airfoil section and the lower surface 13 of the airfoil section to the center line of the windward side 11 are different, generally the upper surface is larger than the lower surface, and the ratio of the distance from the lower surface to the center line of the windward side to the distance from the upper surface to the center line of the windward side is 1: 1-3: 4.
A6: repeating the steps A1 to A5, and pasting and protecting a plurality of polyurethane protective films 3 from the center of the wing-shaped section to the mounting sequence of the two sides along the longitudinal direction, wherein gaps are reserved between the adjacent polyurethane protective films 3, so that sealant can be conveniently filled in the subsequent process;
a7: and D, removing the masking adhesive tape adhered in the step A1 and the step A2, filling the sealant into the gap between the polyurethane protective films 3 for sealing, and standing until the sealant is cured. Referring to fig. 7, in this embodiment, the masking tapes adhered in steps a1 and a2 are removed, then the masking tapes are used again to adhere and protect the edge regions of the polyurethane protective films 3 and the peripheral regions of the polyurethane protective films 3, and gaps of 2-4 mm are reserved between the masking tapes, in this embodiment, gaps of 3mm are reserved between the masking tapes, then the gaps are filled with a sealant having a color consistent with that of the machine body for sealing, the rubber glove on the tape is used for smoothing the sealant with fingers, and finally the masking tapes are left for thirty minutes, after the sealant is cured, the masking tapes are removed, and the installation is completed.
Because the radian of the wing tip part is special, the angular velocity of the wing tip is highest, and the wing tip is extremely easy to corrode, the wing tip part 2 of the blade needs to be protected, and in the embodiment, two protection modes can be adopted for the wing tip part 2; the first adopts the plastic uptake shaping to obtain the protective sheath according to the shape of wingtip portion 2 to with protective sheath direct mount on the wingtip, when the installation, can use the adhesive to handle wingtip portion 2 earlier, improve the adhesive strength after the adhesion. The specific steps of plastic uptake molding are as follows: determining the protection area of the wingtip part 2, scanning and positioning in 3D to obtain a digital model, opening a mold, forming by plastic suction molding, and positioning and installing.
In this embodiment, the tip portion 2 of the blade may be replaced by a protective film made of polyurethane and having a thickness of 0.5-0.8 mm, and the protective film is mounted inside the tip by mold pressing and curing in the blade production stage.
The concrete steps of mould pressing and curing are as follows: 1. cleaning the die: removing the residual resin and sundries in the last use and keeping the mould clean and smooth; 2. preheating a mould: carrying out heat treatment on the die; 3. coating a release agent: coating a certain amount of release agent in the groove of the mold to prevent the formed product from being stuck with the mold after preheating; 4. preparing materials: stacking raw materials (a carbon fiber layer, a TPU film protective film layer and a glass fiber layer) layer by layer, and meanwhile, prepressing the stacked materials to form a compact body with regular shape and certain quality; 5. entering a mold: placing the stacked raw materials into a mold, simultaneously placing a plastic air bag into the mold, closing the mold, placing the whole into a mold closing machine, applying certain constant pressure to the plastic air bag inside, and setting constant temperature and time to cure the plastic air bag; 6. cooling and demolding: cooling the mold after hot pressing for a period of time, then uncovering the mold, and demoulding; 7. and (3) processing and forming: the product after the drawing of patterns needs to be cleared up to blow clean with compressed air, polish the shaping product, make the surface smooth clean and tidy.
The embodiment is mainly designed for large helicopters, and for unmanned helicopters, because the paddle is smaller, the mode that the paddle wraps up can also be adopted for installation, and the protective effect is better.
Example two
In the present embodiment, the blade is made of a metal material, and since metal is prone to corrosion, as shown in fig. 8 to 9, a double-layer protection design is adopted for the airfoil section 1 in the present embodiment, and as shown in fig. 8, based on the same inventive concept, the present embodiment further provides a protection method for a helicopter blade, including the following steps:
protection of the airfoil section 1 of the blade: firstly, coating the outer surface of one side, close to the windward side, of the airfoil section 1 by using a whole first polyurethane protective film 4, wherein the thickness of the first polyurethane protective film 4 is 0.5-0.7 mm, and the first polyurethane protective film 4 is close to a blade substrate and is mainly used for isolating air, water vapor and other corrosive substances and better protecting the metal blade substrate; then, a plurality of second polyurethane protective films 5 are adopted on the first polyurethane protective film 4 for sectional type film pasting protection, and the film pasting method and the embodiment of the step are consistent, so that the description is not repeated herein, the thickness of the second polyurethane protective film 5 is 0.3-0.5 mm, the second polyurethane protective film 5 is used as a protective layer which is directly contacted with a corrosive medium, and the second polyurethane protective film is installed in a block manner with the length of 25-30 side surfaces and the width of 10-12 cm, and the design is that when a helicopter executes a task, a certain area is worn and corroded, and can be immediately replaced; referring to FIG. 9, in the present embodiment, the first polyurethane protective film 4 is wider than the second polyurethane protective film 5, and the ratio is generally 2: 1 to 3: 2.
Protection of the tip of the blade: the protective sleeve is manufactured on the wing tip part by adopting the plastic suction forming according to the shape of the wing tip, and is arranged on the wing tip for protection, and the plastic suction forming protection method of the wing tip part is consistent with the embodiment, so the description is not repeated.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is still within the scope of the present invention if they fall within the scope of the claims of the present invention and their equivalents.
Claims (12)
1. A protection method for a helicopter blade is characterized by comprising the following steps:
protecting the airfoil section of the blade: the outer surface of one side of the wing section close to the windward side is protected by a plurality of polyurethane protective films in a sectional mode;
protection of the tip of the blade: and in the wing tip part, manufacturing a protective sleeve by adopting plastic suction forming according to the shape of the wing tip, and installing the protective sleeve on the wing tip for protection.
2. A method of protecting a helicopter blade according to claim 1 wherein said airfoil section of said protecting blade specifically comprises the steps of:
a1: marking a first protective film installation area, and adhering a shielding adhesive tape on the upper surface of the airfoil section along a direction parallel to the windward side, wherein the area from the windward side to the shielding adhesive tape is the first protective film installation area;
a2: marking a second protective film installation area, and adhering a shielding adhesive tape to the lower surface of the airfoil section along a direction parallel to the windward side, wherein the area from the windward side to the shielding adhesive tape is the second protective film installation area;
a3: cleaning and wiping the first protective film mounting area and the second protective film mounting area, and coating a base coat on the first protective film mounting area and the second protective film mounting area;
a4: adhering the middle connecting area of the pre-cut polyurethane protective film to the windward side of the paddle, and removing release films on the two sides of the middle connecting area;
a5: spraying a wetting liquid on the adhesive surfaces of the two sides of the middle connecting area of the polyurethane protective film, and respectively adhering the two sides of the polyurethane protective film to the first protective film mounting area and the second protective film mounting area;
a6: repeating the steps A1 to A5, and sequentially attaching a plurality of polyurethane protective films from the center to two sides of the airfoil section along the longitudinal direction to protect the films, wherein gaps are reserved between the adjacent polyurethane protective films;
a7: and D, removing the masking adhesive tape adhered in the step A1 and the step A2, filling a sealant into the gap between the polyurethane protective films for sealing, and standing until the sealant is cured.
3. A method of shielding a helicopter blade according to claim 2 wherein the ratio of the transverse width of said polyurethane protective film adhered to said second protective film mounting area to the transverse width of said polyurethane protective film adhered to said first protective film mounting area is 1: 1-3: 4.
4. a method of protecting a helicopter blade according to claim 2 wherein said step a5 further comprises:
a51: spraying a wetting liquid on the adhesive surfaces on the two sides of the middle connecting area of the polyurethane protective film;
a52: placing one side of the polyurethane protective film on the first protective film mounting area, tensioning the other side of the polyurethane protective film, and scraping and pressing the polyurethane protective film on the first protective film mounting area along the direction from the windward side to the upper surface of the airfoil section by using a scraper;
a53: and putting the other side of the polyurethane protective film into the second protective film mounting area, and scraping and pressing the polyurethane protective film arranged on the second protective film mounting area along the direction from the windward side to the lower surface of the airfoil section by adopting a scraper.
5. A method of protecting a helicopter blade according to claim 2 wherein said step a7 further comprises:
a71: removing the masking tape adhered in the step A1 and the step A2;
a72: adhering and protecting the edge area of each polyurethane protective film and the peripheral area of each polyurethane protective film by using a shielding adhesive tape, and reserving a gap of 2-4 mm between the shielding adhesive tapes;
a73: filling sealant into the gaps between the shielding adhesive tapes for sealing;
a74: standing until the sealant is cured, and removing the masking tape adhered in the step A72.
6. A method of protecting a helicopter blade according to claim 1 wherein the tip of said protecting blade is replaced by the steps of:
protection of the tip of the blade: and in the blade production stage, the wing tip protective film is arranged inside the wing tip in a mould pressing and curing mode.
7. A method of protecting a helicopter blade according to claim 6 wherein said tip protector film is polyurethane.
8. A method of protecting a helicopter blade according to claim 7 wherein said tip protector film has a thickness of from 0.5 to 0.8 mm.
9. A method of protecting a helicopter blade according to claim 1 wherein said polyurethane protective film has a thickness of from 0.3 to 0.5 mm.
10. A protection method for a helicopter blade is characterized by comprising the following steps:
protecting the airfoil section of the blade:
the outer surface of one side of the wing section close to the windward side is coated with a whole first polyurethane protective film;
a plurality of second polyurethane protective films are adopted on the first polyurethane protective film for sectional film pasting protection;
protection of the tip of the blade: and in the wing tip part, manufacturing a protective sleeve by adopting plastic suction forming according to the shape of the wing tip, and installing the protective sleeve on the wing tip for protection.
11. A method of protecting a helicopter blade according to claim 10 wherein, defining the direction perpendicular to the windward side as the transverse direction, the ratio of the transverse width of said first polyurethane protective film to the transverse width of said second polyurethane protective film is 2: 1-3: 2.
12. a method of protecting a helicopter blade according to claim 10 wherein said first polyurethane protective film has a thickness of from 0.5 to 0.7mm and said second polyurethane protective film has a thickness of from 0.3 to 0.5 mm.
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| CN201911364361.3A CN111017206A (en) | 2019-12-23 | 2019-12-23 | Protection method for helicopter blade |
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| CN201911364361.3A CN111017206A (en) | 2019-12-23 | 2019-12-23 | Protection method for helicopter blade |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112407328A (en) * | 2020-11-20 | 2021-02-26 | 中国直升机设计研究所 | Method for evaluating rain erosion resistance of helicopter rotor blade protective material |
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Application publication date: 20200417 |