Helicopter speed reducer case broken hole war injury emergency repair method

Abstract

The application provides a helicopter speed reducer case broken hole battle injury emergency repair method, which comprises the following steps: step one, damage site filing; step two, speed reducer impurity removal; step three, blocking the inner broken hole, reinforcing the broken hole strength, using a metal mesh to cover the broken hole of the speed reducer, and setting a blocking pad on the metal mesh, which can block the inner broken hole and cannot block the broken hole sidewall; step four, repairing the broken hole, using an adhesive to bond the broken hole; and step five, curing the adhesive, and polishing the protruding adhesive after the curing is completed. The application can be used for the emergency repair of larger broken holes, can restore most of the strength of the damaged site, and the adhesive has a large contact area with the sidewall of the case broken hole, has large compression and tensile load capacity, can effectively avoid the lubricating oil leakage caused by the cracking of the bonding site during use, has a long service time after the emergency repair, can be used in the high stress area of the speed reducer case, and ensures the flight safety of the helicopter.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of helicopter reducer casing broken hole battle damage repair equipment, in particular to a helicopter reducer casing broken hole battle damage repair method. BACKGROUND

[0002] At present, most helicopters use a single rotor plus tail rotor to achieve flight balance and heading control, and the engine and the rotor tail rotor need to be reduced in speed and reversed by a reducer, and then connected by a transmission shaft to rotate the aerodynamic rotor and tail rotor.

[0003] The main reducer, intermediate reducer and tail reducer in the transmission system are relatively large in size and are mostly aluminum-magnesium alloy castings, which are prone to broken holes and cracks under random weapon attacks. For helicopters that can still make an emergency landing in the wild or return safely, the damage to the reducer should not have caused serious damage to the gear transmission mechanism inside the reducer, so the main problem is oil leakage caused by damaged casings, which still has the possibility of repair.

[0004] The existing repair method mainly uses sealant to solve the leakage of lubricating oil in the reducer, but it cannot restore the strength of the reducer casing, cannot be used for repair of larger damage, and cannot be used in high stress areas, resulting in only a part of the damaged reducer can be repaired. Moreover, the sealant used in the existing repair method may crack under the vibration of the reducer gear transmission mechanism after repair, causing the reducer to leak oil during flight, which cannot cool the gear transmission mechanism inside the reducer and carry away the debris of wear and tear, affecting the safety of the helicopter flight. SUMMARY

[0005] Therefore, the present application provides a helicopter reducer casing broken hole battle damage repair method, which can be used for repair of larger broken holes, can restore most of the strength of the damaged part, and the contact area between the adhesive and the broken hole side wall of the casing is large, the compression and tensile load capacity is large, and the leakage of lubricating oil caused by the cracking of the bonded part during use can be effectively avoided. The repaired reducer casing can be used for a long time, can be used in high stress areas of the reducer casing, and can ensure the safety of the helicopter flight.

[0006] To solve the above technical problems, the present application provides a helicopter reducer casing broken hole battle damage repair method, comprising the following steps:

[0007] Step one, damage site filing, identifying and marking the damage site, using a red marker to mark the damage site, and using tools to file the side wall of the damage site to remove sharp corners and burrs;

[0008] Step two, remove impurities from the reducer casing, drain the lubricating oil in the reducer casing, and remove impurities inside the reducer casing;

[0009] Step three, blocking the inner broken hole and reinforcing the strength of the broken hole, covering the broken hole of the speed reducer with a metal mesh, and setting a blocking pad on the metal mesh which can block the inner broken hole and not block the side wall of the broken hole, so as to increase the strength of the repaired damaged part and prevent too much adhesive from entering the inside of the speed reducer case and affecting the operation of the gear mechanism;

[0010] Step four, repairing the broken hole, filling the broken hole with adhesive;

[0011] Step five, curing the adhesive, using auxiliary heating equipment to warm the adhesive to speed up the curing, and polishing the protruding adhesive after curing is completed;

[0012] The tool in step one is a file, which is an electric file or a pneumatic file.

[0013] In step two, a high-power vacuum cleaner and compressed air blowing can be used to clean the impurities in the speed reducer case, which can avoid the influence of residual impurities in the speed reducer on the service life of the speed reducer.

[0014] The blocking pad in step three is aluminum foil or plastic, which can prevent the adhesive from entering the inside of the speed reducer case.

[0015] The adhesive in step four is high-strength cast aluminum alloy adhesive TS113.

[0016] The auxiliary heating equipment in step five is a baking lamp, which is used to warm the adhesive to make it cure quickly, and a temperature measuring gun is used to measure the temperature of the adhesive. The temperature measuring gun is a digital temperature measuring gun with electronic display in the prior art. The operator uses one hand to warm the adhesive with the auxiliary heating equipment to make it cure quickly, and uses the other hand to measure the temperature of the adhesive with the temperature measuring gun to ensure that the adhesive is in the best curing temperature range. For example, the best curing temperature of high-strength cast aluminum alloy adhesive TS113 is 80-200°C, which can obtain the best coating performance and the most satisfactory curing effect. Of course, other adhesives that meet the requirements can also be selected, and the best curing temperature of the adhesive at this time is selected according to the curing characteristics of the material itself.

[0017] In step five, the protruding adhesive is polished with a file, which can ensure that the outer surface of the speed reducer case is smooth and beautiful.

[0018] In step two and step three, a rough surface with grooves and protrusions is formed on the side wall of the broken hole by broaching before step three and step four. In step three and step four, the metal mesh is pressed to fit the tooth-shaped groove with the extrusion assembly, which can increase the tensile strength of the metal mesh. Then the extrusion assembly is removed, and finally the procedures of step four and step five are repeated.

[0019] The extrusion assembly comprises a pair of limiting plates matched with the minimum diameter of the broken hole, an air guide pipe is arranged on the axis of the limiting plate, the air guide pipe penetrates the limiting plate on the outer side, and the bottom of the air guide pipe is fixed on the limiting plate on the inner side, an air bag is arranged between the two limiting plates and communicates with the air guide pipe, and a sealing plug is arranged on the outer side of the air guide pipe and used for sealing the air guide pipe.

[0020] Compared with the prior art, the application has at least one of the following beneficial technical effects:

[0021] 1、The high-strength cast aluminum alloy repair adhesive is used, the adhesive fully contacts the side wall of the broken hole after polishing, most of the strength of the damaged part can be restored, the contact area of the adhesive and the side wall of the broken hole is large, the compression and tensile load capacity is large, it can be used for repairing large broken holes, the high-strength cast aluminum alloy adhesive is used instead of a sealant, the strength of the broken hole of the speed reducer housing can be effectively restored, and not only the sealing performance.

[0022] 2、The repair method can be used for the high-stress area of the speed reducer housing, and can effectively avoid the lubricating oil leakage caused by the cracking of the bonding part during use, and can be used for a long time after repair.

[0023] 3、The metal mesh in the application only supports and cooperates with the aluminum foil to block the broken hole close to the inner side of the housing to prevent excessive adhesive from flowing into the interior of the speed reducer housing and bonding or colliding with the gear transmission mechanism.

[0024] 4、The metal mesh and the aluminum foil are used to block the broken hole close to the inner side of the housing to prevent excessive adhesive from entering the interior of the housing and bonding the gear transmission mechanism.

[0025] 5、The tooth-shaped groove is formed on the side wall of the broken hole by using the broaching tool, the air bag is placed in the broken hole, the air bag is inflated to top the metal mesh to be fitted with the tooth-shaped groove, the air bag is deflated and taken out, then the adhesive is used to bond the broken hole, the auxiliary heating equipment is used to warm the adhesive to accelerate solidification, and the protruding adhesive is polished after solidification, so that the adhesion of the metal mesh is increased, most of the strength of the damaged part can be restored, a large compression and tensile load can be borne, it is suitable for repairing large broken holes, and it is more convenient and firm. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a structure diagram of the metal mesh installation in the helicopter speed reducer housing broken hole battle damage repair method of the application;

[0027] Figure 2 It is a structure diagram of the metal mesh and the protective pad installation in the helicopter speed reducer housing broken hole battle damage repair method of the application;

[0028] Figure 3 It is the structure schematic diagram of the adhesive bonding in the helicopter reducer casing broken hole war injury emergency repair method in the application;

[0029] Figure 4 It is the structure schematic diagram of the adhesive bonding and polishing in the helicopter reducer casing broken hole war injury emergency repair method in the application;

[0030] Figure 5 It is the structure schematic diagram of the extrusion assembly in the helicopter reducer casing broken hole war injury emergency repair method in the application.

[0031] The label explanation: 100, the reducer casing; 200, extrusion assembly; 201, limit board; 202, gas guide pipe; 203, inflatable bag; 204, sealing plug; 300, metal net; 400, protective pad; 500, adhesive. Specific embodiments

[0032] To make the purpose, technical scheme and advantages of the embodiments of the application more clear, the following will combine the drawings of the embodiments of the application and specifically describe the technical scheme of the embodiments of the application. Figures 1-5 The technical scheme of the embodiments of the application is described clearly and completely. Obviously, the described embodiments are part of the embodiments of the application, not all. Based on the described embodiments of the application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the application.

[0033] As Figures 1-4 shown: the embodiment provides a helicopter reducer casing broken hole war injury emergency repair method, including the following steps:

[0034] Step one, damage site filing, confirming and identifying damage site, can use red marker to identify damage site, use tools to file the side wall of damage site, remove sharp corners burrs, tools are files, files are electric files or pneumatic files;

[0035] Step two, reducer casing 100 impurity removal, put off the lubricating oil in the reducer casing 100, remove the impurities in the reducer casing 100, can use the high-power dust collector in the prior art to suck and compressed air to blow two ways to clean the impurities in the reducer, which can avoid the influence of the residual impurities in the reducer casing 100 on the service life of the reducer;

[0036] Step three, block the inner broken hole, reinforce the strength of the broken hole, cover the broken hole of the speed reducer with the metal mesh 300, the specific implementation manner is that the metal mesh 300 is manually folded into a shape same as the depth of the broken hole and matched with the inner side wall of the broken hole, then the metal mesh 300 is placed in the broken hole of the speed reducer case 100, and then the blocking pad capable of blocking the inner broken hole and not blocking the side wall of the broken hole is placed at the bottom of the recess inner side wall of the metal mesh 300, the blocking pad is an aluminum foil or plastic, of course, in order to increase the tightness of the blocking pad matched with the metal mesh 300, the blocking pad can be bonded in the recess of the metal mesh 300, so that the strength of the repaired damaged part can be increased, and the adhesive 500 can be prevented from entering the inside of the housing of the speed reducer case 100;

[0037] Step four, repairing the broken hole, the adhesive 500 is used to bond the broken hole, the adhesive 500 is a high-strength cast aluminum alloy adhesive 500TS113, and the adhesive 500 is manually extruded into the broken hole by means of the glue gun equipment in the prior art;

[0038] Step five, curing the adhesive 500, the adhesive 500 is heated by using an auxiliary heating device to accelerate curing, and the protruding adhesive 500 is polished after curing, the protruding adhesive 500 can be polished by using a file, so that the outer surface of the speed reducer case 100 is smooth and beautiful;

[0039] The auxiliary heating device in step five is a baking lamp, which is used to heat the adhesive 500 to make it quickly cure, and a temperature measuring gun is used to measure the temperature of the adhesive 500, the temperature measuring gun is a digital temperature measuring gun with an electronic display in the prior art, one hand of the operator holds the auxiliary heating device to heat the adhesive 500 to make it quickly cure, and the other hand holds the temperature measuring gun to measure the temperature of the adhesive 500, so that the adhesive 500 is in the best curing temperature range, for example, the best curing temperature of the high-strength cast aluminum alloy adhesive 500TS113 is 80-200 DEG C, at this time, the best coating performance can be obtained, and the most satisfactory ablation effect can be obtained, of course, other adhesives 500 meeting the requirements can also be selected, at this time, the best curing temperature of the adhesive 500 is selected according to the curing characteristics of the material itself.

[0040] According to another embodiment of the present application, as Figure 5As shown, the uneven surface with grooves and protrusions is formed on the side wall of the broken hole by using the broaching process between step two and step three, the broaching process can use an electric or pneumatic broaching tool to form the uneven surface, the protruding part of the uneven surface should be smooth without sharp corners, so as to avoid the sharp corners of the protrusions breaking the metal mesh, causing the overall strength of the metal mesh to be attenuated, and then weakening the overall strength of the damaged part after repair, between step three and step four, the metal mesh 300 is pressed to fit the tooth-shaped groove by using the extrusion assembly 200, so as to increase the tensile strength of the metal mesh 300, then the extrusion assembly 200 is taken out, finally the processes of step four and step five are repeated, the extrusion assembly 200 includes a pair of limiting plates 201 matched with the minimum diameter of the broken hole, the limiting plate 201 is provided with a gas guide pipe 202 on the axis, the gas guide pipe 202 penetrates the outer limiting plate 201, and the bottom of the gas guide pipe 202 is fixed on the inner limiting plate 201, a gas-filled bag 203 is arranged between the two limiting plates 201 and communicates with the gas guide pipe 202, a sealing plug 204 is arranged outside the gas guide pipe 202, the sealing plug 204 is used for sealing the gas guide pipe 202, after the metal mesh 300 is shaped, the gas-filled bag 203 is deflated, the extrusion assembly 200 is taken out, finally the processes of step five and step six are repeated, since the metal mesh 300 has a certain tensile strength and deformation capacity, the inflation of the gas-filled bag 203 can realize the pressing of the metal mesh 300 to tightly fit the tooth-shaped groove, then the adhesive 500 is injected, the metal mesh 300 not only increases the firmness of the bonding, can restore most of the strength of the damaged part, but also increases the compression and tensile load capacity of the metal mesh 300 by cooperating with the tooth-shaped groove and the biting action of the deformed metal mesh 300, which is suitable for repairing larger broken holes, and is more convenient and firm.

[0041] The above describes the preferred embodiments of the present application, it should be noted that for ordinary skilled in the art, without departing from the principles of the present application, can make several improvements and refinements, these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A method of repairing a battle damage of a helicopter reduction gear case, characterized in that, It comprises the following steps: Step one, the damaged part is filed, the damaged part is identified and marked, and the side wall of the damaged part is filed using a tool to remove sharp corners and burrs; Step two, remove impurities from the reducer housing (100), remove the lubricating oil in the reducer housing (100), and remove the impurities and debris inside the reducer housing (100); Step three, block the inner broken hole and reinforce the broken hole strength, cover the broken hole of the reducer housing (100) with a metal mesh (300), and set a blocking pad on the metal mesh (300) that can block the inner broken hole and not block the broken hole side wall; Step four, repair the broken hole, and fill the broken hole with adhesive (500); Step five, solidify the adhesive (500), use auxiliary heating equipment to warm the adhesive (500) to speed up solidification, and polish the protruding adhesive (500) after solidification is completed; Between step two and step three, an uneven surface with grooves and protrusions is formed on the side wall of the broken hole by broaching, the metal mesh (300) is pressed to fit the tooth-shaped groove with the extrusion assembly (200) between step three and step four, then the extrusion assembly (200) is removed, and finally the procedures of step four and step five are repeated; 2. The method of claim 1, wherein: The tool in step one is a file.

3. The method of claim 1, wherein: In step two, a high-power vacuum cleaner and compressed air blowing are used in combination to clean the impurities and debris inside the reducer.

4. The method of claim 1, wherein: The blocking pad in step three is aluminum foil or plastic.

5. The method of claim 1, wherein: The adhesive (500) in step four is a high-strength cast aluminum alloy adhesive TS113.

6. The method of claim 1, wherein: The auxiliary heating equipment in step five is a baking lamp.

7. The method of claim 6, wherein: In step five, a file is used to polish the protruding adhesive (500).

8. The method of claim 1, wherein: The extrusion assembly (200) includes a pair of limit plates (201) adapted to the smallest diameter of the broken hole, the limit plates (201) are provided with air guide tubes (202) on the axis, the two limit plates (201) are provided with air-filled bags (203) connected with the air guide tubes (202), and the outer side of the air guide tubes (202) is provided with sealing plugs (204).

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