A kind of tool and method for replacing crack fault of helicopter center reducer joint

Abstract

The present invention belongs to the technical field of drilling positioning, and in particular, relates to a tool and method for replacing crack faults in helicopter center reduction joints, comprising a drilling jig mechanism installed on a positioning platform, the drilling jig mechanism comprising a mounting plate, a pressing plate and a drilling jig, the mounting plate being provided with a plurality of stepped holes, the pressing plate being provided with guide holes corresponding to the stepped holes one by one; an elastic rubber pad being provided on the stepped end surface of the stepped hole, the inner support sleeve of the elastic rubber pad being provided with a drilling jig, the outer diameter of the drilling jig being smaller than the inner diameter of the stepped hole and larger than the inner diameter of the guide hole. The tool can be used to position the replaced old center reduction joint, and to accurately configure the positioning holes of the new part.

Description

Technical Field

[0001] The invention belongs to the technical field of drilling positioning, and in particular relates to a tool and method for replacing crack faults in a helicopter mid-reducing joint. Background Art

[0002] The intermediate reducer joint is installed at the corner of the helicopter's tail beam and oblique beam. It is used to fix the intermediate reducer. The front end of the reducer is the input end, and the rear end is the output end. The front and rear ends are respectively connected to the transmission shaft to drive the tail reducer.

[0003] During the repair process, cracks were found in the center reducer joint, which may cause the coaxiality of the transmission shaft to exceed the tolerance in severe cases, affecting flight safety. In response to this fault, the center reducer joint crack fault part was replaced, which is the first time in China and there is no corresponding technical data. Since the center reducer joint positioning and mounting holes are made by manual marking during assembly, the interchangeability is poor, and there are no mounting holes on the new part. The positioning holes and mounting holes of the new part need to be manufactured according to the special tooling developed. Due to the high positioning accuracy requirements of the mounting holes of the center reducer joint, ordinary replacement tooling cannot meet the requirements of accurate matching of mounting holes.

[0004] Objective disadvantages of the prior art: There is currently no corresponding replacement tooling to clamp and locate the position of the installation holes of the cracked faulty parts of the replaced center reducer joint, and to accurately configure the positioning holes of the new parts. Summary of the invention

[0005] In view of the technical problems existing in the background technology, the present invention provides a tool for replacing crack faults in helicopter center reducer joints, which is used to position the replaced old parts and accurately configure the positioning holes of the new parts.

[0006] To achieve the above purpose, the technical solution provided by the present invention is:

[0007] A tool for replacing crack faults in helicopter center reducer joints, comprising a drilling jig mechanism installed on a positioning platform, the drilling jig mechanism comprising a mounting plate, a pressing plate and a drilling jig, the mounting plate being provided with a plurality of stepped holes, the pressing plate being provided with guide holes corresponding one to one with the stepped holes; an elastic rubber pad being provided on the stepped end surface of the stepped hole, the inner support sleeve of the elastic rubber pad being provided with a drilling jig, the outer diameter of the drilling jig being smaller than the inner diameter of the stepped hole and larger than the inner diameter of the guide hole.

[0008] Optionally, the center reduction joint includes a plurality of positioning holes located in the center and a plurality of mounting holes located on the sides; the positions of the stepped holes and the mounting holes correspond one to one; a side plate corresponding to the center reduction joint is extended on one side of the positioning platform, a positioning pin is provided on the positioning platform, the center reduction joint is fixed on the positioning pin through the positioning hole, the side of the center reduction joint is arranged tightly against the side plate, the mounting plate presses the side of the center reduction joint, and the drill template slides into the inner wall of the mounting hole; the mounting plate is fixed to the side plate by butterfly nut 1, and the pressure plate is fixed to the mounting plate by butterfly nut 2.

[0009] Optionally, the positioning pin is composed of two cylindrical sections with different diameters, and the center reduction joint is supported on a stepped surface with a larger diameter on the positioning pin.

[0010] Optionally, a plurality of locking bolts are arranged on the positioning platform outside the positioning pin, and a clamping plate is tightly arranged on the upper end surface of the center reduction joint, and the clamping plate is pressed against the center reduction joint by a locking nut.

[0011] Optionally, a plurality of quick positioning devices are provided on the side of the positioning platform opposite to the side plate.

[0012] Optionally, a plurality of quick clamping devices are respectively provided on both sides of the upper axis of the side plate of the positioning platform.

[0013] Optionally, a plurality of limit pins are provided on one side of the positioning platform along the axis of the side plate.

[0014] Optionally, the side plate is provided with a plurality of through holes corresponding one to one with the stepped holes, and the diameter of the through holes is larger than the diameter of the drilling template.

[0015] The present invention has the following advantages and beneficial effects:

[0016] In the present invention, a tooling for reducing joints is designed, and a drilling jig mechanism installed on a positioning platform is designed. After the old part is disassembled, it is fixed on the positioning platform, and the drilling jig is slid into the mounting hole. The drilling jig drives the elastic rubber pad to move freely in the stepped hole, so as to achieve accurate positioning of the mounting hole on the old part. Then the pressing plate and the mounting plate are clamped to fix the drilling jig. After the position of the drilling jig is determined, the old part is removed, replaced with a new part, and holes are drilled on the new part. By studying the positioning tooling for reducing joints, the mounting holes of the old part can be accurately positioned, and the mounting holes of the new part can be accurately configured, and the interchangeability is strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the refitting tool provided by the present invention;

[0018] Figure 2 A schematic diagram of the replacement tooling provided by the present invention for clamping old parts;

[0019] Figure 3 A schematic diagram of a replacement tool for clamping a new part provided by the present invention;

[0020] Figure 4 A schematic diagram of the holes for clamping new parts in the replacement tooling provided by the present invention;

[0021] Figure 5 for Figure 4 Left view of

[0022] Figure 6 A schematic diagram of the installation of the drilling jig mechanism provided by the present invention;

[0023] Figure 7 for Figure 6 Sectional view along the AA direction;

[0024] Icons: 1-positioning platform, 11-side plate, 12-through hole, 2-mounting plate, 21-butterfly nut one, 22-step hole, 23-elastic rubber pad, 24-drilling template, 3-pressure plate, 31-guide hole, 32-butterfly nut two, 4-locking bolt, 41-locking nut, 5-locating pin, 6-clamp, 7-quick clamping device, 8-quick positioning device, 9-limit pin, 10-center reduction joint, 101-positioning hole, 102-mounting hole. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Example

[0028] There is no corresponding replacement, positioning and other technologies, process implementation methods and supporting process equipment in China for the crack failure that occurs during the use of the center reduction joint 10. In order to smoothly carry out the replacement work, explore the process methods for disassembling the faulty parts of the center reduction joint 10, positioning and matching holes for the new parts and the development of supporting process equipment.

[0029] Since the positioning hole 101 and the mounting hole 102 of the center reduction joint 10 are made by manual marking during assembly, the interchangeability is poor, and there is no mounting hole 102 on the new part, and special tooling needs to be developed to make the positioning holes and mounting holes of the new part.

[0030] like Figure 1 As shown, a helicopter center reduction joint crack failure replacement tool includes a positioning platform 1 and a drilling jig mechanism and other components.

[0031] like Figure 2 As shown, the center reduction joint 10 includes four positioning holes 101 located in the center and eight mounting holes 102 located on the side. The four positioning holes 101 are located at the center of the center reduction joint 10, which is at the center of clamping and processing, so the positions of the four positioning holes 101 are easy to locate; while the eight mounting holes 102 located on the bent side of the center reduction joint 10 are more difficult to locate. When a new part is made, the mounting holes 102 and positioning holes 101 are not processed, and temporary configuration is required, and the configuration accuracy and difficulty of the mounting holes 102 are very high.

[0032] like Figure 1-5 As shown, a side plate 11 corresponding to the middle reduction joint 10 is extended on one side of the positioning platform 1. The middle reduction joint 10 is in a bent shape, and its shape and angle correspond to the positioning platform 1 and the side plate 11. A drilling jig mechanism is provided on the side plate 11, and the drilling jig mechanism is used to prepare the mounting hole 102.

[0033] like Figure 1 As shown, in the present invention, the jig mechanism includes a mounting plate 2, a pressure plate 3 and a jig 24. The mounting plate 2 is fixed to the side plate 11 by two butterfly nuts 21 on both sides, and the pressure plate 3 is fixed to the mounting plate 2 by four butterfly nuts 32. The mounting plate 2 and the pressure plate 3 are fixed as a whole by butterfly nuts 32. Figure 7 As shown, the mounting plate 2 is provided with eight stepped holes 22 along the length direction, the pressing plate 3 is provided with guide holes 31 corresponding to the stepped holes 22, and the end of the stepped hole 22 with a larger aperture is arranged toward the guide hole 31, and the side plate 11 is provided with eight through holes 12 corresponding to the stepped holes 22, and the diameter of the through hole 12 is larger than the diameter of the drill jig 24. An elastic rubber pad 23 is provided on the stepped end surface of the stepped hole 22, and a drill jig 24 is provided in the inner support sleeve of the elastic rubber pad 23. The outer diameter of the drill jig 24 is smaller than the inner diameter of the stepped hole 22 and larger than the inner diameter of the guide hole 31. Specifically, the radius of the drill jig 24 is 2 mm smaller than the outer diameter of the stepped hole 22, so that it can move 4 mm in the diameter direction. No matter how the drill jig 24 moves, the center hole inside it is always located inside the guide hole 31.

[0034] It should be noted that the number, relative positions and sizes of the eight stepped holes 22 are set according to the eight mounting holes 102 on the center reduction joint 10 (old part), so that the positions of the eight stepped holes 22 roughly correspond to the eight mounting holes 102, but it must be ensured that the diameter of the stepped hole 22 is much larger than the diameter of the mounting hole 102, so that the drilling template 24 can be fine-tuned in the stepped hole 22, so as to achieve the positioning effect of the mounting hole 102 on the old part.

[0035] When the butterfly nut 2 32 is not tightened, the mounting plate 2 and the pressing plate 3 are not fastened together, and the end face of the drill jig 24 exposes the stepped hole 22, generally 0.5 mm. When the butterfly nut 2 32 is tightened, the mounting plate 2 and the pressing plate 3 are pressed and fastened to each other, and the drill jig 24 is pressed and fixed by the pressing plate 3, and the elastic rubber pad 23 is compressed and pressed. In order to ensure the stability of the pressing, a mesh pattern can be provided on the end face of the drill jig 24, which is in direct contact with the pressing plate 3. Under the reaction force of the elastic rubber pad 23, a pressing force is generated to prevent the drill jig 24 from being displaced, resulting in positioning failure.

[0036] like Figure 1 As shown, four positioning pins 5 are arranged on the positioning platform 1 . The positioning pin 5 is composed of two cylindrical sections with different diameters, with the larger section being located at the lower part. The intermediate reduction joint 10 is supported on the stepped surface with the larger diameter on the positioning pin 5 .

[0037] Three locking bolts 4 are arranged on the positioning platform 1 outside the positioning pin 5, two on one side and one on the other side. A clamping plate 6 is arranged closely on the upper end surface of the middle reduction joint 10, and a locking nut 41 is connected to the upper end of the locking bolt 4, and the clamping plate 6 presses the middle reduction joint 10 through the locking nut 41.

[0038] Two quick positioning devices 8 are arranged on a side of the positioning platform 1 opposite to the side plate 11 .

[0039] A quick clamping device 7 is provided on both sides of the positioning platform 1 along the axis of the side plate 11 .

[0040] Two limiting pins 9 are arranged on one side of the positioning platform 1 along the axis of the side plate 11 (ie, the side where the quick pressing device 7 is located).

[0041] like Figure 2 As shown, during installation, the center reduction joint 10 is fixed on the positioning pin 5 through four positioning holes 101 to achieve preliminary positioning, and the side of the center reduction joint 10 is set close to the side plate 11. The mounting plate 2 is pressed against the side of the center reduction joint 10 and fixed by a butterfly nut 21, and the drilling jig 24 is slidably inserted into the inner wall of the mounting hole 102, and the position of the mounting hole 102 is positioned by the drilling jig 24 (as shown in FIG. Figure 7 shown).

[0042] The center reduction joint 10 is installed at the corner of the tail beam and the oblique beam to fix the intermediate reducer. Since the positioning hole 101 and the mounting hole 102 of the center reduction joint 10 are made by manual marking during assembly, the interchangeability is poor, and there is no mounting hole 102 on the new part, so the positioning hole 101 and the mounting hole 102 of the new part need to be manufactured according to the special tooling.

[0043] Steps for preparing the positioning hole 101 and the mounting hole 102 of the center reduction joint 10:

[0044] 1. If Figure 2 As shown, the center reduction joint 10 (old part, cracked faulty part) on the fuselage is disassembled, and the center reduction joint 10 (old part, cracked faulty part) is placed on the positioning platform 1, and is positioned using two limit pins 9 and a quick positioning device 8, and at the same time, a center mark line of the center reduction joint 10 is made on the positioning platform 1.

[0045] 2. Install the four positioning pins 5 on the positioning platform 1, install the middle reduction joint 10 (old part, cracked faulty part) on the positioning pins 5 through the positioning hole 101, then install the clamping plate 6, tighten the locking nut 41, and fix the middle reduction joint 10 (old part, cracked faulty part).

[0046] 3. Figure 7 As shown, install the jig mechanism. First, fix and lock the mounting plate 2 on the side plate 11 through the butterfly nut 1 21, and then align the jig 24 with the mounting holes 102 of the middle reduction joint 10 (old parts, cracked faulty parts) and insert them one by one. When the jig 24 and the mounting hole 102 are misaligned, just press the jig 24 to slide it into the mounting hole 102. After the jig 24 is inserted, its position relative to the stepped hole 22 will be adjusted accordingly, and the elastic rubber pad 23 will be compressed and moved adaptively; then tighten the butterfly nut 2 32 to firmly fix the pressure plate 3 and the mounting plate 2, so that the bottom end of the pressure plate 3 presses the end face of the jig 24 to fix the jig 24 positioned in the mounting hole 102.

[0047] 4. Remove the old part after positioning: After the drill jig 24 is inserted into the mounting hole 102 of the middle reduction joint 10 (old part, cracked faulty part) for positioning and is fixed by the pressing plate 3, the middle reduction joint 10 (old part, cracked faulty part) can be removed. Specific operation: Disassemble the butterfly nut 21, remove the pressing plate 3 and the mounting plate 2 as a whole, at this time the drill jig 24 is fixed; then separate the locking nut 41, remove the clamping plate 6, loosen the quick positioning device 8 and the quick pressing device 7, and remove the middle reduction joint 10 (old part, cracked faulty part).

[0048] 5. Preparation of new part positioning hole 101: Figure 3As shown, the center reduction joint 10 (new part) is placed on the positioning platform 1, and the center line of the center reduction joint 10 (new part) is adjusted to coincide with the center line of the positioning platform 1 by using the quick positioning device 8, and four positioning holes 101 are prepared by using a drill bit and a reamer.

[0049] 6. Configuration of new component mounting hole 102: Figure 4 , Figure 5 As shown, the center reduction joint 10 (new part) is placed on the positioning platform 1, and the four positioning pins 5 are inserted into the positioning platform 1. The center reduction joint 10 (new part) is installed on the positioning pins 5 through the newly configured positioning holes 101, and then the clamping plate 6 is installed, and the locking nut 41 is tightened. At this time, the center reduction joint 10 (new part) is fixed and its side is set close to the inner wall of the side plate 11.

[0050] Then, if Figure 7 As shown, the jig mechanism is installed, and the mounting plate 2 and the pressure plate 3 are fixed to the side plate 11 as a whole through the butterfly nut 21, so that the side of the middle reduction joint 10 (new part) is set close to the jig 24, and the position of the jig 24 facing the side of the middle reduction joint 10 (new part) is the position of the mounting hole 102 on the new part, and then the tool is placed into the jig 24 along the guide hole 31, and the mounting hole 102 can be prepared on the side of the middle reduction joint 10 (new part). After the mounting hole 102 is prepared, the middle reduction joint 10 (new part) can be removed.

[0051] By adopting the above method, the mounting hole 102 of the disassembled center reduction joint 10 (old part, cracked faulty part) can be quickly and accurately positioned, and the center reduction joint 10 (new part) can be clamped on the corresponding tooling, so as to locate the position of the mounting hole 102 on the center reduction joint 10 (new part) and prepare a new hole.

[0052] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A tool for replacing crack faults in helicopter center reducer joints, comprising a drilling jig mechanism mounted on a positioning platform, characterized in that: The drilling jig mechanism comprises a mounting plate, a pressing plate and a drilling jig, wherein the mounting plate is provided with a plurality of stepped holes, and the pressing plate is provided with guide holes corresponding to the stepped holes one by one; an elastic rubber pad is provided on the stepped end surface of the stepped hole, and a drilling jig is provided in the inner support sleeve of the elastic rubber pad, and the outer diameter of the drilling jig is smaller than the inner diameter of the stepped hole and larger than the inner diameter of the guide hole; The center reduction joint includes a plurality of positioning holes located in the center and a plurality of mounting holes located on the sides; the stepped holes and the mounting holes correspond to each other in position; a side plate corresponding to the center reduction joint is extended on one side of the positioning platform, a positioning pin is provided on the positioning platform, the center reduction joint is fixed on the positioning pin through the positioning hole, the side of the center reduction joint is arranged close to the side plate, the mounting plate is pressed against the side of the center reduction joint, and the drilling jig is slidably clamped into the inner wall of the mounting hole; the mounting plate is fixed to the side plate through butterfly nut 1, and the pressing plate is fixed to the mounting plate through butterfly nut 2; The position of the stepped hole roughly corresponds to the mounting hole, the diameter of the stepped hole is much larger than the diameter of the mounting hole, and the drilling jig can be fine-tuned in the stepped hole; no matter how the drilling jig is moved, the center hole inside it is always located inside the guide hole; After the cracked faulty part is disassembled, it is fixed on the positioning platform, and the drill jig is slid into the mounting hole. The drill jig drives the elastic rubber pad to move freely in the stepped hole, so as to realize the precise positioning of the mounting hole on the cracked faulty part, and then the pressure plate and the mounting plate are clamped to fix the drill jig; after the drill jig is fixed, the pressure plate and the mounting plate are disassembled as a whole, the cracked faulty part is removed, and a new part is replaced, the mounting plate and the pressure plate are fixed to the side plate as a whole through the butterfly nut, and holes are drilled on the new part.

2. The helicopter center reducer joint crack failure replacement tool according to claim 1 is characterized by: The positioning pin is composed of two cylindrical sections with different diameters, and the center reduction joint is supported on a stepped surface with a larger diameter on the positioning pin.

3. The helicopter center reducer joint crack failure replacement tool according to claim 2 is characterized by: A plurality of locking bolts are arranged on the positioning platform outside the positioning pin, and a clamping plate is closely arranged on the upper end surface of the center reduction joint, and the clamping plate is pressed against the center reduction joint by a locking nut.

4. The helicopter center reducer joint crack failure replacement tool according to claim 3 is characterized by: A plurality of quick positioning devices are arranged on the side of the positioning platform opposite to the side plate.

5. The helicopter center reducer joint crack failure replacement tool according to claim 3 is characterized by: A plurality of quick clamping devices are respectively arranged on both sides of the upper side plate axis of the positioning platform.

6. The helicopter center reducer joint crack failure replacement tool according to claim 3 is characterized by: A plurality of limit pins are arranged on one side of the positioning platform along the axis of the side plate.

7. The helicopter center reducer joint crack failure replacement tool according to claim 3 is characterized by: The side plate is provided with a plurality of through holes corresponding to the stepped holes one by one, and the diameter of the through holes is larger than the diameter of the drilling jig.

8. A method for replacing a helicopter mid-reducing joint crack fault replacement tooling according to any one of claims 1 to 7, characterized in that: The following steps are involved:

1. Place the crack faulty part on the positioning platform, use the limit pin and quick positioning device to position it, and make a center mark line of the center reduction joint on the positioning platform; 2. Install the positioning pin on the positioning platform, and tighten the locking nut through the positioning hole of the crack faulty part to fix the crack faulty part; 3. Install the drilling jig mechanism: first, fix and lock the mounting plate on the side plate with butterfly nut 1, then align the drilling jig with the mounting holes of the cracked faulty parts and insert them one by one. When the drilling jig and the mounting hole are misaligned, press the drilling jig to slide it into the mounting hole; then tighten butterfly nut 2 to make the pressure plate press the mounting plate to fix the drilling jig; 4. Remove the old parts after positioning: disassemble butterfly nut 1, disassemble the pressure plate and mounting plate as a whole, and remove the cracked faulty parts; 5. Preparation of positioning holes for new parts: Place the new part on the positioning platform, use the quick positioning device to adjust the center line of the new part to coincide with the center line of the positioning platform, and use the drill and reamer to prepare four positioning holes; 6. New parts installation: install the new parts on the positioning platform through the newly configured positioning holes; 7. Preparation of mounting holes for new parts: Install the drilling jig mechanism again, fix the mounting plate and the pressure plate as a whole to the side plate through butterfly nut 1, so that the side of the new part is close to the drilling jig, and the position of the drilling jig facing the side of the new part is the position of the mounting holes on the new part. Then put the tool into the drilling jig along the guide hole, prepare the mounting holes on the side of the new part, and remove the new part after the mounting holes are prepared.

Images