Positioning device and method for integral drilling of bearing-free tail rotor blade

Abstract

The invention discloses a bearing-free type tail rotor blade integral drilling positioning device and method, and relates to the technical field of positioning devices.The bearing-free type tail rotor blade integral drilling positioning device comprises a base, a beam positioning module and a blade positioning module, the beam positioning module is arranged at one end of the base, the blade positioning module is arranged at the other end of the base, and the beam positioning module is connected with a mounting hole in a flexible beam of a tail rotor blade; the blade positioning module is attached to the lower surface of a mold pressing blade of the tail blade for positioning, the tail blade is connected to the beam positioning module and the blade positioning module in a suspended mode, guide holes for drilling are formed in the blade positioning module, and the guide holes are matched according to the set drilling position and size of the mold pressing blade. The drilling positioning device can effectively guarantee drilling positioning in the overall state of tail rotor blade assembly, the structure is simple, operation is convenient, reliability is high, overall clamping is conducted after the tail rotor blade is assembled, multiple sizes of the tail rotor blade are positioned and then combined for use, and high positioning precision and low operation difficulty of all the sizes during drilling are effectively guaranteed.

Description

Technical Field

[0001] This invention relates to the technical field of positioning devices, and in particular to a bearingless tail rotor integral drilling positioning device and method. Background Technology

[0002] To ensure interchangeability of individual tail rotor blades and maintain acceptable vibration levels within the plane of rotation after installation, the bearingless tail rotor requires overall balancing testing and adjustment after production and assembly. This adjustment involves drilling holes at specified locations on the tail rotor blades to add counterweights; a total of three holes are required. The dimensions of these holes include the axial distance from the blade center, the chordal distance from the leading edge of the tail rotor blade, the spacing between the three holes, and the drilling angle. High precision is required for these dimensions.

[0003] However, the current drilling position positioning method involves using a dedicated platform to measure and mark lines, and then using pads to support the tail rotor flexible beam before drilling according to the marked lines. This method suffers from low drilling efficiency, low accuracy and large errors in hole positioning, high processing difficulty requiring a high level of skill, and difficulties in supporting the irregularly shaped tail rotor blades during drilling, which can easily lead to displacement. Summary of the Invention

[0004] The purpose of this invention is to provide a bearingless tail rotor blade integral drilling and positioning device and method to solve the problems existing in the prior art, making tail rotor blade drilling operation convenient and positioning accuracy high.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] This invention provides a bearingless tail rotor blade integral drilling and positioning device, including a base, a flexible beam positioning module, and a blade positioning module. The flexible beam positioning module is disposed at one end of the base and the blade positioning module is disposed at the other end. The flexible beam positioning module is connected to the mounting hole on the flexible beam of the tail rotor blade and can limit the horizontal rotation of the flexible beam. The blade positioning module is fitted and positioned against the lower surface of the molded blade of the tail rotor blade and can limit the horizontal torsion angle of the molded blade. The tail rotor blade is suspended and connected to the flexible beam positioning module and the blade positioning module. The blade positioning module is provided with a guide hole for drilling, which is matched according to the set drilling position and size on the molded blade.

[0007] Preferably, the base is an L-shaped rectangular plate, with the narrow end of the base connected to the flexible beam positioning module via a positioning pin and the wide end connected to the blade positioning module via a positioning pin; the lower end of the positioning pin is interference-fitted with the base, and the upper end is clearance-fitted with the flexible beam positioning module or the blade positioning module.

[0008] Preferably, the flexible beam positioning module includes a positioning shaft and a locking nut. The positioning shaft has mounting holes for the flexible beam and is connected to the end of the positioning shaft by the locking nut.

[0009] Preferably, the positioning shaft is a three-section stepped shaft, the mounting hole of the flexible beam is inserted into the middle section of the shaft and overlaps the shoulder of the largest dimension, the smallest dimension shaft section is connected to the locking nut by a thread, and the length of the middle section of the shaft is less than the height of the mounting hole.

[0010] Preferably, the positioning shaft is located on the center line of the narrow end of the base, and an open washer is provided between the locking nut and the mounting hole of the flexible beam; the open washer is made of nylon, and the base and the positioning shaft are connected by a bolt.

[0011] Preferably, the blade positioning module includes a positioning seat and a drilling template. The bottom of the positioning seat is provided with a limiting surface and the two sides are respectively provided with limiting blocks. The limiting surface is in contact with the blade profile surface after the molded blade is twisted by a set angle. The drilling template is horizontally set on one of the limiting blocks and has a plurality of guide holes vertically arranged on the drilling template.

[0012] Preferably, the limiting block includes a leading edge limiting block and a trailing edge limiting block. A drilling template is connected to the leading edge limiting block by bolts and / or diamond pins. The lower end of the diamond pin is interference-fitted with the leading edge limiting block, and the upper end is transition-fitted with the drilling template. The length of the drilling template is greater than half the width of the wide end of the base. An adjusting positioning component is provided on the trailing edge limiting block. The inner surface of the adjusting positioning component abuts against the trailing edge of the molded blade. The positioning seat is provided with different models that are matched with molded blades of different blade profiles, sizes, and torsion angles. The fitting ratio between the limiting surface and the cross-section of the blade profile of the molded blade is at least 50%.

[0013] Preferably, the adjusting and positioning assembly includes a pressure block and an adjusting bolt. A positioning groove is provided between the rear edge limiting block and the limiting surface. The pressure block is slidably disposed in the positioning groove. One end of the pressure block abuts against the rear edge of the molded paddle and the other end abuts against the adjusting bolt. The adjusting bolt is threadedly connected to the rear edge limiting block. The materials of the pressure block and the positioning seat both include aluminum or nylon.

[0014] Preferably, the guide holes are located on the center line of the narrow end of the base and three are arranged side by side. The diameter of the guide holes is 0.016mm-0.059mm larger than the diameter of the drill hole. The length of the positioning seat is the same as the width of the wide end of the base and the width is at least 1cm. Two lifting rings are provided at each end of the base.

[0015] This invention also relates to a method for drilling and positioning an integral bearingless tail rotor blade, based on the aforementioned method for drilling and positioning an integral bearingless tail rotor blade, specifically including the following steps:

[0016] S1, the flexible beam of the tail rotor blade and the molded blade are installed as a whole, the molded blade is twisted to a set twist angle, and the positioning seat and drilling template of the blade positioning module matching the blade profile are modeled and manufactured using this twist angle. The positioning seat is first installed on the base.

[0017] S2, the flexible beam positioning module is connected to the mounting hole on the flexible beam, the blade positioning module is fitted and positioned against the lower surface of the molded blade of the tail blade, and then the drilling template is installed;

[0018] S3. Drill vertically along the position of the guide hole on the drilling template. When the drilling depth reaches 10mm, remove the drilling template for chip removal and continue drilling along the current drilling direction until the set drilling depth is reached.

[0019] The present invention achieves the following technical effects compared to the prior art:

[0020] This invention provides a device that can effectively ensure drilling positioning in the overall state of tail rotor assembly. It has a simple structure, is easy to operate, and has high reliability. It adopts a method of clamping the tail rotor as a whole after assembly, positioning multiple dimensions separately and then combining them for use. This effectively ensures high positioning accuracy of various dimensions during drilling and low operation difficulty. It solves the problems of low hole positioning accuracy, large error, high processing difficulty, and easy deviation during drilling that exist in the overall drilling of bearingless tail rotor blades. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the bearingless tail rotor integral drilling and positioning device in an embodiment of the present invention.

[0023] Figure 2 This is a top view of the bearingless tail rotor integral drilling and positioning device in an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the cross-sectional structure of AA in an embodiment of the present invention;

[0025] In the diagram: 1-base, 2-positioning seat, 3-drilling template, 4-positioning shaft, 5-open washer, 6-locking nut, 7-adjusting bolt, 8-pressure block, 9-diamond pin, 10-bolt, 11-lifting ring, 12-positioning groove, 13-positioning pin, 14-guide hole, 15-flexible beam, 16-molded blade, 17-front edge limiting block, 18-rear edge limiting block. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] The purpose of this invention is to provide a bearingless tail rotor blade integral drilling and positioning device and method to solve the problems existing in the prior art, making tail rotor blade drilling operation convenient and positioning accuracy high.

[0028] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Example 1

[0030] like Figures 1 to 3 As shown, this embodiment provides a bearingless tail rotor integral drilling and positioning device, including a base 1, a flexible beam positioning module and a blade positioning module. One end of the base 1 is provided with a flexible beam positioning module and the other end is provided with a blade positioning module. The flexible beam positioning module is connected to the mounting hole on the flexible beam 15 of the tail rotor and can limit the horizontal rotation of the flexible beam 15. The blade positioning module is fitted and positioned against the lower surface of the molded blade 16 of the tail rotor and can limit the horizontal torsion angle of the molded blade 16. The tail rotor is suspended and connected to the flexible beam positioning module and the blade positioning module. The blade positioning module is provided with a guide hole 14 for drilling. The guide hole 14 is matched according to the set drilling position and size on the molded blade 16.

[0031] As an optional solution, in this embodiment, the base 1 is an L-shaped rectangular plate. The narrow end of the base 1 is connected to the flexible beam positioning module through the positioning pin 13, and the wide end is connected to the blade positioning module through the positioning pin 13. The lower end of the positioning pin 13 is interference-fitted with the base 1, and the upper end is clearance-fitted with the flexible beam positioning module or the blade positioning module, which facilitates the replacement of the flexible beam positioning module or the blade positioning module to adapt to tail rotor blades of different models, sizes and blade profiles.

[0032] As an optional solution, the flexible beam positioning module in this embodiment includes a positioning shaft 4 and a locking nut 6. The positioning shaft 4 is connected to the mounting hole of the flexible beam 15 and is connected to the end of the positioning shaft 4 through the locking nut 6, so as to lock and position the flexible beam 15 and ensure that the tail rotor blade does not deviate in the axial direction.

[0033] As an optional solution, in this embodiment, the positioning shaft 4 is a three-section stepped shaft. The mounting hole of the flexible beam 15 is inserted into the middle section of the shaft and overlaps the largest shoulder. The smallest shaft section is connected to the locking nut 6 by threads. The length of the middle section of the shaft is less than the height of the mounting hole, so that the shaft diameter for mounting the locking nut 6 is minimized, which facilitates assembly and matching.

[0034] As an optional solution, in this embodiment, the positioning shaft 4 is located on the center line of the narrow end of the base 1, and an open washer 5 is provided between the locking nut 6 and the mounting hole of the flexible beam 15; the material of the open washer 5 includes nylon to avoid hard contact that could damage the surface of the flexible beam 15. The base 1 and the positioning shaft 4 are connected by a (countersunk) bolt 10, which can fix the positioning shaft 4 on the base 1.

[0035] As an optional solution, the blade positioning module in this embodiment includes a positioning seat 2 and a drilling template 3. The bottom of the positioning seat 2 is provided with a limiting surface, and the two sides are respectively provided with limiting blocks. The limiting surface is in contact with the blade profile of the molded blade 16 after being twisted by a set angle, ensuring that the tail blade does not deviate in the chord direction. The drilling template 3 is horizontally set on a limiting block, and several guide holes 14 are vertically provided on the drilling template 3. When drilling the tail blade, the drill bit can be guided directly to drill holes on the tail blade through the drilling template, which is convenient and quick to operate. In this embodiment, the positioning seat 2 is provided with different models that are matched with different blade profiles, sizes and twist angles of the molded blade 16, which is convenient to replace according to needs and expands the applicability of the positioning fixture. The contact ratio between the limiting surface and the cross-section of the blade profile of the molded blade 16 is at least 50%, and in this embodiment, the contact ratio is preferably 60%. Both sides of the contact surface are provided with recesses to facilitate assembly and workpiece handling.

[0036] As an optional solution, in this embodiment, the limiting block includes a front limiting block 17 and a rear limiting block 18. The front limiting block 17 is connected to a drilling template 3 by bolts 12 and / or diamond pins 9. The lower end of the diamond pin 9 is interference-fitted with the front limiting block 17, and the upper end is transition-fitted with the drilling template 3, which facilitates quick disassembly of the drilling template 3. The length of the drilling template 3 is greater than half the width of the wide end of the base 1. An adjustment positioning component is provided on the rear limiting block 18. The inner side of the adjustment positioning component abuts against the rear edge of the molded blade 16, which facilitates the positioning of the molded blade 16 in the same series.

[0037] As an optional solution, in this embodiment, the adjusting positioning component includes a pressure block 8 and an adjusting bolt 7. A positioning groove 12 is provided between the rear edge limiting block 18 and the limiting surface. The pressure block 8 is slidably disposed in the positioning groove 12. One end of the pressure block 8 abuts against the rear edge of the molded blade 16, and the other end abuts against the adjusting bolt 7. The adjusting bolt 7 is threadedly connected to the rear edge limiting block 18. At the same time, a handle is installed on the outer end of the adjusting bolt 7 for easy operation. The sliding displacement of the pressure block 8 is preferably 5mm-10mm to facilitate precise positioning of both sides of the molded blade 16. The materials of the pressure block 8 and the positioning seat 2 are both aluminum or nylon, preferably aluminum, which is easy to process and has low manufacturing cost.

[0038] As an optional solution, in this embodiment, the guide holes 14 are located on the center line of the narrow end of the base 1 and are arranged side by side. The opening position can also be changed according to the actual position requirements. The diameter of the guide holes 14 is 0.016mm-0.059mm larger than the drilling diameter. The length of the positioning seat 2 is the same as the width of the wide end of the base 1, and the width is at least 1cm to provide sufficient positioning surface and support force. Two lifting rings 11 are provided at each end of the base 1 to facilitate hoisting and relocation.

[0039] This embodiment provides a device that can effectively ensure drilling positioning when the tail rotor blade is assembled as a whole. The positioning shaft 4, positioning seat 2, adjusting positioning component, and drilling template 3 are positioned in four places, which fully ensures that there is no angular or directional deviation or deformation when drilling the tail rotor blade as a whole, and at the same time ensures the dimensional accuracy of the hole spacing between the three holes. The device has a simple structure, is easy to operate, and has high reliability.

[0040] Example 2

[0041] This embodiment provides a method for drilling and positioning a bearingless tail rotor blade as a whole, based on the bearingless tail rotor blade drilling and positioning device of Embodiment 1 above, and specifically includes the following steps:

[0042] S1, install the flexible beam 15 of the tail rotor blade and the molded blade 16 as a whole, twist the molded blade 16 to the set twist angle, and use this twist angle to model and manufacture the positioning seat 2 and drilling template 3 of the blade positioning module that match the blade profile. First, install the positioning seat 2 onto the base 1.

[0043] S2, the flexible beam positioning module is connected to the mounting hole on the flexible beam 15, the blade positioning module is fitted and positioned against the lower surface of the molded blade 16 of the tail blade, and at the same time the adjusting bolt 7 of the adjusting positioning component is tightened so that the pressure block 8 presses the rear edge of the molded blade 16 to ensure that there is no angular or directional deviation or deformation when the tail blade is drilled as a whole, and then the drilling template 3 is installed.

[0044] S3, drill vertically along the position of the guide hole 14 on the drilling template 3. When the drilling depth reaches 10mm, remove the drilling template 3 for chip removal and continue drilling along the current drilling direction until the set drilling depth is reached.

[0045] This embodiment features convenient positioning and high reliability. It adopts a tail rotor assembly for overall clamping, with multiple dimensions positioned separately and then combined for use. The irregular surface support and limit at the drilling position, and the vertical guidance of the drilling template 3, effectively ensure the positioning accuracy of various dimensions during drilling, reduce the difficulty of operation, and solve the problems of low hole size positioning accuracy, large error, high processing difficulty, and easy deviation during drilling that exist in the overall drilling of the tail rotor blade of the bearingless tail rotor.

[0046] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A bearingless tail vane integral drilling positioning device, characterized by: The device comprises a base, a flexible beam positioning module and a paddle positioning module, one end of the base is provided with the flexible beam positioning module, the other end is provided with the paddle positioning module, the flexible beam positioning module is connected with the mounting hole on the flexible beam of the tail paddle and can limit the horizontal rotation of the flexible beam, the paddle positioning module is in close contact with the lower surface of the molded paddle of the tail paddle and can limit the horizontal torsion angle of the molded paddle, the tail paddle is suspendedly connected to the flexible beam positioning module and the paddle positioning module, the paddle positioning module is provided with a guide hole for drilling, and the guide hole is matched with the set drilling position and size on the molded paddle.

2. The boreless tail vane integral positioning device of claim 1, wherein: The base is an L-shaped rectangular plate, the narrow end of the base is connected with the flexible beam positioning module through a positioning pin, and the wide end is connected with the paddle positioning module through a positioning pin; the lower end of the positioning pin is in interference fit with the base, and the upper end is in clearance fit with the flexible beam positioning module or the paddle positioning module.

3. The boreless tail vane integral positioning device of claim 2, wherein: The flexible beam positioning module comprises a positioning shaft and a locking nut, the mounting hole of the flexible beam is connected to the end of the positioning shaft through the locking nut.

4. The boreless tail vane integral positioning device of claim 3, wherein: The positioning shaft is a three-section stepped shaft, the mounting hole of the flexible beam is inserted into the middle section shaft and overlapped on the largest size shaft shoulder, the smallest size shaft section is connected with the locking nut through threads, and the length of the middle section shaft is smaller than the height of the mounting hole.

5. The boreless tail vane integral positioning device of claim 3, wherein: The positioning shaft is located on the center line of the narrow end of the base, and an open washer is arranged between the locking nut and the mounting hole of the flexible beam; the material of the open washer comprises nylon, and the base and the positioning shaft are connected through a bolt.

6. The boreless tail vane integral positioning device of claim 2, wherein: The paddle positioning module comprises a positioning seat and a drilling template, the bottom of the positioning seat is provided with a limiting surface, and the two sides are respectively provided with limiting blocks, the limiting surface is in close contact with the blade surface of the molded paddle after torsion at a set angle, the drilling template is horizontally arranged on one of the limiting blocks, and a plurality of guide holes are vertically arranged on the drilling template.

7. The boreless tail vane integral positioning device of claim 6, wherein: The limiting block comprises a leading edge limiting block and a trailing edge limiting block, the drilling template is connected to the leading edge limiting block through a bolt and / or a diamond-shaped pin, the lower end of the diamond-shaped pin is in interference fit with the leading edge limiting block, and the upper end is in transition fit with the drilling template, the length of the drilling template is greater than half the width of the wide end of the base, and an adjusting positioning assembly is arranged on the trailing edge limiting block, and the inner side surface of the adjusting positioning assembly is in abutment with the trailing edge of the molded paddle; the positioning seat is provided with different models and is matched with molded paddles of different blade surfaces, sizes and torsion angles, and the close contact ratio of the limiting surface and the blade surface cross section of the molded paddle is at least 50%.

8. The boreless tail vane integral positioning device of claim 7, wherein: The adjusting positioning assembly comprises a pressing block and an adjusting bolt, a positioning groove is arranged between the rear edge limiting block and the limiting surface, the pressing block is slidingly arranged in the positioning groove, one end of the pressing block is in abutment with the rear edge of the molded paddle, the other end is in abutment with the adjusting bolt, the adjusting bolt is threadedly connected to the rear edge limiting block, and the materials of the pressing block and the positioning seat both comprise aluminum or nylon.

9. The boreless tail vane integral positioning device of claim 6, wherein: The guide holes are arranged in three in parallel on the center line of the narrow end of the base, the diameter of the guide hole is 0.016mm-0.059mm larger than the diameter of the drilling hole, the length of the positioning seat is the same as the width of the wide end of the base, and the width is at least 1cm, and two lifting rings are arranged at each end of the base.

10. A method of bore positioning of a bearingless tail vane monolith, based on the bore positioning device of any one of claims 1 to 8, characterized in that Specifically comprising the following steps: S1, the flexible beam and the molded paddle of the tail paddle are installed as a whole, the molded paddle is twisted to a set twist angle, the positioning seat and the drilling template of the paddle positioning module matching the blade profile are modeled and manufactured according to the twist angle, and the positioning seat is first installed on the base; S2, the flexible beam positioning module is connected with the mounting hole on the flexible beam, the paddle positioning module is positioned in abutment with the lower surface of the molded paddle of the tail paddle, and then the drilling template is installed; S3, vertical drilling is performed along the position of the guide hole on the drilling template, when the drilling depth reaches 10mm, the drilling template is disassembled for chip removal, and drilling is continuously performed along the current drilling direction until the set drilling depth is reached.

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