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

Abstract

The utility model discloses a bearing-free type tail rotor blade integral drilling positioning device, which relates to the technical field of positioning devices and 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, the beam positioning module is connected with a mounting hole on a flexible beam of a tail rotor blade, and the beam positioning module is connected with the blade positioning module. 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 utility model provides a device capable of effectively ensuring drilling positioning under the condition that the tail rotor blade is assembled integrally, the structure is simple, the operation is convenient, the reliability is high, the tail rotor blade is integrally clamped after being assembled, a plurality of sizes are respectively positioned and then combined for use, and the higher positioning accuracy and the lower operation difficulty of each size during drilling are effectively ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of positioning devices, in particular to a bearingless tail rotor blade integral drilling positioning device. Background Technique

[0002] In order to achieve single-piece interchangeability of the tail rotor blades and ensure that the vibration level of the tail rotor after installation meets the requirements in the rotation plane, it is necessary to perform balance measurement and adjustment on the whole tail rotor blade after production and assembly. The adjustment method is as follows: drill holes at specified positions on the tail rotor blade to add counterweights, and there are 3 hole positions in total. The drilling position dimensions include the axial dimension from the center of the blade, the chord dimension from the leading edge of the tail rotor blade, the hole spacing between the three hole positions, and the drilling angle dimension, etc., and the corresponding dimension requirements are relatively high.

[0003] However, the current drilling position positioning method is as follows: measure and draw lines on a special platform, and use a spacer to support the flexible beam of the tail rotor blade to drill holes according to the drawn line position. This method has problems such as low drilling efficiency, low positioning accuracy and large error of hole position dimensions, difficult processing and high skill level required, and difficult support for the special-shaped surface of the tail rotor blade during drilling and easy deviation. Content of the Utility Model

[0004] The purpose of the utility model is to provide a bearingless tail rotor blade integral drilling positioning device to solve the problems existing in the above-mentioned prior art, and make the drilling operation of the tail rotor blade convenient and have high positioning accuracy.

[0005] To achieve the above purpose, the utility model provides the following scheme:

[0006] The utility model provides a bearingless tail rotor blade integral drilling positioning device, which includes a base, a flexible beam positioning module and a blade positioning module. One end of the base is provided with the flexible beam positioning module, and the other end is provided with the blade positioning module. 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 attached and positioned to 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, and the guide hole matches the set drilling position and size on the molded blade.

[0007] Preferably, the base is an L-shaped rectangular plate. The narrow end of the base is connected to the flexible beam positioning module through a positioning pin, and the wide end is connected to the blade 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 blade positioning module.

[0008] Preferably, the flexible beam positioning module includes a positioning shaft and a locking nut. The mounting hole of the flexible beam is connected to the positioning shaft and is connected to the end of the positioning shaft through 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 shaft and overlaps on the shoulder with the largest dimension. The shaft section with the smallest dimension is connected to the locking nut by a thread, and the length of the middle section 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. An opening washer is provided between the locking nut and the mounting hole of the flexible beam. The material of the opening washer includes 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. A limiting surface is provided at the bottom of the positioning seat, and limiting blocks are respectively provided on both sides. The limiting surface fits with the blade profile surface after the molded blade is twisted by a set angle. The drilling template is horizontally arranged on one of the limiting blocks, and a plurality of guiding holes are vertically arranged on the drilling template.

[0012] Preferably, the limiting blocks include a leading edge limiting block and a trailing edge limiting block. The drilling template is connected to the leading edge limiting block by bolts and / or diamond pins. The lower end of the diamond 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 of the width of the wide end of the base. An adjusting and positioning component is provided on the trailing edge limiting block, and the inner side surface of the adjusting and positioning component abuts against the trailing edge of the molded blade. The positioning seat has different models and is respectively matched with molded blades with different blade profile surfaces, sizes and twisting angles. The fitting ratio of the limiting surface to the cross-section of the blade profile surface of the molded blade is at least 50%.

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

[0014] Preferably, the guiding holes are located on the center line of the narrow end of the base and are arranged in parallel with three. The diameter of the guiding holes is 0.016 mm - 0.059 mm larger than the drilling diameter. 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 1 cm. Two lifting rings are respectively provided at both ends of the base.

[0015] The utility model has achieved the following technical effects compared with the prior art:

[0016] The utility model provides a device that can effectively ensure drilling positioning in the overall state of the tail rotor blade assembly. The structure is simple, the operation is convenient, and the reliability is high. After the tail rotor blade is assembled, it is clamped as a whole, and multiple dimensions are positioned separately and then used in combination, effectively ensuring high positioning accuracy of various dimensions during drilling and low operation difficulty, and solving the problems existing in the overall drilling of the bearingless tail rotor blade, such as low positioning accuracy of hole position dimensions, large error, high processing difficulty, and easy deviation of drilling. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic structural diagram of the overall drilling positioning device for the bearingless tail rotor blade in the embodiment of the present utility model;

[0019] Figure 2 It is a top view of the overall drilling positioning device for the bearingless tail rotor blade in the embodiment of the present utility model;

[0020] Figure 3 It is a schematic cross-sectional structural diagram of A-A in the embodiment of the present utility model;

[0021] In the figure: 1 - base, 2 - positioning seat, 3 - drilling template, 4 - positioning shaft, 5 - split washer, 6 - lock nut, 7 - adjusting bolt, 8 - pressing block, 9 - diamond pin, 10 - bolt, 11 - eyebolt, 12 - positioning groove, 13 - positioning pin, 14 - guiding hole, 15 - flexible beam, 16 - molded blade, 17 - leading edge limiting block, 18 - trailing edge limiting block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0023] The purpose of the present utility model is to provide an overall drilling positioning device for a bearingless tail rotor blade to solve the problems existing in the prior art and make the drilling operation of the tail rotor blade convenient and have high positioning accuracy.

[0024] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Embodiment 1

[0026] As Figures 1 to 3 shown, in this embodiment, a bearingless tail rotor blade integral drilling positioning device is provided, including a base 1, a flexible beam positioning module, and a blade positioning module. A flexible beam positioning module is provided at one end of the base 1, and a blade positioning module is provided at the other end. The flexible beam positioning module is connected to the mounting hole on the flexible beam 15 of the tail rotor blade and can limit the horizontal rotation of the flexible beam 15. The blade positioning module fits and positions with the lower surface of the molded blade 16 of the tail rotor blade and can limit the horizontal torsion angle of the molded blade 16. The tail rotor blade is suspended and connected to the flexible beam positioning module and the blade positioning module. A guide hole 14 for drilling is provided on the blade positioning module, and the guide hole 14 matches the set drilling position and size on the molded blade 16.

[0027] As an alternative 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 a positioning pin 13, and the wide end is connected to the blade positioning module through a positioning pin 13. The lower end of the positioning pin 13 is in interference fit with the base 1, and the upper end is in clearance fit with the flexible beam positioning module or the blade positioning module, facilitating 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.

[0028] As an alternative solution, in this embodiment, the flexible beam positioning module includes a positioning shaft 4 and a locking nut 6. The mounting hole of the flexible beam 15 is connected to the positioning shaft 4 and is connected to the end of the positioning shaft 4 through the locking nut 6 to achieve the locking and positioning of the flexible beam 15 and ensure that the tail rotor blade does not deviate in the axial direction.

[0029] As an alternative 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 shaft and overlaps on the shoulder with the largest dimension. The shaft section with the smallest dimension is connected to the locking nut 6 through a thread, and the length of the middle section shaft is less than the height of the mounting hole, making the shaft diameter for installing the locking nut 6 the smallest and facilitating assembly and matching.

[0030] As an alternative solution, in this embodiment, the positioning shaft 4 is located on the center line of the narrow end of the base 1. An opening washer 5 is provided between the locking nut 6 and the mounting hole of the flexible beam 15. The material of the opening washer 5 includes nylon to avoid hard contact and damage to the surface of the flexible beam 15. The base 1 and the positioning shaft 4 are connected through a (countersunk head) bolt 10, and the positioning shaft 4 can be fixed on the base 1.

[0031] As an alternative, in this embodiment, the blade positioning module includes a positioning base 2 and a drilling template 3. The bottom of the positioning base 2 is provided with a limiting surface, and limiting blocks are respectively arranged on both sides. The limiting surface fits with the blade profile surface after the molded blade 16 is twisted by a set angle, ensuring that the tail blade does not shift in the chord direction. The drilling template 3 is horizontally arranged on one of the limiting blocks, and a plurality of guiding holes 14 are vertically arranged on the drilling template 3. When drilling the tail blade, the drill bit can directly drill on the tail blade under the guidance of the drill template, which is convenient and fast. In this embodiment, the positioning base 2 is provided with different models and respectively matches the molded blades 16 with different blade profile surfaces, sizes, and twisting angles, facilitating replacement according to requirements, expanding the applicable range of this positioning tooling. The fitting ratio of the limiting surface to the cross-section of the blade profile surface of the molded blade 16 is at least 50%, and in this embodiment, the preferred fitting ratio is 60%. Depressions are arranged on both sides of the fitting surface, facilitating the assembly and picking of workpieces.

[0032] As an alternative, in this embodiment, the limiting blocks include a leading-edge limiting block 17 and a trailing-edge limiting block 18. The drilling template 3 is connected to the leading-edge limiting block 17 through bolts 12 and / or diamond pins 9. The lower end of the diamond pin 9 is in interference fit with the leading-edge limiting block 17, and the upper end is in transitional fit with the drilling template 3, facilitating the quick disassembly of the drilling template 3. The length of the drilling template 3 is greater than half of the width of the wide end of the base 1. An adjusting and positioning component is arranged on the trailing-edge limiting block 18, and the inner side surface of the adjusting and positioning component abuts against the trailing edge of the molded blade 16, facilitating the positioning of the molded blades 16 of the same series.

[0033] As an alternative, in this embodiment, the adjusting and positioning component includes a pressing block 8 and an adjusting bolt 7. A positioning groove 12 is arranged between the trailing-edge limiting block 18 and the limiting surface. The pressing block 8 is slidably arranged in the positioning groove 12. One end of the pressing block 8 abuts against the trailing 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 trailing-edge limiting block 18. At the same time, a handle is installed at the outer end of the adjusting bolt 7 for easy operation. The sliding displacement of the pressing block 8 is preferably 5 mm - 10 mm, facilitating the accurate limiting of both sides of the molded blade 16. The materials of the pressing block 8 and the positioning base 2 both include aluminum or nylon, preferably aluminum, which is convenient for processing and has a low manufacturing cost.

[0034] As an alternative, in this embodiment, the guiding holes 14 are located on the center line of the narrow end of the base 1 and three are arranged side by side. The opening positions can also be changed according to actual position requirements. The diameter of the guiding holes 14 is 0.016 mm - 0.059 mm larger than the drilling diameter; the length of the positioning base 2 is the same as the width of the wide end of the base 1, and the width is at least 1 cm, facilitating the provision of sufficient positioning surfaces and supporting forces. Two lifting rings 11 are arranged at both ends of the base 1, facilitating hoisting and shifting.

[0035] This embodiment provides a device that can effectively ensure drilling positioning in the overall state of the tail rotor blade assembly. The positioning shaft 4, the positioning seat 2, the adjustment and positioning assembly, and the drilling template 3 are used for positioning in four places, fully ensuring that there is no angular deviation or deformation during the overall drilling of the tail rotor blade. At the same time, the dimensional accuracy of the hole pitch between the three holes is ensured. The device has a simple structure, is easy to operate, and has high reliability.

[0036] Embodiment 2

[0037] This embodiment provides a method for overall drilling positioning of a bearingless tail rotor blade. Based on the bearingless tail rotor blade overall drilling positioning device in the above Embodiment 1, the specific steps are as follows:

[0038] S1. Install the flexible beam 15 and the molded blade 16 of the tail rotor blade as a whole, twist the molded blade 16 to a set twist angle, and manufacture the positioning seat 2 and the drilling template 3 of the blade positioning module that match the blade profile surface according to this twist angle. First, install the positioning seat 2 on the base 1.

[0039] S2. Connect the flexible beam positioning module to the mounting holes on the flexible beam 15, and fit and position the blade positioning module with the lower surface of the molded blade 16 of the tail rotor blade. At the same time, tighten the adjustment bolt 7 of the adjustment and positioning assembly to make the pressing block 8 press the trailing edge of the molded blade 16, ensuring that there is no angular deviation or deformation during the overall drilling of the tail rotor blade, and then install the drilling template 3.

[0040] S3. Drill vertically along the position of the guiding hole 14 on the drilling template 3. After the drilling depth reaches 10 mm, remove the drilling template 3 for chip removal, and continue drilling along the current drilling direction until the set drilling depth is reached.

[0041] The positioning operation in this embodiment is convenient and has high reliability. The overall clamping of the tail rotor blade assembly is adopted, and multiple dimensions are positioned separately and then used in combination. The special-shaped surface of the drilling position is supported and limited, and the drilling template 3 is vertically guided for processing, effectively ensuring the positioning accuracy of various dimensions during drilling, reducing the operation difficulty, and solving the problems of low positioning accuracy of hole position dimensions, large error, difficult processing, and easy deviation during drilling of the overall drilling of the tail rotor blade of the bearingless tail rotor.

[0042] In the present utility model, specific examples are used to elaborate on the principle and implementation mode of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A bearingless tail rotor blade integral drilling positioning device, characterized in that: It includes a base, a flexible beam positioning module and a blade positioning module. One end of the base is provided with the flexible beam positioning module, and the other end is provided with the blade positioning module. 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 fits and positions with 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. A guiding hole for drilling is provided on the blade positioning module, and the guiding hole matches the set drilling position and size on the molded blade.

2. The bearingless tail rotor blade integral drilling positioning device according to claim 1, characterized in that: The base is an L-shaped rectangular plate. The narrow end of the base is connected to the flexible beam positioning module through a positioning pin, and the wide end is connected to the blade 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 blade positioning module.

3. The bearingless tail rotor blade integral drilling positioning device according to claim 2, characterized in that: The flexible beam positioning module includes a positioning shaft and a locking nut. The mounting hole of the flexible beam is connected to the positioning shaft and is connected to the end of the positioning shaft through the locking nut.

4. The bearingless tail rotor blade integral drilling positioning device according to claim 3, characterized in that: The positioning shaft is a three-stage stepped shaft. The mounting hole of the flexible beam is inserted into the middle-section shaft and overlaps on the shoulder with the largest dimension. The shaft section with the smallest dimension is connected to the locking nut through a thread, and the length of the middle-section shaft is less than the height of the mounting hole.

5. The bearingless tail rotor blade integral drilling positioning device according to claim 3, wherein: The positioning shaft is located on the center line of the narrow end of the base. An opening washer is provided between the locking nut and the mounting hole of the flexible beam. The material of the opening washer includes nylon. The base and the positioning shaft are connected through a bolt.

6. The bearingless tail rotor blade integral drilling positioning device according to claim 2, characterized in that: The blade positioning module includes a positioning seat and a drilling template. A limiting surface is provided at the bottom of the positioning seat, and limiting blocks are respectively provided on both sides. The limiting surface fits with the blade profile surface after the molded blade is twisted by a set angle. The drilling template is horizontally arranged on one of the limiting blocks, and a plurality of the guiding holes are vertically arranged on the drilling template.

7. The bearingless tail rotor blade integral drilling positioning device according to claim 6, characterized in that: The limiting blocks include a leading-edge limiting block and a trailing-edge limiting block. The drilling template is connected to the leading-edge limiting block through bolts and / or diamond pins. The lower end of the diamond pin is in interference fit with the leading-edge limiting block, and the upper end is in transitional fit with the drilling template. The length of the drilling template is greater than half of the width of the wide end of the base. An adjusting and positioning component is provided on the trailing-edge limiting block, and the inner side surface of the adjusting and positioning component abuts against the trailing edge of the molded blade. Different models of the positioning seat are provided and respectively match the molded blades with different blade profiles, sizes and torsion angles. The fitting ratio of the limiting surface to the cross-section of the blade profile surface of the molded blade is at least 50%.

8. The bearingless tail rotor blade integral drilling positioning device according to claim 7, characterized in that: The adjusting and positioning component includes a pressing block and an adjusting bolt. A positioning groove is provided between the trailing-edge limiting block and the limiting surface. The pressing block is slidably arranged in the positioning groove. One end of the pressing block abuts against the trailing edge of the molded blade, and the other end abuts against the adjusting bolt. The adjusting bolt is threadedly connected to the trailing-edge limiting block.

9. The bearingless tail rotor blade integral drilling positioning device according to claim 6, wherein: The guiding holes are located on the center line of the narrow end of the base and three guiding holes are arranged side by side. The diameter of the guiding holes is 0.016 mm - 0.059 mm larger than the drilling diameter; 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 1 cm.

10. The bearingless tail rotor blade integral drilling positioning device according to claim 8, characterized in that: The materials of both the pressing block and the positioning seat include aluminum or nylon; two hanging rings are arranged at each end of the base.

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