Large-torsion-angle tail thrust blade foam core detection tool

Abstract

The utility model relates to the technical field of aerospace manufacturing, in particular to a large-torsion-angle tail thrust blade foam core detection tool. The detection tool comprises a die body, a positioning plate and a detection clamping plate assembly. A mold body is arranged on the positioning plate, and a cavity in the mold body follows the shape of an upper wing surface or a lower wing surface for accommodating a tail thrust paddle foam core; the inspection clamping plate assembly is installed on the positioning plate and stretches across the mold cavity of the mold body, the inspection clamping plate assembly is composed of a plurality of inspection clamping plates, each inspection clamping plate is provided with an inspection clamping groove used for inspecting different sections of the tail thrust paddle foam core, and the inspection clamping grooves are matched with the shape of the corresponding section of the other wing face.

Description

Technical Field

[0001] This utility model relates to the field of aerospace manufacturing technology, specifically to a testing fixture for foam core of a large-torsion tail thrust propeller. Background Technology

[0002] like Figures 1-2 As shown, the novel tail thrust rotor blade requires a large-twist-angle helical structure to meet its aerodynamic design requirements. Given the advantages of three-dimensional woven composite materials, such as strong design flexibility, resistance to delamination, and high fatigue expansion resistance, the development of the novel tail thrust rotor blade employs foam core mold woven skin and spars, along with RTM molding technology. Because the blade structure is a large-twist-angle helical structure, the corresponding foam core structure also exhibits a large twist angle and ultra-thin edges. Furthermore, the RTM molding process, unlike conventional blade compression molding, places more stringent requirements on the dimensional accuracy of the foam processing. If the foam exhibits deviations, it will affect the blade assembly and consequently the quality of the blade's RTM molding.

[0003] To ensure the quality of tail thruster blade assembly and RTM molding, it is necessary to enhance the accuracy of blade foam core inspection. Conventional blade foam, due to its relatively regular shape, is typically inspected by selecting several cross-sections, designing upper and lower clamps based on their cross-sectional shapes, and measuring the gap. A gap of ≤0.5mm is considered acceptable. However, due to the large twist angle structure of the tail thruster blade and its ultra-thin edges (the thinnest foam layer is only 0.5mm), the conventional foam clamping method cannot accurately position and measure the foam, and this clamping method easily leads to foam edge breakage. Therefore, a new fixture for inspecting the foam core of the large twist angle tail thruster blade needs to be designed to solve the problem of accurate measurement of the tail thruster blade foam core. Utility Model Content

[0004] Purpose of the utility model: To provide a testing fixture for foam core of tail thrust blades with large twist angles, enabling accurate measurement of foam cores in tail thrust blades with large twist angle structures and ultra-thin edges.

[0005] Technical solution

[0006] A testing fixture for foam core of a large-torsion tail thrust propeller is provided, comprising: a mold body, a positioning plate, and an inspection card assembly;

[0007] A mold is set on the positioning plate, and the cavity on the mold conforms to the shape of the upper or lower wing surface that accommodates the foam core of the tail thrust blade.

[0008] The inspection plate assembly is mounted on the positioning plate, spanning across the cavity of the mold body.

[0009] The inspection plate assembly consists of multiple inspection plates. Each inspection plate is equipped with inspection slots for inspecting different cross-sections of the tail thrust blade foam core. The shape of the inspection slots corresponds to the cross-section of another blade.

[0010] Furthermore, the tooling also includes: a positioning support assembly;

[0011] The inspection plate is fixed to the positioning plate by the positioning support assembly.

[0012] Furthermore, the tooling also includes eye bolts located at the four corners of the positioning plate;

[0013] Eye bolts are used for hoisting and testing the foam core of a large-torsion tail thrust propeller.

[0014] Furthermore, the mold body is made of 6061 aluminum alloy, and the positioning plate is made of Q235A material.

[0015] Furthermore, the inspection plate is made of stainless steel.

[0016] Furthermore, inspecting a tail thrust blade foam core requires the use of two large-torsion tail thrust blade foam core inspection fixtures.

[0017] Beneficial effects:

[0018] The foam testing fixture is simple to assemble and operate, breaking through conventional blade testing methods. It enables accurate detection of foam on ultra-thin tail thruster blades with high torque, effectively ensuring the accuracy of subsequent blade assembly and thus improving the quality of blade RTM forming. Attached Figure Description

[0019] Figure 1 This is a front view of the foam core of the tail thrust blade.

[0020] Figure 2 This is a side view of the foam core of the tail thrust blade.

[0021] Figure 3 This is a schematic diagram of a tooling for testing the foam core of a tail thrust propeller blade.

[0022] Figure 4 This is a cross-sectional view of the positioning support assembly.

[0023] Figure 5 This is a schematic diagram of the assembly of the foam core and the testing fixture. Detailed Implementation

[0024] This utility model provides a testing fixture for foam core of a large-torsion tail thrust propeller, such as... Figures 3-5 As shown, it includes: mold body 2, positioning plate 3, positioning support assembly 4, inspection plate assembly 5, and lifting eye screws 6 set at the four corners of the positioning plate;

[0025] A mold is set on the positioning plate. The cavity on the mold conforms to the shape of the upper or lower wing surface that accommodates the foam core of the tail thrust blade.

[0026] The inspection plate assembly is mounted on the positioning plate 3, spanning across the cavity of the mold body 2.

[0027] The inspection plate assembly consists of multiple inspection plates. Each inspection plate is equipped with inspection slots for inspecting different cross-sections of the tail thrust blade foam core. The shape of the inspection slots corresponds to the cross-section of another blade.

[0028] The positioning support assembly 4 includes a positioning support 7, a configuration bolt 8, a compression spring 9, a hexagonal thin nut 10, an internal hexagonal screw 12, and a cylindrical pin 11;

[0029] The support 7 includes a base and a support arm. The base is set on the positioning plate, and the support arm is installed on the base by hexagonal screws 12 and cylindrical pins 11. The inspection plate is installed on the side of the support arm near the root of the foam core by configuration bolts 8, compression springs 9 and hexagonal thin nuts 10.

[0030] The base is fixed to the positioning plate by cylindrical pins.

[0031] The inspection plate is fixed to the positioning plate 3 by a pair of positioning supports.

[0032] The eye bolt 6 is used for hoisting the testing fixture for the foam core of the tail thrust propeller with large twist angle.

[0033] The mold body 2 is made of aluminum alloy 6061, and the positioning plate 3 is made of Q235A material.

[0034] The inspection card is made of stainless steel.

[0035] Inspecting a tail thrust blade foam core requires the use of two large-torsion tail thrust blade foam core inspection fixtures.

[0036] The process of using a large-torsion tail thrust propeller foam core testing fixture for this utility model is as follows:

[0037] Step 1, based on the structure of the tail thruster blade foam 1, as follows: Figures 1-2 As shown, this structure features a large twist angle and ultra-thin edges. Based on this propeller foam core structure, the foam core tooling is designed as follows: Figure 3 As shown. The foam core fixture consists of a mold body 2, a positioning plate 3, a positioning support assembly 4, an inspection clamping plate assembly 5, and lifting eye screws 6. Unlike conventional foam clamping plate inspection, the mold body 2 is designed based on the foam core profile to provide support during foam inspection and prevent breakage. The mold body 2 is made of 6061 aluminum alloy, ensuring rigidity while reducing weight. The positioning plate 3 provides spanwise positioning for the foam core root and is made of Q235A material. The positioning support assembly 4 consists of a positioning support 7, a hook bolt 8, a compression spring 9, a hexagonal thin nut 10, a cylindrical pin 11, and an internal hexagonal screw 12. Figure 4The diagram shown is a cross-sectional view of the positioning support assembly, which serves to clamp and position the inspection clamp. Figure 4 This is a cross-sectional view of the positioning support. Inspection clamp assembly 5 consists of 9 inspection clamps designed for 19 different cross-sections of the paddle foam core. The inspection clamps are made of 2mm stainless steel. Eye bolts 6 are used for easy handling of the foam testing fixture.

[0038] Step 2: Clean the foam core inspection fixture with acetone. First, install the support assembly 4 on the front and rear edges of the mold body. Position the positioning support 7 on the mold body 2 using cylindrical pins 11 and internal hexagonal screws 12. Then, install hook bolts 8, compression springs 9, and hexagonal thin nuts 10 on the positioning support.

[0039] Step 3: Place the foam core 1. Fit the foam core 1 onto the surface of the mold body 2 according to its shape. Then install the positioning plate 3 to position and fix the propeller root of the foam core 1.

[0040] Step 4: Assemble the inspection card assembly 5 onto the positioning support assembly 4. Specifically, assemble the first inspection card 501, second inspection card 502, third inspection card 503, fourth inspection card 504, fifth inspection card 505, sixth inspection card 506, seventh inspection card 507, eighth inspection card 508, and ninth inspection card 509 sequentially onto their corresponding positioning support assemblies 4. Position them using cylindrical pins 11. Attach the inspection card to the surface of the positioning support 7, and then align the inspection card surface with the upper surface of the foam core. Finally, tighten the hook bolts 8 for fixation. After completing the assembly of the foam core and testing fixtures, as follows... Figure 5 As shown, feeler gauges were used to measure the gap between the nine cross-section inspection plates and the foam core. If the foam core completely fits the mold surface and the gap value is ≤0.2mm, the foam core is considered to be a qualified part. Otherwise, it needs to be properly filed or remade until the inspection requirements are met.

Claims

1. A large skew tail pusher blade foam core inspection fixture, characterized by, The utility model relates to a kind of tail propeller blade foam core detection tooling, including: Mould (2), positioning plate (3), test card plate assembly (5); Mould is arranged on positioning plate, the cavity on mould is shaped with the upper or lower surface profile of the tail propeller blade foam core; Test card plate assembly is installed on positioning plate (3), and it is across the cavity of mould (2), Test card plate assembly is made of multiple test card plates, and each test plate is provided with test card slot for testing different sections of tail propeller blade foam core, and test card slot is shaped with the profile of the corresponding section of another surface.

2. The tooling of claim 1, wherein, Further including: Positioning support assembly (4); Test card plate is fixed on positioning plate (3) by positioning support assembly (4).

3. The tooling of claim 1, wherein, Further including: Lifting eye bolt (6) is arranged in the four corners of positioning plate; Lifting eye bolt (6) is used for lifting large torsion angle tail propeller blade foam core detection tooling.

4. The tooling of claim 1, wherein, Mould (2) is made of aluminum alloy 6061 material, and positioning plate (3) is made of Q235A material.

5. The tooling of claim 2 wherein, Test card plate is stainless steel plate.

6. The tooling of claim 1 wherein, To detect a tail propeller blade foam core, two large torsion angle tail propeller blade foam core detection toolings are needed.

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