Integrated iron-clad bonding auxiliary clamp for front edge of rotor blade

Abstract

The utility model provides a rotor blade front edge integrated iron-clad bonding auxiliary clamp which comprises a fixture used for installing a blade body and assisting the chord line of the blade body to be perpendicular to the horizontal plane; the check block is arranged at the bottom end of the fixture, the check block is used for supporting the front edge of the supporting paddle body, and the shape of the check block is matched with that of the front edge of the paddle body; wherein the wrapping iron is arranged on the inner surface of the check block, the paddle body is installed in the fixture, the chord line of the paddle body is perpendicular to the horizontal plane, and the wrapping iron is attached to the front edge of the paddle body by means of the gravity of the paddle body; according to the method, the problems that the large-size clad iron and the composite blade profile are poor in fitting degree and non-uniform in glue joint are solved, and the bonding quality of the clad iron is improved.

Description

Technical Field

[0001] This application belongs to the technical field of helicopter auxiliary fixtures, and particularly relates to an auxiliary fixture for integrally bonding the leading edge of a rotor blade with an iron wrap. Background Art

[0002] Currently, stainless steel iron wraps are assembled on the leading edges of various types of helicopter blades. The main function is to prevent the blade body from being damaged by the high-speed rotation of the blade, which rolls up ground sand and gravel during flight. At the same time, the leading edge iron wrap has a relatively large stiffness and is difficult to deform. To ensure the bonding strength, when the adhesive layer is thin, a large uniform pressure needs to be applied during bonding.

[0003] In traditional iron wrap bonding, in order to make the iron wrap fit the blade profile as much as possible, bow-shaped clamps are used for pressing. However, the pressure applied by the bow-shaped clamp is generally a point pressure, which is easy to cause clamping damage to the blade body, and is only applicable to iron wraps with relatively small sizes. For large-sized integrally bonded iron wraps with a span length exceeding 7m, if bow-shaped clamps are still used for pressing, it is extremely easy to cause uneven local pressure, resulting in serious bonding quality defects such as bonding voids between the iron wrap and the blade interior, air not being discharged, excess adhesive not being extruded, and bonding cracking.

[0004] Therefore, it is necessary to improve the existing bonding method for the integrally bonded iron wrap on the leading edge of the blade, and design an auxiliary fixture for integrally bonding the leading edge of a rotor blade with an iron wrap. Utility Model Content

[0005] Purpose of this application: An auxiliary fixture for integrally bonding the leading edge of a rotor blade with an iron wrap provided by this application solves the problems of poor fit between the large-sized iron wrap and the composite blade profile and uneven bonding, and improves the bonding quality of the iron wrap.

[0006] An auxiliary fixture for integrally bonding the leading edge of a rotor blade with an iron wrap provided by this application, the fixture includes:

[0007] A jig for installing the blade body and assisting the chord line of the blade body to be perpendicular to the horizontal plane;

[0008] A stop block is arranged at the bottom end of the jig, and the stop block is used to support the leading edge of the blade body, and the shape of the stop block is adapted to the leading edge of the blade body;

[0009] Wherein, the iron wrap is arranged on the inner surface of the stop block, the blade body is installed in the jig, the chord line of the blade body is perpendicular to the horizontal plane, and relying on the gravity of the blade body itself, the iron wrap fits on the leading edge of the blade body.

[0010] Preferably, an adhesive is applied to the inner surface of the iron wrap that fits the leading edge of the blade body.

[0011] Preferably, the fixture further includes:

[0012] A cowhide pad is disposed between the stop block and the iron wrapping. The cowhide pad is used to prevent the blade body from slipping or being bruised.

[0013] Preferably, the shape of the iron wrapping matches the leading edge of the blade body.

[0014] Preferably, the jig includes:

[0015] A first frame, one end of the first frame is connected to the stop block;

[0016] A second frame, one end of the second frame is connected to the stop block;

[0017] A tightening screw, which can connect the other end of the first frame to the other end of the second frame; the tightening screw can also adjust the position of the blade body.

[0018] Preferably, the fixture further includes:

[0019] An inspection truss, which is used to inspect whether the chord line of the blade body is perpendicular to the horizontal plane. The inspection truss is disposed on the inner surface of the first frame;

[0020] Wherein, by adjusting the tightening screw until the top end of the blade body fits against the lower surface of the inspection truss, it indicates that the chord line of the blade body is perpendicular to the horizontal plane.

[0021] Preferably, the fixture further includes:

[0022] An auxiliary inspection support part is disposed on the inner surfaces of the first frame and the second frame. The auxiliary inspection support part is used to assist in inspecting whether the chord line of the blade body is perpendicular to the horizontal plane and to assist in supporting the blade body.

[0023] Advantageous technical effects of the present application:

[0024] The auxiliary fixture for the integrated iron wrapping bonding at the leading edge of the rotor blade provided by the present application belongs to a portable and detachable tooling, which can achieve flexible pressurization, solves the problem of uniform pressurization for large curved surfaces, greatly improves the bonding quality, and ensures the smooth implementation of the bonding process for the large-sized integrated iron wrapping at the leading edge and the blade. Description of the Drawings

[0025] Figure 1 It is a schematic structural diagram of an auxiliary fixture for the integrated iron wrapping bonding at the leading edge of a rotor blade provided by an embodiment of the present application. Detailed Embodiment

[0026] An auxiliary fixture provided by the present application is specifically used for the bonding of the integrated iron wrapping at the leading edge of the rotor blade. The auxiliary fixture mainly consists of a stop block 1, a cowhide pad 2, a jig 3, a tightening screw 4, an inspection truss 5, and a blade body 6, as specifically shown in Figure 1 as follows.

[0027] Among them, the stop block 1 is made of stainless steel with a smooth inner surface and a flat bottom, which can be placed flat on the ground. Its outer shape is "U"-shaped and fits the leading edge of the blade. To prevent the blade from slipping and being bruised, a 2-mm-thick cowhide pad 2 is laid on the inner surface of the stop block. The jig 3 is lightened in weight and made of aluminum alloy with a hollow middle. It selects the cross-sectional contour of the chordwise shape of the blade and adopts a point-contact method to fit the upper and lower wing surfaces of the blade (to ensure uniform pressure, an auxiliary fixture can be added every 1000 mm along the spanwise position of the blade). The tightening screw 4 mainly plays the role of fixing and disassembling the fixture, and the position of the trailing edge of the blade can be adjusted by adjusting the tightening torque. There is a scale line (reference line) below the inspection truss 5. When the trailing edge of the blade coincides with the scale line by adjusting the tightening torque of the tightening screw, it can ensure that the chord line of the blade airfoil is perpendicular to the ground plane, thus ensuring that the blade body is vertically placed. Under the weight of the blade itself, the iron wrapping and the leading edge of the blade can achieve flexible pressurization, and the bonding quality is good.

[0028] The auxiliary fixture for the bonding of the integrated iron wrapping at the leading edge of the rotor blade designed by the present application belongs to a portable and detachable tooling, which can achieve flexible pressurization, solves the problem of uniform pressurization of large curved surfaces, greatly improves the bonding quality, and ensures the smooth implementation of the bonding process of the large-size integrated iron wrapping at the leading edge and the blade.

[0029] In a feasible implementation manner, the specific process is as follows:

[0030] (1) Arrange multiple auxiliary fixtures in sequence according to the spanwise position of the blade to be bonded, open the tightening screw, and place the blade to be bonded into the fixture, keeping the leading edge facing down and the trailing edge facing up;

[0031] (2) Appropriately adjust the placement position of the blade to be bonded to ensure that the leading edge abuts against the stop block and the upper and lower wing surfaces abut against the jig. Select a feeler gauge to detect the abutting gap between the dimensions. When the abutting gap ≤ 0.2 mm, the next step can be carried out;

[0032] (3) Adjust the tightening torque of the tightening screw so that the trailing edge of the blade to be bonded abuts against the reference line of the blade truss to ensure that the blade body to be bonded is perpendicular to the ground plane;

[0033] (4) Put the blade to be bonded and the auxiliary fixture into the curing furnace together. The curing furnace heats up, and the weight of the blade itself applies pressure to cure the blade to be bonded.

Claims

1. An auxiliary fixture for integrally bonding the leading edge iron of a rotor blade, characterized in that The fixture includes: A jig for mounting the blade body and assisting the chord line of the blade body to be perpendicular to the horizontal plane; A stop block provided at the bottom end of the jig, the stop block being used to support the leading edge of the blade body, and the shape of the stop block being adapted to the leading edge of the blade body; Wherein, a ferrule is arranged on the inner surface of the stop block, the blade body is mounted in the jig, the chord line of the blade body is perpendicular to the horizontal plane, and relying on the self-gravity of the blade body, the ferrule fits on the leading edge of the blade body.

2. The fixture according to claim 1, characterized in that, An adhesive is applied to the inner surface of the ferrule that fits the leading edge of the blade body.

3. The fixture according to claim 2, characterized in that, The fixture further includes: A cowhide pad provided between the stop block and the ferrule, the cowhide pad being used to prevent the blade body from slipping or being bruised.

4. The jig according to claim 3, wherein The shape of the ferrule is adapted to the leading edge of the blade body.

5. The fixture according to claim 1, characterized in that, The jig includes: A first frame, one end of the first frame being connected to the stop block; A second frame, one end of the second frame being connected to the stop block; A tightening screw capable of connecting the other end of the first frame to the other end of the second frame; the tightening screw can also adjust the position of the blade body.

6. The fixture according to claim 5, characterized in that, The fixture further includes: An inspection truss for inspecting whether the chord line of the blade body is perpendicular to the horizontal plane, the inspection truss being provided on the inner surface of the first frame; Wherein, adjust the tightening screw until the top end of the blade body fits the lower surface of the inspection truss, indicating that the chord line of the blade body is perpendicular to the horizontal plane.

7. The fixture according to claim 6, characterized in that, The fixture further includes: An auxiliary inspection support portion provided on the inner surfaces of the first frame and the second frame, the auxiliary inspection support portion being used to assist in inspecting whether the chord line of the blade body is perpendicular to the horizontal plane and to assist in supporting the blade body.

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