Preforming tool for helicopter tail rotor blade root

Abstract

The utility model discloses a helicopter tail rotor blade root preforming tool which comprises a bottom die, a central pillow block is arranged at the top of the bottom die, a protruding molded surface is arranged at the end of the central pillow block, a plurality of receding holes are formed in the periphery, corresponding to the protruding molded surface, of the central pillow block, and the bottom ends of the receding holes extend to the bottom face of the bottom die. The forming pin is fixed in the avoiding hole, and the top of the forming pin extends out of the top surface of the central pillow block; a supporting frame is connected to the bottom die through bolts, the top of the supporting frame is in threaded connection with an adjusting screw, and the bottom of the adjusting screw is connected with a pressing plate. A cavity hole matched with the central pillow block is formed in the top die, the pressing plate abuts against the top die and provides die assembly pressure, a product is formed between the cavity hole and the central pillow block in a compression molding mode, and the tail rotor blade root forming device is simple in structure, convenient to use and capable of forming a tail rotor blade root in advance.

Description

Technical Field

[0001] The utility model belongs to the technical field of aviation product molding, and in particular relates to a preforming tool for a helicopter tail rotor blade root. Background Art

[0002] The tail rotor is a crucial component of a helicopter. Mounted at the tail, its rotation generates a force that counteracts the counter-torque generated by the main rotor. By varying the force, the helicopter's heading can be controlled, making it more stable and maneuverable during flight. However, direct press-molding of the tail rotor blades at the root can easily lead to defects, failing to meet design requirements and thus impacting subsequent production.

[0003] Therefore, how to provide a preformed tooling for a helicopter tail rotor blade root is a problem that those skilled in the art urgently need to solve. Utility Model Content

[0004] In view of this, the utility model provides a preforming tool for the root of a helicopter tail rotor blade, which can preform the root part of the blade to ensure the quality of subsequent products.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solution: a preformed tooling for a helicopter tail rotor blade root, comprising:

[0006] A bottom mold, wherein a center shaft platform is provided on the top of the bottom mold, a convex profile is provided on the end of the center shaft platform, and a plurality of avoidance holes are provided on the outer periphery of the center shaft platform corresponding to the convex profile, and the bottom ends of the avoidance holes extend to the bottom surface of the bottom mold;

[0007] A forming pin, the forming pin being fixed in the avoidance hole and the top of the forming pin extending out of the top surface of the central shaft platform;

[0008] A support frame, wherein the support frame is bolted to the bottom mold, the top of the support frame is threadedly connected to an adjusting screw, and the bottom of the adjusting screw is connected to a pressing plate;

[0009] The top mold is provided with a cavity hole that matches the central shaft platform. The pressure plate abuts against the top mold and provides mold closing pressure. The product is molded between the cavity hole and the central shaft platform.

[0010] The technical effect of this utility model is that the center axis table serves as the core mold, and the cavity in the top mold cooperates with the center axis table to mold the product. The clamping pressure is provided by the pressure plate, thereby meeting the clamping pressure requirement. The purpose of the molding pin is to provide the connection hole on the molded product, facilitating subsequent product processing. In actual use, the pressure plate can be raised and lowered relative to the support frame by turning the adjustment screw, thereby providing the clamping pressure.

[0011] Preferably, a guide slot is provided on one side edge of the bottom mold, and an angular positioning pin is fixed on one side of the cavity of the top mold. The angular positioning pin is slidably connected in the guide slot and limits the angular position relationship between the top mold and the bottom mold.

[0012] The resulting technical effect is that the guide groove actually limits the angular position of the top mold and the bottom mold, thereby completing the precise mold closing and pressurizing process.

[0013] Preferably, the support frame is a door-type frame, and bolt connection seats are provided at both ends of the support frame. Open grooves are provided on the bolt connection seats, and bolts are connected between the bolt connection seats and the bottom mold.

[0014] The resulting technical effect is that compared with traditional bolt holes, the open slot has a wider adjustment range and lower restrictions, and is also convenient for disassembly and position adjustment of the support frame, and the support frame can be disassembled without completely unscrewing the bolts.

[0015] Preferably, a screw hole is provided in the middle of the support frame, the adjusting screw is threadedly connected in the screw hole, and force rods are provided on both sides of the adjusting screw to facilitate the turning of the adjusting screw. The rotation of the adjusting screw causes it to rise and fall relative to the support frame.

[0016] The resulting technical effect is: the screw hole on the support frame is used to thread the adjusting screw, and when the adjusting screw is rotated, axial displacement will be generated, thereby realizing the lifting or pressing down action of the pressure plate. The setting of the force rod makes the force adjustment more labor-saving.

[0017] Preferably, a central connecting hole is provided on the pressure plate, the pressure plate is slidably connected to the support frame, the bottom of the adjusting screw is rotatably connected to a connecting head, and the connecting head is threadedly connected to the central connecting hole.

[0018] The resulting technical effect is that the threaded cooperation between the pressure plate and the connector prevents it from falling out during use, ensuring normal use; the up and down sliding of the pressure plate relative to the support frame can also improve the pressure stability of the pressure plate.

[0019] Preferably, a plurality of demolding grooves are provided at the four corners of the bottom of the top mold.

[0020] The resulting technical effect is that the demoulding groove facilitates the subsequent demoulding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is an overall structural diagram of a preformed tooling for a helicopter tail rotor blade root according to the present invention;

[0022] Figure 2 This is a processing product diagram of a preformed tooling for a helicopter tail rotor blade root according to the utility model.

[0023] 1 bottom mold, 2 center axis platform, 3 raised surface, 4 avoidance hole, 5 forming pin, 6 support frame, 7 adjusting screw, 8 pressure plate, 9 top mold, 10 cavity hole, 11 angular positioning pin, 12 bolt, 13 opening groove, 14 guide notch, 15 connector, 16 demoulding groove. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] See the attached Figures 1 to 2 The present invention provides a preformed tool for a helicopter tail rotor blade root, which includes:

[0026] A bottom mold 1 is provided with a center shaft platform 2 on the top of the bottom mold 1, a raised profile 3 is provided at the end of the center shaft platform 2, and four avoidance holes 4 are provided on the outer periphery of the center shaft platform 2 corresponding to the raised profile 3, and the bottom ends of the avoidance holes 4 extend to the bottom surface of the bottom mold 1;

[0027] There are four molding pins 5, each of which is fixed in the avoidance hole 4 and its top extends out of the top surface of the center shaft platform 2, which provides a core foundation for the connecting batch holes on the product;

[0028] The support frame 6 is fixedly connected to the bottom mold 1 with bolts. The support frame 6 is a door-type frame, and its suspended top is threadedly connected to an adjusting screw 7, and the bottom of the adjusting screw 7 is connected to a pressure plate 8;

[0029] The top mold 9 is provided with a cavity 10 that matches the center axis table. The pressure plate 8 abuts against the top mold 9 and provides mold closing pressure. The product is molded between the cavity 10 and the center axis table 2. During specific implementation, the cavity and the outer periphery of the center axis table are clearance-matched to facilitate mold opening and ensure product accuracy.

[0030] In other embodiments, a guide groove 14 is provided on one side edge of the bottom mold 1, and a mounting hole is provided on one side of the cavity 10 of the top mold 9. An angular positioning pin 11 is interference fit in the mounting hole. The angular positioning pin 11 is clearance fit with the guide groove 14 and limits the angular position relationship between the top mold 9 and the bottom mold 1.

[0031] In other specific embodiments, bolt connection seats are provided at both ends of the support frame 6, and open grooves 13 are provided at the side ends of the bolt connection seats. Bolts 12 are connected between the bolt connection seats and the bottom mold 1. The open grooves facilitate the assembly of the bolt connection seats and the bolts, and also facilitate the adjustment of the positional relationship between the support frame and the bottom mold.

[0032] In some other embodiments, a screw hole is opened in the middle of the support frame 6, and the adjusting screw 7 is threadedly connected in the screw hole. There are force rods on both sides of the adjusting screw 7 to facilitate the turning of the adjusting screw. The rotation of the adjusting screw 7 causes it to rise and fall relative to the support frame 6. The force rod facilitates the operator to turn the adjusting screw, thereby facilitating the pressing and lifting of the pressure plate.

[0033] In some other specific embodiments, a central connecting hole is provided on the pressure plate 8, the pressure plate 8 is slidingly connected to the support frame 6, the bottom of the adjusting screw 7 is rotatably connected to a connecting head 15, and the connecting head 15 is threadedly connected to the central connecting hole, thereby making the relative position relationship between the pressure plate and the adjusting screw, and the pressure plate is not easy to fall off during use.

[0034] It should be noted that a plurality of demoulding grooves 16 are provided around the bottom of the top mold to facilitate demoulding.

[0035] Usage process:

[0036] First, open the top and bottom molds, lay the prepreg layer on the mold surface of the center pedestal, cut, flatten, and compact the composite material layer, and then close the top mold, ensuring that the angular positioning pins and guide slots are guided and positioned during mold closing. Next, tighten the bolts on the support frame to fix it to the bottom mold. At this time, the pressure plate is located above the top mold. Turn the adjustment screw to cause it to move axially up and down. The adjustment screw drives the pressure plate downward, thereby pressurizing the top mold, compacting the prepreg, and ensuring that the mold gap between the top and bottom molds is no more than 0.1mm.

[0037] After holding the pressure for a certain period of time, loosen the bolts and adjusting screws, remove the support frame and the pressure plate assembly from the side. Use the mold opening groove to pry open the top mold and remove the pre-pressed part. The operation is completed.

[0038] As for the devices and methods of use disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the methods.

[0039] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A preformed tool for a helicopter tail rotor blade root, characterized in that: include: A bottom mold (1), wherein a center shaft platform (2) is provided at the top of the bottom mold (1), a convex profile (3) is provided at the end of the center shaft platform (2), and a plurality of avoidance holes (4) are provided on the outer periphery of the center shaft platform (2) corresponding to the convex profile (3), and the bottom ends of the avoidance holes (4) extend to the bottom surface of the bottom mold (1); A forming pin (5), wherein the forming pin (5) is fixed in the avoidance hole (4) and the top of the forming pin extends out of the top surface of the central shaft platform (2); A support frame (6), the support frame (6) is fixedly connected to the bottom mold (1), the top of the support frame (6) is threadedly connected to an adjusting screw (7), and the bottom of the adjusting screw (7) is connected to a pressing plate (8); A top mold (9) is provided with a cavity (10) that matches the center shaft platform. The pressure plate (8) abuts against the top mold (9) and provides mold closing pressure. The product is molded between the cavity (10) and the center shaft platform (2).

2. The preformed tooling for a helicopter tail rotor blade root according to claim 1, characterized in that: A guide slot (14) is provided on one side edge of the bottom mold (1), and an angular positioning pin (11) is fixed on one side of the top mold (9) located in the cavity (10). The angular positioning pin (11) is slidably connected in the guide slot (14) and limits the angular position relationship between the top mold (9) and the bottom mold (1).

3. The preformed tooling for a helicopter tail rotor blade root according to claim 1, characterized in that: The support frame (6) is a door-type frame, and bolt connection seats are provided at both ends of the support frame (6). Open slots (13) are provided on the bolt connection seats, and bolts (12) are connected between the bolt connection seats and the bottom mold (1).

4. The preformed tooling for a helicopter tail rotor blade root according to claim 1, characterized in that: A screw hole is provided in the middle of the support frame (6), and the adjusting screw (7) is threadedly connected in the screw hole. Force rods are provided on both sides of the adjusting screw (7) for facilitating the screwing of the adjusting screw. The rotation of the adjusting screw (7) causes it to rise and fall relative to the support frame (6).

5. The preformed tooling for a helicopter tail rotor blade root according to claim 1, characterized in that: The pressing plate (8) is provided with a central connecting hole, the pressing plate (8) is slidably connected to the support frame (6), the bottom of the adjusting screw (7) is rotatably connected to a connecting head (15), and the connecting head (15) is threadedly connected in the central connecting hole.

6. The preformed tooling for a helicopter tail rotor blade root according to claim 1, characterized in that: The four corners of the bottom of the top mold (9) are provided with a plurality of demoulding grooves (16).

Images