A blade forming process method and a blade root structure for improving blade forming quality

Abstract

The present invention discloses a blade molding process method and a blade root structure for improving the blade molding quality, wherein the blade root structure includes a blade root inner sleeve, an inverted wedge cloth layer, a carbon beam layer and a blade root outer sleeve, and through the blade molding process method, a multi-layer carbon beam layer is reserved for an extension section at the blade root end; the blade root inner sleeve is connected to the blade structure, and the multi-layer carbon beam layer is wrapped on the outside of the blade root inner sleeve to form the blade root structure; inverted wedges are formed between every two carbon beam layers at the injection molding end of the blade root structure, and notches cut out between the inverted wedge cloth layers form a loose structure with gaps, and the gaps form a glue injection channel connected to the blade structure, and resin enters the blade root inner sleeve from here and flows into the blade body, so that the inverted wedge at the blade root is avoided from being tightly entangled with the blade structure and the tooling structure, and under the combined effect, a phenomenon occurs in which part of the resin flow channel enters the blade body along the blade root outer sleeve, so as to avoid blade delamination and improve the blade quality.

Description

Technical Field

[0001] The invention relates to the field of propeller blade injection molding, and more particularly to a blade molding process method and a blade root structure for improving the blade molding quality. Background Art

[0002] After the propeller blades are injected with resin, due to problems with the injection channel, the blades often become delaminated and delaminated near the root of the blades. In addition, the dry cloth will fall off at the end of laying, resulting in poor quality of the propeller blades and low yield.

[0003] Therefore, how to provide a process method that can improve the injection molding quality of propeller blades is an urgent problem that technical personnel in this field need to solve. Summary of the invention

[0004] In view of this, the present invention aims to provide a blade forming process method to at least solve one of the above-mentioned technical problems in the prior art to a certain extent.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A blade forming process method, characterized by comprising the following process flow:

[0007] Step 1: Process the inverted wedge cloth layer and cut a notch in the inverted wedge cloth layer;

[0008] Step 2: Laying fiber cloth layers and carbon beam layers, laying multiple layers of fiber cloth and carbon beam layers in a forming mold to form a blade structure; the multiple layers of carbon beam layers are reserved with an extension section at the blade root end;

[0009] Step 3: Install the inner sleeve at the blade root, connect the inner sleeve at the blade root with the blade structure, wrap the multiple carbon beam layers around the outer portion of the inner sleeve at the blade root to form a blade root structure; arrange the outer sleeve at the blade root on the outer side of the blade root structure and pull it toward the side close to the blade structure, and reserve a blade root extension section at the injection molding end of the blade root structure;

[0010] At the position of the blade root extension section, multiple layers of inverted wedge cloth layers are wound between every two layers of the carbon beam to form an inverted wedge, and the blade root jacket is pulled toward one side of the blade root extension section, so that the blade root jacket and the blade root extension section are in an interference fit; the notches cut out between the inverted wedge cloth layers form a loose structure with a gap, and the gap forms a glue injection channel connected to the blade structure;

[0011] Step 4: Injection molding: align and install the propeller root extension section with the injection tooling of the RTM injection molding machine, and then perform injection molding;

[0012] Step 5: Cut off the propeller root extension section. After the injection molding is completed, remove the propeller root extension section by milling to meet the design requirements.

[0013] It can be seen from the above technical solution that, compared with the prior art, the advantages of the present invention are:

[0014] Multiple layers of carbon beam layers are wrapped around the outside of the inner sleeve of the blade root to form a blade root structure; at the injection molding end of the blade root structure, multiple layers of inverted wedge cloth layers are wound between every two layers of carbon beam layers to form an inverted wedge. Since the inverted wedge cloth layer is cut with a notch, the cloth layer at the injection molding end of the blade root structure is relatively loose, forming an injection molding channel, and the resin flows into the blade structure from here through the injection molding channel, avoiding the inverted wedge cloth layer at the blade root and the blade structure and tooling structure being tightly wound. Under the combined effect, part of the resin flow path enters the blade structure along the blade root jacket, thereby avoiding blade delamination and improving the blade quality. After the injection molding is completed, the blade root extension section is removed by milling to meet the design requirements, which increases the milling process flow, but the operation is simple and easy to operate, and can ensure high-quality production of propeller blades.

[0015] A blade root structure for improving the quality of blade forming, comprising a blade root inner sleeve, an inverted wedge cloth layer, a carbon beam layer and a blade root outer sleeve; the inverted wedge cloth layer is cut with a notch;

[0016] The carbon beam layer is provided with multiple layers, all of which are sleeved on the outside of the blade root inner sleeve to form a blade root structure. At the injection molding end of the blade root structure, multiple layers of the inverted wedge cloth layers are wound between every two layers of the carbon beam layers to form an inverted wedge, and the gaps between the inverted wedge cloth layers form an injection molding channel. The blade root outer sleeve is sleeved on the outside of the blade root structure, and a blade root extension section is reserved at the end.

[0017] Preferably, in the above-mentioned paddle root structure for improving the molding quality of the blade, the end of the paddle root structure is connected to the blade structure, and the injection channel inside the paddle root structure is connected to the internal channel of the blade structure.

[0018] It can be seen from the above technical solution that, compared with the prior art, the advantage of the present invention is that by adopting this structure and then performing injection molding operations, the stratification phenomenon of the blades and the blade roots can be avoided, thereby greatly improving the quality of the propeller blades. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0020] Figure 1 The accompanying drawing is a schematic diagram of the structure of Example 2 of the present invention;

[0021] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0022] Figure 3 The accompanying drawing is a side view of Example 2 of the present invention. DETAILED DESCRIPTION

[0023] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0024] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Example 1

[0027] A blade forming process method includes the following process flow:

[0028] Step 1: Process the inverted wedge cloth layer and cut a notch in the inverted wedge cloth layer;

[0029] Step 2: Laying fiber cloth layers and carbon beam layers, laying multiple layers of fiber cloth and carbon beam layers in a forming mold to form a blade structure; the multiple layers of carbon beam layers are reserved with an extension section at the blade root end;

[0030] Step 3: Install the inner sleeve at the blade root, connect the inner sleeve at the blade root with the blade structure, wrap the multiple carbon beam layers around the outer portion of the inner sleeve at the blade root to form a blade root structure; arrange the outer sleeve at the blade root on the outer side of the blade root structure and pull it toward the side close to the blade structure, and reserve a blade root extension section at the injection molding end of the blade root structure;

[0031] At the position of the blade root extension section, multiple layers of inverted wedge cloth layers are wound between every two layers of the carbon beam to form an inverted wedge, and the blade root jacket is pulled toward one side of the blade root extension section, so that the blade root jacket and the blade root extension section are in an interference fit; the notches cut out between the inverted wedge cloth layers form a loose structure with a gap, and the gap forms a glue injection channel connected to the blade structure;

[0032] Step 4: Injection molding: align and install the propeller root extension section with the injection tooling of the RTM injection molding machine, and then perform injection molding;

[0033] Step 5: Cut off the propeller root extension section. After the injection molding is completed, remove the propeller root extension section by milling to meet the design requirements.

[0034] Example 2

[0035] Please see attached Figure 1-3 The invention discloses a blade root structure for improving the quality of blade forming, comprising a blade root inner sleeve 1, an inverted wedge cloth layer 2, a carbon beam layer 3 and a blade root outer sleeve 4; the inverted wedge cloth layer 2 is cut with a notch;

[0036] The carbon beam layer 3 is provided with multiple layers, all of which are sleeved on the outside of the blade root inner sleeve 1 to form a blade root structure. At the injection molding end of the blade root structure, multiple layers of inverted wedge cloth layers 2 are wound between every two layers of the carbon beam layers 3 to form an inverted wedge, and the gaps between the inverted wedge cloth layers 2 form an injection molding channel 5. The blade root outer sleeve 4 is sleeved on the outside of the blade root structure, and a blade root extension section is reserved at the end.

[0037] In order to further optimize the above technical solution, the end of the root structure is connected to the blade structure 6 , and the injection channel 5 inside it is connected to the internal channel of the blade structure 6 .

[0038] Specifically, the propeller root sleeve 4 and the propeller root extension section are in interference fit.

[0039] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0040] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be 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 will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A blade forming process, characterized in that: Including the following process: Step 1: Process the inverted wedge cloth layer and cut a notch in the inverted wedge cloth layer; Step 2: Laying fiber cloth layers and carbon beam layers, laying multiple layers of fiber cloth and carbon beam layers in a forming mold to form a blade structure; the multiple layers of carbon beam layers are reserved with an extension section at the blade root end; Step 3: Install the inner sleeve at the blade root, connect the inner sleeve at the blade root with the blade structure, wrap the multiple carbon beam layers around the outer portion of the inner sleeve at the blade root to form a blade root structure; arrange the outer sleeve at the blade root on the outer side of the blade root structure and pull it toward the side close to the blade structure, and reserve a blade root extension section at the injection molding end of the blade root structure; At the position of the blade root extension section, multiple layers of inverted wedge cloth layers are wound between every two layers of the carbon beam to form an inverted wedge, and the blade root jacket is pulled toward one side of the blade root extension section, so that the blade root jacket and the blade root extension section are in an interference fit; the notches cut out between the inverted wedge cloth layers form a loose structure with a gap, and the gap forms a glue injection channel connected to the blade structure; Step 4: Injection molding: align and install the propeller root extension section with the injection tooling of the RTM injection molding machine, and then perform injection molding; Step 5: Cut off the propeller root extension section. After the injection molding is completed, remove the propeller root extension section by milling to meet the design requirements.

2. A blade root structure for improving the quality of blade forming, characterized in that: It comprises a blade root inner sleeve (1), an inverted wedge cloth layer (2), a carbon beam layer (3) and a blade root outer sleeve (4); the inverted wedge cloth layer (2) is cut with a notch; The carbon beam layer (3) is provided with multiple layers, all of which are sleeved on the outside of the blade root inner sleeve (1) to form a blade root structure. At the injection molding end of the blade root structure, multiple layers of the inverted wedge cloth layers (2) are wound between every two layers of the carbon beam layer (3) to form an inverted wedge, and the gaps between the inverted wedge cloth layers (2) form an injection molding channel (5). The blade root outer sleeve (4) is sleeved on the outside of the blade root structure, and a blade root extension section is reserved at the end.

3. The blade root structure for improving the blade forming quality according to claim 2, characterized in that: The end of the paddle root structure is connected to the paddle blade structure (6), and the injection channel (5) inside the paddle root structure is connected to the internal channel of the paddle blade structure (6).

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