Pultrusion structure of wind power blade root swivel nut prefabricated part

Abstract

The utility model relates to the technical field of wind power blade production, in particular to a pultrusion structure of a wind power blade root threaded sleeve prefabricated member, which is characterized in that a spliced mandrel is matched with reinforced fibers to obtain a threaded sleeve profile through a pultrusion production line, and then the threaded sleeve profile is cut to obtain a blade root threaded sleeve, so that the continuous production of the blade root threaded sleeve is realized. According to the blade root threaded sleeve of the pultrusion structure, the production procedure of prefabricating the blade root is omitted, continuous production of the blade root threaded sleeve is achieved through the pultrusion technology, the production cost is greatly reduced, the production efficiency is improved, and meanwhile the forming procedure of the blade root threaded sleeve is simplified. The core shaft is composed of a threaded sleeve assembly and a core rod which are alternately arranged, two metal threaded sleeves which are oppositely arranged in the threaded sleeve assembly are connected through a connector clip, the two metal threaded sleeves are convenient to mount and dismount, meanwhile, plugs are arranged at the tail ends, away from the connector clip, of the metal threaded sleeves, effective sealing of the metal threaded sleeves is achieved, and the sealing performance of the threaded sleeve assembly is enhanced. The core bar is connected with the plug through the connecting assembly, so that the splicing structure of the mandrel is simple and convenient to operate.

Description

Technical Field

[0001] The utility model relates to the technical field of wind turbine blade production, in particular to a wind turbine blade root screw sleeve prefabricated part pultrusion structure. Background Art

[0002] Wind power generation is the conversion of wind energy into electrical energy through wind turbines. Blades are one of the core components of wind turbines. The embedded sandwich structure at the root of the blades provides overall rigidity for the wind turbine blades. The root bolt sleeve assembly is one of the important components for connecting the blades to the hub. The traditional manufacturing method is to use vacuum infusion technology to connect the bolt sleeve to the core rod and arrange the wedge strips on both sides along the circumference of the mold, and then use vacuum infusion technology to cure and shape the relevant fiber yarns and multi-axial fabrics.

[0003] When the root bolt sleeve assembly is prepared by the traditional vacuum infusion process, the gaps and spacings between the components are difficult to ensure to be consistent after preparation, and defects such as cavities are easily formed, resulting in reduced bonding strength; when the wedge is solidified in the blade root assembly, the wedge will crack and break due to the concentration of solidification stress. When using yarn to fill the gaps between components, it depends on visual inspection and experience, which cannot guarantee the production quality of the entire blade root part. Utility Model Content

[0004] The purpose of the utility model is to provide a wind turbine blade root screw sleeve prefabricated part pultrusion structure in view of the defects existing in the prior art.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A wind turbine blade root screw sleeve preform pultrusion structure, comprising a mandrel and a shell, wherein the mandrel comprises a screw sleeve assembly and a core material rod alternately connected along a pultrusion direction, and the shell is formed on the outer ring of the mandrel by a pultrusion process and is arranged in a rectangular shape;

[0007] The screw sleeve assembly includes two metal screw sleeves arranged opposite to each other, and a connector connecting the two metal screw sleeves, the connector connects the socket ends of the two metal screw sleeves, a plug is arranged at the tail end of the metal screw sleeve away from the socket end, and the core rod is connected to the plug through a connecting assembly.

[0008] Furthermore, the plug-in connector includes a shaft body and clamping blocks arranged at two ends of its side wall, and a clamping groove is arranged at the socket end of the metal screw sleeve corresponding to the clamping block;

[0009] The clamping blocks are evenly arranged along the circumferential direction of the side wall of the shaft body, and the clamping grooves are arranged along the circumferential direction of the inner wall of the metal screw sleeve corresponding to the clamping blocks.

[0010] Furthermore, the slot includes an inserting section and a limiting section which are interconnected, the inserting section is arranged along the axial direction of the metal screw sleeve and extends to the end face of the socket end thereof, and the limiting section is arranged along the circumferential direction of the metal screw sleeve.

[0011] Furthermore, the clamping block is configured as a wedge-shaped structure, including a first inclined surface disposed thereon, and the first inclined surfaces on the clamping block at both ends of the shaft body are disposed opposite to each other;

[0012] A second inclined surface is arranged at one end of the limiting section away from the plug-in section corresponding to the first inclined surface.

[0013] Furthermore, a hard rubber washer is provided on the outer ring of the shaft, and two sides of the hard rubber washer are respectively abutted against the end faces of the plug-in sections of the two metal screw sleeves, and the outer diameter of the hard rubber washer is smaller than the outer diameter of the metal screw sleeve.

[0014] Furthermore, the connecting assembly includes a long screw and a latch, and a limiting hole is provided at one end of the long screw away from the threaded portion thereof corresponding to the latch;

[0015] An inserting slot and a pin hole which are interconnected are provided at the end of the core rod, the long screw and the plug are respectively arranged in the inserting slot and the pin hole, and the plug passes through the limiting hole.

[0016] Furthermore, the insertion slot is coaxially arranged with the core material rod, and the pin hole is arranged to penetrate the core material rod in a radial direction.

[0017] Furthermore, a threaded slot hole is provided at the center position of the plug corresponding to the long screw.

[0018] Furthermore, the shell includes a yarn layer, a filling layer and a fabric layer, the yarn layer is coated on the outer ring of the core shaft, and the filling layer is located between the yarn layer and the fabric layer;

[0019] The yarn layer is formed on the outer ring of the core shaft by a three-dimensional weaving process and is formed by heating and curing. The fabric layer is formed by pultruding the fabric into a four-sided structure and is sleeved on the outer ring of the yarn layer. The filling layer is formed by filling the gaps at the four circumferential corners between the yarn layer and the fabric layer with yarn.

[0020] Furthermore, the core material rod is set to be in a straight cylindrical shape, and the material of the core material rod is set to be PET or PMI high temperature resistant material.

[0021] The beneficial effects of the utility model are:

[0022] In the present invention, the wind turbine blade root screw sleeve prefabricated part adopts a pultrusion structure, replacing the traditional assembly structure of UD rods, PET rods and screw sleeves. The core shaft assembled in the pultrusion structure is combined with reinforcing fibers to obtain a screw sleeve profile through a pultrusion production line, and then the blade root screw sleeve is obtained after cutting, thereby realizing the continuous production of the blade root screw sleeve; in the subsequent production of the blade root module, the blade root screw sleeve is directly placed in the blade root mold and integrally cast with the blade root shell.

[0023] Compared with the traditional blade root production process, the blade root screw sleeve with pultrusion structure omits the production process of prefabricated blade roots and realizes continuous production of blade root screw sleeves through pultrusion process, which greatly reduces production costs, improves production efficiency and simplifies the molding process of blade root screw sleeves.

[0024] The inner core of the pultruded structure is a mandrel composed of alternately arranged screw sleeve assemblies and core material rods, which can effectively ensure the stability and strength of the pultruded structure; the setting of the rectangular pultruded shell is conducive to enhancing the rigidity and bearing capacity of the overall structure. The two metal screw sleeves arranged opposite to each other in the screw sleeve assembly are connected by a plug-in connector, which is convenient for the installation and removal of the two metal screw sleeves. At the same time, a plug is provided at the tail end of the metal screw sleeve away from the plug-in connector to achieve effective sealing of the metal screw sleeve and enhance the sealing of the screw sleeve assembly; the core material rod is connected to the plug through a connecting assembly, making the mandrel splicing structure simple and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model 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 some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 This is a structural schematic diagram of the prefabricated screw sleeve at the root of a wind turbine blade in the utility model;

[0027] Figure 2 This is a schematic diagram of the structure of the core shaft of the utility model;

[0028] Figure 3 It is a structural schematic diagram of the screw sleeve assembly in the utility model;

[0029] Figure 4 It is a schematic diagram of the plug-in connection between the plug-in connector and the metal screw sleeve in the utility model;

[0030] Figure 5 It is a schematic diagram of the cross-sectional structure of the core shaft of the utility model;

[0031] Figure 6 for Figure 5A magnified view of the local structure at point A in the middle;

[0032] Figure 7 This is a schematic diagram of the molding structure of the screw sleeve prefabricated part in the utility model;

[0033] Figure 8 This is another schematic diagram of the molding structure of the screw sleeve prefabricated part in the utility model.

[0034] Figure numerals: 1, core shaft; 11, screw sleeve assembly; 111, metal screw sleeve; 112, slot; 112a, plug section; 112b, limit section; 112c, second inclined surface; 12, plug; 121, threaded slot; 13, hard rubber gasket; 14, connector; 141, shaft; 142, block; 142a, first inclined surface; 15, core rod; 151, plug slot; 152, pin hole; 16, connecting assembly; 161, long screw; 161a, limit hole; 162, pin; 2, shell; 21, yarn layer; 22, filling layer; 23, fabric layer. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0036] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0038] like Figures 1 to 8A wind turbine blade root screw sleeve preform pultrusion structure is shown, comprising a core shaft 1 and an outer shell 2, the core shaft 1 comprising a screw sleeve assembly 11 and a core rod 15 alternately connected along the pultrusion direction, the outer shell 2 is formed on the outer ring of the core shaft 1 by a pultrusion process and is arranged in a rectangular shape; the screw sleeve assembly 11 comprises two metal screw sleeves 111 arranged opposite to each other, and a connector 14 connecting the two metal screw sleeves 111, the connector 14 connects the socket ends of the two metal screw sleeves 111, a plug 12 is arranged at the tail end of the metal screw sleeve 111 away from the socket end, and the core rod 15 is connected to the plug 12 through a connecting assembly 16.

[0039] In the present invention, the wind turbine blade root screw sleeve preform adopts a pultrusion structure, replacing the traditional assembly structure of UD rods, PET rods and screw sleeves. The core shaft 1 assembled in the pultrusion structure is combined with reinforcing fibers to obtain a screw sleeve profile through a pultrusion production line, and then the blade root screw sleeve is obtained after cutting, thereby realizing the continuous production of the blade root screw sleeve; in the subsequent production of the blade root module, the blade root screw sleeve is directly placed in the blade root mold and integrally cast with the blade root shell.

[0040] Compared with the traditional blade root production process, the blade root screw sleeve with pultrusion structure omits the production process of prefabricated blade roots and realizes continuous production of blade root screw sleeves through pultrusion process, which greatly reduces production costs, improves production efficiency and simplifies the molding process of blade root screw sleeves.

[0041] In the present invention, the inner core of the pultruded structure is a core shaft 1 composed of alternately arranged screw sleeve assemblies 11 and core rods 15, which can effectively ensure the stability and strength of the pultruded structure; the setting of the rectangular pultruded outer shell is conducive to enhancing the rigidity and bearing capacity of the overall structure.

[0042] In the specific connection structure of the core shaft 1, the two metal screw sleeves 111 arranged opposite to each other in the screw sleeve assembly 11 are connected by a plug-in connector 14, which is convenient for the installation and disassembly of the two metal screw sleeves 111. At the same time, a plug 12 is provided at the tail end of the metal screw sleeve 111 away from the plug-in connector 14 to achieve effective sealing of the metal screw sleeve 111 and enhance the sealing of the screw sleeve assembly 11; the core material rod 15 is connected to the plug 12 through the connecting assembly 16, so that the splicing structure of the core shaft 1 is simple and easy to operate.

[0043] During the pultrusion production process, the metal screw sleeve 111 and the core rod 15 are continuously supplied on the pultrusion production line. It is necessary to connect the core rod 15 and the two metal screw sleeves 111 in advance, and cooperate with a roller track of the pultrusion production line to transport the alternately connected metal screw sleeves 111 and the core rod 15 to the pultrusion die mouth, and control the advancement speed of the core shaft 1 to be consistent with the garbage speed.

[0044] After the screw sleeve profile is obtained through the pultrusion process, the screw sleeve profile is first cut by a cutting device arranged at the tail end of the pultrusion production line to obtain a continuous profile unit, wherein the cutting line is arranged corresponding to the core rod 15 and is arranged obliquely relative to its length direction, and the profile unit includes a screw sleeve assembly 11 and half of the core rod 15 respectively arranged at both ends thereof; then the pultruded shell located at the connection between the two metal screw sleeves 111 in the profile unit is subjected to a ring cutting operation, and the connection between the metal screw sleeves 111 on both sides by the connector 14 is released to obtain two blade root screw sleeves with the same structure.

[0045] In this embodiment, if Figure 3 and Figure 4 The structure of the connector 14 shown in the figure comprises a shaft body 141 and blocks 142 arranged at both ends of its side walls, and a slot 112 is arranged at the socket end of the metal screw sleeve 111 corresponding to the block 142; a plurality of blocks 142 are evenly distributed along the circumference of the side wall of the shaft body 141, and a plurality of slots 112 corresponding to the blocks 142 are arranged along the circumference of the inner wall of the metal screw sleeve 111.

[0046] Furthermore, the slot 112 includes a plug-in section 112a and a stop section 112b that are interconnected. The plug-in section 112a is arranged along the axial direction of the metal screw sleeve 111 and extends to the end surface of the socket end thereof, and the stop section 112b is arranged along the circumferential direction of the metal screw sleeve 111. The block 142 is arranged as a wedge-shaped structure, including a first inclined surface 142a arranged thereon, and the first inclined surfaces 142a on the block 142 at both ends of the shaft body 141 are arranged opposite to each other; a second inclined surface 112c is arranged at one end of the stop section 112b away from the plug-in section 112a corresponding to the first inclined surface 142a.

[0047] During the splicing process of the screw sleeve assembly 11, the block 142 at either end of the shaft 141 of the connector 14 is aligned with the groove 112 on the inner wall of the socket end of the metal screw sleeve 111, and the connector 14 is first inserted into the socket end of the metal screw sleeve 111 along the axial direction, and then rotated circumferentially so that the first inclined surface 142a on the block 142 abuts against the second inclined surface 112c in the groove 112, thereby completing the plug-in fit between the connector 14 and the metal screw sleeve 111.

[0048] The other end of the shaft 141 of the connector 14 is plugged and matched with another metal screw sleeve 111, wherein the first inclined surface 142a and the second inclined surface 112c are arranged opposite to each other. During the disassembly and assembly process of the metal screw sleeve 111, the metal screw sleeves 111 on both sides are relatively rotated to adjust the plug-in state with the connector 14. When the plug-in state is released, the metal screw sleeve 111 is axially moved and separated from the connector 14. Compared with the solution of connecting two metal screw sleeves 111 by stud bolts, the disassembly and assembly operation of the connector 14 is simpler.

[0049] Furthermore, a hard rubber washer 13 is sleeved on the outer ring of the shaft body 141 , and two sides of the hard rubber washer 13 are respectively in contact with the end faces of the plug-in sections 112 a of the two metal screw sleeves 111 . The outer diameter of the hard rubber washer 13 is smaller than the outer diameter of the metal screw sleeve 111 .

[0050] The provision of the hard rubber gasket 13 can enhance the sealing effect of the plug end of the metal screw sleeve 111 and prevent resin from entering the screw sleeve; the outer diameter of the hard rubber gasket 13 is slightly smaller than the outer diameter of the metal screw sleeve 111, which does not affect the sealing effect and provides a cutting margin for the ring cutting operation of the profile unit, thereby completing the cutting of the pultruded shell while minimizing damage to the hard rubber gasket 13.

[0051] In this embodiment, if Figure 5 and Figure 6 As shown, the connecting assembly 16 includes a long screw 161 and a latch pin 162, and a limiting hole 161a is provided at one end of the long screw 161 away from its threaded portion corresponding to the latch pin 162; a socket groove 151 and a pin hole 152 that are interconnected are provided at the end of the core rod 15, the long screw 161 and the latch pin 162 are respectively arranged in the socket groove 151 and the pin hole 152, and the latch pin 162 passes through the limiting hole 161a.

[0052] Furthermore, the insertion slot 151 is coaxially arranged with the core rod 15 , the pin hole 152 is radially penetrated through the core rod 15 , and a threaded slot hole 121 is opened at the center position of the plug 12 corresponding to the long screw 161 .

[0053] During the plug-in process of the metal screw sleeve 111 and the core rod 15, after the screw is screwed and fixed to the threaded groove hole 121 on the plug 12, the insertion groove 151 at one end of the core rod 15 is docked with the screw, and the core rod 15 is rotated and adjusted to make the hole 152 of the pin 162 communicate with the limiting hole 161a of the screw. After the pin 162 is inserted, the core rod 15 and the screw are fixedly connected, completing the fixed connection between the core rod 15 and the metal screw sleeve 111.

[0054] In this embodiment, if Figure 7 As shown, the outer shell 2 includes a yarn layer 21, a filling layer 22 and a fabric layer 23. The yarn layer 21 is wrapped around the outer ring of the core shaft 1, and the filling layer 22 is located between the yarn layer 21 and the fabric layer 23. The yarn layer 21 is formed on the outer ring of the core shaft 1 through a three-dimensional weaving process and is formed by heating and curing. The fabric layer 23 is formed by pultruding the fabric into a four-sided structure and is sleeved on the outer ring of the yarn layer 21. The filling layer 22 is formed by filling the gaps at the four circumferential corners between the yarn layer 21 and the fabric layer 23 with yarn.

[0055] Through the wet three-dimensional weaving process, the yarn is woven outside the core shaft 1, and the yarn is solidified by heating once to form a yarn layer 21, which further fixes the metal screw sleeve 111 and the core rod 15; the yarn is arranged on the inner side of the fabric layer 23, and the interface bonding force between the filling layer 22 and the yarn layer 21 can be enhanced by the mold pressure; see further Figure 8 As shown, the upper, left and right parts of the fabric layer 23 are integrated into an integral structure by fabric, and the lower part of the fabric layer 23 is formed by fabric alone, which is convenient for extruding resin. In the pultrusion structure, the fabric layer 23 is as close to the center position of the yarn layer 21 as possible to prevent the yarns at the four corners from being squeezed to other areas after being squeezed.

[0056] In this embodiment, the core rod 15 is set to a straight tube shape, and the material of the core rod 15 is set to PET or PMI high temperature resistant material. In the pultrusion process, the core rod 15 needs to take into account the high temperature resistance. The traditional PVC material is easily oxidized during the pultrusion process and therefore cannot meet the process requirements. Therefore, this application uses PET or PMI high temperature resistant materials.

[0057] Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the description are only for explaining the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A wind turbine blade root screw sleeve preform pultrusion structure, characterized in that: It comprises a mandrel and a shell, wherein the mandrel comprises a screw sleeve assembly and a core rod alternately connected along a pultrusion direction, and the shell is formed on the outer ring of the mandrel by a pultrusion process and is arranged in a rectangular shape; The screw sleeve assembly includes two metal screw sleeves arranged opposite to each other, and a connector connecting the two metal screw sleeves, the connector connects the socket ends of the two metal screw sleeves, a plug is arranged at the tail end of the metal screw sleeve away from the socket end, and the core rod is connected to the plug through a connecting assembly.

2. The wind turbine blade root thread sleeve preform pultrusion structure according to claim 1 is characterized in that: The plug-in connector includes a shaft body and clamping blocks arranged at two ends of its side wall, and a clamping groove is arranged at the socket end of the metal screw sleeve corresponding to the clamping block; The clamping blocks are evenly arranged along the circumferential direction of the side wall of the shaft body, and the clamping grooves are arranged along the circumferential direction of the inner wall of the metal screw sleeve corresponding to the clamping blocks.

3. The wind turbine blade root thread sleeve preform pultrusion structure according to claim 2 is characterized in that: The slot comprises an inserting section and a limiting section which are interconnected. The inserting section is arranged along the axial direction of the metal screw sleeve and extends to the end face of the socket end thereof, and the limiting section is arranged along the circumferential direction of the metal screw sleeve.

4. The wind turbine blade root thread sleeve preform pultrusion structure according to claim 3 is characterized in that: The clamping block is configured as a wedge-shaped structure, including a first inclined surface disposed thereon, and the first inclined surfaces on the clamping block at both ends of the shaft body are disposed opposite to each other; A second inclined surface is arranged at one end of the limiting section away from the plug-in section corresponding to the first inclined surface.

5. The wind turbine blade root thread sleeve preform pultrusion structure according to claim 2, characterized in that: A hard rubber washer is provided on the outer ring sleeve of the shaft, and two sides of the hard rubber washer are respectively in contact with the end faces of the plug-in sections of the two metal screw sleeves, and the outer diameter of the hard rubber washer is smaller than the outer diameter of the metal screw sleeve.

6. The wind turbine blade root thread sleeve preform pultrusion structure according to claim 1, characterized in that: The connecting assembly comprises a long screw and a latch, and a limiting hole is provided at one end of the long screw away from the threaded portion thereof corresponding to the latch; An inserting slot and a pin hole which are interconnected are provided at the end of the core rod, the long screw and the plug are respectively arranged in the inserting slot and the pin hole, and the plug passes through the limiting hole.

7. The wind turbine blade root thread sleeve preform pultrusion structure according to claim 6, characterized in that: The insertion slot is coaxially arranged with the core rod, and the pin hole is arranged to penetrate the core rod in a radial direction.

8. The wind turbine blade root thread sleeve preform pultrusion structure according to claim 7, characterized in that: A threaded slot hole is provided at the center of the plug corresponding to the long screw.

9. The wind turbine blade root thread sleeve preform pultrusion structure according to claim 1, characterized in that: The shell comprises a yarn layer, a filling layer and a fabric layer, the yarn layer is coated on the outer ring of the core shaft, and the filling layer is located between the yarn layer and the fabric layer; The yarn layer is formed on the outer ring of the core shaft by a three-dimensional weaving process and is formed by heating and curing. The fabric layer is formed by pultruding the fabric into a four-sided structure and is sleeved on the outer ring of the yarn layer. The filling layer is formed by filling the gaps at the four circumferential corners between the yarn layer and the fabric layer with yarn.

10. The wind turbine blade root thread sleeve preform pultrusion structure according to claim 1, characterized in that: The core material rod is set to be in a straight cylindrical shape, and the material of the core material rod is set to be PET or PMI high temperature resistant material.

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