Pultrusion blade root threaded sleeve mandrel structure of wind power blade

Abstract

The utility model relates to the technical field of wind power blade production, in particular to a wind power blade pultrusion blade root threaded sleeve mandrel structure which comprises threaded sleeve assemblies and core material bars which are continuously and alternately arranged in the pultrusion direction, the threaded sleeve assemblies are connected with the core material bars through joggle joint connecting pieces, and two metal threaded sleeves in the threaded sleeve assemblies are connected through studs. The blade root thread sleeve is obtained by cutting the core shaft matched with the reinforced fibers through a pultrusion production line, continuous production of the blade root thread sleeve is achieved through the pultrusion process, the blade root prefabricating procedure is omitted, the production cost is greatly reduced, the production efficiency is improved, and meanwhile the blade root thread sleeve forming procedure is simplified. Metal thread sleeves and core material bars are continuously supplied on a pultrusion production line, the core material bars and the two metal thread sleeves need to be connected in advance, in the connecting process of mandrels, the multiple metal thread sleeves and the multiple core material bars are prepared, meanwhile, joggle joint connecting pieces and double-end bolts are correspondingly arranged to achieve splicing connection of the mandrels, and the connecting structure is simple and convenient to operate.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power blade production, in particular to a pultruded root bushing mandrel structure for wind power blades. Background Art

[0002] Wind power generation converts wind energy into electrical energy through wind turbines. As one of the core components of wind turbines, the embedded sandwich structure at the root part of the blade provides overall rigidity for the wind power blade. The root bolt sleeve assembly, as one of the important components connecting the blade and the hub, is traditionally manufactured by a vacuum infusion process. The bolt sleeve is connected to the core rod, and is arranged circumferentially along the mold in cooperation with two wedge-shaped strips on both sides, and is cured by a vacuum infusion process in cooperation with relevant fiber yarns and multi-axial fabrics.

[0003] When preparing the root bolt sleeve assembly by the traditional vacuum infusion process, each component is assembled after preparation, and it is very difficult to ensure the consistency of the gaps and spacings between them, and it is extremely easy to form defects such as cavities, resulting in a reduction in the bonding force; the wedge-shaped parts will crack and break due to the curing stress concentration during the curing of the root component. When using yarn to fill the gaps between components, it depends on the visual inspection and experience of workers, and the production quality of the root part cannot be guaranteed. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a pultruded root bushing mandrel structure for wind power blades aiming at the defects existing in the prior art.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is: a pultruded root bushing mandrel structure for wind power blades, which includes bushing assemblies and core rods arranged continuously and alternately along the pultrusion direction, and the bushing assemblies are connected to the core rods through tenon connectors;

[0006] The bushing assembly includes two metal bushings arranged oppositely, and a double-headed bolt connecting the two metal bushings, and the socket ends of the two metal bushings are arranged oppositely;

[0007] Internal threads are provided at one end of the metal bushing away from its socket end, the double-headed bolt is screwed to the internal threads, and the tenon connector is connected to the end of the metal bushing where the internal threads are provided.

[0008] Further, the bushing assembly further includes a hard rubber washer arranged between the two metal bushings, the hard rubber washer is sleeved on the outer circle of the double-headed bolt, and its two sides are respectively abutted against the socket ends of the two metal bushings.

[0009] Further, snap rings are symmetrically arranged on both sides of the hard rubber washer, and the snap rings are coaxially arranged with the hard rubber washer;

[0010] The outer diameter dimension of the hard rubber washer is correspondingly set with the outer diameter dimension of the metal bushing, and the outer wall of the snap ring fits with the inner wall of the metal bushing.

[0011] Further, the tenon joint connector includes a tenon head and a screw rod part, and tenon groove parts are correspondingly arranged at both ends of the length of the core rod with respect to the tenon head;

[0012] A plug is arranged at one end of the metal bushing where the internal thread is provided. The tenon joint connector is clamped through the tenon head and the tenon groove part, and is screwed with the plug through the screw rod part.

[0013] Further, the tenon head is set as a T-shaped equal cross-section block structure, including a limiting plate and a connecting block arranged thereon;

[0014] The screw rod part is arranged at the middle position of the connecting block, and the width dimension of the connecting block is smaller than the width dimension of the limiting plate.

[0015] Further, the tenon groove part is arranged to penetrate along the radial direction of the core rod, and includes a clamping groove and a limiting groove arranged in sequence along the axial direction of the core rod;

[0016] The clamping groove and the limiting groove respectively match with the connecting block and the limiting plate, and the clamping groove is arranged on the end face of the core rod.

[0017] Further, both ends of the length of the connecting block and the limiting plate are arranged as arc surfaces in cooperation with the outer wall of the circumferential direction of the core rod.

[0018] Further, a threaded groove hole is correspondingly arranged on the plug with respect to the screw rod part, and the threaded groove hole is coaxially arranged with the metal bushing.

[0019] Further, an installation groove is arranged at one end of the metal bushing where the internal thread is provided. The plug is in interference fit with the installation groove and is adhesively fixed through structural adhesive.

[0020] Further, the core rod is set as a straight cylinder shape, and the material of the core rod is set as a PET or PMI high-temperature resistant material.

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

[0022] In the present invention, the root bushing of the wind turbine blade replaces the UD rod, PET rod and bushing structure in the traditional root structure. Instead, a mandrel formed by splicing is used and combined with reinforcing fibers to obtain a bushing profile through a pultrusion production line, and then the root bushing is obtained after cutting, realizing the continuous production of the root bushing; the root bushing is directly placed in the root mold and integrally pultruded with the root shell, omitting the process of prefabricating the root; the continuous production of the root bushing is realized through the pultrusion process, greatly reducing the production cost, improving the production efficiency and simplifying the forming process of the root bushing at the same time.

[0023] Specifically, on the pultrusion production line, the metal bushing and the core rod are continuously supplied. It is necessary to connect the core rod and two metal bushings in advance. The core rod is fixedly connected to the adjacent metal bushing and core rod through a tenon joint connector, and the two metal bushings in the bushing assembly are fixedly connected through a double-headed bolt; that is, during the connection of the mandrel, multiple metal bushings and core rods are prepared, and two parts, namely the tenon joint connector and the double-headed bolt, are correspondingly configured to realize the splicing of the mandrel. The connection structure is simple and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is a schematic structural diagram of the pultruded root bushing mandrel of the wind turbine blade in the present invention;

[0026] Figure 2 It is an exploded schematic diagram of the continuous mandrel structure in the present invention;

[0027] Figure 3 It is a schematic structural diagram of the hard rubber washer in the present invention;

[0028] Figure 4 It is a connection schematic diagram of the tenon joint connector and the core rod in the present invention;

[0029] Figure 5 It is a cross-sectional schematic diagram of the continuous mandrel structure in the present invention;

[0030] Figure 6 It is Figure 5 The enlarged partial structural diagram at position A in

[0031] Figure 7 It is Figure 5 The enlarged partial structural diagram at position B in

[0032] Reference numerals: 1, sleeve assembly; 11, metal sleeve; 111, internal thread; 112, mounting groove; 12, double-headed bolt; 13, hard rubber washer; 131, snap ring; 14, plug; 141, threaded slot hole; 2, core rod; 21, tenon groove part; 211, clamping groove; 212, limiting groove; 3, tenon joint connector; 31, tenon head part; 311, limiting plate; 312, connecting block; 32, screw rod part. Detailed implementation manners

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0034] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation manner.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used in the specification of the present invention herein 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 of the related listed items.

[0036] As Figures 1 to 7 shown, a pultruded blade root sleeve core shaft structure for a wind turbine blade includes sleeve assemblies 1 and core rods 2 that are continuously and alternately arranged along the pultrusion direction. The sleeve assemblies 1 are connected to the core rods 2 through tenon joint connectors 3. Among them, the sleeve assembly 1 includes two relatively arranged metal sleeves 11 and a double-headed bolt 12 connecting the two metal sleeves 11. The socket ends of the two metal sleeves 11 are relatively arranged. An internal thread 111 is provided at one end of the metal sleeve 11 away from its socket end. The double-headed bolt 12 is screwed with the internal thread 111, and the tenon joint connector 3 is connected to the end of the metal sleeve 11 where the internal thread 111 is provided.

[0037] In the present invention, the root bushing of the wind turbine blade replaces the UD rod, PET rod and bushing structure in the traditional root structure. Instead, a mandrel formed by splicing is combined with reinforcing fibers to obtain a bushing profile through a pultrusion production line, and then the root bushing is obtained after cutting, realizing the continuous production of the root bushing. The root bushing is directly placed in the root mold and integrally potted with the root shell, omitting the process of prefabricating the root. The continuous production of the root bushing is realized through the pultrusion process, greatly reducing the production cost, improving the production efficiency and simplifying the molding process of the root bushing at the same time.

[0038] Specifically, the metal bushing 11 and the core rod 2 are continuously supplied on the pultrusion production line. It is necessary to connect the core rod 2 and the two metal bushings 11 in advance, and the alternately connected metal bushings 11 and core rods 2 are conveyed to the pultrusion die opening through a roller track of the pultrusion production line. During the pultrusion process, the advancing speed of the mandrel is maintained consistent with the pultrusion speed.

[0039] Furthermore, the core rod 2 fixedly connects the adjacent metal bushing 11 and core rod 2 through a tenon joint connector 3, and the two metal bushings 11 in the bushing assembly 1 are fixedly connected through a double-headed bolt 12. That is, during the connection of the mandrel, a plurality of metal bushings 11 and core rods 2 are prepared, and two kinds of parts, namely the tenon joint connector 3 and the double-headed bolt 12, are correspondingly configured to realize the splicing of the mandrel. The connection structure is simple and easy to operate.

[0040] The obtained root bushing includes a metal bushing 11 and a half core rod 2 cut obliquely. After obtaining the pultruded bushing profile, first, the bushing profile is cut by a cutting device arranged at the end of the pultrusion production line. The cutting line is arranged corresponding to the core rod 2 and obliquely arranged relative to its length direction. After being cut by the cutting device, the obtained profile unit includes a bushing assembly 1 and half core rods 2 respectively arranged at both ends thereof. Finally, the pultruded shell at the connection position of the two metal bushings 11 of the profile unit is subjected to a circumferential cutting operation, and in cooperation with the loosening of the double-headed bolt 12, the bushing profile is broken off from the connection position of the two metal bushings 11, and the fixed connection of the double-headed bolt 12 to the metal bushing 11 is released, obtaining two root bushings with the same structure.

[0041] In this embodiment, as Figure 2 and Figure 3 shown, the bushing assembly 1 further includes a hard rubber washer 13 arranged between the two metal bushings 11. The hard rubber washer 13 is sleeved on the outer circle of the double-headed bolt 12, and its two sides are respectively abutted against the socket ends of the two metal bushings 11.

[0042] Furthermore, snap rings 131 are symmetrically arranged on both sides of the hard rubber washer 13, and the snap rings 131 are coaxially arranged with the hard rubber washer 13; the outer diameter of the hard rubber washer 13 is correspondingly set with the outer diameter of the metal bushing 11, and the outer wall of the snap ring 131 is in contact with the inner wall of the metal bushing 11.

[0043] By arranging the hard rubber washer 13 between the two metal bushings 11 in the bushing assembly 1, the sealing of the socket end of the metal bushing 11 is achieved to prevent resin from entering; at the same time, the setting of the hard rubber washer 13 leaves a cutting space between the two metal bushings 11, and at the same time ensures that the circumferential cutting operation can completely cut off the pultruded shell, facilitating the subsequent separation of the two blade root bushings in the bushing profile.

[0044] In this embodiment, as Figure 4 shown in the connection structure between the core rod 2 and the metal bushing 11, the tenon joint connector 3 includes a tenon head 31 and a screw rod part 32. Tenon grooves 21 are correspondingly opened at both ends of the core rod 2 for the tenon head 31; a plug 14 is arranged at the end of the metal bushing 11 where the internal thread 111 is opened. The tenon joint connector 3 is snap-connected through the tenon head 31 and the tenon groove 21, and is screwed with the plug 14 through the screw rod part 32.

[0045] Furthermore, the tenon head 31 is set as a T-shaped cross-section block structure, including a limiting plate 311 and a connecting block 312 arranged thereon; the screw rod part 32 is arranged at the middle position of the connecting block 312, and the width dimension of the connecting block 312 is smaller than the width dimension of the limiting plate 311. A threaded groove hole 141 corresponding to the screw rod part 32 is opened on the plug 14, and the threaded groove hole 141 is coaxially arranged with the metal bushing 11.

[0046] The core rod 2 realizes tenon and mortise connection with the tenon head 31 of the tenon joint connector 3 through the tenon groove 21 thereon, and then realizes fixed connection with the plug 14 at the tail end of the metal bushing 11 through the screw rod part 32 of the tenon joint connector 3, that is, realizes fixed connection between the core rod 2 and the metal bushing 11 through the tenon joint connector 3; the T-shaped structure of the tenon head 31 realizes snap connection with the tenon groove 21 through its limiting plate 311. When the tenon joint connector 3 is tenon and mortise connected with the core rod 2, the screw rod part 32 arranged thereon is coaxially arranged with the core rod 2, ensuring that after the core rod 2 is connected to the metal bushing 11 through the tenon joint connector 3, their axes are coaxially arranged.

[0047] Furthermore, the tenon groove 21 penetrates along the radial direction of the core rod 2, including a clamping groove 211 and a limiting groove 212 arranged in sequence along the axial direction of the core rod 2; the clamping groove 211 and the limiting groove 212 respectively adapt to the connecting block 312 and the limiting plate 311, and the clamping groove 211 is opened on the end face of the core rod 2. The length ends of the connecting block 312 and the limiting plate 311 are both provided with arc surfaces in cooperation with the outer wall of the core rod 2 in the circumferential direction.

[0048] The tenon joint connector 3 is inserted into the notch of the tenon groove part 21 on any radial side of the end of the core rod 2, so that the tenon head 31 is fully engaged with the tenon groove part 21, and its two end faces form a smooth arc surface with the outer surface of the circumferential side of the core rod 2, ensuring the flatness of the outer surface of the core rod 2 after being spliced into the mandrel and ensuring the smooth operation of the pultrusion operation.

[0049] As Figure 5 shown, the core rod 2 is set in a straight cylinder shape, and the material of the core rod 2 is set as a PET or PMI high-temperature resistant material. Further referring to Figure 7 shown, an installation groove 112 is provided at one end of the metal bushing 11 where the internal thread 111 is provided, and the plug 14 is in interference fit with the installation groove 112 and is adhesively fixed through structural adhesive.

[0050] In the pultrusion process, the high-temperature resistance characteristics of the core rod 2 need to be considered. The traditional PVC material is prone to oxidation during the pultrusion process and thus cannot meet the process requirements. Therefore, this application adopts a PET or PMI high-temperature resistant material. The plug 14 is adhesively fixed to the tail end of the metal bushing 11 through structural adhesive, while achieving the sealing of the tail end of the metal bushing 11 and ensuring a stable connection with the tenon joint connector 3. Among them, the sealing of the two length ends of the metal bushing 11 is achieved through the hard rubber washer 13 and the plug 14, avoiding the resin from entering the metal bushing 11 during the pultrusion process.

[0051] Those skilled in the art of this industry should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A wind turbine blade pultrusion root screw sleeve mandrel structure, characterized in that: It comprises a screw sleeve assembly and a core material rod which are continuously and alternately arranged along the pultrusion direction, wherein the screw sleeve assembly is connected to the core material rod through a mortise and tenon connector; The screw sleeve assembly comprises two metal screw sleeves arranged opposite to each other, and a stud bolt connecting the two metal screw sleeves, and the socket ends of the two metal screw sleeves are arranged opposite to each other; An internal thread is provided at one end of the metal screw sleeve away from its socket end, the stud bolt is threadedly connected to the internal thread, and the mortise and tenon connector is connected to the end of the metal screw sleeve where the internal thread is provided.

2. The wind turbine blade pultruded blade root screw sleeve mandrel structure according to claim 1 is characterized in that: The screw sleeve assembly also includes a hard rubber washer arranged between the two metal screw sleeves. The hard rubber washer is sleeved on the outer ring of the stud bolt, and the two sides of the hard rubber washer are respectively abutted against the socket ends of the two metal screw sleeves.

3. The wind turbine blade pultruded blade root screw sleeve mandrel structure according to claim 2 is characterized in that: Snap rings are symmetrically arranged on both sides of the hard rubber gasket, and the snap rings are coaxially arranged with the hard rubber gasket; The outer ring size of the hard rubber gasket is set corresponding to the outer diameter size of the metal screw sleeve, and the outer wall of the clamping ring is fitted with the inner wall of the metal screw sleeve.

4. The wind turbine blade pultruded blade root screw sleeve mandrel structure according to claim 1, characterized in that: The mortise and tenon connector includes a mortise portion and a screw portion, and mortise grooves are provided at both ends of the length of the core rod corresponding to the mortise portion; A plug is provided at one end of the metal screw sleeve with the internal thread, and the mortise and tenon connector is clamped with the mortise and tenon groove portion through the mortise portion and is screwed with the plug through the screw portion.

5. The wind turbine blade pultruded blade root screw sleeve mandrel structure according to claim 4, characterized in that: The tenon head is configured as a T-shaped block structure with equal cross-section, including a limit plate and a connecting block arranged thereon; The screw rod portion is arranged at the middle position of the connecting block, and the width dimension of the connecting block is smaller than the width dimension of the limiting plate.

6. The wind turbine blade pultruded blade root screw sleeve mandrel structure according to claim 5, characterized in that: The tongue and groove portion is arranged to penetrate along the radial direction of the core material rod, and includes a clamping groove and a limiting groove arranged in sequence along the axial direction of the core material rod; The clamping groove and the limiting groove are respectively adapted to the connecting block and the limiting plate, and the clamping groove is arranged on the end surface of the core material rod.

7. The wind turbine blade pultruded blade root screw sleeve mandrel structure according to claim 5, characterized in that: Both ends of the length of the connection block and the limiting plate are configured as arc surfaces in cooperation with the circumferential outer wall of the core rod.

8. The wind turbine blade pultruded blade root screw sleeve mandrel structure according to claim 5, characterized in that: A threaded slot hole is provided on the plug corresponding to the screw portion, and the threaded slot hole is coaxially arranged with the metal screw sleeve.

9. The wind turbine blade pultruded blade root screw sleeve mandrel structure according to claim 4, characterized in that: A mounting groove is provided at one end of the metal screw sleeve where the internal thread is formed, and the plug is interference-fitted with the mounting groove and is fixed by structural adhesive.

10. The wind turbine blade pultruded blade root screw sleeve mandrel 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.

Images