TWM339584U - An embedded stud with taper surface and key for root joint of wind turbine blade - Google Patents

Abstract

The invention relates to a stud which can be embedded into the root part of a fiber reinforced plastic (FRP) wind turbine blade for bolt connection to the pitch bearing on blade hub and transmitting the rotary forces from blade to hub. Some layers of the dry fiber cloth is placed on the blade mould at the root part firstly then the studs are placed on the perimeter in accordance with the design. The taper part of the stud is designed with key. Fiber can be placed into the key way to enhance the mechanical lock. Then, rest of dry fiber cloth is lay up as designed. By vacuum assisted resin transfer molding (VARTM) method, after closing with plastic bag, resin is pull into the dry fiber cloth in vacuum condition and hardened following the curing process. Owing to the thread on the outside surface of stud and the key way in the taper part, in the vacuum process the dry fiber is compressed into the thread/key way space. After the VARTM, not only the thread but also the key way provides the maximum lock force between the fiber reinforced plastic blade root and the metal stud which will both contribute to the fulfillment of the functions of the blade root connection.

Description

M339584 VIII. New Description: [New Technology Field] This creation is a kind of stud that can be used for fiber reinforcement. The studs of the roots of wind turbine blades are made to make f# and wind and miscellaneous load-bearing bolts. Locks the rotational power of the blade. Since the _bolt of the device has a thread around it, there is a beveled surface in the middle and rear parts, and there is a pressure difference between the vacuuming of the borrower, and the Brayweb will touch the thread to fully smash the __ cloth. After fully containing the grease hardening, the maximum biting force of the bolts can be added to achieve the goal of applying the device to the root of the wind turbine blade. [Prior Art] The wind turbine blades made of fiber-reinforced plastics and the wind turbine shaft are screw-checked, and the roots of the blades are required to be made into a hybrid structure, which can be reliably carried out. Use buried studs (Stud), and then bribe _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ The length is sufficient to transmit light force and the _ cloth can be laid flat. The surface of the stud is roughened. At the back of the stud, the (four) material needs to be provided with a conversion section so that the fiber cloth can be laid flat. Since the (four) material-assisting material is complicated, and there is no keyway to provide the fixing force, the total length of the stud bolt needs to be longer. [New content] For this reason, the purpose of this creation is to propose a pre-embedded stud bolt for the blade root of a wind turbine with a beveled surface and a keyway to facilitate the above work. The creation has a chamfered surface in the rear part of the stud bolt, and the fiber cloth can be laid flat, and the thread is provided outside the stud bolt, and the key surface is provided with a key groove. The key groove can be first placed into the fiber cloth by the pressure of vacuuming. Poor, the fiber cloth will fully engage with the surface of the stud bolt 6 M339584. After the fiber cloth is fully impregnated with the resin, all the surfaces and the keyway can provide the maximum biting force of the embedded stud bolt to achieve the goal of applying the device to the root of the wind turbine blade. [Embodiment] The preferred embodiment of the present invention will be described in detail below with reference to the drawings. Signing the first picture is a plan view of the creation of a pre-embedded stud of a wind turbine blade with a beveled surface and a keyway. The utility model comprises: a stud bolt 10, an outer diameter D, and an outer thread 2〇, which is used for enhancing the interfacial adhesion force between the blade root portion of the fiber reinforced plastic and the stud bolt, and the inner bolt hole 30 of the diameter d is arranged on the center line of the stud bolt to The Ligan joint bolt is used for locking; one end of the stud is thinned into a chamfered surface 4〇, and a keyway 5〇 is provided on the chamfering surface for increasing the fixing force, and the length of the unsloped surface of the column screw is larger than the length of the inner bolt hole . Referring to the second figure, the side view of the creation of a wind turbine blade root pre-embedded stud with a beveled surface and a keyway is shown. The stud is cut by 4 〇, and the final thickness is about 删, and the keyway 5 设有 is provided on the slanting surface of the xiao J. The trailing edge is roughly from the center line of the stud, the depth is downward, and the length of the forward P is h is approximately (1/3 - i/5)d. After the fiber cloth is laid on the root mold 7〇, the thread is placed on the outside of the stud bolt, and the key groove is inserted into the fiber cloth on the beveled surface. By the pressure difference of vacuuming, the fiber cloth will be fully smashed with the stud bolt. At this time, the resin is infused by the vacuum pressure difference to fully impregnate the fiber cloth. After the resin is hardened, the surface and the key groove can provide the maximum biting force of the embedded stud bolt, and the target of applying the device to the root of the wind turbine blade is achieved. The above-mentioned "the wind turbine blade root pre-embedded column bolt with the beveled surface and the keyway" created by the above-mentioned case provides an effective solution to the blade root of the wind-enhanced flap-shaped wind turbine. The problem of fully establishing the bite force of the P-pillar and the interface is already industrially useful, and the new M339584 is notable and progressive, in line with the new patent requirements. However, the above description is only a preferred embodiment of the present invention, and is not limited to a solid surface. That is, the equal changes and materials made by the patent scope are covered by the scope of the creation patent. [Simple description of the diagram] The first picture is _ "- the blade root of the wind turbine with the beveled surface and the keyway Plan view of the pre-embedded studs. The second figure is a side view of the creation of the "pre-embedded studs for wind turbine blades with chamfered surfaces and keyways". , ” [Key symbol description] ίο stud bolt 20 external thread 30 internal bolt holes & 40 chamfered 50 key slot

70 root mold

Claims (1)

M339584 Nine, the scope of application for patent: hy type of wind turbine blade root pre-embedded column screw inspection with chamfering surface and keyway, including: pre-buried in the root of the tea slice, column and external external thread, column bolt center line An internal bolt hole is provided for locking the root coupling bolt; the characteristic is that the stud end is a beveled surface, so that the fiber cloth can be laid smoothly, and a keyway is provided on the chamfer surface for enhancing the embedded stud bolt. With the pressure difference of vacuum pumping, the fiber cloth will be fully engaged with the (4) bolt. At this time, the resin is infused by the vacuum pressure difference to fully impregnate the fiber cloth. After the resin is hardened, all surface key grooves and blade structures are achieved. Fully combined goals. 2. A wind turbine blade root embedded stud with a beveled surface and a keyway as described in claim 1 has a ratio of the inner bolt hole diameter to the minimum keyway depth on the chamfered surface of between 3 and 5. 3. The wind turbine blade root pre-embedded stud having a beveled surface and a keyway according to claim 1, wherein the length of the un-cut surface of the stud is greater than the length of the inner bolt hole.