BLADE ROOT CLOSE OUT MECHANISM
Publication Date: 2017-Jul-21
The IP.com Prior Art Database
The invention relates to a close out mechanism, and more particularly to two embodiments of the blade root close out mechanism without using riveted or bolted method. The hub has a supporting part around a hatch and near a blade root. The close out mechanism comprises a hatch assembly and four attaching parts installed under the supporting part. The hatch assembly comprises a hatch cover, four arms, four guide rails and a locking pin. The size of the hatch cover is larger than the hatch. The arms can linearly move along the guide rail. The locking pin is used to prevent the arms from moving when the arms have completely engaged into the attaching parts. The attaching part comprises a high compression spring, a wedge and a L-shaped attachment. The L-shaped attachment is installed under the supporting part, and the spring is installed on a horizontal part of the L-shaped attachment, and the wedge is installed on the spring. The space S between the wedge and the supporting part can receive or engage the arm and the space S is less than the thickness of the arm. When the hatch needs to be closed, the arms move towards the attaching parts. When the arm moves and touches a hypotenuse of the wedge, the spring get compressed and the wedge slides down gradually. With the compression of the spring, the space S becomes larger and can receive the arm. When the arm completely moves into the space S, the compressed spring can provide an upward force to the arm for preventing the arm from slipping out the space S. After closing the hatch, the arms can be locked by using the locking pin. When the hatch needs to be opened, the locking pin is opened and the arms move out the space S, then the hatch assembly can be opened.
BLADE ROOT CLOSE OUT MECHANISM
The invention relates generally to a close out mechanism, and more particularly to a blade root close out mechanism without using riveted or bolted method.
A wind turbine comprises a nacelle, a hub, blades and a wind turbine tower. The nacelle is on the top of the wind turbine tower. The hub is rotatablely attached to the nacelle, and the blades are attached to the hub. The hub has at least one hatch near the blade root so that an operator can enter or exit the at least one hatch. In order to close the at least one hatch, a lid is usually riveted or bolted directly onto the hatch. However, due to the type of joint, there are a plurality of issues with the joints, such as cracking of rivets due to fatigue, shearing off or tearing of base structure if made up of composites.
BRIEF DESCRIPTION OF DRAWINGS
Fig. 1 is a schematic diagram of a close out mechanism in accordance with one embodiment of the present invention;
Fig. 2 is a top view of the close out mechanism of Fig. 1 in an open position, wherein a hatch cover and a handle are removed;
Fig. 3 is a schematic diagram of the close out mechanism of Fig. 2 in a close position;
Fig. 4 is a schematic diagram of a close out mechanism in accordance with another embodiment of the present invention in an open position; and
Fig. 5 is a schematic diagram of the close out mechanism of Fig. 4 in a close position.
The invention proposes two embodiments of a close out mechanism for closing the hatch. Figs. 1-3 illustrate a close out mechanism 1 in accordance with one embodiment of the present invention.
In general, the hub has a supporting part 11 around a hatch 10 and near a blade root. As shown in Figs.1-3, the close out mechanism 1 comprises a hatch assembly 12, and four attaching parts 13 installed under the supporting part 11. The hatch assembly 12 comprises a hollow shaft 121, a bottom disc 122, a handle 123, a hatch cover 124, an arm assembly 125, and a locking pin 126. Specifically, as shown in Fig. 1, the hatch cover 124 is connected to the hollow shaft 21 and the size of the hatch cover 124 is
larger than the size of the hatch 10. The size of the bottom disc 122 is less than the size of the hatch 10. One end of the hollow shaft 121 is fixed to the handle 123, and the other end of the hollow shaft 121 is connected to the bottom disc 122 via a bearing which is installed in the bottom disc 122. The arm assembly 125 is mounted on the bottom disc 122 and is fixed to the hollow shaft 121. When the handle 123 is rotated, the arm assembly 125 can rotate but the hatch cover 124 and the bottom disc 122 cannot rotate. The locking pin 126 is installed on the hatch cover 124 and can be used to lock the handle 123 when the hatch assembly 12 completely close the hatch 10. The arm assembly 125 comprises two bars 51, four swing arms 53, and four pivots 52. The bars 51 comprise a bar 511 and a bar 512, and the bar 511 and the ba...