as is known to all, in order to dissipate the high temperature during operation, a fan is usually installed at the rear of the chassis.this heat dissipation fan is fixed and has a considerable influence on the shape.besides, the fan is located in the horizontal direction, which makes the heat dissipation efficiency subject to restrictions, and if the fan is arranged above the casing, although the rising heat temperature can be rapidly distributed, the appearance of the casing is damaged.therefore, the existing computer casing still maintains the traditional mode and cannot be greatly improved.moreover, the traditional casing itself does not have portable structure, so that when handling can only be picked up with two hands, it is not convenient, therefore need to be improved.

according to the purpose of this article, aiming at the defects of the above-mentioned general computer mainframe structure, the invention provides a liftable heat dissipation fan and a lifting handle structure of a computer casing, which enable the fan to be hidden above the casing without affecting the appearance of the casing, and can be used by simply pressing to open a certain angle to achieve heat dissipation:purpose; The structure comprises a fixed frame seat, a fan, a cover plate and a lifting handle, wherein the fixed frame seat is provided with a buckle and a switch at the front edge and a groove at the rear edge, and the cover plate is provided with a guide groove at the bottom edge for the fan to slide, and is arranged at both sides of the rear edge of the cover plate are respectively provided with curved shaft rods, so that the cover plate is sleeved in the groove of the fixed frame seat by the shaft rods and a spring is arranged in the center, and the front edge of the cover plate is provided with a buckle rod corresponding to the buckle, so that when the cover plate is closed, the buckle rod can be just buckled to the buckle, and the fan is hidden the rear is equipped with another seat body, which is equipped with fan speed adjustment switch and US B socket to facilitate the plug-in of peripheral equipment and the adjustment of cooling fan speed.