Keyboard tray

A keyboard tray, comprising:

• a fixing frame, wherein the fixing frame comprises a fixing frame body, and the fixing frame body is fixed to a bottom of a desktop;
• a movable frame, wherein the movable frame comprises a movable frame body and a sliding mechanism, a sliding rail in the sliding mechanism is mounted on the fixing frame body, and a sliding block in the sliding mechanism is connected to the movable frame body;
• two angle adjusting mechanisms, wherein each of the angle adjusting mechanisms comprises a limiting plate, a supporting rod, and a positioning pin, the limiting plate is connected to the movable frame body, the supporting rod is hinged to the limiting plate, a plurality of first limiting holes are provided in the limiting plate, distances between each of the first limiting holes and a hinge shaft of the supporting rod are equal, a second limiting hole is correspondingly provided in the supporting rod, and the positioning pin is allowed to pass through the first limiting hole and the second limiting hole to achieve locking;
• a pull rope, wherein both ends of the pull rope are respectively hooked to ends of two positioning pins, and the two positioning pins are allowed to be simultaneously driven to withdraw from the first limiting hole or the second limiting hole when a middle portion of the pull rope is pulled by a user;
• and
• a supporting plate, wherein the supporting plate is mounted on the supporting rod and is used to support a keyboard.