Abstract: A data transmission system used between counter rotating bodies and the design method of the system consisting of a data acquisition unit, one-to-N1 branching unit, N1 launching units, N2 all-in-one combiner, N2 receiving units and data processing equipment. N1 launching units and one-to-N1 branching unit are set on one counter rotating body; N2 all-in-one combiner and N2 receiving units are set on the other counter rotating body; one of the launching units and one of the receiving units are arranged on the closed movement path of the rotating body, and the maximum interval between two adjacent units of the other one is the closed movement path divided by its number and then deducted by the working range of the former one. One pair or several pairs of N1 launching units and N2 receiving units, of which the working range coincides with each other, have data transmission.

Abstract: A quick connection device for electric appliance includes a base (1) and a plug (2), the base (1) has several grooves (11), each groove (11) has a contact (3) connected with electrical wires, the base (1) has a center hole (12), the plug (2) has several conductive rings (4) mated with the grooves (11), the outside of the plug (2) has wiring interface (5) electrically connected with the conductive rings (4), the plug (2) has a connecting rod (6) which is able to be inserted into the center hole (12), the connecting rod (6) has a lock structure (7) fixed to the center hole (12). The electric appliance, such as a fan and a droplight, is fixed to the plug (2), then the plug (2) is fixed to the base (1) by the connecting rod (6), the plug (2) is separated from the base (1) by unlocking the lock structure (7), the device is operated quickly and easily, and it can carry a heavy load.