2results about How to "Prevent reverse" patented technology

The application provides a contactor, relates to the technical field of switches, and is used for reducing the possibility that the circuit board in the prior art cannot meet use requirements. The contactor comprises a base, a circuit board assembly and a plurality of conductive pieces, wherein the base has a containing cavity. The circuit board assembly is arranged in the containing cavity, and the circuit board assembly comprises a first circuit board and a second circuit board. One end of at least two conductive pieces is electrically connected with the first circuit board, and the other end of the at least two conductive pieces is electrically connected with the second circuit board. One end of the remaining at least two conductive pieces is electrically connected with the circuit board assembly, and the other end of the remaining at least two conductive pieces is electrically connected with the end part of a coil possessed by the contactor.

The application provides a grid type pipeline ventilation method suitable for downward drift filling stope, which comprises the following steps: carrying out grid type pipeline ventilation scheme design of the downward drift filling stope, constructing a one-layer one-step drift stope X, Y and Z three-way pipeline ventilation system, constructing a one-layer two-step drift stope X, Y and Z three-way pipeline ventilation system, and constructing a one-layer below drift stope Y and Z way pipeline ventilation system to form an overall grid type pipeline ventilation system. The application can effectively solve the problem that the downward drift stope has no independent return air channel and is difficult to form through air flow, guarantee the safety of stope operation, save engineering quantity and reduce cost; the local ventilator does not need to be moved multiple times, and the air flow can be prevented from reversing at the same time; the grid type pipeline ventilation system can return air in multiple ways, and the air resistance is small, the air speed is high, and the efficiency is high.