39results about How to "Good action reliability" patented technology

The invention discloses an elevator speed governor, and belongs to the technical field of elevator safety protection devices. The elevator speed governor comprises a box body which is provided with a signal collector, a speed governor wheel which is provided with a lock catch, a centrifugal mechanism which is arranged on the speed governor wheel, a centrifugal hammer reset mechanism which is arranged on the speed governor wheel and connected with the centrifugal mechanism, and a traction rope with the upper end fixed to an upper end and lower end connecting counter weight of a top layer floor. The elevator speed governor is characterized by further comprising a traction rope pressing wheel, a safety tongs braking rope and a braking rope traction mechanism, the traction rope pressing wheel is located in a cavity of the box body and arranged in the middle of a traction rope pressing wheel shaft, the middle of the traction rope is wound on the speed governor wheel and the traction rope pressing wheel, the upper end of the safety tongs braking rope is tied and fixed to the braking rope traction mechanism, the lower end of the safety tongs braking rope is connected with a pair of safety tongs, the speed governor wheel shaft is sleeved with the braking rope traction mechanism, and the braking rope traction mechanism is matched with the signal collector and the lock catch. The situation that negative rotation happens to the speed governor wheel is avoided; the effect of reliably locking a guide rail through the safety tongs is improved; action is reliable, and safety is ensured; the structure is simple, manufacturing is convenient, and assembling is rapid.

The invention relates to a short-circuit protection device for a switching device, belonging to the technical field of power distribution. The short-circuit protection device comprises a protection device body which is internally provided with a signal sampling input module. The short-circuit protection device is characterized in that an output end of the signal sampling input module is connectedinto an input end of a release driving module through a micro-processing module; an input end of the signal sampling input module is connected with an output end of a current signal amplifying device; the output end of the current signal amplifying device is respectively connected into input ends of a data conversion device and a comparison unit; output ends of the data conversion device and the comparison unit are connected into an input end of a microprocessor; and an output end of the microprocessor is connected with the input end of the release driving module. Therefore, the short-circuitprotection device has the advantages of compact overall design, concise signal transmission mode among the devices, good action reliability, strong anti-interference ability, high reliability, and being capable of accurately judging and handling signals at the first time.

A control and protection circuit of a control and protection switching device pertains to the technical field of electric industry. The invention includes a signal sampling circuit, a short-circuit detection circuit, a microprocessor circuit, a magnetic flux converter control circuit and a power converting circuit; the signal sampling circuit sends a current signal to the microprocessor circuit after the amplification and the potential uplifting, the short-circuit detection circuit sends a large range signal in the signal sampling circuit to the microprocessor circuit after the processing, themicroprocessor circuit judges whether the short-circuit fault is existed or not, a corresponding control signal is given out and sent to the magnetic flux converter control circuit, the magnetic fluxconverter control circuit converts the low-level signal which is emitted by the microprocessor circuit to a high-level signal by photoelectric isolation, a magnetic flux converter is driven, the power conversion circuit converts the alternating current high voltage to the direct current low voltage, so as to provide the power for the circuits. The circuit transfer method is simple, the structureis simple, the reliability of the actions is good, the anti-interference capacity is strong, and the invention has the advantages of small size and high reliability when the invention is used for thecontrol and protection switching device.