4results about How to "Short closing time" patented technology

An automatic sealing flood prevention rolling shutter door comprises a rolling shutter door body capable of being unfolded according to the flood condition of the ground surface space so as to achieve opening and closing of an entrance and exit and flood prevention. The door frame system is in water tightness fit with the roller shutter door and is fixedly arranged relative to the entrance and exit; and under the non-flood condition, the roller shutter door can be stored so as to realize opening of the entrance and exit. The device can be automatically started when flood danger occurs in the earth surface space, the roller shutter door is automatically started to achieve closing of the entrance and exit, and meanwhile the flood prevention effect is achieved. The system can be remotely controlled, automatically controlled or locally controlled, has multiple operation and control modes, improves the running reliability of the roller shutter door, is suitable for flood prevention of newly-built underground projects such as subway stations and property management connection channels, underground garages and underground shopping malls or transformation of existing projects, can save civil engineering space, is convenient to operate, and improves the construction efficiency. And the device has the advantages of attractive structure, convenience in installation, no influence on normal passage, quickness in operation, short closing time and the like.

The application relates to an abnormal function module cutting method, system, device and controller. The method comprises the following steps: acquiring the operation parameters of each function module in a converter valve; the operation parameters are used for representing the operation state of the function module; judging whether the function module is normally operated according to the operation parameters of the function module; in the case that the function module is abnormally operated, controlling a trigger switch to be turned on, and in the case that the trigger switch is turned on, controlling a bypass switch to be turned on; wherein the first end of the bypass switch is used for connecting the first end of the function module, the second end of the bypass switch is used for connecting the second end of the function module; the first end of the trigger switch is used for connecting the first end of the function module, and the second end of the trigger switch is used for connecting the second end of the function module. By adopting the method, the main circuit in the function module can be quickly and accurately cut off in the case that the function module in the converter valve is abnormal, so that the normal operation of other function modules in the converter valve is ensured.

The invention relates to the technical field of coal bunker equipment, in particular to a coal bunker collapse prevention device which comprises a collapse prevention gate, the collapse prevention gate comprises a fan-shaped gate, a rotating shaft and a driving component, the fan-shaped gate comprises an arc-shaped gate plate and a fan-shaped side plate, and a shaft hole connected with the rotating shaft in a matched mode is formed in the circle center corresponding to the arc edge of the fan-shaped side plate; after the rotating shaft penetrates through the shaft hole, the two ends of the rotating shaft are supported by the two side walls of the feeding equipment guide groove, a rotating shaft supporting point is arranged on the upper portion close to the outlet end of the feeding equipment guide groove, and the radial gate plate is close to the receiving end of the feeding equipment guide groove relative to the rotating shaft. The left side edge and the right side edge of the arc-shaped gate plate are coupled with the two side walls of a material guide groove of the feeding equipment, the lower end of the arc-shaped gate plate is coupled with the bottom face of a material conveying cavity of the feeding equipment, the direction of torque formed by force exerted on the arc-shaped gate plate by moving materials is the same as that of torque needed for closing the gate, the fan-shaped gate can be rapidly closed, and further bin collapse can be prevented.

The invention is suitable for the technical field of power electronics, and provides a photovoltaic system and a grid-connected method of the photovoltaic system, and the photovoltaic system comprises a photovoltaic string unit, an inverter, a grid-connected switch and a frame circuit breaker. The photovoltaic string unit is connected with the input end of the inverter; the output end of the inverter is connected with the input end of the grid-connected switch; the output end of the grid-connected switch is connected with the input end of the frame circuit breaker; the output end of the frame circuit breaker is used for being connected with a three-phase power grid. The grid-connected switch comprises a plurality of power switch tubes; the frame circuit breaker is used for closing under the condition that the inverter responds to a grid-connected instruction; and the plurality of power switch tubes are used for conducting under the condition that the electric signal output by the inverter is consistent with the electric signal of the three-phase power grid, so as to complete the closing of the grid-connected switch. According to the photovoltaic system and the grid connection method of the photovoltaic system provided by the invention, rapid grid connection is realized.