38results about How to "Avoid secondary failure" patented technology

The invention discloses an elevator safe operation data coupling device and a working method, comprising: a plurality of passive Rfid tags arranged on the moving door leaf of the elevator and the leveling positions of each floor, and an Rfid reader arranged on the elevator car; When the moving door leaf of the elevator is fully opened, the reader can activate the Rfid tag set on the moving door leaf; when the elevator reaches the leveling position, the Rfid reader can activate the Rfid tag set on the leveling position of each floor; the Rfid reader passes through The wireless communication method transmits the received data information to the data monitoring center. Beneficial effects of the present invention: the collection of elevator operation information is directly realized through the data coupling system composed of electronic tags and scanning devices, no physical sensors are required, a large amount of physical wiring, equipment purchase, commissioning and maintenance costs are saved, resources are saved, and it is avoided This produces a secondary fault.

The invention discloses a three-phase fault-tolerant inverter circuit and a control method thereof. The three-phase fault-tolerant inverter circuit comprises a direct current power supply and an inverter bridge, the upper bridge arm of a first inverter bridge arm is connected with a high-speed fuse F1 while the lower bridge arm is connected with a high-speed fuse F4, the upper bridge arm of a second inverter bridge arm is connected with a high-speed fuse F3 while the lower bridge arm is connected with a high-speed fuse F6, and the upper bridge arm of a third inverter bridge arm is connected with a high-speed fuse F5 while the lower bridge arm is connected with a high-speed fuse F2; an auxiliary inverter circuit is connected between the direct current power supply and the inverter bridge and is composed of an auxiliary upper bridge arm insulated gate bipolar transistor Q7, an auxiliary lower bridge arm insulated gate bipolar transistor A8, an auxiliary first inverter bridge arm insulated gate bipolar transistor S1, an auxiliary second inverter bridge arm insulated gate bipolar transistor S2, an auxiliary third inverter bridge arm insulated gate bipolar transistor S3 and single-phase bridge rectifiers Z1, Z2 and Z3. The three-phase fault-tolerant inverter circuit and the control method thereof realize to isolate the fault of the bridge arm with short circuit or open circuit fault and have good fault-tolerant running function.

The invention relates to a flushing and detecting system of a triple valve, a solvent valve and a spray gun of an automata, which comprises a compressed air supply device, a solvent supply device, a diaphragm pump and a plurality of pipelines, wherein the diaphragm pump is connected with the solvent supply device to pump out solvents in the solvent supply device with certain pressure; the pipelines are correspondingly connected to make the solvents and compressed air enter the solvent valve, the triple valve and the spray gun so as to clean the solvent valve, the triple valve and the spray gun, and after cleaning, the solvents flow back to the solvent supply device through a backflow pipe so as to be recycled. The flushing and detecting system of the solvent valve, the triple valve and the spray gun of the automata simulates the working principle of the automata to mix the solvents and the compressed air with certain pressure and further clean the valves and the spray gun with a good cleaning effect, and simultaneously whether a valve core is damaged or shifted or not is judged through observing the movement situation and the leakage condition of the valve core in air control.

The invention discloses a single-phase cascaded H-bridge rectifier switching tube open-circuit fault diagnosis method, which calculates the switching function under normal operation and different switching tube faults according to the system switch control signal and the AC side current polarity; according to the circuit of the cascaded H-bridge rectifier Topology, the output current calculation model and state estimation model of the single-phase cascaded H-bridge rectifier module are obtained, and the calculation value and estimated value of the output current are obtained. Based on the characteristics that the fault characteristics of different module current residuals are separated and different fault diagnosis variables are independent of each other, any fault switch can be located by comparing the diagnosis variables with the adaptive detection threshold. The invention can realize the real-time diagnosis of the single-phase cascaded H-bridge rectifier in the fault state of single or multiple switching tubes in the online real-time system, and is not free from network voltage fluctuations, load changes and operating conditions of the single-phase cascaded H-bridge rectifier The impact of changes; and the diagnosis time is short, which can isolate faults in time and avoid secondary faults of the system.

The invention relates to the field of an electric power system, and discloses a method for restoring self-growth. The method is based on a power distribution terminal which monitors a power distribution line and is used for analyzing the information of the power distribution line in real time. After a fault occurs, fault information is successively transmitted to a tie switch power distribution terminal from a fault point power distribution terminal. The tie switch power distribution terminal starts restoring of a non-fault area. Directly monitored areas are successively analyzed. According to a line operation topology, self-growth analysis is performed until the area where power supply can be restored. The terminal which directly manages the switch bypasses the switch and insulates the area which requires power supply restoring. Furthermore a terminal which directly manages the tie switch switches on the tie switch, thereby finishing power supply restoring to the non-fault area.

The invention relates to the field of hydraulic power mechanical components, and discloses a hydraulic cylinder equipped with a device for automatically detecting and processing liquid leakage. The front end of the cylinder casing is fixedly connected with a right hydraulic oil valve, the upper end of the right hydraulic oil valve is provided with a hydraulic oil main port, a limit block is arranged inside the hydraulic cylinder casing, and the right end of the hydraulic cylinder casing is movable A power rod is connected, a cylinder cover is fixedly connected to the opening of the hydraulic cylinder shell, a left hydraulic oil valve is arranged on the left end of the cylinder cover, and a detection device is fixedly connected to the left side of the hydraulic cylinder shell. The upper end of the detection device is movably connected with a switch, and the lower end of the switch is fixedly connected with a main helical gear. The device can provide a good sealing environment for the detection device and improve the detection performance of the detection state through the cooperation of the closed door and the latex block. .

The invention discloses a thread locking structure, which is used for locking a screw for connecting an upper connecting piece and a lower connecting piece together, and comprises a through hole formed in the upper connecting piece and a threaded hole formed in the lower connecting piece, a locking gasket is arranged between the through hole and a screw cap of the screw, a clamping groove is formed in the screw cap, and the threaded hole is arranged in the clamping groove. The locking gasket is provided with a bending part which can be clamped into the clamping groove; the locking gasket is provided with a positioning protrusion, the through hole is provided with a positioning groove for the positioning protrusion to be clamped in, or the locking gasket is provided with a positioning groove, and the through hole is provided with a positioning protrusion clamped in the positioning groove. The positioning protrusion is clamped into the positioning groove to achieve angular position fixation between the locking gasket and the upper connecting piece, and after the threads are tightened, the bent portion is clamped into the clamping groove, so that angular position fixation among the screw, the locking gasket and the upper connecting piece is achieved.

The invention discloses a servo intelligent power control circuit and a servo intelligent power control method based on thyristor rectification. The control circuit comprises an MCU (microprogrammed control unit), a signal processing circuit, a sampling circuit, an ADC (analog-digital converter) conversion circuit, an alarm processing circuit and a thyristor triggering circuit, wherein the sampling circuit is used for acquiring alternating-current and direct-current bus voltage and current signals and providing the acquired signals for the signal processing circuit and the ADC conversion circuit; the signal processing circuit is used for reshaping and comparing the acquired signals and providing a natural phase change point of a corresponding-phase alternating-current bus for the MCU; and the MCU is used for processing the signals from the signal processing circuit and the ADC conversion circuit and controlling a thyristor array by the aid of the thyristor triggering circuit. The control circuit solves the technical problems that output voltage is non-adjustable as alternating-current and direct-current rectification portions adopt three-phase diode rectifiers, continuous powering up cannot be achieved as a thermistor is used for soft start, or secondary failure occurs easily as a high-power cement resistor is adopted.

The embodiment of the invention discloses a management method, device, server and storage medium of a transaction channel. The method includes: if there is a normal transaction channel whose request success rate of the transaction request does not meet the preset requirements, setting the normal transaction channel as an abnormal transaction channel, and reallocating the pending transaction requests corresponding to the abnormal transaction channel Trading channel: Wait for a preset time, and determine whether the maintenance of the abnormal trading channel is completed according to at least two levels of success rate discrimination methods; if the maintenance of the abnormal trading channel is completed, set the abnormal trading channel as a normal trading channel. The technical solution provided by the embodiment of the present invention solves the problem of untimely switching of available trading channels in the prior art or prone to secondary failures after switching, so as to realize accurate switching of trading channel states during the process of executing transaction requests, Improve system stability and availability.