41results about How to "Avoid accident expansion" patented technology

The invention discloses an electric railway section post automatic passing over of neutral section system and a control method thereof, and relates to the field of electric railway traction power supply. Pantograph recognizers are arranged on sectionalizers close to power supply arms. Load switches, thyristor switches and current transformers are sequentially connected in series and then connected to the two ends of the sectionalizers in parallel together with resistors and standby switches. The output ends of the pantograph recognizers, the current transformers and a voltage transformer, the trigger ends of the thyristor switches and the operation ends of the load switches and the standby switches are connected with a control unit. After the first thyristor switch is turned off due to current zero, the second thyristor switch is turned on to achieve current zero crossing point instantaneous switching from the first power supply arm to the second power supply arm, so that the power supply of a train is instantaneously switched from the first power supply arm to the second power supply arm, and uninterruptible power supply is achieved. The high-voltage high-resistance first resistor and second resistor work independently or together, and both can restrain balance current and the potential transient process. The system is mainly used for train continuous electricity passing over of neutral section.

The invention discloses a subsection split phase automatic-passing system of an electric railway and a split phase automatic-passing method of the subsection split phase automatic-passing system of the electric railway. According to the subsection split phase automatic-passing system of the electric railway, a first catenary and a second catenary are connected with a neutral section through a first electric subsection and a second electric subsection respectively, a first current transformer is connected to the portion, close to the first electric subsection, of the first catenary in series, a second current transformer and a first normally-open switch are connected in series, and then are connected to the first electric subsection in parallel, and a third current transformer and a second normally-closed switch are connected in series, and then are connected to the second electric subsection in parallel; a first voltage transformer and a second voltage transformer are connected with the tail end of the first catenary and the tail end of the second catenary respectively; a first pantograph detector is installed on a supporting column of the first current transformer, a second pantograph detector is installed on the first electric subsection, and a third pantograph detector is installed on the second electric subsection; the first current transformer, the second current transformer, the third current transformer, the first pantograph detector, the second pantograph detector, the third pantograph detector, the first voltage transformer, the second voltage transformer and the first normally-open switch are connected with a control unit. The subsection split phase automatic-passing system of the electric railway is simple in structure, small in investment and convenient to implement, subsection split phase automatic-passing operation of the electric railway can be achieved completely and more reliably, and the lockout function is achieved when the subsection split phase automatic-passing system is abnormal.

The invention relates to a traffic safety dangerous point information collecting and prompting method. The traffic safety dangerous point information collecting and prompting method is characterized by comprising the following steps that 1) a client uploads geographical position coordinate information with traffic safety risk to a server; 2) the server collects and processes the information uploaded by the client and then feeds back the geographical position coordinate information with traffic safety risk to the client; and 3) after obtaining the feedback information, the client carries out traffic safety dangerous point prompting. The method has the advantage that the traffic safety dangerous point prompting is carried out after the traffic safety risk is found.

The invention discloses a fireproof and leakproof system for a high-temperature centrifugal pump, and belongs to the field of chemical equipment. The fireproof and leakproof system comprises a pump body, a non-driving-end bearing housing, a driving-end bearing housing and a shaft, the non-driving-end bearing housing and the driving-end bearing housing are of sealed structures and are fixed onto the pump body, a bearing is positioned in a sealed cavity of each bearing housing, the shaft penetrates through the bearings and the pump body and is fittingly fixed, a gas inlet and a condensate drain opening are disposed on each bearing housing, each gas inlet is connected with a gas pipeline, a gas inlet valve is disposed on each gas pipeline, the gas pipelines are connected with a gas delivery pipe, and a condensate drain valve is arranged on each condensate drain opening. The gas delivery pipe is connected with a gas supply device. Each bearing housing is provided with a pressure monitoring device. Opening and closing of each condensate drain valve are adjusted by a remote control device. The bearing housings at two ends of the pump are of the sealed structures after change, the fireproof and leakproof system is provided with vapor seals or gas seals, when seal leakage occurs, water vapor or nitrogen is filled into the pump via a control system, oil gas leakage is stopped, and fire accidents are prevented. Furthermore, combustion can be reduced by the aid of blowing and diluting effects of the water vapor or the nitrogen, fire is quickly extinguished, and accordingly loss is reduced.

The invention relates to a warning system for wheel disengagement of a sintering circle-cooling machine. The warning system for wheel disengagement of the sintering circle-cooling machine comprises an optoelectronic switch, a pull switch and an infrared camera, wherein the optoelectronic switch, the pull switch and the infrared camera are located beside the circle-cooling machine. The optoelectronic switch is connected with the pull switch and a programmable logic controller (PLC) module. The PLC module is used for writing a corresponding program according to signals sent by the optoelectronic switch and the pull switch and sending the signals to a computer and a broadcast in a center-control operating room for computer picture warning and broadcast voice warning. The infrared camera is connected with a television monitoring system, and the signals are transmitted to a television through the television monitoring system to be displayed in the form of television images. By the adoption of the warning system, people can be warned of the fault of wheel disengagement of the circle-cooling machine in time, center control operators are reminded to check through the television monitoring system, and accidents are prevented from being further worsened.

The invention relates to an automatic dismounting type power battery box system. The automatic dismounting type power battery box system comprises a base and a battery box. The automatic dismounting type power battery box system adopts a vehicle-mounted power source to realize installation and separation of the battery box, and rapid guidance and graded positioning of the vehicle-mounted battery box; the uniformity of light and convenient guidance and accurate positioning is realized; the base and a vehicle body adopt a suspension mechanism connected with an elastic part; in an absorption process of the battery box, a lock tongue of a locking device is popped out under the action of a locking spring and the battery box is automatically locked; when the battery box has safety failures or isdismounted, an unlocking triggering device of an unlocking device is triggered, and the battery box and the base and a connector socket and a plug are rapidly separated through a separation spring; the battery box is smoothly released from the vehicle body and the safety hidden safety dangers hazards are eliminated; accidents are prevented from being further expanded.

The invention relates to an online automatic detection device for strip steel loop decoupling and a detection method thereof. The device comprises a rotary encoder used for detecting loop quantity and installed at the driving shaft end of a loop winching motor, a plurality of position induction switches respectively and correspondingly arranged at the normal stopping positions of loop trolleys and a programmable logic controller (PLC). The input end of the PLC is connected with the position induction switches and a winching encoder, and the output end of the PLC is connected with an alarming device. When a loop cart moves to the position of one loop trolley, the rotary encoder inputs measured loop quantity into the PLC. If the loop trolley is located at the normal stopping position, the position induction switch of the loop trolley is activated, the corresponding PLC input signal is 1, otherwise, the signal is 0. The position induction signal of each loop trolley is sequentially input into the PLC to be compared with value of a control indicator. If the signal is not inconsistent with the value, the loop trolley is in the decoupling mode, and the alarming device alarms. The detection method is simple, reliable and effective, has high cost performance and is capable of automatically and timely judging loop decoupling.

The invention provides a micro-leakage detector, a system with the same and a detection method of the detector. A micro-leakage detector and a valve leakage detecting fault preprocessing device are arranged on storage equipment; the input end of the valve leakage detecting preprocessing device is connected with the output end of a first button and is respectively connected with an air inlet air pressure sensor and an air outlet air pressure sensor; the output end of the valve leakage detecting preprocessing device is respectively connected with an inlet cutoff valve and an outlet cutoff valve; the input end of the micro-leakage detector is connected with the output end of a second button and is connected with an air pressure sensor for the storage equipment; the output end of the micro-leakage detector is respectively connected with the inlet cutoff valve and the outlet cutoff valve. According to the micro-leakage detector, the system with the same and the detection method of the detector, equipment leakage can be effectively found as soon as possible to avoid accident expanding, and non-permanent non-damaging temporary leaking hidden safety loopholes can be automatically processed in advance, so the manual workload can be reduced.

The invention discloses a fault self-adaptive ground connecting processing system and method for a distribution network power grid. The distribution network power grid comprises a bus. The grounding processing system comprises a grounding transformer, a small resistor putting system, arc extinction complete equipment and a main control system, wherein the arc extinction complete equipment is connected with the bus through the grounding transformer, the small resistor putting system comprises a small resistor and a high-voltage contactor, one end of the small resistor is grounded, the other end of the small resistor is connected with the high-voltage contactor, the high-voltage contactor is connected with the grounding transformer, and the main control system is used for controlling the arc extinction complete equipment and the high-voltage contactor. The embodiment of the invention further discloses a fault self-adaptive ground connecting processing method for the distribution network power grid. By means of the fault self-adaptive ground connecting processing system and method for the distribution network power grid, instant grounding and permanent grounding faults can be intelligently distinguished, frequent trips caused by instant grounding faults are prevented, a circuit with permanent grounding faults can be isolated rapidly and accurately, and stable power supply of the power grid is guaranteed.

The invention relates to thermosetting plastic and its preparation method and a power lithium battery pack assembly casing prepared from the thermosetting plastic. The thermosetting plastic comprises a base, fillers, a reinforcing material and aids. The base is prepared from thermosetting resins such as unsaturated polyester resin and vinyl ester resin. The fillers are inorganic non-metallic fillers such as wollastonite and barite. The preparation method comprises (1), dispersion, (2) stirring mixing, kneading and dipping, and (3) curing molding. The assembly casing comprises two or more single boxes connected with each other. The single box forms an integral structure through injection molding. The boxes are provided with connection holes or connection tabs connected to a vehicle frame. The main characteristics of the thermosetting plastic comprise that 1, a thermal deformation temperature is more than 250 DEG C higher than that of the reaction temperature of the lithium compound, 2, the thermosetting plastic is flame retardant, resists a high temperature and does not collapse after burning, 3, the spark discharge caused by battery short circuit is effective resisted, 4, insulation and thermal conductivity are obtained and a battery design is convenient, and 5, weight is light, electrombile weight reduction is promoted and noise is reduced.

The invention belongs to the field of power technology, and relates to a method for shortening a telecontrol channel fault locating time. The method comprises the following steps: reading host.ini and template.ini, specifying a station, selecting the station, selecting a front host, diagnosing a Fes host communication state, circulating the next target machine, logging in a Fes host to diagnose the communication state of a target machine, judging whether the communication state is normal, reporting an error, locating problem, and providing a solution. By adoption of the method, the technical problems of long telecontrol channel fault locating time and troublesome operation steps are solved. The method has the following main beneficial effects: shortening the telecontrol channel fault locating time, reducing important accident signal loss caused by telecontrol channel faults, effectively controlling and avoiding accident expansion, and saving many economic losses; keeping the reliable monitoring of important signals by a e control center to ensure the power supply quality; processing power grid accidents at the first time to improve the quality of service of power supply and relieve the work pressure of automatic operation and maintenance personnel and operation and maintenance personnel of maintenance companies.

The invention relates to a circulating improved water turbine cavitation erosion initial state discrimination system and method, and belongs to the field of a water turbine cavitation erosion initial state. The system comprises an in-situ measurement layer, a signal preprocessing layer and a data processing and analysis layer. Cavitation characteristic values are extracted by applying a data fusion technology and an acoustic emission detection technology, and important auxiliary variables such as unit top cover vibration, water pressure pulsation, a water head, a downstream water level, a large-shaft air supply amount and other working condition data are fused to establish a circulating improved cavitation erosion initial state discrimination model, and realize cavitation state identification and cavitation erosion working condition prediction of a water turbine. A situation that runner blades are damaged and forced to rotate for maintenance due to the long-term cavitation erosion working condition of a water turbine set is reduced, the healthy operation level of the water turbine set is improved, and the service life is prolonged.

The invention provides an on-line digital detection and feedback automatic correction device and method for the out of roundness of a PE pipe. The on-line digital detection and feedback automatic correction device comprises a servo correction part arranged at the front end of a cooling section of the PE pipe and a laser detection part arranged at the rear end of the cooling section of the PE pipe;the laser detection part comprises a first servo motor; an output shaft of the first servo motor is connected with a first driving gear; the first driving gear is engaged with a toothed outer ring ofa first slewing bearing; a laser sensor is arranged on the toothed outer ring of the first slewing bearing; an output shaft of a second servo motor is connected with a second driving gear; the seconddriving gear is engaged with a toothed outer ring of a second slewing bearing; a correcting mechanism assembly comprises a third servo motor and sliding blocks positioned on two sides of the third servo motor; the third servo motor and the sliding blocks are mounted on the toothed outer ring of the second slewing bearing; a roller frame is fixedly mounted on a sliding rail, and is connected witha screw rod through a nut; the screw rod is connected with an output shaft of the third servo motor; and a tapered roller is mounted on the roller frame. The on-line digital detection and feedback automatic correction device and method can detect the out of roundness of a finished PE plastic pipe in a real-time manner, can perform on-line correction and adjustment on the out of roundness of the PEpipe, and enables the error of the out of roundness of the PE pipe to be corrected to the allowable range.

The invention relates to a comprehensive protection system and method for a wind power plant collector line and a box transformer substation, and the method comprises the steps: setting a grid-connected protection device to be installed at a grid-connected point of the collector line, and collecting the three-phase current and three-phase voltage of the grid-connected point; setting a transformerside protection device to collect the high-voltage side three-phase current and the low-voltage side three-phase current of the transformer, and judging whether the corresponding transformer has a fault or not; sending the three-phase current of the high-voltage side of the transformer to a communication host; and enabling the grid-connected protection device to calculate the difference between the sum of the three-phase currents of the high-voltage side of each transformer and the three-phase current of the grid-connected point and judge whether a fault exists or not. According to the invention, the problem of difficulty in setting the protection constant values of the current collection circuit and the box-type transformer is solved, the problem of override trip is effectively avoided, and the selectivity, the quickness and the sensitivity of relay protection are considered. Fault points can be safely and quickly removed, accident expansion is avoided, it is guaranteed that power generation facilities of normal lines can continue to generate power, and benefits of power generation enterprises are increased.

The invention aims at providing a dynamic threshold based 3D quantitative set health evaluation method. According to the technical scheme, the method comprises the steps that a comprehensive 3D evaluation system based on set components, component associated physical attributes and corresponding measuring points is constructed according to the actual situation of a set; different weights of the different components are set according to the importance of the components to the unit, and different weights of the different physical attributes are set according to the importance of the physical attributes to associated components; fixed thresholds of component associated physical attribute parameters are determined; and a mean value [mu]ijk and a variance value [sigma] of normal distribution ofa large amount of xijk data is calculated according to physical attribute data xijk acquired by a kth measurement point according to the jth physical attribute of the ith component within a unit operation time t, and a dynamic threshold range of the kth measurement point according to the [mu] ijk and the [sigma] is determined. The method is suitable for quantitative evaluation of the running stateof the set.

The invention discloses a method for detecting deviation of a steel strip between cold continuous rolling racks. A grating detector is installed between a first rack and a second rack of a rolling mill of a pickling and rolling combined unit to detect edges of the steel strip, an emitter of a grating emits light source signals, and a receiver of the grating receives the light source signals; and in a normal production situation, the grating can sense the signals, the fact that the grating cannot sense the signals shows that a deviation situation of the steel plate between the racks of the rolling mill deviates, then the grating detector emits a decelerating signal to the rolling mill, and the rolling mill starts to decelerate as a whole. The invention aims to provide the method for detecting deviation of the steel strip between the cold continuous rolling racks, whether or not deviation of the steel strip between the racks occurs is judged, and a quick stop instruction is triggered, so that the accident time is shortened.

The invention relates to the technical field of detection devices, and discloses a material blockage detection device. The material blockage detection device comprises an induction probe rod, whereinone end of the induction probe rod extends into material flow; a rotating shaft is rotationally connected with the induction probe rod; a proximity switch in selective contact with the other end of the induction probe; a controller is electrically connected with the proximity switch and comprises a timing module and an alarm module; and falling material can toggle one end of the induction probe rod so that the other end of the induction probe rod is out of contact with the proximity switch. According to the material blockage detection device, the impact force generated by the material in the falling process is converted into an electric signal, once the blockage or the material falling is blocked, and the blockage or the blocking time is longer than a preset value, the alarm module gives an alarm, so that the abnormal process flow condition of the material blockage detection device or the upstream of the material blockage detection device is found in time, and the accident enlargementis avoided, so that the process flow smoothness is improved; and the induction probe rod is not prone to damaging, so that the service life of the material blockage detection device is long.

An overturn-preventing valve comprises a valve body housing, a switch bracket, a pedestal, a straight handle, a return spring and a hex head plug screw, wherein an upper spigot is arranged in the valve body housing; the switch bracket, steel balls and the pedestal are arranged below the upper spigot in sequence; the pedestal comprises a table board and a table body; the table board is arranged at the junction part between the upper cavity and the lower cavity of the valve body; a groove, an oil through hole, an inclined plane and a flow guide groove are formed in the table board; the table board is connected with the straight handle through the table body; the other end of the straight handle is connected with the hex head plug screw after passing through a lower end cap; the return spring is sleeved with the exteriors of the pedestal and the straight handle in parts between the table board and the lower end cap; when a vehicle overturns, an oil inlet pipe and an oil outlet pipe are switched off synchronously through the overturn-preventing valve and a one-way valve; the vehicle returns manually through the pedestal, the straight handle and the return spring. According to the invention, the oil inlet pipeline and the oil outlet pipeline of a fuel oil system can be switched off synchronously to ensure manual return of an overturn oil shut off device, the mounting is convenient, and the safety is higher.

The invention provides an urban rail transit rectifier protection method. The method comprises the following steps: S1, measuring current values of all rectifier diodes of a rectifier; s2, respectively calculating the current maximum value and the current effective value of the current value of each rectifier diode in the time fixed value, and respectively comparing and judging the current maximum value and the current effective value with the current fixed value; and S3, if the judgment result meets the fault judgment condition, controlling the alternating-current side circuit breaker and the direct-current side circuit breaker to trip. The device is characterized in that the device comprises the current transformers and the protector, the protector is connected with the multiple current transformers, the current transformers are used for measuring the current values of the rectifier diodes of the rectifier, and the output of the protector is connected with the alternating current side circuit breaker and the direct current side circuit breaker. According to the invention, the blank of ground fault protection of a secondary side AC ungrounded system of the rectifier transformer is filled.

A comprehensive segmental automobile anti-crash protection scheme belongs to the technical field of automobile electric appliances and comprises an input system, an anti-crash automatic control system, a work anti-crash control executing system, an automobile throttle firing line control circuit and an automobile battery power supply circuit. The anti-crash automatic control system is formed by an automobile speed instrument circuit, a comprehensive segmental alert sensing circuit, a speed sensing control circuit system unit, an anti-crash executing or door circuit, a near-distance prompt or door circuit and an anti-crash automatic control output circuit; the work anti-crash control executing system is formed by a control center unit, a hand-operated zero-clearing restoring unit, an automatic zero-clearing restoring circuit, a zero-clearing restoring output circuit unit, an oil path automatic close unit, a brake automatic starting unit and an acousto-optic prompt circuit unit; all parts form an automobile anti-crash protective whole body; the throttle can be quickly closed and the brake can be emergently executed when an automobile is to crash an object in front, so accidents can be avoided; and automobile driving cannot be hindered when the system is closed.

The invention belongs to the technical field of pressure relief protection of nuclear reactor steam generators, in particular to a rupture disk protection device with an alarming function. The rupturedisk protection device comprises a connection pipe, the connection pipe is arranged in a cavity formed by hermetically connecting a top cover and an outer shell, and a connection pipe inlet in the bottom of the connection pipe is connected to a base at the bottom of the outer shell and serves as a discharging passage of the steam generator during sodium-water reaction; the top of the connection pipe is sealed by a replaceable rupture disk, and any one or more of a high-speed response thermocouple, a sodium leakage detector, a high-temperature conductor terminal and an ultra-high-temperature pressure transmitter which are connected with an external alarming system are arranged at the top of the top cover; a pressure relief outlet is formed in the outer shell, the rupture disk explodes whenthe pressure of internal gas reaches a set value, and the alarming system generates alarming signals according to any one or more signals sent out by the high-speed response thermocouple, the sodiumleakage detector, the high-temperature conductor terminal and the ultra-high-temperature pressure transmitter; the cavity is filled with argon. The rupture disk protection device can conduct pressurerelief at top speed, and is low in maintenance cost and easy to repair and replace.

The invention discloses a control circuit of a turbocompressor oil system. The control circuit is characterized in that firstly the control circuit collects compressor starting and stopping signals and lower-pressure oil pump signals of a main oil pump; when the oil system is in normal circulation, the control circuit can control an auxiliary oil pump to automatically stop when the main oil pump is in operation and a low oil pressure alarm is not given out; the control circuit can start the auxiliary oil pump immediately when the main oil pump of the compressor runs normally and the low oil pressure alarm is given out; and when the main oil pump stops, the control circuit controls the auxiliary oil pump to be automatically started immediately. As the structure is adopted, the control circuit disclosed by the invention has the advantages that the auxiliary oil pump can be automatically started immediately under the condition of faults; a manual starting / stopping function can be added, so that the whole system can be relatively safe and reliable; the starting and stopping operations of the turbocompressor oil system can be normalized; and the safety of equipment and persons can be guaranteed, and the mis-parking or the accident expansion can be avoided.

The invention discloses a combined vacuum contactor. The combined vacuum contactor comprises a base plate handcart arranged in a switch cabinet, a vacuum contactor and a fuse on the upper end face of the vacuum contactor, wherein the vacuum contactor is movably connected with a static contact arranged in the switch cabinet; and the base plate handcart is provided with a slide track, and a test prompt position and a connection prompt position which are used for indicating that the base plate handcart is in different electrical connection states. The switch cabinet for power supply and distribution complete equipment is formed by combining the vacuum contactor, the fuse and the base plate handcart, and compared with the traditional fixed installation mode adopted for a fixed vacuum contactor and a fuse in a case type switch cabinet, the invention has the advantages that the switch cabinet with the base plate handcart is provided with obvious functional division and separation, an accident can be prevented from being expanded in time, and the vacuum contactor is extremely convenient to overhaul and maintain. A protection grade is promoted, error operation preventability is improved, routine overhaul (especially in a fault state) is extremely conveniently performed, and spare parts can be quickly replaced.

The invention discloses a flame-detection based emergency cutoff linear motion valve device and an application method and belongs to the technical field of oil and gas storage and transportation. Theflame-detection based emergency cutoff linear motion valve device comprises a linear motion valve, a piston rod, a hydraulic oil cylinder, a piston, an on-off indication rod, a flame detection module,an oil tank and an energy accumulator. The piston divides the hydraulic oil cylinder into an upper part and a lower part, and the hydraulic oil cylinder comprises a first hydraulic cylinder and a second hydraulic cylinder. The on-off indication rod is connected to the upper portion of the piston and can move up and down along with the piston. The flame detection module is mounted on the top of the on-off indication rod. The first hydraulic cylinder is connected with the energy accumulator through a hydraulic oil pipe B. The upper half portion of the interior of the energy accumulator is provided with a high-pressure air bag, and the lower half portion of the interior of the energy accumulator contains high-pressure hydraulic oil. The second hydraulic cylinder is connected with the oil tank through a hydraulic oil pipe C. A solenoid valve is connected with the flame detection module through a signal control line. The flame-detection based emergency cutoff linear motion valve device isapplicable to the linear motion valve and can emergently cut off connection between the storage tank and the oil inlet / outlet pipe when actively detecting flames under a fire state.

The invention discloses a spheroidal graphite cast pipe position detection and proportional valve control automatic protection system and method. The spheroidal graphite cast pipe position detection and proportional valve control automatic protection system comprises a centrifugal machine system, a pipe drawing tongs system and a ladle turning system, wherein the centrifugal machine system, the pipe drawing tongs system and the ladle turning system each comprise a position detection system and a proportional valve control system, and code disc crash, number hopping, number exceeding, damage and line faults in the detection system and jamming, number exceeding and internal leakage faults in the proportional valve are automatically judged and processed, so that corresponding automatic protection for the fault problems is realized. The spheroidal graphite cast pipe position detection and proportional valve control automatic protection system has a good protection effect on control related to position and speed such as code disc line faults, code disc faults and proportional valve out-of-control, and the effect is obvious.

The invention discloses a method for detecting cracking of a weld seam of a withdrawal and straightening machine. A grating detector is installed in the rear of a last correction roller in front of the withdrawal and straightening machine of a pickling and rolling combined unit to detect a steel strip, wherein an emitter of the grating detector emits light source signals, a receiver of the grating detector receives the light source signals, due to blocking of the steel plate (steel strip), the grating detector cannot sense the signals, the fact that the grating detector senses the signals shows that a weld seam cracking phenomenon of the steel plate arises, and an emergency stop signal is sent by the grating detector to a production line; and the receiver of the grating detector is in a shape of a long strip, and the emitter of the grating detector can move freely along a guiding rail. The invention aims to provide the method for detecting cracking of the weld seam of the withdrawal and straightening machine. By means of the method for detecting cracking of the weld seam of the withdrawal and straightening machine, the grating (grating detector) can detect weld seam situations of the steel plate in time, and whether or not the production line needs an emergency cut-off is judged according to the weld seam situations of the steel plate, so that the production efficiency is improved, and the accident time is shortened.

The invention discloses an exposed-roof radial gate system provided with stoplog type anti-flooding sliding gate leaves and a gate opening and closing method. According to the main technical scheme, gate grooves are formed in gate piers on the two sides of an exposed-roof radial gate; a plurality of stoplog type sliding gate leaves, the first bottom water seal device is installed at the bottom of the stoplog gate leaf, the first side water seal devices are installed on the two sides of the upstream face of the stoplog gate leaf, the sliding mechanism is installed on the stoplog gate leaf and enables the stoplog gate leaf to slide in the gate groove, and the first transverse limiting mechanism is installed on the stoplog gate leaf. The top-exposed arc-shaped gate comprises an arc-shaped gate leaf and an arc-shaped side rail pre-buried on the side edge of the downstream gate pier; and the opening and closing device comprises a dam crest portal crane rotary hoisting mechanism for hoisting and placing the stoplog type gate leaf, two lifting driving mechanisms for enabling the stoplog type gate leaf to move up and down in the gate groove, and a radial gate opening and closing driving mechanism for driving the radial gate leaf to be opened and closed.