56results about How to "Increased safety margin" patented technology

The invention provides an alternating-current fault ride-through control method for modularized multi-level direct-current energy consumption devices, and the method comprises the steps: enabling the modularized multi-level direct-current energy consumption devices to form a dual symmetric control mechanism, enabling the two multi-level direct-current energy consumption devices to be symmetrically arranged, and enabling the two multi-level direct-current energy consumption devices to be respectively connected to a positive wire and a negative wire; the energy consumption resistor Rd is centrally arranged outdoors, and two ends are respectively connected with the n sub-modules; the direct-current energy consumption device comprises an energy consumption resistor and a plurality of sub-modules with built-in switching tubes, and according to the method, the provided sub-modules have the alternating-current fault ride-through function by controlling the on-off states of the switching tubes in the sub-modules; the stability and reliability of the power supply system can be improved, and the complexity of the system can be reduced.

The invention belongs to the technical field of nuclear fuel assembly design, and particularly relates to a high-safety fuel assembly capable of measuring temperature and conducting strong flow guiding. Comprising a temperature-measurable instrument tube, a strong flow-guiding grillwork, a fuel rod, a guiding tube, a foreign-matter-catching-preventing lower tube seat, a low-pressure-drop upper tube seat and a connecting structure thereof. Through the arrangement of the structure and the connection of all the components, the high thermotechnical safety margin of the fuel assembly is realized. By arranging the temperature-measurable instrument tube, a temperature sensor can be placed in the temperature-measurable instrument tube, the temperature of a coolant entering the temperature-measurable instrument tube from the radially uniformly distributed drain holes can be continuously measured on line in real time, the actual thermotechnical safety margin of the fuel assembly can be known, operation can be fed back, operation strategy optimization can be guided, and transient state and low accident incidence of the fuel assembly are realized; by measuring and feeding back the coolant temperature of the hot spot part of the fuel assembly, the fuel assembly and the power plant can operate at safe and as high as possible parameters for a long time based on the mastered safety margin, and the economical efficiency of the nuclear power plant is improved.

The invention discloses a low-voltage ride-through control method considering voltage measurement delay estimation, and the method comprises the steps: carrying out the modeling of a typical vector control system of a doubly-fed wind power system, obtaining a reactive power output limiting condition, and carrying out the building of a voltage measurement equipment output model, on this basis, a cosine interpolation fitting method is adopted to accurately estimate the time delay of a voltage measurement device for the grid-connected point voltage of the doubly-fed fan, and after accurate time delay estimation is determined, the time delay is substituted into a low-order time delay compensation control link, so that the power instruction of the doubly-fed fan is compensated. According to the method, the actual voltage delay of the grid-connected point is accurately estimated, and a voltage measurement delay compensation method is adopted to optimize a voltage control strategy of the doubly-fed fan, so that the problem of overvoltage of the grid-connected point caused by delay of a voltage measurement link is reduced.

The invention discloses a waste tire continuous thermal cracking feeding control method and system based on machine learning, and relates to the technical field of plastic waste recovery. The method comprises the following steps: acquiring a historical rear end socket temperature sequence and a historical internal pressure sequence of a cracker in a historical time window, and a rotation angular velocity and feeding rate sequence in a future preset time window; on the basis of the long and short-term memory network, predicting a predicted end socket temperature sequence and a predicted internal pressure sequence in a future window; with improvement of temperature, pressure and feeding rate stability as multiple targets, an adaptive feeding rate sequence is searched and output in a feeding rate adjustment space through digital twinborn simulation and an intelligent optimization algorithm in combination with the prediction sequence; and finally, carrying out feeding control on the cracker according to the sequence in a preset time window. According to the method, prospective optimization control over the cracking working condition is achieved, the hysteresis quality of traditional control is effectively overcome, and the stability, safety and automation level of the continuous thermal cracking process are improved.

The present invention relates to the field of nuclear fuel technology, and specifically discloses a high-reliability fuel assembly with coordinated flow control, including a lower tube seat, a skeleton, an upper tube seat, and fuel rods, guide tubes, and instrument tubes inserted into the skeleton, which are sequentially arranged along the flow direction of the coolant; the lower tube seat is a low-outlet lateral flow lower tube seat; on the lower tube seat connecting plate, there are a number of space-through slender flow channels with a width less than the fuel rod spacing and axial bending; the outlets of the surrounding flow channel areas of the space-through slender flow channels located on the outer periphery of the lower tube seat connecting plate are higher than the outlets of the middle flow channel areas located in the middle of the lower tube seat connecting plate, so as to reduce the lateral flow of the outlets between assemblies. The present invention carries out a coordinated and innovative design of the fuel assembly as a whole, and ensures a high thermal safety margin of the fuel assembly.

The application discloses an electric energy-frequency modulation out-clearing method and system considering energy storage energy state elasticity, comprising the following steps: acquiring power grid topology, load prediction data and power grid operation constraint parameters, receiving the frequency modulation market declaration information and the electric energy market declaration information submitted by market subjects; determining the winning frequency modulation capacity and the frequency modulation mileage out-clearing price of each market subject according to a preset frequency modulation out-clearing rule; taking the frequency modulation market out-clearing result as a boundary condition, constructing an electric energy market out-clearing model considering energy storage energy state elasticity, setting the state of energy (SOE) of the energy storage operator at the end time as an optimization variable, and introducing the SOE adjustment cost curve into the objective function; solving the model to determine the day-ahead time node marginal price, the day-ahead time generation power of the generation unit operator, the day-ahead time charging and discharging power of the energy storage operator and the SOE at the end time, and converting the same into a power grid dispatching instruction; and performing frequency modulation market settlement and electric energy market settlement according to the out-clearing result.

The invention relates to the technical field of cables, in particular to an ultra-high temperature resistant elastic wall flat cable, which has a flat structure and is woven with a cable core as a braided yarn and an inorganic fiber as an axis yarn; the cable core comprises, from the inside to the outside, a conductor, a polyimide film insulation layer, a first mica tape sheath, an illite-based aerogel felt, a second mica tape sheath and an aramid fiber sleeve in sequence; the flat structure enables the cable to be arranged neatly and occupy less space; in the case of limited internal space of a missile, the space can be more effectively utilized, the occupied area of ​​the cable can be reduced, and the layout can be optimized; the cable is more convenient to install and maintain, and can more easily pass through narrow spaces and complex wiring paths; during maintenance, it is also easier to troubleshoot and replace the cable; the cable can withstand instantaneous jetting of ultra-high temperature flames and can work stably for a period of time in a high temperature environment.

The steam turbine cylinder pawl pressing device is characterized in that: a connecting bolt is used to connect a pressing block, a disc spring set, an adjusting gasket I, an adjusting gasket II, a special nut, a cylinder pawl and a bearing box, so that a downward load is applied to the cylinder pawl without affecting the relative sliding of the cylinder pawl and the bearing box, the safety margin of the cylinder stability is further improved, and the cylinder pawl floating is avoided.

The invention discloses a path planning method and device based on a variable expansion coefficient, and a storage medium. The path planning method comprises the following steps: obtaining state information of a vehicle and environment obstacle information; according to the state information of the vehicle, a dynamically-changing expansion coefficient is calculated, and the dynamically-changing expansion coefficient is at least in positive correlation with the current speed of the vehicle; performing expansion processing on an obstacle by using the dynamically changing expansion coefficient to generate an expansion area; generating a group of candidate paths based on the road reference line; candidate paths intersecting with the expansion area are removed, and an optimal path is selected from the remaining candidate paths to serve as an obstacle avoidance track; and outputting the obstacle avoidance track to a vehicle control system for execution. According to the method, the expansion coefficient dynamically related to the vehicle speed, the steering angle, the path curvature and other factors is designed, self-adaptive adjustment of the safety distance is achieved, and therefore the obstacle avoidance track which is safer and smoother and better conforms to the vehicle dynamic characteristics is generated.

The invention provides a magnetic suspension bearing motor structure and method, the magnetic suspension bearing motor structure comprises a motor stator (2) arranged in a shell (1) and a rotor (3) which is arranged in a center shaft area of the motor stator and is provided with a thrust shaft shoulder (32), and a bearing structure of the rotor comprises a radial magnetic suspension bearing (5) and an axial magnetic suspension bearing (6) which are arranged from inside to outside; the rotor is of an integrated rotating shaft structure formed by assembling and combining a rotating shaft and a permanent magnet, and the thrust shaft shoulders are arranged at the two ends of the integrated rotating shaft structure. In a magnetic circuit of the axial magnetic suspension bearing, the axial magnetic suspension bearing forms an axial magnetic field capable of being coupled with a thrust shaft shoulder of the rotor through a magnetic conducting ring (62) of the axial magnetic suspension bearing, and axial magnetic force is applied to the thrust shaft shoulder, so that the rotor is kept stable in the axial direction during operation; according to the invention, the design of the magnetic suspension bearing motor without the thrust disc can be realized.

The present invention provides a reinforced core material for a fan blade, comprising a core material and reinforcements distributed inside the core material. The reinforcements comprise one or more first reinforcements and one or more second reinforcements that are spaced apart from each other and alternately distributed, wherein the first reinforcement and the second reinforcement extend transversely to the length direction of the reinforced core material, the tensile modulus and tensile strength of the first reinforcement are greater than the tensile modulus and tensile strength of the second reinforcement respectively, the first reinforcement is formed via resin infiltration on one or more fibers of the same or different shapes, and the second reinforcement is a synthetic high polymer.

The utility model discloses an eVTOL airplane aileron structure, including aileron framework and the aileron skin that wraps in aileron framework outside. Aileron framework includes the beam of exhibition, chord rib, rudder angle and a plurality of suspension joint, and the beam of exhibition is composed of web and the edge strip of web upper and lower two sides. Rudder angle is composed of connecting portion and ear piece, and the web inside surface of beam of exhibition is fixed with suspension joint, and a plurality of suspension joint symmetrical setting is in the two sides of rudder angle, and the through -hole is set up on suspension joint. Chord rib includes two end ribs, a plurality of ordinary ribs and a plurality of leading edge ribs, and the aileron skin is composed of upper skin, lower skin and three connecting band plate. In the utility model aileron structure, the main body structure of rudder angle is connected in the inside of aileron, only the connecting ear piece of rudder angle is exposed in the air, and the wind area is very small, and the aerodynamic drag is small. Meanwhile, the other side of the beam of exhibition is designed with reinforcing joint in the position corresponding with rudder angle, and the reinforcing joint and rudder angle are connected together by fastener through the web of beam, and the connecting strength is high.

Embodiments of the present disclosure disclose a trajectory planning method, device, equipment and medium for a full-hanging truck train, the method comprising: obtaining a tracking deviation model for determining a first deviation vector of a target tractor and a second deviation vector of a target full-hanging trailer, and then constructing a trajectory optimization problem according to a safety margin evaluation function related to an actual state vector, safety constraints and the tracking deviation model, iteratively solving an initial reference trajectory in a region to be planned through the trajectory optimization problem, evaluating the safety margin by simultaneously considering the deviations of the tractor and the full-hanging trailer in the iterative solving process, obtaining an optimal target control quantity sequence, and then obtaining a target reference trajectory with the maximum passing safety margin, so that the full-hanging truck train composed of the tractor and the full-hanging trailer can pass with a larger safety margin, improving the safety of the full-hanging truck train passing through a narrow area.

This invention discloses a dynamic optimization method for the topology of a USV-AUV cooperative navigation network based on a consensus algorithm, relating to the field of cooperative navigation technology for marine unmanned systems. The method includes: constructing the relationship between the positioning error of the AUV and the distance measurement errors between the surface unmanned surface vessels (Surface UVs) and AUVs, and the positional errors between the Surface UVs, based on the positioning equations between the Surface UVs and AUVs using partial differential equations; designing a positioning accuracy evaluation function using optimal estimation criteria; obtaining the optimal solution for the evaluation function using the alternating direction multiplier method; simultaneously estimating the consistency of the formation center using a consensus algorithm and adjusting the dynamic formation parameters to obtain the optimal topology; and continuously acquiring the number of formation vehicles in real time. If the number of formation vehicles changes, the method iterates; if the number of formation vehicles does not change, the topology is maintained. This invention exhibits strong dynamic adaptability, constrained cooperative optimization, improved safety margin, and enhanced robustness.

The application discloses a construction method of a drag-reducing isolation structure applied to a precast pile, and belongs to the technical field of pile foundation construction, which comprises a precast pile, a drag-reducing isolation material, an isolation protective layer, a cement-soil pile, an energy circulation channel and an energy medium pump; the drag-reducing isolation material is uniformly distributed on the surface of the precast pile, the isolation protective layer is wrapped outside the precast pile and the drag-reducing isolation material, the cement-soil pile is outside the isolation protective layer and is bonded between the isolation protective layer; the energy circulation channel is arranged inside the precast pile, and the energy circulation channel and the energy medium pump are connected through a pipeline. The construction steps are as follows: precast pile manufacturing; drag-reducing isolation material manufacturing; isolation protective layer manufacturing; drag-reducing isolation material smearing; isolation protective layer wrapping; cement-soil pile construction; implanted precast pile processing; energy circulation reduces and eliminates negative friction drag; and continuous maintenance. The application can reduce the influence of negative friction drag on the precast pile through multiple active drag reduction, and has good engineering application value and popularization value.

A 50MW level heat pump energy storage system matching - 60 DEG C exhaust low temperature turbine belongs to the field of steam turbine design, in order to solve the problem that the low temperature turbine in the existing 50MW level heat pump energy storage system has poor flow efficiency and insufficient thermal performance in work, the application comprises a cylinder body, a rotor is inserted in the cylinder body, both ends of the rotor extend to the outside of the cylinder body, and both ends of the rotor are inserted into corresponding No. Bearing box or No. Bearing box, a No. Baffle sleeve and a No. Baffle sleeve are symmetrically installed on the inner wall of the cylinder body, and the No. Baffle sleeve and the No. Baffle sleeve are coaxially arranged with the rotor, two blade groups are symmetrically arranged in the cylinder body by double split flow mode, a plurality of moving blades in each blade group are installed on the rotor, a plurality of static blades in each blade group are installed on the No. Baffle sleeve or the No. Baffle sleeve, and the application is mainly used as a low temperature turbine matched in the 50MW level heat pump energy storage system matching.

The invention provides a steam generator heat transfer tube wear prediction and intelligent tube blocking method and system. The method comprises the steps that flow fields, vibration fields and wear databases of a heat transfer tube under different working conditions and positions are constructed through analogue simulation and real overhaul data of a nuclear power plant; constructing a training sample based on the constructed flow fields, vibration fields and wear databases of the heat transfer tube under different working conditions and positions; respectively training the flow field prediction model, the vibration field prediction model and the wear coefficient prediction model; during the unit overhaul period, operation data of a steam generator, position information of each heat transfer pipe and a supporting plate and corresponding abrasion data are obtained; respectively carrying out pretreatment; utilizing the trained flow field prediction model, vibration field prediction model and wear coefficient prediction model to predict the wear depth during the next overhaul; and judging whether the predicted wear depth during the next overhaul reaches or exceeds a set threshold value, and triggering and controlling the automatic pipe plugging operation when the wear depth reaches or exceeds the threshold value.

The invention belongs to the technical field of elevator anti-falling, and particularly relates to a freight elevator with a car anti-falling brake mechanism, which comprises a freight platform, a safety clamp, a traction rod, a sleeve, a speed limiting index and an auxiliary clamp, the freight platform is arranged at the bottom of a car and used for carrying passengers, and guide rails are arranged on two sides of the freight platform; the two safety tongs are arranged at the bottom of the cargo carrying platform, ascending connecting rod mechanisms for triggering linkage are arranged on the side faces of the safety tongs and used for enabling the safety tongs to grasp the guide rail, the traction rod is arranged between the two safety tongs, the two ends of the traction rod are connected to the ascending connecting rod mechanisms on the safety tongs respectively, and the sleeve is arranged on one side of each ascending connecting rod mechanism. The sleeve is used for limiting the movement range of the ascending connecting rod mechanism, and the sleeve is arranged outside the speed limiting index in a sleeving mode and is in sliding fit with the speed limiting index. Two-stage braking can be achieved, it is ensured that multiple sets of braking units respond quickly and synchronously during triggering, the safety margin is prolonged, reliable parking within a preset distance is achieved, and the safety of personnel and equipment is guaranteed.

The present invention discloses a contact matching structure of an electrical switch, including a static contact and a moving contact parallel to each other, an arc contact and a main contact being arranged on the moving contact, the arc contact being located at the outer end of the moving contact, and an angle being formed between the edges of one side of the static contact and the moving contact that are close to each other in the open state, so that the arc contact contacts the static contact before the main contact during the closing process. The arc contact of the moving contact of the present invention contacts the static contact first when closing the switch, and is disconnected last when opening the switch, so that most of the burnout is concentrated on the arc contact, and the position of the ablation point of the moving contact is effectively controlled; the pit design of the static contact increases the safety margin of the slag accumulation of the arc contact exceeding the height of the main contact, and increases the closing reliability; the space in the moving contact movement direction is not occupied, so that the space utilization rate in the moving contact movement direction is higher, the design opening distance is increased, and the product performance is improved.

The present application relates to a kind of importance field closed-loop driven radar point cloud real-time detection ranging system and method, belong to automatic driving environment perception.Solve the problems of poor real-time, low ranging accuracy, insufficient detection ability for special target and weak system robustness in prior art.Through cross-frame information multiplexing, invalid point cloud is pre-judged and filtered, detection feedback closed-loop is guided to balance efficiency and accuracy by hierarchical sampling, and the robustness is improved by calculating geometry to drive direction enumeration to fit bounding box, and accurate distance is calculated based on surface projection to replace center point estimation.Importance field is throughout the whole link of pre-judged filtering, hierarchical sampling, bounding box fitting and accurate ranging, forming a positive cycle.After system integration, the computing load is reduced, the perception reliability and safety in complex environment are enhanced, and the automatic driving and robot perception needs in various complex environments are adapted.

The application belongs to the technical field of control, and particularly relates to a kind of water-soluble fertilizer production preparation self-adaptive control method and system, method includes: the state parameter in reactor is collected, and after normalization, constitute multidimensional state vector;Through Gaussian process regression, the nonlinear mapping between current state and control input and state change is established, and the trace of predictive covariance matrix is used to represent posterior uncertainty index;Establish a stochastic differential equation containing Brown motion and compound Poisson process as a state space model, associate volatility, jump intensity and posterior uncertainty index to represent unmodeled dynamic risk;For concentration, pH value and temperature constraints, construct a stochastic control barrier function, and derive high probability safety constraints based on Itô-Lévy formula;With the minimum control cost and index deviation as the goal, a convex optimization problem is constructed, and the control amount is solved online to regulate the feeding, stirring and temperature control equipment, so as to consider the control cost, index deviation and production safety.

The invention relates to a disturbance scene-oriented load response strategy modeling and evaluation method and system, belongs to the technical field of intelligent power systems, and solves the problems of insufficient load prediction precision, user response modeling precision and strategy robustness evaluation. The method comprises the following steps: predicting a multi-scale prediction load sequence and high-frequency disturbance characteristics based on an original electric vehicle load and related auxiliary data; obtaining a response score based on the predicted load sequence and the high-frequency disturbance characteristics; constructing a double-layer master-slave game model to calculate an electricity price excitation strategy and a multi-microgrid adjustment power path based on the response score, the prediction load sequence, the system economic parameters and the constraint parameters; and in a multi-class extreme electric vehicle load scene, calculating a robustness index to evaluate a unified robustness score, and taking the unified robustness score as a feedback signal to adjust a response score or an electricity price excitation strategy and a multi-microgrid adjustment power path. And closed-loop linkage of prediction-behavior-economic game and robustness evaluation is realized.

The invention relates to the technical field of rack rail railway operation and maintenance, in particular to a multi-sensor fusion rack rail railway foreign matter cleaning system which comprises a sensing module with a first radar, an image acquisition device and a second radar, and the first radar and the image acquisition device are installed at preset positions of the upper portion of a train head. The first radar and the image acquisition equipment are used for acquiring train front environment data; the second radar is installed at the bottom of the train head and used for collecting data of foreign matter between racks and tooth grooves. The decision-making module is electrically connected with the sensing module, and the decision-making module is used for processing data collected by the sensing module and outputting an instruction; and the execution module is electrically connected with the decision module, and is used for cleaning the rack rail according to an instruction of the decision module. According to the multi-sensor fusion rack rail railway foreign matter cleaning system, the operation safety, reliability and passing efficiency of a rack rail train in a complex mountain environment are improved.

The application discloses a superconducting charging cable of fault current limiting type, and mainly solves the problems that existing superconducting cables cannot be used for bidirectional direct-current high-power charging and have complex structures. The superconducting charging cable comprises a cable framework and liquid nitrogen passage (1), a composite conductor layer (2) and a thermal insulation shell (3). The cable framework supports the composite conductor layer and the thermal insulation shell. The composite conductor layer is composed of inner and outer superconducting tape layers and inner and outer fault current limiting stabilizing layers, and is wrapped on the cable framework. The inner composite conductor layer and the outer composite conductor layer are separated by using an intermediate layer insulating bushing, so that the bidirectional direct-current charging function of the superconducting cable is realized. The fault current limiting stabilizing layer is armored on the superconducting tape layer, so that the fault current limiting function of the superconducting cable is realized. The thermal insulation shell is wrapped on the outer liquid nitrogen bellows, so that the heat leakage of the cable body to the outside is greatly reduced. The superconducting charging cable has a compact structure, does not need to use a fault current limiter, and can be used for connecting electrode terminals to perform high-power direct-current fast charging on electric vehicles.

This invention provides a nonlinear optimization control method, system, device, and readable storage medium. The method includes: constructing a quadratic programming subproblem at the current iteration point; the quadratic programming subproblem includes an approximate objective function and approximate constraints; solving the quadratic programming subproblem; if the feasible region of the quadratic programming subproblem is empty, determining the set of candidate directions that minimizes the constraint violation, and determining the direction that minimizes the approximate objective function in the candidate direction set as the target search direction; determining the iteration step size based on the target search direction, and determining a new iteration point based on the target search direction and the iteration step size. Compared with existing technologies, the control command sequence output by this invention naturally conforms to Newton's laws of mechanics, and the aircraft control system can execute it seamlessly; at the same time, this invention significantly reduces the parameter adjustment burden and human error risk for ground control personnel.

The invention provides a photovoltaic AVC substation time-phased control method and device considering an assessment rule, and relates to the technical field of power grid automatic voltage control. The method comprises the following steps: determining a current control time period of a photovoltaic AVC substation according to a received command moment of a power grid regulation and control center AVC master station and an assessment rule; and determining the current control mode of the photovoltaic AVC substation according to the current control time period of the photovoltaic AVC substation, and performing adjustment control according to the current control mode of the photovoltaic AVC substation. Thus, different control modes are adapted in different time periods according to the assessment rules, the requirement of the station for voltage safety is met, the requirement of the dispatching master station for reactive voltage regulation of the new energy station can be met, the effect of the station for autonomously optimizing voltage regulation can be fully played, the three modes promote each other, the safety margin of the station voltage is improved, and the safety of the station voltage is improved. And meanwhile, the assessment cost is avoided.

The embodiment of the invention discloses a tunnel counter-slope excavation drainage construction method which comprises the following steps: constructing a certain distance in a tunnel after construction of a tunnel portal is completed, and completing primary support; constructing a drainage pipeline by using a horizontal directional drill, wherein the pipeline is parallel to the tunnel and is slightly lower than or equal to the excavation bottom elevation of the tunnel; the pipeline is gradually dismantled in the tunnel excavation process, so that a water inlet of the drainage pipeline follows the long sub-surface until the tunnel is communicated; after the tunnel is communicated, low-grade concrete can be selected to be backfilled in the pipeline or reserved for other purposes according to the design. By means of the construction method, the safety margin during construction can be effectively increased, the construction efficiency of tunnel reverse slope excavation is improved, and the effects of energy conservation, emission reduction and green construction can be achieved when the electricity consumption of water pumping and drainage is large.

This invention relates to a control method for preventing the aggravated deviation of the inlet looper strip in continuous unwinding, comprising the following steps: Step 1: Inspect the appearance, shape, and information of the coil being fed in advance; Step 2: Set the central section process speed according to the process requirements of the subsequent strip, simultaneously meeting the feeding and threading time of the subsequent strip and considering the running status of the subsequent strip shape; Step 3: Feed and thread the subsequent strip to the welding machine during the online operation of the preceding strip; Step 4: After the uncoiler is completed online, use the time of pulling the inlet looper at the central section speed to automatically decelerate to a stop, unload, and shear the strip; Step 5: Ensure that the inlet looper is filled to the set value when the inlet unwinding is about to be completed; Step 6: Monitor the deviation of the hydraulic cylinders of the inlet section #1 CPC and the looper CPC; Step 7: Ensure the longest possible coil change time at the inlet; Step 8: After the inlet looper is filled, ensure stable operation of the unit. This ensures stable and high-speed operation of the production line.

The invention discloses a GIS equipment intelligent heat tracing band constant temperature maintaining device and method, and relates to the technical field of power system control, and the device comprises a front end heat tracing band unit which is used for wrapping and heating GIS equipment; the switching control unit is used for selecting a heating tape switching strategy according to the acquired temperature information; and the background monitoring unit is used for summarizing and displaying the temperature state of the in-station equipment and the switching state of the heating device. The outside of the GIS equipment is wrapped and heated through the front-end heat tracing band unit, the front-end heat tracing band unit is controlled through the switching control unit, constant-temperature control is carried out on the GIS equipment, and control information and temperature information are sent to the background monitoring unit for remote real-time monitoring. The connecting mode of the heat tracing assembly can be expanded or reduced according to the actual situation, and the heat tracing assembly has the significance that the heat tracing assembly adopts a modular production mode, is installed, dismantled and maintained in a standardized mode, reduces the maintenance amount and improves the safety margin of equipment.

The utility model discloses an airplane sewage outlet sewage pipe butt joint auxiliary device, include: connecting ring, it is used to set and fixed on the butt joint of sewage pipe, and connecting ring is sheet structure and its outside is equipped with at least two clamps, handheld piece is the hollow structure of two ends opening, and the connecting end of handheld piece is fixed on the inside of connecting ring and the diameter of its holding end is greater than the diameter of connecting end, wherein, when connecting ring installs on butt joint, the hose of sewage pipe is arranged on handheld piece. The utility model can improve the convenience of butt joint operation, guarantee the connection quality of sewage pipe on sewage outlet, reduce the risk that the airport is polluted by sewage due to the falling of sewage pipe in the use process.