447results about How to "Safe and stable operation" patented technology

The invention discloses a method for calculating the influence sensitivity of multiple stations and multiple control parameters on the short-circuit current of an alternating current system, and the method comprises the steps: building a calculation data model of the short-circuit current of a power grid, and enabling the model to comprise at least one new energy or energy storage device equivalent to a controlled current source; based on the calculation data model and the independent variable selected by each station, utilizing an iteration method to calculate the short-circuit current increment of each station; calculating the short-circuit current of each station fault point according to the short-circuit current increment; and calculating a sensitivity index of the independent variable relative to the short-circuit current of the specified fault point according to the short-circuit current.

The invention provides a flywheel energy storage system with an electromagnetic coupler, which comprises a motor, a flywheel rotor, the electromagnetic coupler, a frequency converter and a generator, and is characterized in that the motor is connected with the flywheel rotor to drive the flywheel rotor to rotate, the electromagnetic coupler comprises an outer rotor and an inner rotor, and the outer rotor sleeves the inner rotor and is spaced from the inner rotor; the flywheel rotor is in transmission connection with the inner rotor, the inner rotor generates a rotating magnetic field to drive the outer rotor to rotate, and the frequency converter is connected with the outer rotor to change the current frequency of the outer rotor so as to change the magnetic field rotating speed matched with the current, so that the mechanical rotating speed of the outer rotor is kept constant. The generator generates power, accesses the power grid and inputs electric energy with stable frequency into the power grid, the requirement of power transmission to the power grid is met, power electronic devices are not needed, rotational inertia in the power grid can be improved, necessary voltage and frequency support is provided for the power grid, and the capacity of the power grid for efficiently accepting new energy is improved.

The invention discloses a hydraulic structure risk assessment method based on a multilevel dynamic fuzzy Bayesian network, and relates to the technical field of hydraulic engineering safety monitoring, and the method comprises the following steps: recognizing risk factors of a hydraulic structure, and building a hierarchical hydraulic structure risk assessment system; a Bayesian network risk probability model is constructed based on a risk assessment system, nodes in the model correspond to indexes of each layer of the assessment system, and edges among the nodes are connected according to a causal relationship among the indexes. According to the invention, accurate and dynamic management and control of hydraulic structure risks are realized. In the aspects of data processing and risk judgment, multi-source monitoring data such as displacement, seepage and water level are classified and integrated according to an index layer, a criterion layer and a target layer through hierarchical evaluation system design, the isolation problem of traditional single data monitoring is avoided, the data collaboration value is fully mined through logic association among the layers, and the risk judgment accuracy is improved. And the risk assessment does not depend on one-sided information any more.

The invention belongs to the technical field of power system monitoring, and particularly relates to an intelligent monitoring method and system for an unattended substation, and the method comprises the steps: obtaining an infrared radiation gray-scale map of a detected equipment region, the temperature of a detected equipment monitoring point, and the load current of a loop; for any monitoring point, the temperature rise inertia is determined according to the temperature variation in the observation window at the current moment and the load current square difference value of the loop; determining the coherence degree of the thermal field by using a gradient operator; fusing the temperature rise inertia and the thermal field coherence degree, and determining a deviation energy value; and triggering early warning in response to the condition that a sequence formed by the deviation energy values of the monitoring points at the current moment and a plurality of historical moments before the current moment meets a monotone increasing trend. According to the method, environmental interference is decoupled through multi-dimensional feature fusion, the false alarm rate is remarkably reduced, and early-stage high-sensitivity early warning of the hidden thermal defect of the transformer substation is achieved.

This invention provides a method and system for intelligent load control in ammonia synthesis production based on wind and solar forecasting, relating to the fields of energy and chemical production technology. The method includes collecting wind and solar data and ammonia synthesis process data; using a dual-current variational autoencoder combined with a residual connection mechanism to predict power generation curves and process parameter trends; determining process parameter constraints and safety boundaries; establishing a process parameter safety constraint model; obtaining the load adjustment space; generating optimal load commands based on optimization algorithms; and achieving intelligent load control through cascaded PID control. This invention achieves precise dynamic control of the load on ammonia synthesis units, improving wind and solar energy absorption capacity and production efficiency.

The invention relates to the technical field of coal chemical industry, in particular to a method for evaluating the slag quantity of a dry pulverized coal gasifier in real time, which comprises the following steps: arranging a thermometer in a slag pool of the dry pulverized coal gasifier, arranging a thermometer and a flowmeter behind a quenching water heat exchanger, and arranging a regulating valve on a cooling water outlet pipeline of the quenching water heat exchanger; adjusting the outlet flow Q of the slag water circulating pump to be a constant value according to the reading of the flowmeter; the temperature t of the quenching water after the quenching water heat exchanger is controlled to be a constant value by using a regulating valve and a temperature controller of a cooling water outlet pipeline; based on the principle that the specific heat capacity of quenching water and molten slag and the temperature of the molten slag before quenching are constant, the real-time slag production amount of the gasifier is calculated through a preset formula, the method for evaluating the slag production amount of the dry pulverized coal gasifier in real time can evaluate the slag production amount of the dry pulverized coal gasifier in real time, guide personnel to carry out as-fired coal operation adjustment, and improve the slag production amount of the dry pulverized coal gasifier. Frequent fluctuation of the slag yield of the gasifier is avoided, and safe and stable operation of the burner cover and the slag conveyor is ensured.

The application discloses a pipeline threat behavior identification method and device and a storage medium, and relates to the technical field of machine vision. The method comprises the following steps: acquiring a to-be-detected video photographed by unmanned aerial vehicle inspection; performing target detection on image frames of the to-be-detected video, determining target detection boxes of detection objects in the image frames and target categories of the detection objects; performing trajectory tracking on the target detection boxes to obtain target trajectories of the detection objects; extracting behavior features of the detection objects, wherein the behavior features comprise morphological change features of the detection boxes and trajectory features of the target trajectories of the detection objects; and identifying pipeline threat behaviors of the detection objects based on the target categories, the behavior features of the detection objects and a pre-trained classification model. The method can effectively detect small targets such as personnel and vehicles, effectively determine threat behaviors such as personnel loitering, personnel digging and mechanical digging, and the algorithm has the light-weight feature.

This invention discloses a method and apparatus for predicting power supply equipment faults based on deep learning, relating to the field of power system equipment fault prediction and deep learning application technology. The method includes: acquiring power grid topology, equipment operating status, historical fault records, real-time equipment load, and environmental condition data; constructing a spatiotemporal correlation graph based on the power grid topology and equipment operating status, and calculating the correlation strength using a graph neural network; combining the correlation strength and historical fault records, calculating the fault time delay using a long short-term memory network and determining the set of propagation paths; fusing multiple data points to calculate the cross-regional fault propagation probability and generating a list of predicted fault paths; updating the fault prediction output input to the long short-term memory network, and verifying and optimizing it using real-time power grid operating data to achieve accurate prediction of cross-regional cascading faults, ensuring the safe and stable operation of the power grid.

The application discloses a kind of high-low voltage complete switchgear monitoring system and method, it is related to switchgear monitoring technical field;Real-time load current data of target switch cabinet and the temperature data corresponding to preset node are collected, input reduced-order proxy model obtains the temperature value of each node in the three-dimensional space inside switch cabinet and constructs digital twin temperature field;Digital twin temperature field is mapped as two-dimensional pseudo-color temperature distribution image;Two-dimensional pseudo-color temperature distribution image is input to preset detection network model and carries out intelligent monitoring.By collecting real-time load current inside switch cabinet and preset node temperature data, combined with thermoelectric coupling reduced-order proxy model, the three-dimensional space temperature field in cabinet is directly reconstructed, and the fault type and confidence level are automatically output by using color mapping and detection network, thereby effectively overcoming the shell shielding effect, realizing early, accurate, non-invasive online monitoring of internal core heating site, significantly improving the timeliness and reliability of fault warning.

The utility model provides a compressor rear end cover coating and a compressor rear end cover, and belongs to the technical field of compressors. The compressor rear end cover coating comprises a bottom layer bonding layer and an insulating layer, the bottom layer bonding layer is attached to a compressor rear end cover, the insulating layer is arranged on the bottom layer bonding layer, and the insulating layer comprises PEEK paint. The coating is good in adhesive force and excellent in insulating property, and can meet the use requirements of the compressor.

The application belongs to new energy and energy-saving technology, and specifically discloses a temporary building air-conditioning heating operation optimization method, device, equipment and medium; the temporary building thermodynamic model is built based on the building structure of the temporary building and the heat transfer principle, and the heat dissipation of the temporary building can be simply calculated through the model. By introducing the environmental factor, the heating model of the air conditioner is further optimized, and the heating effect of the air conditioner is more accurately calculated. Finally, taking the power consumption of the temporary building as the optimization target, a temporary building air-conditioning operation optimization model is constructed, the model is solved, and the curve of the number of air conditioners started in the temporary building changing with temperature is obtained. According to the outdoor temperature and the curve, the start-stop state of the indoor air conditioner is adjusted, so that the energy saving and environmental protection are realized while the heat load demand is met.

The application discloses an environmental protection gas load switch and belongs to the electrical equipment field, which is used to solve the problem of how to inhibit or eliminate the arc generated when the static contact and the moving contact of the load switch are disconnected. The environmental protection gas load switch comprises a shell, a moving contact, an operating mechanism, a first static contact and an arc extinguishing device. The moving contact is rotatably arranged in the interior of the shell, the operating mechanism is used for controlling the rotation of the moving contact, and the first static contact is fixedly arranged in the interior of the shell. The arc extinguishing device comprises a shell body, a rotating arm, a vacuum bubble and a reset spring, the shell body is fixedly arranged on the shell, the rotating arm is rotatably arranged on the shell body and is provided with an electrically conductive part, the electrically conductive part is arranged on the rotating path of the moving contact, the vacuum bubble is arranged on the shell body, and the two ends of the vacuum bubble are electrically connected with the electrically conductive part and the first static contact respectively, and the reset spring is arranged between the rotating arm and the shell body. When the moving contact is disconnected with the first static contact, the moving contact is electrically connected with the electrically conductive part.

The application discloses a data-driven optimal control method for a grid-connected inverter. The method comprises the following steps: constructing a DeePC optimization controller of the grid-connected inverter on the grid side; acquiring a data matrix of the grid-connected inverter in a preset historical period and an initial trajectory after a preset adjacent period, inputting the controller, setting parameters for different control targets and types of the grid-connected inverter, outputting an optimal input data sequence after processing, generating a sinusoidal pulse width modulation wave signal and acting on the grid-connected inverter, and realizing data-driven optimal control. The method can automatically perceive and adapt to the dynamic characteristics of the actual power grid through real-time data-driven predictive control, can present or enhance the control behavior of the grid-constructing or grid-following inverter by modifying the cost parameters, can realize multi-mode flexible, optimal and coordinated control, has excellent dynamic response and steady-state performance, is beneficial to safe and stable operation, and improves the ability to adapt to complex and variable operating conditions and power grid strength.

This invention provides a system for monitoring and removing scale from the inner wall of HVAC water pipes, belonging to the technical field of HVAC systems. It includes HVAC water pipes, with an auxiliary removal component installed on the outer wall of the pipes to use ultrasonic vibrations to peel scale off the inner wall. In use, the auxiliary removal component allows the ultrasonic transducer to receive a high-frequency electrical signal from an ultrasonic generator, generating high-frequency mechanical vibrations. These vibrations propagate rapidly along the wall of the HVAC water pipe and are transmitted to the water inside and the scale adhering to the inner wall. Under the action of the high-frequency ultrasonic vibrations, the scale gradually peels off the inner wall, achieving the purpose of scale removal without causing significant mechanical impact or damage to the HVAC water pipe itself. Long-term use will not affect the strength and sealing of the HVAC water pipes, ensuring their safe and stable operation.

The invention relates to the technical field of primary and secondary fusion pole-mounted circuit breakers, and discloses a primary and secondary fusion pole-mounted circuit breaker, which comprises a circuit breaker main body and a mounting rack, the circuit breaker main body is arranged on the mounting rack, the mounting rack comprises an adjusting plate and a mounting seat, the mounting seat is arranged on a telegraph pole, the adjusting plate is provided with a rotating shaft, and the rotating shaft is arranged on the mounting seat. The rotating shaft is rotationally connected to the mounting base, a clamping block is arranged on the rotating shaft, a fixing sleeve is arranged on the rotating shaft, a plurality of fixing blocks are slidably connected to the fixing sleeve, the fixing blocks abut against the fixing sleeve in the circumferential direction, a fixing assembly is arranged on the fixing sleeve, and driving springs are arranged on the fixing blocks; according to the application, the adjusting plate can be kept horizontally installed without being influenced by an inclined telegraph pole, so that the installation direction of the circuit breaker main body is prevented from being inclined, the problems of mechanism deformation, aggravated abrasion or jamming possibly caused by long-term uneven stress of the circuit breaker main body are prevented, and the equipment reliability and the safe and stable operation of a power grid are further improved.

The utility model discloses a hydrogen production and hydrogenation integrated device, and relates to the technical field of hydrogen production, the hydrogen production and hydrogenation integrated device comprises an electric heater, a hydrogen-water separation device, a hydrogenation device and a passage switching assembly, the hydrogen-water separation device is used for outputting first to-be-treated hydrogen; the hydrogenation device is used for outputting second to-be-treated hydrogen; two input ends of the passage switching assembly are respectively connected with the hydrogen-water separation device and the hydrogenation device, and an output end of the passage switching assembly is connected with an input end of the electric heater; the access switching assembly is used for controlling the hydrogen-water separation device to be communicated with the electric heater, so that the electric heater performs heat treatment on the accessed first to-be-treated hydrogen; or, the hydrogenation device is controlled to be communicated with the electric heater, so that the electric heater conducts heat treatment on the accessed second to-be-treated hydrogen. Therefore, the electric heater can run all the time, the time required by cold start preheating is eliminated, and the problem that the cold start time is too long is effectively solved.

The invention provides a parameterization calculation method for a top cover modal and a pitch diameter of a water turbine, and belongs to the technical field of hydraulic mechanical structure dynamics and simulation automation. The method comprises the steps of parameter input, parametric modeling, automatic simulation control, pitch diameter identification and analysis and result output: after a parameter set is input, constructing a parametric modeling module based on Python and ANSYS Spaceclaim, and automatically generating a three-dimensional geometric model containing a basic panel, a rib plate and a connecting hole; an automatic simulation control module is constructed based on Python and ANSYS Workbench, and full-process automatic simulation is completed to obtain a modal analysis result; pitch diameter characteristic parameters are automatically recognized through a least square discrete Fourier transform algorithm of non-equiangular sampling and confidence degree judgment; and outputting results to form a standardized database. According to the method, automation and quantification of the whole process are achieved, modeling and simulation efficiency is improved, manual misjudgment is avoided, the method is suitable for different types of water turbine top covers, and reliable data support is provided for structural optimization and resonance risk assessment.

The utility model relates to the technical field of generator equipment, and discloses a generator set drainage device with a water accumulation prevention structure, which comprises a waterproof cover, a plurality of pulleys are fixedly connected in the waterproof cover, a generator base is slidably connected in the waterproof cover, a first sliding chute is arranged outside the generator base, and a second sliding chute is arranged outside the generator base. The exterior of the generator base is fixedly connected with a diesel engine, the exterior of the diesel engine is fixedly connected with a water tank, the bottom of the water tank is fixedly connected with a drainage mechanism, the exterior of a waterproof cover is fixedly connected with a fixing block, and the exterior of the fixing block is fixedly connected with an adjusting mechanism. And the drainage mechanism comprises a drainage pump. According to the anti-blocking device, the anti-blocking plate is driven by the drainage pump to move, so that the anti-blocking plate rotates in the connecting pipe, then the air cylinder drives the push plate to move, the drainage pump is automatically started, damage of accumulated water to the generator set is avoided, and safe and stable operation of equipment is ensured.

This invention belongs to the field of water electrolysis for hydrogen production technology, and particularly relates to a water electrolysis device system and its usage method that separates alkali solutions at the hydrogen and oxygen ends. The system includes an electrolyzer body, a composite isolation unit, a hydrogen-side alkali solution circulation unit, an oxygen-side alkali solution circulation unit, a hydrogen-side deionized water supply device, an oxygen-side alkali solution supply device, an online monitoring unit, and a central control system. The composite isolation unit includes a hydrogen-side alkali solution chamber and an oxygen-side alkali solution chamber, with an intermediate composite isolation component between them. This component includes a strong alkali-resistant ceramic base frame, an ion-selective permeation membrane, and an elastic sealing edge. The ion-selective permeation membrane allows anions to pass through while blocking cations. Both the hydrogen-side and oxygen-side circulation units include a circulation pump module, a temperature-controlled heat exchange module, a monitoring module, and a gas-liquid separator. The temperature-controlled heat exchange module includes an electric heating unit and a plate heat exchange unit. The online monitoring unit and the central control system achieve closed-loop control and abnormal early warning by comparing target parameters with actual parameters.

The application provides a high-power hydrogen energy mobile charging device, which comprises a hydrogen storage system configured to store and provide hydrogen; a fuel cell system configured to receive hydrogen from the hydrogen storage system and generate power by using the hydrogen; a charging system configured to receive, control and distribute the power generated by the fuel cell system; and a terminal device configured to receive power from the charging system and charge external power-consuming devices by using the received power, wherein at least part of the power from the fuel cell system is used to drive the movement of the mobile charging device. The mobile charging device can solve many problems existing in conventional diesel and energy storage battery mobile charging devices, meet the demand of high-power power-consuming devices and large-capacity charging in some application occasions, and solve the problems of multi-system integrated control, safety monitoring and management.

The application relates to the technical field of circuit breaker detection, and specifically discloses a circuit breaker action characteristic detection system based on artificial intelligence, which comprises a data acquisition layer, a data preprocessing layer, a data analysis layer, a decision warning layer and a system management layer; the data acquisition layer is responsible for collecting the action characteristic parameters of the circuit breaker. Through filtering, normalization and feature extraction, the data quality and availability are improved, laying a foundation for subsequent analysis; the data analysis layer uses comprehensive calculation and analysis to evaluate multidimensional parameters in mechanical action, obtains a mechanical action state evaluation coefficient, and accurately grasps the operation state of the circuit breaker; the decision warning layer accurately determines the operation state and timely warns according to the evaluation result and a threshold value, helping operation and maintenance personnel to quickly respond; and the system management layer is used for dynamically optimizing a feedback determination threshold value, so that the overall scheme effectively improves the accuracy, reliability and intelligent level of circuit breaker detection, reduces fault risks, and guarantees the safe and stable operation of a power system.

The invention provides a vibration screen spring fault diagnosis method and device. The method comprises the steps that an original vibration signal of a vibration screen spring is collected through a vibration sensor; extracting a time-frequency characteristic signal from the original vibration signal; utilizing a pre-trained feature fusion neural network model to extract spatial features and time features from the time-frequency feature signals; fusing the spatial features and the time features to obtain fused features; and inputting the fusion features into a pre-trained fault classifier, and outputting a fault diagnosis result. The time features and the space features of the signals are extracted through the feature fusion neural network model, finally, the features are fused to achieve spring fault diagnosis, vibration screen spring faults can be diagnosed timely and accurately, and the method has great significance in guaranteeing safe and stable operation of a coal dressing production system.

The utility model provides a kind of weeding device for extra-high voltage converter station, it is related to weeding equipment field.The weeding device for extra-high voltage converter station includes: main frame, one end of the main frame is provided with knife groove, the other end is connected with insulating rod;Setting in one end of the main frame, and located in the scythe one side of the knife groove;Setting in one end of the main frame, and located in the cutting knife other side of the knife groove, one end of the cutting knife is rotatably connected with the main frame, and the other end is connected to the end of insulating rod by movable assembly.The utility model's scheme realizes the quick cleaning of grass plants and tree plants in extra-high voltage converter station field area, improves the security of user in the process of weeding in extra-high voltage converter station field area, and guarantees the safe and stable operation of power grid.

The invention belongs to the technical field of transient analysis of a new energy grid-connected system, and particularly relates to a transient overvoltage analysis method of a direct-driven wind power grid-connected system under an asymmetric fault, which comprises the following steps: acquiring three-phase asymmetric voltage and current, and constructing a positive and negative sequence dq control model of positive and negative sequence bisynchronization of a direct-driven wind power plant station; establishing a mapping relation with a symmetric component method, and determining a positive-sequence dynamic reactive current increment and a negative-sequence current suppression coefficient according to a converter control strategy; establishing sequence network boundary conditions under various asymmetric faults; enabling the direct-driven wind power plant to be equivalent to a frequency-related controlled sequence impedance source, and obtaining equivalent sequence impedance of the wind power plant; establishing a sequence network equation considering wind power dynamic support; calculating the current and sequence voltage of the fault point, and obtaining a three-phase voltage through symmetric component inverse transformation; and an overvoltage coefficient is calculated, and a quantitative relational expression between the overvoltage coefficient and the negative-sequence current suppression coefficient is established and applied. The method provides theoretical support for parameter setting and capacity planning of the wind power integration system.

The application discloses a kind of suitable for SCR denitration ammonia injection device and device, including ammonia injection pipe and the ammonia injection port of setting at ammonia injection pipe end, ammonia injection pipe includes ammonia main pipeline, branch pipeline and branch pipeline;Along ammonia main pipeline circumferential direction, equidistantly there are several branch pipelines;In branch pipeline, equidistantly and parallelly there are several vertical branch pipeline branch pipelines;Several branch pipelines are in the same plane, plane vertical branch pipeline;In branch pipeline, there is vertical plane ammonia injection port;Ammonia injection port gas outlet direction is same with ammonia main pipeline inner gas flow direction.The ammonia injection device suitable for SCR denitration designed in the application, including branch pipeline and branch pipeline, ammonia injection pipeline because each part branch pipe length is small, and the difference of branch pipeline diameter is not big, so it can reduce the flow resistance of ammonia in pipeline.

The invention provides a clearing scheduling method, system, equipment and medium for a pumped storage unit participating in a spot market in consideration of water head influence, and the method comprises the steps: analyzing the actual operation data of a pumped storage power station, and respectively constructing a relation model of the maximum pumping and generated output of the unit and a water head; determining a water head value of the unit in the time period t, and calculating the maximum water pumping output and the maximum power generation output of the unit in the time period t through the relation model; obtaining declaration information that the unit participates in the spot goods electric energy market, making a plurality of constraint conditions by using the calculated maximum output, carrying out spot goods electric energy market clearing operation based on the plurality of constraint conditions and the declaration information, and obtaining an output plan of a t + 1 time period; and performing loop operation to obtain an output plan curve of the unit on the operation day. The method ensures that the output result accords with the actual operation condition of the pumping and storage unit, improves the accuracy of the output calculation result and the clearing optimization result of the unit, and guarantees the execution reliability of the pumping and storage output plan.

The invention relates to the technical field of image recognition, and discloses a wind power fan blade defect recognition method and system based on image recognition, and the method comprises the steps: carrying out the blocking cutting, illumination normalization and image enhancement processing of an original image, constructing a defect-free sample and a defect sample, and dividing the samples into a training set and a test set; the method comprises the following steps: taking a GANopen network as a basic framework, fusing the lightweight design of Mamba-YOLO, constructing a joint loss function by adversarial loss, reconstruction loss and coding loss based on a training set, carrying out unsupervised training, optimizing network parameters until convergence, and obtaining a defect identification model; inputting the preprocessed to-be-detected fan blade image into the trained defect recognition model, performing defect recognition and positioning, and outputting the defect type and position; based on an output result of the defect identification model, dynamically adjusting an early warning level and response measures through a self-adaptive early warning mechanism; according to the invention, the efficiency and accuracy of wind power fan blade defect identification are improved.

The utility model discloses a kind of terephthalic acid filtering devices, including shell, the shell is installed on external equipment, pressure regulating mechanism is provided on the shell, the pressure regulating mechanism includes water inlet pipe, spacer, filter bag and water outlet pipe, the water inlet pipe and water outlet pipe are respectively installed in the both sides of the shell, the spacer is installed in the shell, the water inlet pipe is connected in the upper layer of spacer, the water outlet pipe is connected in the lower layer of spacer, overflow pipe is equipped with on the water inlet pipe, this innovative terephthalic acid filtering device is through the intelligent pressure regulating system of careful design, effectively solve the technical problem that filter bag in traditional equipment is damaged due to pressure fluctuation, realizes the safe and stable operation of production process, and its core technical advantage lies in introducing an automatic pressure regulating mechanism, can respond to the fluctuation of feed pressure in real time, and automatically start pressure relief protection when pressure exceeds safety threshold.

The utility model discloses a ventilation module of a tank container and the tank container, comprising a ventilation pipe connected to a ventilation port of the tank container; the ventilation head is arranged at one end, far away from the ventilation opening, of the ventilation pipe; the ventilation head is provided with a head pipe body connected with the ventilation pipe, a cover body covering the upper end of the head pipe body and a filter screen located in the head pipe body. The cover body is provided with an upwarp part located on the periphery, and a ventilation opening is formed between the upwarp part and the head pipe body. When the volume of an oil product in the tank box changes, air can enter and exit from the tank box through the vent pipe via the vent hole of the vent head, so that the balance of air pressure inside and outside the tank box is effectively maintained, and the problems of tank box deformation, difficult oil inlet or unsmooth oil outlet caused by abnormal air pressure are avoided; and safe and stable operation of the tank is ensured. The filter screen is arranged in the ventilation head, dust, impurities and other particles in air can be filtered out in the process that the air enters and exits the tank box, the particles are prevented from entering the tank box to pollute oil products, the quality of the oil products is guaranteed, and the impurities are prevented from damaging oiling equipment and oiled machinery.

The utility model discloses a universal connecting device for preventing a lead from loosening. The universal connecting device comprises a shell main body, a universal main clamp, a top block, a fixed block, a first screw, a second screw, a lead half frame, a bottom cover, a spring and the like. A universal main clamp is mounted in the shell main body, two grooves are formed in the universal main clamp, a first limiting groove and a second limiting groove are formed in each groove, two fixing blocks are mounted through the first limiting groove, and two ejection blocks are slidably connected through the second limiting groove; a lower shell and an upper shell are installed on the front side wall and the rear side wall of the shell body correspondingly, and a spring is arranged between the top block and the fixing block. Through the above structure, the lead loosening prevention device can effectively prevent the lead from loosening, has good versatility and overcurrent capability, is suitable for connection of leads of various specifications, is convenient to install and maintain, is compact and reasonable in structure, and can prolong the service life.