2569 results about "Electric shock" patented technology

The invention belongs to the technical field of electrical safety, and particularly relates to a human body electric shock protection method and system based on multi-parameter fusion, multi-dimensional characteristic parameters are formed by extracting a high-frequency harmonic component, a voltage abrupt change slope and a magnetic field intensity fluctuation value of a residual current waveform, and the weight is dynamically adjusted according to the instantaneous change rate of each characteristic, so that the human body electric shock protection is realized. Generating a weighted feature vector; and a comprehensive criterion value is calculated in combination with a preset rule base and is compared with a dynamic threshold value, so that whether the circuit breaker is triggered to act or not is determined. According to the method, through fusion analysis of a plurality of physical characteristics, the identification capability of the system in a complex electromagnetic environment is improved, the probability of misoperation caused by external interference is effectively reduced, the action accuracy and stability of the circuit breaker are improved, and the power utilization safety and the power supply continuity are guaranteed.

A tool for hanging and disassembling a grounding wire of a power transmission line tower through an unmanned aerial vehicle comprises the unmanned aerial vehicle, a detachable connecting rod frame is installed on the unmanned aerial vehicle, and two hanging rings are connected to the bottom end of the connecting rod frame. And the high-altitude falling risk and the induced electric shock hidden danger caused by manual tower climbing are thoroughly eliminated. An operator can perform remote control on the ground and is prevented from being directly exposed to a high-voltage electric field and a severe tower environment, so that the life safety of the operator is fundamentally guaranteed, and the system conforms to the development trend of'few-person and unmanned 'operation and maintenance of an intelligent power grid. The unmanned aerial vehicle can quickly pass through complex terrains to approach an operation point, is particularly suitable for special tower positions such as mountainous areas and cross rivers, greatly improves the operation efficiency, and remarkably improves the operation safety. A traditional manual grounding wire hanging and dismounting mode is changed, the device is not influenced by the terrain and the tower type, the operation process is convenient and fast, the maintenance operation time is shortened, the labor intensity is reduced, and the personal safety is ensured.

The invention discloses a construction site personnel electric shock prevention early warning method and system fusing UWB and AI. The method comprises the following steps: acquiring data of spacing between personnel and electrified equipment in real time, eliminating multipath interference by adopting a subspace projection algorithm, and generating an optimized distance in combination with a self-adaptive Kalman filtering algorithm; constructing a multi-dimensional trend vector fusing the distance change rate, the environmental parameters and the equipment voltage, and inputting a voltage-sensitive LSTM model to predict a dynamic risk probability; and calculating a dynamic safety threshold based on voltage-risk nonlinear mapping, and triggering a three-level early warning mechanism. Through multi-path interference suppression, dynamic risk assessment and a grading early warning system, accurate safety management and control in a high-risk environment are realized, the early warning precision and response speed of a high-voltage operation scene are remarkably improved, and the false alarm rate is reduced to 3% or below.

A mouse trap comprises a shell, which comprises a base and an upper shell mounted above the base, wherein an electric shock device, a mouse pressing device and a locking device are arranged in the shell; the electric shock device comprises a conductive element, the mouse pressing device is movably mounted on the top wall of the shell and extends downwards towards the base, and the bottom end of the mouse pressing device is positioned above the conductive element of the electric shock device.

The invention provides a photovoltaic system and power distribution network state cooperative monitoring method based on the Internet of Things, and the method comprises the steps: deploying a multi-point collection device in a key region of a photovoltaic power station through a sensor network, and obtaining the soil humidity change and soil conductivity at regular time; denoising and standardizing the acquired soil humidity change and soil conductivity data to generate a standardized environmental parameter matrix; according to the dynamic change trend of grounding grid corrosion, identifying the mapping relation between the soil environment parameters and the grounding resistance value, and combining the real-time environment parameters and the corrosion trend to predict the resistance change; and comparing the predicted resistance change with the current grounding resistance value in real time, if the current grounding resistance value is detected to exceed a safety threshold range, triggering an abnormal early warning signal, and determining a potential area with high electric shock risk according to the resistance deviation degree and the corrosion rate.

AED pulse generation circuits that provide floating, adjustable, bias voltages for driving a solid-state defibrillation waveform therapy generator circuit are provided. The provided bias voltages allow to reverse polarity of provided electric shock to increase chances of successful defibrillation and survival. In one of the provided configurations, energy stored in the pulse capacitor can be discharged by activating the waveform therapy generator in the high-resistance transconductance region. The circuits can be positioned on a self-contained module potted with an insulating material to reduce unintended interactions with other AED components. Through the use of the disclosed circuits, AED size can be reduced to promote pocketability while simultaneously increasing AED reliability.

The utility model relates to the technical field of outdoor high-voltage vacuum circuit breakers, and discloses an outdoor high-voltage vacuum circuit breaker with an isolating switch, the top of a base is fixedly connected with a circuit breaker body, the middle part of the front side of the base is fixedly connected with a fixed shell, and the two sides of the fixed shell are fixedly connected with electric push rods. A clamping plate is fixedly connected to one side of the electric push rod, a connecting base is fixedly connected to the middle of the front side of the circuit breaker body, a winding roller is rotatably connected to the interior of the connecting base, an electric wire is arranged on the winding roller, and an isolating switch is fixedly connected to the bottom of the electric wire; a servo motor, a winding roller, an electric wire and the like are arranged to be matched with the disconnecting switch for use, the servo motor drives the winding roller to rotate so as to unwind the electric wire, the electric wire drives the disconnecting switch to move downwards so as to move to the position below the circuit breaker body, and therefore the danger of electric shock caused by an operator in the using process can be prevented; and a response can be conveniently and quickly made in an emergency.

The present invention relates to the technical field of distribution cabinets, and discloses an anti-electric shock outdoor distribution cabinet, including a distribution cabinet, in which a power-off switch is installed. The distribution cabinet further includes: a wiring groove opened on the power-off switch, and a wiring post is arranged in the wiring groove; an extension part fixed below the power-off switch and corresponding to the wiring groove, an insulating strip is installed on the extension part, a power connection fork is rotatably installed at the top of the insulating strip through a torsion spring, and the torsion spring applies a torsional force to the power connection fork to move it away from the wiring post, and a wire is threaded through the power connection fork and extends from its end, and an insulating wrapping layer is provided at the top of the insulating strip away from the wiring post. When the power-off switch cuts off the power, the present invention can not only disconnect the wire from the wiring post, but also insulate and wrap the exposed part of the wire, avoiding the risk of electric shock to the maintenance personnel during subsequent maintenance caused by the residual current that the exposed wire may carry, and reducing potential safety hazards.

The invention provides a cable fault arc temperature distribution calculation method based on multi-physics field coupling, and the method comprises the steps: building a cable fault arc simulation model; setting boundary conditions of multi-physics field coupling of an electric field equation, a magnetic field equation, a fluid heat transfer equation and a laminar flow equation for the cable fault arc simulation model; the arc temperature distribution is obtained by controlling the voltage and current parameters of the arc simulation loop, the distance between the copper core conductor and the grounding electrode and the air velocity. A cable fault arc simulation model is built, high risks of electric shock and explosion in laboratory tests are avoided, the loss cost of laboratory test equipment is reduced, the defect that only the peripheral temperature of the arc can be measured in the laboratory tests is overcome through a multi-physics field coupling equation, and global continuous arc temperature data are obtained. And a theoretical basis is provided for power system protection design, cable laying optimization, fire-fighting strategy formulation and cable fire risk assessment.

The invention discloses a high-voltage test hall anti-electric shock early warning system and method based on multi-source data fusion, and the system comprises an electric field dynamic monitoring module which is used for collecting and calibrating electric field data through a distributed three-axis field intensity sensor array, and predicting the field intensity distribution through the combination of an ARIMA-GRU hybrid model; the UWB-IMU cooperative positioning module adopts a TOF-TDOA-AOA algorithm to fuse inertial data so as to realize the positioning of a tester; the vital sign abnormity detection module is used for monitoring body surface leakage current and physiological parameters; the three-dimensional real scene modeling module constructs a dynamic safety boundary based on laser SLAM; the fuzzy comprehensive evaluation decision module dynamically allocates weights through an LSTM-ATT model and calculates risk indexes; and the multi-stage emergency linkage control module executes graded power-off response. Through multi-source data fusion and dynamic threshold adjustment, quick power-off response and full-scene risk management and control are realized, the false alarm rate is reduced, and high-voltage test electric shock accidents are effectively prevented.

This application provides a power conversion apparatus and an insulation impedance detection method. The insulation impedance detection circuit is connected to the direct current bus and the ground, and the isolation switch is connected to the insulation impedance detection circuit and the alternating current voltage detection circuit. The controller is configured to control the isolation switch to be turned on, and control the insulation impedance detection circuit to detect a voltage between the direct current bus and the ground, to obtain an insulation impedance based on the voltage. The controller is further configured to control the isolation switch to be turned off before controlling the insulation impedance detection circuit to detect the voltage, to protect a person from suffering an electric shock and hand numbness due to touching the output end of the inverter circuit.

The utility model discloses a miniature circuit breaker, which comprises a shell provided with an arc extinguish chamber. The arc extinguish chamber is connected with an upper arc striking sheet; the upper arc striking sheet comprises an upper arc striking sheet conductive section and an upper arc striking sheet arc striking section; the conductive section of the upper arc striking sheet is made of copper, and the arc striking section of the upper arc striking sheet is made of iron; the upper arc striking sheet conductive section and the upper arc striking sheet arc striking section are connected through a solder layer; a moving contact plate used for being matched with the upper arc striking sheet is arranged in front of the upper arc striking sheet, and an electric shock part used for being in contact with the upper arc striking sheet is arranged on the moving contact plate. The moving contact plate is made of copper-iron-phosphorus alloy.

The invention relates to the field of discharge gun temperature control adjustment, and discloses a self-adaptive temperature control adjustment and overload protection method for a discharge gun, which comprises the following steps of: collecting relevant parameters of the discharge gun and performing data preprocessing to construct a discharge gun temperature prediction model, and combining the discharge gun temperature prediction model to obtain a discharge gun temperature prediction model; and performing overload prediction judgment on the target discharge gun, performing fuzzy PID temperature control adjustment on the overloaded target discharge gun, and finally performing adaptive temperature control adjustment in combination with an adaptive optimization module. Extreme risks such as fire, electric shock and battery explosion can be avoided, the service life of the discharge gun and the battery is prolonged, and equipment shutdown caused by overheating or protection outage is avoided.

The invention relates to the technical field of circuit breakers, in particular to a primary and secondary fusion complete column-mounted circuit breaker which comprises a mechanism box, a plurality of insulating cylinders fixed to the top end of the mechanism box and a supporting frame transversely fixed to the inner wall of one side of the mechanism box. A plurality of hanging rings are fixed to one side of the top end of the mechanism box, a limiting sliding groove is formed in the supporting frame in a penetrating mode, an inclined triggering assembly is arranged in the limiting sliding groove, and through arrangement of the inclined triggering assembly and an adjusting assembly and cooperative operation between the inclined triggering assembly and the adjusting assembly, the inclined triggering assembly can be adjusted; when a telegraph pole is inclined due to the influence of extreme weather or external force, the primary and secondary fusion complete column-mounted circuit breaker can automatically separate the moving contact from the static contact, so that quick power failure is realized, manual intervention is not needed in the process, the circuit can be cut off at the first time when a dangerous case occurs, and the safety of the telegraph pole is ensured. The electric shock risk possibly encountered when pedestrians approach the inclined telegraph pole is avoided fundamentally, and the overall use safety is improved.

The invention relates to the technical field of electric power connectors, and discloses a convergence clamp. The convergence clamp comprises a handle, a conductive chuck and a clamping assembly, the handle comprises a driving mechanism which is used for driving the clamping assembly. The clamping assembly comprises a fixed block, a sliding block and a clamping mechanism, the fixed block is fixedly connected to the conductive chuck, the sliding block is slidably connected to the conductive chuck, and the clamping mechanism is rotatably connected to the fixed block and is slidably connected to the sliding block to clamp the copper bar; the driving mechanism is connected with the sliding block and is used for driving the sliding block to move along the extension direction of the conductive chuck so as to enable the clamping mechanism to realize clamping or loosening action; and the clamping mechanism and the end part of the conductive chuck are enclosed together to form a clamping space for clamping a copper bar. The convergence clamp is convenient to operate, and clamping can be controlled by rotating the handle. The handle made of insulating materials guarantees safety and avoids electric shock. The clamping assembly is flexible and adjustable and can adapt to copper bars of different specifications.

The invention relates to the technical field of welding, and provides a low-load voltage circuit and a lithium battery welding machine. The circuit comprises a main control module, a voltage detection unit, a switching circuit, a pulse modulation unit and a current sampling feedback unit. The voltage detection unit monitors the end voltage of a welding gun of a welding machine in real time, the switching circuit limits the output voltage to be smaller than a safety threshold value of 36 V in a no-load mode, and a built-in bidirectional thyristor achieves isolation of a high-voltage loop and a low-voltage loop. The pulse modulation unit adjusts the on-off frequency of a main power loop, and the current sampling feedback unit dynamically adjusts the pulse duty ratio so as to accurately control the welding current. The lithium battery welding machine integrates the circuit and is provided with a welding gun assembly, a main transformer and a power supply module, the electric shock risk is effectively reduced, and the welding quality and efficiency are improved.

The utility model discloses an automatic mounting device, which relates to the technical field of automatic mounting devices, and comprises a mechanical arm component, a flexible finger component and a locking component, the mechanical arm component comprises a first mechanical arm and a second mechanical arm; the flexible finger part is connected with the first mechanical arm, and the flexible finger part is used for clamping or loosening a battery pack busbar; the locking component is connected with the second mechanical arm, the end, away from the second mechanical arm, of the locking component is used for being connected with the locking piece, and the second mechanical arm can rotate so as to drive the locking component to rotate. In this way, manual installation is not needed, the risk of electric shock of operators is avoided, the safety of the operators is guaranteed, and compared with the mode that the busbar is manually placed on the battery pack and the busbar and the battery pack are manually locked through the locking piece, the structure achieves full-automatic operation, the operation efficiency is greatly improved, and the labor intensity of workers is lowered. And the locking depth of each position locking piece and the placement position of the bus bar are consistent, so that the aesthetic property can be improved. The utility model further discloses an automatic installation system.

The invention discloses an application method and system of an intelligent electroscope in marketing operation, and the system employs a non-contact electric field sensing module to detect the power-on state of an electric power line, avoids manual contact measurement, reduces the risk of electric shock of personnel, carries out the filtering and feature extraction (time domain and frequency domain features) of an electric field signal through a data processing unit, and improves the detection precision. A machine learning model (such as SVM and DNN) is combined to train historical data, real electrified signals and interference signals can be effectively distinguished, and detection errors are reduced; electricity testing data remote transmission is achieved by means of a wireless communication module, task issuing, automatic result uploading and abnormal alarm are completed in combination with a marketing operation system, manual recording and feedback are not needed, the problems that remote confirmation is difficult and information transmission lags behind in a traditional mode are solved, and intelligence and high efficiency of electricity marketing operation are improved; the positioning module records the geographic position of the electricity testing point and synchronizes the geographic position to the marketing operation system, thereby facilitating operation flow tracing and task overall scheduling, and optimizing the marketing operation flow.

The invention relates to the technical field of leakage protectors, in particular to a leakage protector convenient to install and capable of using electricity safely, which comprises a leakage protector main body, a plurality of wire inlet holes used for connecting wires are formed in the outer side of the top of the leakage protector main body, and binding mechanisms are fixed to the tops and the bottoms of the outer sides of the wire inlet holes. The binding mechanism comprises a supporting plate, two connecting rods are rotationally arranged at one end of the supporting plate, and a rubber wheel is rotationally arranged between the two connecting rods. According to the electric leakage protector, the pulling resistance of the wire is increased through the two rubber wheels, the phenomenon that the wire is pulled off is reduced, when the wire is pulled by large force to move, a copper wire of the wire moves into the elastic bag, an electric shock accident is prevented, and the use safety of the electric leakage protector is improved; and meanwhile, the rubber wheel rotates and winds the traction belt along with the movement of the wire, the traction belt pulls the elastic bag to tension the outer side of the elastic bag, and a user observes the tensioning phenomenon of the elastic bag to conveniently check whether the wire is pulled out of the mounting position.

The utility model relates to the field of handcart type switch devices, in particular to a valve device with a padlock and a switch cabinet. The padlock mechanism is used for solving the problem that an existing padlock mechanism is arranged on a valve, a worker needs to operate the padlock mechanism on the valve in a cabinet, and the risk of electric shock exists. The valve device with the padlock comprises a valve frame, a valve and a transmission mechanism are arranged on the valve frame, the transmission mechanism is provided with an action input component used for being matched with a circuit breaker handcart so as to transmit actions to the valve when the circuit breaker handcart is pushed, and the valve frame further comprises a handcart guide rail. A blocking and locking piece is movably arranged at the position, close to the front end, of the handcart guide rail, the blocking and locking piece has an unlocking state and a locking state for avoiding or blocking the circuit breaker handcart, and a padlock structure is arranged on the blocking and locking piece and is kept in the locking state after padlock. The blocking lock piece is arranged at the front end position of the handcart guide rail, so that a worker is prevented from entering the cabinet to be in contact with a valve which is possibly electrified, the operation is convenient, and the safety is improved at the same time.

The invention discloses a pepper field prodenia litura adult trapping and killing device and method. The pepper field prodenia litura adult trapping and killing device comprises an AI adult prediction system, an insect trapping device, a high-voltage power grid killing device, an insect corpse collecting device and an energy supply device. The AI adult prediction system is in communication connection with the insect trapping device and is used for monitoring prodenia litura adults in real time and sending a starting signal to the insect trapping device; the insect trapping device carries a prodenia litura sex attractant and is used for releasing the prodenia litura sex attractant to trap adults of prodenia litura after receiving the opening signal; the high-voltage power grid killing device is used for killing adults through cooperation of contact electric shock and air electric shock; the insect corpse collecting device is arranged below the high-voltage power grid killing device and is used for collecting killed insect corpses; the energy supply device is electrically connected with the AI adult prediction system, the insect trapping device and the high-voltage power grid killing device and supplies power to all electric components. Non-chemical, accurate, environment-friendly and efficient trapping and killing of the prodenia litura adults in the pepper field and stable and long-acting operation of the device are realized.

The invention provides an automobile mosquito protection system and method based on a negative pressure airflow barrier, and the system comprises an airflow generation module which comprises at least one fan arranged at an automobile door frame and is used for generating airflow flowing from the interior of a passenger compartment to the exterior of an automobile; and the air guide structure communicates with the airflow generation module and is used for forming a negative pressure airflow barrier covering the vehicle door opening at the vehicle door opening. An airflow barrier is established at the moment of opening of the vehicle door, mosquitoes are prevented from entering from the source, and passive is changed into active; a pure physical airflow expelling mode is adopted, no chemical substance or high-voltage electric shock risk exists, the air quality in a vehicle is preferentially monitored, and the health of passengers is guaranteed; intelligent control is carried out based on double signals of the vehicle door opening degree and biological recognition, and the protection effect, energy consumption and noise are effectively balanced; core components of the system are designed in a hidden integrated mode, and the appearance and getting-on and getting-off convenience of the vehicle are not affected.

The utility model discloses a modularized assembly type outdoor distribution box based on electric shock prevention, relates to the technical field of distribution boxes, and aims to solve the problems that an existing device cannot isolate external connection wires, increases the risk of electric shock, and is difficult to prevent dust and water vapor from entering the box, and comprises a distribution box, and the rear side of the distribution box is provided with an external connection wire electric shock prevention assembly. The external wiring anti-electric shock assembly comprises a connecting cylinder, a hole is formed in the rear side of the distribution box, the front end of the hole is fixedly connected with the bottom end of the connecting cylinder, an anti-electricity shell frame is fixedly connected to the front end of the connecting cylinder, an annular piece is arranged in the anti-electricity shell frame, and a plurality of convex holes are formed in the inner side of the annular piece. The modularized assembly type outdoor distribution box based on electric shock prevention disclosed by the utility model has the technical effects of isolating external connection wires, reducing electric shock risks, ensuring personal safety, preventing dust and water vapor from entering the distribution box body, avoiding influencing the operation of electrical equipment, and improving the safety and stability of a distribution system.

The present invention relates to a leakage current suppression system for an alternating-current power system. The leakage current suppression system comprises: a variable-frequency compensation control module, which regulates the frequency and signal amplitude in a circuit on the basis of an equipotential feature of a consumer loop of a power system, in order to match load characteristics and achieve dynamic signal amplitude fixation; a real-time monitoring module, which is used for monitoring the frequency, current and voltage of the power system; a central processing unit, which processes data from the monitoring module, and executes data analysis to identify frequency and current variations in the case of current leakage or electric shock; and a leakage current suppression module, which is connected to the real-time monitoring module and is configured with a mechanism which is automatically activated when frequency and current abnormalities are detected, and is used for dynamically adjusting a circuit response to suppress a leakage current. The modules are connected in parallel to the consumer loop, perform rapid adaptive tuning compensation for the parallel frequency resonance in a load loop, and dynamically regulate the current phase and amplitude, so that a zero potential difference at a target load end and current suppression for a target load are achieved, and a suppression and shielding effect on circuit leakage is achieved.

An electric leakage protection system includes: a first Y capacitor and a second Y capacitor connected in series; a power battery, wherein a positive electrode of the power battery is connected to a first end of the first Y capacitor and the second Y capacitor which are connected in series, and a second end of the first Y capacitor and the second Y capacitor which are connected in series is separately connected to a negative electrode of the power battery and a negative electrode of a DC charging port; and a controller configured to: when acquired electric leakage-related parameters meet preset electric leakage protection conditions, control an energy leakage loop to avoid an electric shock.

The invention discloses a laser wire feeding additive-layer impact peening composite manufacturing device and method, and the device comprises an additive manufacturing module, an environment control module, a movement conversion module, an impact peening module and an integrated control system. The integrated control system is connected with the additive manufacturing module, the environment control module, the movement conversion module and the impact strengthening module through signal lines, state signals of all the modules are collected and analyzed in real time, operation instructions are given according to the preset process and logic, and it is ensured that all the modules are tightly matched and efficiently run. The advantages of the laser coaxial wire feeding technology and synchronous layer-by-layer laser shock peening are combined, the workpiece forming quality and precision are guaranteed, meanwhile, the macromechanical property of a workpiece is improved, in the laser shock peening process, a common flowing water limiting layer is abandoned, the electric shock risk caused by the flowing water limiting layer and the pollution problem to the workpiece are avoided, and the production efficiency is improved. The simplicity and the safety of the manufacturing device are obviously improved, and the production efficiency and the operation convenience are improved.

The present invention belongs to the technical field of electrical devices. Disclosed is a primary-secondary integrated smart ring main unit. The smart ring main unit comprises a mechanism chamber, cable bushings, an explosion-proof valve seat, a cable chamber, an operating mechanism, a switch linkage lock, a linkage mechanism, a low-voltage cabinet, umbrella-skirt bushings, and a circuit-breaker apparatus, wherein the several cable bushings are mounted on a top plate of the cable chamber; the explosion-proof valve seat is mounted on the top plate of the cable chamber; the mechanism chamber is mounted above the cable chamber; the circuit-breaker apparatus is mounted inside the mechanism chamber; the several umbrella-skirt bushings are mounted inside the mechanism chamber; the operating mechanism is mounted inside the mechanism chamber, and is arranged at the front end of the circuit-breaker apparatus; the linkage mechanism is arranged above the operating mechanism; the low-voltage cabinet is mounted above the mechanism chamber; and the switch linkage lock is mounted on the linkage mechanism. The problem in the prior art whereby switches of a ring main unit cannot be operated separately, easily resulting in the inability to open cabinet doors or the risk of electric shock when a fault occurs, is solved. The safety factor of the ring main unit is improved, and the universality thereof is increased.

The utility model relates to a grounding wire clamp which comprises a grounding ring and a wire clamp body. One side of the grounding ring is provided with a rod part connected with the wire clamp body, two sides of the grounding ring are fixedly provided with insulating sleeves, and a polished rod used for grounding is reserved between the insulating sleeves. Sliding grooves are formed in the insulating sleeves on the two sides of the polished rod, insulating sliding sleeves are slidably connected into the sliding grooves, springs are installed between the insulating sliding sleeves and the bottoms of the sliding grooves, and the springs have elastic force for pushing the insulating sliding sleeves out of the sliding grooves. The insulating sliding sleeves with the spring mechanisms are arranged on the two sides of the grounding ring, so that the grounding polish rod is effectively protected. When the polish rod is not used, the insulation sliding sleeve automatically slides out to completely wrap the polish rod, the polish rod is prevented from being exposed, the electric shock danger caused by mistaken touch of personnel is avoided, meanwhile, the risk that the polish rod is affected with damp or corroded is reduced, and safety is improved. When grounding operation needs to be carried out, a user can enable the insulation sliding sleeve to retract through simple actions, only a small part of the polished rod used for connection is exposed, the effectiveness of grounding is guaranteed, and the use safety is improved at the same time.

The embodiment of the utility model provides a base assembly and a dish-washing machine, the base assembly comprises a base and a water retaining structure, an inner container has a liquid dropping level where leaked liquid drops, an electric appliance is installed through the base, the water retaining structure is arranged above a base body, the water retaining structure is provided with a water receiving groove, and when the inner container is placed on the base, the water receiving groove is located below the liquid dropping level; leaked liquid flowing out of the liquid dropping level is received through the water receiving groove, the probability that splashed water makes contact with an electric appliance in an electric shock mode can be reduced through the side wall forming the water receiving groove, and therefore the probability of electric shock accidents is reduced.

The invention discloses a PLC-based elevator shaft lighting system and a control method, relates to the technical field of elevator control, and aims to solve the problems of low safety and high wiring complexity of elevator shaft lighting control. The PLC-based elevator shaft lighting system comprises a power line carrier module consisting of an STA controller arranged in a machine room distribution box and a CCO controller arranged in a pit maintenance box; the STA controller and the CCO controller are powered by an emergency power supply, two core wires of the emergency power supply are used as data transmission media, and the STA controller is provided with a power relay for controlling on and off of the well lamp. According to the elevator hoistway lighting system based on the PLC and the control method, starting and stopping of hoistway lighting can be accurately controlled, instant lighting is provided for operators, the wiring and maintenance cost can be reduced, the electric shock risk is eliminated, and the safety of the operators is guaranteed.