326 results about "Weak current" patented technology

The invention provides a rail transit weak current system operation and maintenance management method. The method comprises the following steps: S1, data acquisition and preprocessing; s2, fault probability and residual service life (RUL) prediction based on an LSTM / Transform + attention mechanism; s3, fault propagation analysis and root positioning based on a graph neural network (GNN); and S4, operation and maintenance decision optimization based on reinforcement learning. According to the invention, through fusion of deep learning, a graph neural network and a reinforcement learning algorithm, a full-process and closed-loop rail transit weak current system operation and maintenance management system is constructed.

A power transmission tower grounding resistance intelligent measurement method based on ground potential field distributed sensing comprises the steps that a ground potential sensing network is arranged around a power transmission tower grounding device, and a ground potential field distributed measurement system with an iron tower as the center is established; a broadband characteristic coding current signal is injected into the grounding system through a weak current injection module; acquiring potential response data of each node of the ground potential sensing network excited by the feature coding current signal by adopting a distributed synchronous acquisition technology, and reconstructing complete ground potential field spatial distribution from sparse node observation data based on a compressed sensing theory through a signal reconstruction algorithm; and inputting the reconstructed complete ground potential field spatial distribution map into a pre-trained map neural network model, and outputting an intelligent identification result and an anomaly diagnosis conclusion of the ground resistance. According to the invention, non-contact, distributed and high-precision grounding resistance measurement under the condition that a grounding lead does not need to be disconnected is realized, and the measurement precision and reliability under a complex working condition are remarkably improved.

The utility model discloses an electromagnetic compatibility assessment device, and belongs to the technical field of wireless communication. The equipment comprises a data processing module, a signal generator module, a low-frequency / high-frequency amplifier, a combining unit, a shielding frame and a power supply module, and accurate evaluation of the electromagnetic compatibility of the weak current equipment is realized through modular design. The signal generator module adopts a multi-band vector signal generator to generate configurable interference signals; the low-frequency amplifier and the high-frequency amplifier respectively adopt independent high-precision amplification circuits; and the combining unit couples the two paths of signals into a composite interference signal and outputs the composite interference signal. The shielding frame is made of double-layer aluminum magnesium alloy and is combined with a metal machine frame to form a composite shielding system. And the data processing module regulates and controls parameters in real time through the touch screen, analyzes response data of the tested equipment based on an FFT algorithm, and generates a visual evaluation report.

The invention relates to the technical field of network resource management, and discloses an intelligent building weak current equipment multi-protocol compatible method and system, and a storage medium. The method comprises the steps of collecting multi-protocol network data streams, extracting data packet lengths and arrival interval time as classification features, dividing network data packets into three data packet groups of short and small high frequency, medium stability and large flow, and forming a real-time response network sequence through a priority queue scheduling mechanism and preferentially transmitting the short and small high frequency groups, the method comprises the steps of receiving a real-time response sequence, calculating residual bandwidth to adjust a network buffer area, packaging and splitting a large-flow data packet group to generate transmission sub-blocks, merging the real-time response sequence and the transmission sub-blocks through a merging rule, dividing the merged real-time response sequence and the transmission sub-blocks into a plurality of data stream segments, and distributing a transmission path for each data stream segment. And monitoring bandwidth occupation and transmission delay of each transmission path, and dynamically adjusting path distribution of the data stream segments. According to the invention, the utilization efficiency of network resources and the real-time performance of data transmission in a multi-protocol environment are improved.

The invention provides an alternating-current weak current high-precision detection system and method, and the system comprises a copper-nickel alloy shielding cover which is used for inhibiting space power frequency radiation interference and power system broadband noise, and a magnetic sensitive element which is used for converting the detected magnetic field change into a corresponding initial current signal, the trans-impedance amplifier is used for converting the initial current signal into a voltage signal; the adaptive noise suppression module collects a power frequency fundamental wave reference signal and a harmonic wave reference signal, generates a harmonic wave anti-phase counteracting signal, and performs anti-phase counteracting on real noise of the initial current signal; the analog-to-digital converter is used for converting the voltage signal into a discretized digital signal, and the discretized digital signal comprises a target signal and a random noise signal; and the FPGA coherent demodulation module is used for carrying out cross-correlation operation and narrow-band filtering on the target signal and the random noise signal to separate out a micro-current signal. The technical problems that in the prior art, composite noise covering is limited, the frequency fluctuation adaptability is poor, and microvolt-level signals are difficult to capture are solved.

The invention discloses a machine tool feeding system fault diagnosis method based on multi-level current characteristic distillation. The method comprises the following steps: collecting vibration and current time domain signals and respectively converting the vibration and current time domain signals into two-dimensional time-frequency diagrams; training a source model by using the vibration time-frequency diagram; cloning and freezing a source model, constructing a target model with the same structure, inputting the current time-frequency diagrams into the source model and the target model at the same time, and optimizing the target model through combination of multi-level feature distillation and a multi-target loss function; and finally, fault diagnosis based on the current signal is realized by using the optimized target model. According to the method, source domain data does not need to participate in training, knowledge migration from a vibration mode to a current mode is realized, the problems of weak current signal fault features and scarcity of labeled samples are effectively overcome, and the fault diagnosis precision and cross-working-condition adaptive capacity under the small sample condition are improved.

This invention discloses a harmonic suppression control method for a resonant-cascaded active disturbance rejection permanent magnet linear motor (PMLM) based on a positioning force model, belonging to the field of PMLM control technology. Addressing the problems of incomplete periodic harmonic suppression, poor robustness to unknown disturbances, and insufficient synergy between resonance and active disturbance rejection, this invention embeds the positioning force model into the state-space equation of the active disturbance rejection controller and embeds the resonant controller into the second-stage observation channel of a two-stage extended state observer, constructing a three-layer collaborative architecture of model feedforward compensation, resonant frequency selection suppression, and extended state observer broadband estimation. The positioning force model actively compensates for known harmonic disturbances, the embedded resonant controller accurately suppresses residual periodic components, and the extended state observer compensates for nonlinear and aperiodic disturbances in real time. This invention achieves full-link collaborative suppression of positioning force harmonics, inductor asymmetry harmonics, and unknown disturbances in PMLMs under low-speed, high-speed, and variable-speed conditions, significantly reducing current harmonics and improving system stability and control accuracy. Simulation results show that this control method can achieve high-precision servo control of PMLMs.

The utility model discloses a bridge structure of an indoor weak current engineering comprehensive wiring system, which is characterized in that when a supporting and fixing mechanism is installed, only the installation positions of suspenders need to be roughly determined, and after the two suspenders are installed, the lower ends of the two suspenders and a combination body provided with two hanging frames and a supporting cross beam are connected through connecting pieces. The lifting frame is locked through the first locking piece, the lifting rod does not need to be accurately installed in the process, and the effect of improving the installation efficiency is achieved; in the installation process of the supporting and fixing mechanisms, the situation that the length direction of the installation cross beam is not perpendicular to the length direction of the groove type bridge frame main body occurs, and at the moment, when the groove type bridge frame main body is laid on the multiple supporting and fixing mechanisms, through the positions of a sliding seat, a limiting seat and a second locking piece, the groove type bridge frame main body is fixed; the limiting seats on the sliding seats abut against the two sides of the groove type bridge frame body for supporting and limiting, the sliding seats are fixed through the second locking pieces, and the effect of improving the fixing effect on the groove type bridge frame body is achieved.

The utility model relates to the field of weak current engineering line protection, in particular to a weak current engineering line protection device which comprises a bottom table and a protection shell, through holes are symmetrically formed in the left side and the right side of the upper end face of the bottom table, n-shaped seats are installed in the through holes in a sliding fit mode, and adjusting screw rods are installed at the bottoms in the n-shaped seats. A plurality of first sliding blocks are installed at the bottom in the n-shaped base in a sliding fit mode, protective shells are installed at the bottoms of the first sliding blocks, a right groove is formed in the right side end face in the n-shaped base, a first lead screw is installed at the bottom in the right groove, a second sliding block is installed on the upper end face of the first lead screw, and a pressing plate is installed on the left side end face of the second sliding block. According to the utility model, the adjusting screw rod and the first sliding block structure are adopted, so that the vertical height and the left-right position of the protection shell can be adjusted, weak current lines of different specifications can be protected conveniently, and the use convenience of the device is improved.

The utility model provides a kind of wireless power supply device, including rear mounting assembly, including rear shell, and first conductive structure being arranged in rear shell, it includes first PCB board, first insulating part and first coil arranged in sequence, wherein, first PCB board is located at rear shell bottom wall and contact with it, wiring component is further provided on rear shell, one end of wiring component is connected with first PCB board, and the other end of wiring component is communicated with power supply;Front mounting assembly, including front shell, front shell is detachably connected with rear shell, second conductive structure is provided in front shell, and second conductive structure includes second PCB board, second insulating part and second coil arranged in sequence, wherein, second PCB board is located at front shell bottom wall and contact with it;Solved the installation difficulty, contact problem and easy damage problem of existing technology when 4 inch central control screen is connected with power supply between strong current and weak current module using pin row seat or FPC soft cable.

The utility model provides an integrated heating control system of a vulcanizing machine, and relates to the technical field of vulcanizing machines, the vulcanizing machine comprises a heating module used for heating a vulcanizing medium, and the heating module comprises a circuit board; a control module; the weak current master control module is arranged on the circuit board, and the input end of the weak current master control module is connected with the output end of the control module; the strong current controlled module is arranged on the circuit board, the input end of the strong current controlled module is electrically connected with the output end of the weak current master control module, the output end of the strong current controlled module is connected with the heating module, and the strong current controlled module is used for controlling the heating module to heat the vulcanizing medium according to an output signal of the weak current master control module; wherein the weak current master control module is configured to control the strong current controlled module according to a control signal output by the control module. The weak current master control module and the strong current controlled module are integrated on the circuit board, so that the circuit is simplified, and the space occupied by the heating control circuit in the vulcanizing machine electric cabinet is saved.

The application provides an evaporator support assembly and an air conditioner, and relates to the technical field of air conditioners, and is designed to solve the problem of unreasonable cable arrangement. The evaporator support assembly comprises a connecting support and a temperature control probe, the connecting support is provided with an air inlet configured to allow airflow passing through the evaporator to enter, and the temperature control probe is installed on the connecting support and located at the left side of the air inlet of the connecting support in the air inlet direction. The evaporator support assembly provided by the application can reduce electromagnetic interference between strong current and weak current, reduce the length of the cable, save the manufacturing cost of the air conditioner, save the wire slot required by the cable between the temperature control probe and the electric control box, and reduce the damage to the structural strength of the evaporator support assembly. In addition, the wind speed can be measured faster, so as to improve the measurement accuracy.

The utility model relates to cable laying technical field, and disclose a weak current engineering cable pay-off mechanism, including mobile frame, the upper surface of mobile frame is provided with bracing frame and fixed frame respectively, and the surface of bracing frame is provided with winding roller, the surface of fixed frame is provided with guide pipe, and the inner chamber of guide pipe has reserved the cavity that cable passes through. The utility model, when needing to pay off cable, first motor is used to drive driving roll rotation, and the clamping drive effect of driving roll and supporting roll can drive cable to slide in the inside guide pipe, realize the purpose of paying off cable, and when paying off, can control electric push rod telescopic drive rack movement according to external environment, based on rack and pinion engagement, can drive the deflection of axle rod, adjust the angle of guide pipe, thereby can adjust the height of cable paying off according to external environment, facilitate to avoid external object, reduce the attrition between cable and external article in the process of paying off.

The application discloses a kind of fast matching method and system of multi-channel weak current test gain consistency, it is related to electronic component testing technical field.The matching method includes traceability calibration stage, utilizes internal integrated programmable precision current source to carry out multi-range gear fine calibration to a specified channel, establishes gold channel as precision reference;Fast matching stage, a stable reference current is injected into all test channels by high-speed polling through switch matrix, and the response value of gold channel is used as reference, the consistency proportion coefficient of each channel is calculated;Correction application stage, in actual measurement, the original data of each channel is multiplied by its exclusive proportion coefficient, and the high consistency result after correction is output.The matching system includes the hardware and control program of executing the above matching method.The application is used to realize the unity of precision and multi-channel consistency, calibration process is fully automatic, fast, shorten whole system calibration time, improve instrument production efficiency and factory quality.

The utility model relates to a temperature controller that meets safety regulations, comprising an upper connector and a lower connector that are coupled to each other, the upper connector comprising a ground wire outlet pole, a live wire outlet pole, a zero wire outlet pole, and signal outlet poles one and two for outletting weak current, and further comprising water level detection probes one and two and a temperature sensing probe, the water level detection probe two being electrically connected to the signal outlet pole two, one lead-out end of the water level detection probe one and the temperature sensing probe being electrically connected in common to the signal outlet pole one, and the other lead-out end of the temperature sensing probe being electrically connected in common to the ground wire outlet pole; the temperature sensing probe in the temperature controller has its output end borrowed from the ground wire outlet pole, and its input end is connected in common to one pole with the water level detection probe one, ensuring that the low water level detection circuit is completely separated from the ground wire, improving the safety of the electric heating equipment, and meeting the safety regulations.

The utility model relates to the technical field of weak current engineering, and discloses a weak current engineering bridge structure which comprises a lower bridge and an upper bridge, two ends of a top plate of the upper bridge are respectively provided with a take-up assembly in a penetrating manner, the take-up assembly comprises a rotating shaft and two groups of reels, the rotating shaft rotatably penetrates through the top plate of the upper bridge, and the upper end and the lower end of the rotating shaft are respectively provided with a rotating disc and a connecting plate. The two groups of reels are rotatably mounted on the lower side of the connecting plate respectively, a vertical mounting plate is mounted on the lower side of the connecting plate and located between the two groups of reels, multiple groups of wire harness positioning grooves are formed in the two sides of the vertical mounting plate respectively, and multiple groups of wire harness positioning plates are arranged at the bottom of the lower bridge frame. Compared with the prior art, the cable tray has the advantages that wire harnesses with different lengths are classified and positioned in the cable tray, wire harnesses with conventional lengths are positioned through the wire harness positioning plate, lengthy wire harnesses are positioned through the wire harness positioning groove, and the lengthy wire harnesses are wound by rotating the take-up assembly, so that the wire harnesses are neatly stored in the cable tray.

The utility model relates to the weak current engineering construction technical field, and disclose a kind of cable unwinding device for weak current engineering construction, including movable frame, the movable frame right side fixedly connected with handle, movable frame inside rotationally connected with pay-off roller, the pay-off roller front fixedly connected with plugboard, the movable frame front is provided with rotating mechanism, the rotating mechanism front is provided with auxiliary mechanism, the rotating mechanism includes fixed frame, the fixed frame is fixedly connected in movable frame front, the fixed frame front fixedly connected with drive motor, the drive motor back end fixedly connected with pivot, the pivot back end fixedly connected with rotating frame, the rotating frame inside slidingly connected with slide plate, the movable frame inside rotationally connected with linkage frame. Drive motor is rotated by pivot and drives rotating frame, and the transmission of the combination slide plate, linkage frame and other components can drive pay-off roller to rotate in opposite direction, so that pay-off roller can automatically take up wire.

This invention relates to the field of data center power substation technology, and discloses an integrated layout method and system for low-voltage systems in data center power substations. The system includes a power substation, an in-building low-voltage room, and an access switch. The power substation contains low-voltage cabinets, low-voltage boxes, and low-voltage junction boxes with low-voltage terminal blocks, as well as prefabricated low-voltage cable trays, which together serve as the installation and cable connection carriers for low-voltage equipment. The in-building low-voltage room contains an aggregation switch. By configuring low-voltage cabinets, low-voltage boxes, or junction boxes with terminal blocks within the power substation, the system provides two deployment options for the access switch: either within the substation or in the in-building low-voltage room. Furthermore, key equipment and low-voltage cable trays are prefabricated in the factory, requiring only fiber optic or cable connections on-site, ultimately achieving the effects of shortening the delivery cycle, improving communication stability, and reducing maintenance difficulty.

The present application belongs to the technical field of fluid machinery electronic control, and relates to a pilot type electronic unloading valve, which adopts a layout form of non-contact high-pressure gas for main electronic components, effectively improves the working reliability of the electronic unloading valve, adopts an external quick plug assembly overall design type, effectively achieves quick and flexible installation, and reduces the production cost and the later operation and maintenance cost, adopts an advanced pilot type unloading mode, and realizes the high working reliability and long service life of the electronic unloading valve in principle. Only a weak current or even no current is needed, and only a weak elastic return spring is needed, so that the main unloading pipeline can be long-term normally closed, that is, the unloading valve is weak current normally closed, thereby, the low load design principle can be used to handle mechanical parts and electronic components, so that the working reliability of the unloading valve can be improved. The present application also installs the electronic unloading valve on the compressor system, effectively guarantees the working reliability of the compressor system, and can reduce the production cost.

The utility model discloses a protective device for a weak current engineering line pipe, which belongs to the technical field of line pipe protection and comprises a lower protective ring and an upper protective ring, the lower protective ring and the upper protective ring are respectively connected with a lower positioning ring and an upper positioning ring, and a plurality of adjusting components are arranged between the lower positioning ring and the upper positioning ring and between the lower protective ring and the upper protective ring. The adjusting assembly comprises a telescopic rod and a first spring, and a plurality of inserting blocks are fixedly connected to the lower protection ring. Through cooperative use of the devices, the positions of a lower positioning ring and an upper positioning ring are adjusted, the lower positioning ring and the upper positioning ring abut against the side wall of a cable under pushing of a first spring, the cable is prevented from shaking and beating a lower protection ring and an upper protection ring, an insertion block is limited through an arranged limiting mechanism, and the insertion block is prevented from being damaged. And the lower protection ring and the upper protection ring are fixed, so that the insertion block is prevented from moving out of the insertion hole under the action of external force, and the connection stability of the lower protection ring and the upper protection ring is improved.

The invention provides an FTTR service delivery quality control method and apparatus, an electronic device and a medium. The method comprises the steps of receiving a main optical modem installation scene image uploaded by a smart engineer; the main optical modem installation scene image is input into the trained AI intelligent quality inspection model, if the trained AI intelligent quality inspection model identifies that the main optical modem installation scene image has no copying features and no weak current box features and contains a main optical modem, it is judged that the main optical modem installation scene is compliant, and otherwise, it is judged that the main optical modem installation scene is not compliant; in response to the fact that the main optical modem installation scene is not compliant, a first interception instruction is automatically triggered, and a first rectification guide is pushed; by comparing the actual deployment number of the slave optical modems in the installation verification system with the order number of the slave optical modems in the front-end acceptance system and judging whether a supply source is compliant or not, the compliance of access of the slave optical modems is verified. According to the embodiment of the invention, the standardized and intelligent management and control of the FTTR service delivery quality can be realized.

The utility model provides a magnetic ring fixing device, an electric appliance box and an air conditioner. The magnet ring fixing device comprises a base; the clamping structure is arranged on the base, and a clamping space used for fixing a magnetic ring is defined by the clamping structure and the base together. According to the magnetic ring fixing device, the electric appliance box and the air conditioner provided by the utility model, the first clamping structure is arranged on the base, so that the base can be disassembled and assembled on the preset structure, the base can be assembled when needed and disassembled when not needed, and the space utilization rate of the electric appliance box is improved. Meanwhile, the second clamping structure is matched with the third clamping structure of the other magnetic ring fixing device in a clamping mode, stacking of the two magnetic ring fixing devices is achieved, the number of fixed magnetic rings can be increased, wires of the strong current and wires of the weak current can be separated according to the layout of the strong current and the weak current, and mutual interference of the strong current and the weak current is prevented.

The utility model discloses a line maintenance auxiliary device with a height adjusting structure for a weak current well, which relates to the technical field of weak current well line maintenance auxiliary equipment, and adopts the technical scheme that the line maintenance auxiliary device comprises a supporting base, the upper surface of the supporting base is provided with symmetrically-arranged first containing grooves and a plurality of second containing grooves formed between the two first containing grooves, the inner walls of the first containing grooves are movably connected with supporting shafts, the outer walls of the supporting shafts are fixedly connected with first supporting columns, and a first transverse rod is fixedly connected between the outer walls of the two first supporting columns. A guide block is fixedly connected to one side of the first supporting column. The inner wall of the guide block is movably connected with a second cross rod, and the two ends of the second cross rod are fixedly connected with second supporting columns. The beneficial effects of the utility model are that the overall height of the device is adjusted, thereby facilitating the maintenance of lines with different heights, avoiding the inconvenience of carrying caused by too high height, and improving the convenience of carrying and transportation.

The invention discloses a weak current equipment intelligent operation and maintenance management system fused with the Internet of Things, and belongs to the technical field of weak current equipment operation and maintenance. The system comprises a data acquisition module, a data preprocessing module, a health degree dimension division module, a risk prediction module, a fault analysis module and a visual early warning module. The method comprises the following steps: acquiring health parameters, operation parameters and a topological relation connection diagram of weak current equipment through an Internet of Things sensor, performing cleaning, standardization and feature processing on the health parameters and the operation parameters to generate equipment state feature data, evaluating the health degree based on the equipment state feature data, and dividing the health degree into a health state dimension and an unhealth state dimension; according to the health state dimension and the non-health state dimension, differentiated risk prediction is carried out on the weak current equipment by adopting one of an ARIMA model and an LSTM model, a fault root cause is positioned by combining a topological relation connection diagram and a related model, and a result is visually presented and early warning information is pushed. Intelligent and precise operation and maintenance of the weak current equipment are realized, the operation and maintenance efficiency is improved, and the fault risk is avoided in time.

The utility model relates to the technical field of modular buildings, in particular to an indoor strong and weak current unit integration module of a modular building, which is correspondingly connected with a ceiling, a floor and a wall surface and comprises a mounting plate and an electromechanical integration module, the mounting plate is connected with a ceiling; a pipeline is laid in the ceiling; the electromechanical integration module comprises a decorative plate, a shell, a connection conversion box and a strong and weak electricity box module; the shell is correspondingly connected with a ceiling, a floor and a wall surface; the connection conversion box and the strong and weak electricity box module are correspondingly mounted at the top end and inside the shell; the top end of the connection conversion box is connected with the mounting plate; the decorative plate is detachably connected with the shell, and the shell is isolated from an indoor space by the decorative plate; the pipeline penetrates through the mounting plate and then is connected to the connection conversion box, and the connection conversion box is correspondingly and electrically connected to the strong and weak electricity box module. And by adopting industrial design, the indoor strong and weak current unit and decoration engineering are integrated into a factory for industrial production, so that the assembly quality and efficiency are improved.

The utility model belongs to the technical field of electronics, and particularly relates to a low-harmonic rectification control circuit which remarkably counteracts low-order harmonics such as five-order harmonics and seven-order harmonics through multi-phase superposition of a phase-shifting transformer, the total harmonic distortion (THD) is lower than 5%, the environmental protection requirement of high-power industrial equipment for a power grid is met, and a control cable has the advantages of low harmonic pollution, low cost and the like. The DSP main control chip is combined with the digital timer, and the serial-to-parallel circuit only needs one PWM pin and three GPIO pins, so that the DSP resource occupation is reduced; the gating circuit adopts a general multiplexer (74HC4051D), so that the hardware complexity is reduced; the drive circuit realizes strong and weak current isolation through the isolation transformer, prevents high-voltage interference from damaging a control chip, improves the system safety, and reduces the maintenance cost of the circuit.

The application discloses a threading machine for weak current engineering, and relates to the technical field of threading machines, which comprises a base, the surface of the base is provided with a driving motor, the output end of the driving motor is fixedly connected with a rotating shell, the side, away from the output end of the driving motor, of the rotating shell is fixedly connected with connecting rods arranged in a circle and equidistantly, one end, away from the rotating shell, of the connecting rods is fixedly connected with a threading disc, the surface of the threading disc is slidably connected with adjusting blocks arranged in a circle and equidistantly, the inside of the adjusting blocks is fixedly installed with dies, the surface of the rotating shell is fixedly connected with a connecting pipe which is in communication with the rotating shell, the end, away from the rotating shell, of the connecting pipe is fixedly connected with a first fixing ring and a first fixing ring, and the outside of the connecting pipe is provided with inner supporting plates arranged in a circle and equidistantly. The application can support the inner wall of the pipe to be threaded, so that the pipe is prevented from being crushed when the device threads the pipe.

Embodiments of the present invention related to a neuromimetic circuit including a transmitter circuit to receive the threshold signal from a superconducting optoelectronic neuron and convert the small current pulse to a voltage pulse sufficient to produce light from a semiconductor diode. This light is the signal used to communicate between neurons in the network. The transmitter circuit in accordance with the present invention includes an amplifier chain that comprises two Josephson junctions, a superconducting thin-film current-gated current amplifier, and a superconducting thin-film current-gated voltage amplifier. The transmitter circuit in accordance with the present invention enable an amplification sequence that allows neuronal firing of about 20 MHz with power density sufficiently low to be cooled with standard 4He cryogenic systems operating at 4.2 K.

The invention belongs to the electrical technical field, and especially relates to a weak current box comprising a box body, the box body is rotatably connected with a covering door A and a covering door B, the covering door A is fixedly connected with a fixed block, the fixed block is slidably connected with an insertion rod, the insertion rod and the fixed block are both provided with round holes, the covering door B is fixedly connected with an insertion port, the insertion rod can be inserted into the insertion port, and the insertion port is fixedly connected with the fixed block. A moving part is slidably connected to the covering door A, a locking rod is fixedly connected to the moving part, a fracture is formed between the locking rod and the moving part, a buzzer is arranged on the covering door A, and lock holes are formed in the covering door A and the box body. A sliding column fixedly connected to the covering door A is further included, a sensing part is slidably connected to the sliding column, and a plurality of arc protrusions are arranged on the moving part. According to the weak current box provided by the utility model, when accidents such as forgetting to carry a key or losing the key occur, a worker can still conveniently and normally complete operation and maintenance work.