1156 results about "Weak current" patented technology

The invention relates to the technical field of power operation and maintenance, in particular to a power system operation and maintenance method and system of an intelligent power distribution cabinet for weak current control. The method comprises the following steps: acquiring power operation data and sensing data of a power distribution cabinet, and analyzing a topological structure of a power system to obtain a dynamic topological structure of the power system; performing potential load anomaly analysis on the sensing data of the power distribution cabinet to obtain load anomaly node data of the power system; performing load anomaly influence structure division based on the load anomaly node data of the power system to obtain load anomaly influence nodes; performing abnormal node classification on the load abnormal influence nodes according to the sensing data of the power distribution cabinet to obtain three-phase power load offset nodes and three-phase power improper wiring nodes; and performing power distribution reconstruction on the three-phase power load offset node and the three-phase power improper wiring node to obtain abnormal node power distribution data. According to the invention, the weak current control efficiency and the power distribution energy efficiency can be improved.

The invention relates to a weak current equipment abnormity judgment method and system based on the Internet of Things. The method comprises the steps that multi-dimensional parameters such as temperature, current, voltage and vibration frequency are collected through nodes of the Internet of Things, and a dynamic tracking identifier is generated; performing dynamic parameter association analysis on edge nodes, and establishing a real-time coupling degree relationship between parameters; according to the analysis result, evaluating the abnormity level in a grading manner, and distinguishing the primary abnormity of single parameter deviation and the advanced abnormity of multi-parameter collaborative deviation; the cloud platform starts a differential verification mechanism for different levels of anomalies, primary anomalies are transversely compared, and advanced anomalies execute full-life-cycle backtracking verification; the system comprises a data acquisition module, an edge calculation module, an analysis and evaluation module and a cloud analysis platform, and can realize the method. According to the invention, through dynamic coupling degree analysis and a hierarchical verification mechanism, the abnormality judgment accuracy is remarkably improved, and false alarms caused by environmental interference are effectively reduced.

The invention relates to the technical field of weak current intelligent terminal control, in particular to a hierarchical response management control system for a weak current intelligent terminal. The system comprises a state sensing module, a prediction optimization module, a task scheduling module, a fusing control module and an execution feedback module. The state sensing module collects a power supply state, task information and environmental parameters, and constructs a multi-dimensional operation scene model; the prediction optimization module adopts an exponential weighted moving average algorithm to predict a task peak value, and judges a key event probability through an index mutation rule; the task scheduling module generates a hierarchical response sequence and a power supply strategy based on a reinforcement learning algorithm; the fusing control module executes task delay, edge autonomy and key task guarantee mechanisms when resources are abnormal or communication is interrupted; and the execution feedback module collects an operation result and updates the model to realize scheduling closed-loop optimization. According to the invention, the response efficiency and operation toughness of the weak current system in a complex scene are improved.

The invention relates to a weak current cable fault positioning method and system, and the method comprises the steps: preliminarily locking a fault region through monitoring the axial stress change in real time, injecting a low-frequency pulse signal in a target section, analyzing the reflection waveform characteristics, and extracting the waveform distortion characteristics in a reflection signal; dynamically adjusting the output impedance based on the amplitude attenuation and time delay relationship, and if the dynamically adjusted output impedance cannot enable the output impedance of the injected low-frequency pulse signal to be synchronous with the impedance change trend of the cable, marking as an impedance mismatch point; after an impedance mismatch point is identified, other interferences are eliminated through multi-band signal attenuation difference analysis, and the position of a fault point is determined; the system is used for implementing the method. According to the method and system, stress monitoring and electric signal detection are combined, the detection range is remarkably shortened, the positioning precision and the detection accuracy are improved, and the method and system are suitable for weak current cable fault diagnosis in a complex environment.

The utility model relates to the technical field of control cabinets, discloses a weak current intelligent control cabinet with a heat dissipation structure, and solves the problems that only a fan is used in the prior art, the heat dissipation effect is poor, and a dustproof net is inconvenient to overhaul. A weak current intelligent control cabinet with a heat dissipation structure comprises a device body, a cabinet door is hinged to the device body, dust screens are arranged in the middle of the top end of the device body and on the side walls of the left end and the right end of the device body, heat dissipation holes are formed under the dust screens, and a mounting frame used for mounting electrical components is fixedly connected into the device body. According to the weak current intelligent control cabinet with the heat dissipation structure, it can be ensured that the temperature in the control cabinet is always kept within a proper range, performance reduction or damage, caused by overheating, of electric appliance elements is avoided, the operation stability of the electric appliance elements is improved, and the service life of the electric appliance elements is prolonged. And meanwhile, the dustproof net is convenient to clean and maintain, and the flexibility of equipment is improved.

A first wiring pipe and a second wiring pipe are detachably connected in a splicing mode, the inner side of the end face of the first wiring pipe is provided with an extrusion conical groove, and the end face of the second wiring pipe is provided with a rubber embedding and sealing block in a bonding mode at the position corresponding to the extrusion conical groove. According to the utility model, the end sleeves, the built-in annular air bags, the air injection pipes and the rubber sealing rings are arranged at the end parts of the first wiring pipe and the second wiring pipe, so that the built-in annular air bags can be conveniently injected with air after weak current line connection, and the built-in annular air bags are deformed after air injection; therefore, the rubber sealing ring on the inner side is driven to tightly abut against the outer side of the weak current circuit, so that the weak current circuit and the end parts of the first wiring pipe and the second wiring pipe are sealed, and the weak current wiring joints in the first wiring pipe and the second wiring pipe are protected. And external impurities are prevented from entering to influence the connection and use of the weak current line.

The invention discloses a weak current monitoring system and method based on intelligent Internet of Things, and relates to the technical field of weak current monitoring, and the system comprises a real-time data monitoring unit, an equipment recognition unit, a fault detection unit, a fault positioning unit and an early warning prompt unit. According to the invention, the real-time data monitoring unit collects data in the weak current equipment and the area where the weak current equipment is located, so that an operator can timely obtain a series of data of a specified area to monitor changes in the area in real time, and the equipment identification unit analyzes all collected infrared image data to obtain the type of the equipment, so that the accuracy of the equipment identification is improved. In combination with a specific area corresponding to image data, related information of the equipment can be further analyzed, and meanwhile, a fault detection unit is utilized to judge a fault state corresponding to each type of equipment when abnormity is found, so that maintenance personnel can take measures in time for intervention, and the maintenance efficiency is improved. And an abnormal area can be marked in the whole image data through the fault positioning unit, so that the specific position of the equipment abnormity can be conveniently locked.

The invention provides a weak current acquisition circuit and electronic equipment, which are applied to the field of control or regulation systems, and the circuit converts an input current signal to be processed into a corresponding first voltage signal through a first analog switch, a second analog switch and sampling resistors corresponding to different gear control signals; the operation integration unit is used for amplifying the first voltage signal and generating an integration voltage signal, and then the analog-to-digital conversion unit is used for converting the integration voltage signal into a digital voltage signal; a control unit collects the digital voltage signal and calculates a target current value corresponding to the current signal to be processed according to the digital voltage signal. The circuit provided by the embodiment of the invention can be used for amplifying the current signal to be processed, carrying out analog-to-digital conversion on the integral voltage signal and acquiring the corresponding digital voltage signal according to the preset digital filtering algorithm, and can effectively reduce the influence of noise on the acquisition precision in the weak current acquisition process.

The invention discloses an intelligent control system and method for weak current equipment based on the Internet of Things, and relates to the technical field of weak current equipment control. Intelligent selection and switching of a main path are realized through topology modeling, path scoring, health feature analysis and supervised learning training and construction of a path health scoring function; the system can continuously monitor node states, identify abnormal nodes and carry out dynamic path replacement, and control continuity is guaranteed; and if path switching fails, fault root causes are automatically traced, high-risk nodes are isolated, and an operation and maintenance platform is linked to intervene in processing, so that the adaptivity, the self-healing capability and the engineering operation and maintenance efficiency of the weak current control system are remarkably improved.

The invention relates to a weak current acquisition device, belongs to the technical field of weak signal detection, and solves the problems that in the prior art, signal processing frequency is insufficient, a circuit structure is complex and difficult to design and debug, and high sampling rate and sensitivity cannot be considered at the same time. The weak current acquisition device comprises an acquisition module, a primary amplification module, a secondary amplification module and a feedback network, wherein the acquisition module is used for acquiring a weak current signal and sending the weak current signal to the primary amplification module; the primary amplification module is used for primarily amplifying the collected current signal and then sending the current signal to the secondary amplification module; the secondary amplification module further amplifies the current signal and then sends the current signal to the signal processing terminal; the two ends of the feedback network are connected with the input end and the output end of the second-stage amplification module respectively, and the feedback network is used for adjusting the gain of the second-stage amplification module.

The invention relates to an economical direct-current circuit breaker with zero-region rapid recovery capability and a control method. The circuit breaker solid state topology comprises a main through-flow branch, a resonance commutation loop, a damping energy consumption loop, a capacitor reset loop, a weak current breaking loop, a pre-charging branch and an MOV energy release module. When it is judged that the system has a short-circuit fault, fault current is introduced into a resonance commutation loop and a damping energy consumption loop, the short-circuit fault is rapidly removed, and safe opening time is provided for a vacuum switch of a main through-flow branch; if special conditions such as manual system maintenance are judged, a weak current on-off loop is put into use; a capacitor of a resonant circuit does not need to be externally provided with a charging circuit, a main through-flow branch adopts a vacuum switch to replace a power electronic device, a fault processing module adopts a half-control device, and the economic performance of the whole machine is excellent; the capacitor reset loop recovers the preset voltage of the capacitor, and the secondary breaking capacity of the circuit breaker is ensured under the medium-high voltage working condition. The device has good use value and economic benefit in the field of direct current power transmission and distribution and the like.

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.

The utility model discloses an electric control device and an air conditioner, and relates to the technical field of air conditioners, the air conditioner comprises a function load module, the function load module comprises a first end face and a second end face; the electric control device comprises a strong current control panel and a weak current control panel, and the weak current control panel is electrically connected with the strong current control panel; the strong current control board is arranged corresponding to the first end face, and the weak current control board is arranged corresponding to the second end face. Thus, the electric control device is arranged to be the strong current control panel and the weak current control panel, and the strong current control panel and the weak current control panel correspond to the first end face and the second end face of the function load module respectively, the integrated design of the electric control device and the function load module is achieved, the space inside the air conditioner is effectively saved, and therefore the size of the air conditioner is reduced.

The invention relates to a real-time data encryption transmission method and a real-time data encryption transmission device for a weak current remote monitoring system, in particular to the field of weak current remote monitoring systems, and effectively avoids the problem of update failure caused by link fluctuation in a dynamic network environment by intelligently predicting a stable state of a network to accurately trigger key update. A lightweight distributed consensus mechanism is adopted to generate a security key block, so that the communication overhead is remarkably reduced while the Byzantine fault-tolerant capability is guaranteed; a precise distribution strategy based on topological difference identification greatly reduces redundant transmission, and efficient delivery of keys is realized; the innovative chain verification and zero knowledge synchronization mechanism ensures that the offline node safely recovers the key state, and the overall scheme significantly optimizes the transmission efficiency and the resource utilization rate while improving the system security, and is especially suitable for large-scale and high-dynamic Internet of Things monitoring scenes.

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 invention relates to the technical field of weak current engineering, and discloses a high-safety weak current engineering voltage transformation power supply device which comprises a voltage transformation box body, an upper independent space and a lower independent space are formed through a designed top plate and a designed bottom plate, a transformer body and an oil conservator are effectively isolated, the risks of oil leakage and fire disasters are reduced, the safety of the whole device is improved, and the safety of the whole device is improved. A conveying pipe, a liquid outlet pipe and a concentration pipe are designed to form a closed insulating oil circulation system, the conveying pipe is responsible for enabling insulating oil conveyed to the top space of the transformer from an oil conservator to submerge a transformer body from bottom to top, and the liquid outlet pipe guides the oil to the concentration pipe from the top of the transformer. The circulating flow ensures the uniform distribution of oil in the transformer and is beneficial to maintaining constant temperature, so that the cooling efficiency is improved, the transformer can be prevented from being overheated through effective cooling, and the service life of the transformer is prolonged.

The embodiment of the invention provides a gallium nitride totem-pole circuit and a control evaluation system of the gallium nitride totem-pole circuit, and the circuit comprises a gallium nitride power device which comprises an integrated semiconductor tube and an integrated drive circuit; the isolation chip is connected between the control module and an integrated driving circuit of the gallium nitride power device and is used for sending the pulse width modulation signal sent by the control module to the integrated driving circuit, and the isolation chip can ensure the electrical safety of weak current and strong current; the gallium nitride power device is used for controlling the on-off state of the integrated semiconductor tube through the integrated driving circuit according to the pulse width modulation signal sent by the isolation chip; under the condition that the integrated semiconductor tube is conducted, the voltage is output to the control module based on the bus voltage through the integrated semiconductor tube, and the driving circuit is integrated on the gallium nitride power device, so that the circuit design can be simplified, overcurrent protection and undervoltage protection are simultaneously carried out, and the safety of the gallium nitride totem pole circuit is improved.

The invention provides a broadband weak current sensing method and system for distribution network voltage inversion. The system comprises a tunneling reluctance magnetic core, a feedback coil, an open magnetic ring, a sampling resistor and a feedback conditioning circuit. One side, close to the feedback conditioning circuit, of the open magnetic ring is provided with an opening; the number of the tunneling magnetic resistance magnetic cores is two, and the two tunneling magnetic resistance magnetic cores are symmetrically arranged with the center of the opening of the opening magnetic ring as the symmetry point and used for obtaining two current data with opposite sensitivity directions. The two tunneling magnetic resistance magnetic cores are connected with one end of the feedback conditioning circuit, and the other end of the feedback conditioning circuit is sequentially connected with the feedback coil and the sampling resistor; according to the invention, two pieces of tunneling magnetic resistance magnetic cores are symmetrically arranged in the current sensor, so that feedback current data with opposite sensitivity directions are obtained, high-precision induction current output data are obtained after offset voltage and temperature drift correction, and high-precision data support can be provided for subsequent voltage inversion and related work.

The invention relates to the technical field of intelligent industry, and discloses a visual communication system based on weak current engineering and an operation method thereof, and the system comprises a multi-mode signal collection module, an intelligent data processing module, a dual-channel communication transmission module, an interactive visualization module and an autonomous control system module. The method comprises the following steps: synchronously acquiring video, audio and environmental parameters through a distributed sensor array; eliminating multi-source signal deviation by adopting a space-time alignment algorithm; feature fusion and quality evaluation are realized based on a deep neural network; dynamically selecting a wired and wireless hybrid transmission mode; an AR enhanced visual human-computer interface is constructed; and implementing a fault self-diagnosis and fault-tolerant recovery mechanism. According to the invention, the bit error rate of the communication system is reduced, the continuity and reliability of the communication process are ensured, and the man-machine interaction efficiency and the emergency response speed are improved.

The air conditioner comprises a main body part, a fresh air part and an electric control box, the main body part comprises a heat exchange assembly, a fan assembly and an air guide assembly, and the length direction of the main body part is a first direction; the fresh air component and the body component are arranged in the first direction and located at one end of the body component in the length direction. The electric control box is located between the main body component and the fresh air component in the first direction and comprises a box body and a weak current plate arranged in the box body, and at least part of weak current working components in the main body component and at least part of weak current working components in the fresh air component are electrically connected with the weak current plate. The electric control box is arranged between the main body part and the fresh air part, the main body part, the electric control box and the fresh air part are arranged in the first direction, the electric control box is electrically connected with the main body part and the fresh air part conveniently, the wiring distance between the electric control box and the main body part and the wiring distance between the electric control box and the fresh air part are short, wiring is simple, occupied space is small, and arrangement is convenient; and the miniaturization design of the air conditioner can be realized.

The utility model relates to the technical field of weak current engineering wiring, and discloses a weak current engineering wiring device, which comprises an identification rod, the front surface of the identification rod is provided with scale marks and digital identifications, the outside of the identification rod is provided with a wiring adjusting mechanism, the wiring adjusting mechanism comprises a plurality of limiting arc rings, and the limiting arc rings are provided with a plurality of limiting grooves. And elastic clamping pieces are mounted in the limiting arc-shaped rings. According to the utility model, through the cooperation of the identification rod, the adjusting block, the limiting arc-shaped rings, the arc-shaped stop levers and the elastic clamping pieces, a plurality of cables can be arranged in the limiting arc-shaped rings respectively, and at the moment, the adjusting block is moved, moves on the identification rod and drives the limiting arc-shaped rings and the cables to move, so that the distance between the plurality of cables can be adjusted conveniently; after adjustment, through cooperation of a protection groove, a rotary knob, a screw rod, an adjusting plate, a pressing rod, a limiting rod and a supporting plate, a pressing plate can be conveniently driven to press the upper portion of the marking rod, the stability of an adjusting block and a limiting arc-shaped ring is improved, and subsequent wiring operation is facilitated.

The invention relates to a weak current signal detection system and method based on a fluxgate, and the system comprises an excitation module, a range selection module, a power amplification module, a fluxgate magnetic core coil, a sampling resistor, a differential amplification module and a data processing module which are connected in sequence, the magnetic core current reaches saturation current; the range selection module is used for adjusting the gain of the power amplification module; the power amplification module is used for amplifying the excitation signal; the fluxgate magnetic core coil is used for sensing current to be measured; the sampling resistor is used for sampling saturation current of a magnetic core coil of the fluxgate; the differential amplification module is used for amplifying saturation current of a magnetic core coil of the fluxgate; and the data processing module performs time difference calculation on the amplified saturation current through resampling, and outputs a weak current detection result. Compared with the prior art, the hardware cost can be reduced while the measurement precision is improved.

The invention discloses a wiring device integrating wiring and wire arrangement for weak current, and relates to the technical field of wiring. Comprising a protective shell, a driving device and a line carrying device, the line carrying device comprises a fixing shaft, and a plurality of pairs of fixing plates are fixedly arranged on the outer wall of the fixing shaft. The upper clamping plate is pulled upwards, the upper clamping plate is lifted upwards to drive the torsion spring to deform, one end of an electric wire needing wiring is placed on the surface of the lower bottom plate, the upper clamping plate is pushed to reset to enter the torsion interval of the torsion spring again, the upper clamping plate is reset under the elastic action of the compression spring and the torsion spring to clamp and fix the electric wire, and the edge sealing plate is rotated. The semi-arc surface of the edge sealing plate can support one or more adjusting wheels, the adjusting plate rotates to drive the connecting shaft rod to rotate, the connecting shaft rod rotates to drive the angle of the fixing block to change, the rotatable angle of the corresponding upper clamping plate is reduced, and the adjustable angle of the upper clamping plate which is not supported by the arc surface of the edge sealing plate is reduced. Therefore, the wire carrying device can clamp wires with various thicknesses.

A charging pile calibration device and system with strong and weak current separation, which relates to the technical field of electric vehicle charging pile calibration and testing, comprises a strong and weak current separation charging pile calibration device 1, a cloud platform 2 and a remote control APP 3, characterized in that the strong and weak current separation charging pile calibration device 1 is provided with a strong current chamber, a weak current chamber and a digital signal connector, the strong current chamber realizes the collection and conversion of electric energy parameters for high voltage and strong current into digital signals, and the digital signal communication is realized with the weak current chamber through the digital signal connector. The present invention provides a safer calibration device and system for electric vehicle charging piles, which is used to realize the safe completion of on-site calibration, testing, supervision and spot check of electric vehicle charging piles.

The invention belongs to the field of power equipment monitoring, and discloses a lightning arrester on-line monitoring system and method based on non-contact differential electric field probe self-adaptive compensation, a non-contact differential voltage probe is adopted, the sensitivity to environmental noise and interference to other-phase high-voltage buses is remarkably reduced through differential measurement, and the monitoring accuracy is improved. And the self-adaptive compensation algorithm is combined, so that the measured signal can be corrected in real time according to the on-site electromagnetic environment change, the amplitude and phase distortion can be effectively inhibited, the accuracy and reliability of the high-voltage side bus voltage acquisition can be improved, and the overall monitoring precision can be obviously improved. According to the invention, high-sensitivity and wide-dynamic-range measurement of lightning arrester current is realized by adopting the fluxgate weak current sensor, accurate detection under small signals is guaranteed, and fine analysis of harmonic components is facilitated.

The invention relates to the technical field of nuclear radiation monitoring, and provides a multifunctional signal processing device for nuclear measurement, which comprises three signal conditioning modules respectively used for conditioning signals of three nuclear measurement detectors, the signal processing device comprises a signal processing module and a signal processing module, weak signals output by the signal processing module are shielded by a tri-coaxial cable and a connector and then enter corresponding channels to be amplified, filtered, subjected to gain adjustment and signal conditioning and then subjected to isolated output, the signal processing module further comprises a signal processing module, and the conditioned signals are sampled and counted by a high-speed ADC and a counter to form digital signals. The multifunctional signal processing device for nuclear measurement is used for processing output signals of various detectors of a nuclear measurement system, can carry out digital processing on weak pulse signals, weak current signals and stacked and overlapped charge pulses, and is simple and efficient.

The invention relates to the field of weak current cables, in particular to an anti-interference weak current cable for an airport, which comprises a cable main body used for transmitting various data information; the data acquisition module is used for acquiring a temperature reference value, a smoke particle concentration value and a longitudinal ventilation rate; the period monitoring module is used for determining whether to adjust the duration of the data acquisition period according to whether the suspected abnormal point location exists in the target monitoring area, and setting a period adjustment set according to the temperature difference value; the positioning analysis module is used for determining whether to perform positioning analysis on each abnormal point location according to the number and the distribution state of the abnormal point locations in the target monitoring area, and determining a positioning strategy according to the proportion of the smoke discharge point locations; the information transmission module is used for transmitting cable information to a user, and the requirement for the coverage degree of monitoring equipment is lowered under the condition that the accuracy of a fire source positioning result is guaranteed.

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 utility model relates to the technical field of weak current laying construction, and discloses an auxiliary wiring device for weak current laying construction, which comprises a box body, the two sides in the box body are fixedly connected with sliding chute plates, the sliding chute plates are internally connected with push-pull plates in a sliding manner, the push-pull plates are internally provided with uniformly distributed wire bunching holes, and the wire bunching holes are connected with the sliding chute plates in a sliding manner. A bunching hole is formed in the box body, an adjusting assembly is arranged in the bunching hole, limiting holes are formed in the two sides of the push-pull plate, dismounting assemblies are arranged on the two sides of the box body, limiting columns are connected to the opposite sides of the two dismounting assemblies, two protective shells are fixedly connected to the two sides of the upper portion of the inner wall of the box body, and open grooves are formed in the outward sides of the protective shells. According to the push-and-pull device, the clamping block, the first spring, the fixed shell, the telescopic groove, the pull rod, the limiting column, the limiting hole, the rotating plate, the rotating shaft and the second spring work in a matched mode, the push-and-pull plate can be disassembled and assembled through the disassembling assembly, and replacement and overhauling are convenient.

The utility model discloses a weak current cable installation pipe group, which comprises a first chuck, a plurality of pipelines penetrate through the middle part of the first chuck, one end of each pipeline far away from the first chuck is sleeved with a second chuck, the outer wall of each pipeline is movably sleeved with a sliding disc, and the outer wall of each sliding disc is fixedly connected with a limiting ring. The outer wall of the limiting ring is movably sleeved with a rotating ring, the top end of the rotating ring is fixedly connected with a fixing support, a pull wire is arranged in the pipeline, one end of the pull wire is fixedly connected with a threaded rod, one end of the threaded rod is fixedly connected with a circular plate, and the outer wall of the threaded rod is movably sleeved with an inner threaded cylinder in a threaded mode. According to the utility model, by arranging a series of structures, the space limitation on the fixed installation of the pipeline can be effectively reduced, so that the quick installation and fixation of the pipe group are facilitated, different weak cables are prevented from penetrating into different pipelines in sequence, and the time required for the weak current cables to penetrate through the pipe group is shortened.