1210 results about "Transmission cable" patented technology

The invention discloses an explosive environment airtight medium-voltage power transmission cable, and relates to the technical field of power cables, the explosive environment airtight medium-voltage power transmission cable comprises a central conductor, the outer side of the central conductor is tightly coated with an internal conductor insulator, and the outer side of the internal conductor insulator is tightly coated with an insulated conductor shield; the outer sides of the multiple insulated conductor shields are jointly coated with a steel tape armoring, the outer side of the steel tape armoring is tightly coated with a PVC protection sleeve, and the outer side of the PVC protection sleeve is provided with an external telescopic expansion protection mechanism. A fireproof barrier is constructed on the outer side of the cable through the flame-retardant metal thin net, it is ensured that combustible gas outside the cable cannot be ignited even if open fire appears in the cable, the overall fireproof and explosion-proof performance of the cable is further effectively improved, and meanwhile the outer diameter of a fault position is actively increased, so that the service life of the cable is prolonged. A high-voltage breakdown protection layer in the cable is prevented from igniting external combustible gas, and the overall protection performance of the cable is improved.

The invention relates to the technical field of cable monitoring, and particularly discloses a power transmission equipment fault monitoring system based on an optical fiber sensor, and the system comprises a data collection module which comprises a cable data collection unit and an optical fiber data collection unit, and the cable data collection unit is used for collecting data information of a power transmission cable; the temperature correction and evaluation module is combined with data acquired by the data acquisition module to correct the temperature data of the cable monitored by the temperature measurement optical fiber, and the reliability and accuracy of the temperature monitoring data can be improved based on diversified data as a support, so that the accuracy of preliminary judgment of the running state of the cable is improved, and the working efficiency of the cable is improved. And then the real-time operation state risk coefficient of the power transmission cable is calculated through the data processing module in combination with the data of the temperature correction module and the data monitored by the operation state monitoring module, and the operation state of the transmission cable can be further analyzed, so that the accuracy and reliability of a cable fault monitoring result are improved.

The present disclosure relates to a flexibility-improved central tensile member for an overhead transmission cable, and an overhead transmission cable including the same. In particular, the present disclosure relates to a flexibility-improved central tensile member for an overhead transmission cable, and an overhead transmission cable including the same, wherein the central tensile member has excellent tensile strength and thus has excellent sag properties preventing the wired overhead transmission cable from sagging, and has sufficient flexibility and thus improves wiring workability. Moreover, the central tensile member can suppress corrosion and damage to a conductor wire arranged around the central tensile member and thus can eliminate or minimize an increase in resistance of the overhead transmission cable, as well as a resultant reduction in transmission capacity, and makes it possible to reduce weight and manufacturing costs of the overhead transmission cable.

The invention discloses a wire stranding device for network cable production, and relates to the technical field of network cable manufacturing, the wire stranding device comprises a plurality of tension adaptation assemblies, the tension adaptation assemblies are used for stranding a plurality of single-strand wires into a network cable core wire, the plurality of single-strand wires pass through a wire coil, and the network cable core wire is guided and limited by a stranding rack; the tension adaptation assemblies are arranged on the wire coil in an annular array mode, and each tension adaptation assembly comprises a pay-off groove which is formed in the wire coil. The tension adaptation assembly can automatically adjust the position of a guide wheel according to the real-time tension of a single-strand wire, dynamically balance the tension of the single-strand wire, ensure that the tension of the single-strand wire is always maintained in an ideal interval in the twisting process, avoid tensile failure caused by too tight tension or deformation caused by too loose tension, accurately control the tension to reduce the defects of back strand, loose strand and the like, and ensure the consistency of the physical structure of a network cable; meanwhile, the stable tension is beneficial to optimizing the twisting pitch and direction, the electrical performance of the network cable is improved, and the requirement of an intelligent power distribution system for the high-frequency data transmission cable is met.

The utility model relates to the technical field of signal transmission cables, and discloses a novel insulation co-extrusion double-coaxial high-speed data transmission cable, which comprises conductors, an insulation layer, a shielding layer and a sheath layer, and is characterized in that the two conductors are parallel to each other and are arranged at an interval; the insulating layer is uniformly and tightly wrapped on the outer sides of the two conductors, is a polytetrafluoroethylene insulating layer, and is simultaneously extruded at one time, so that the insulating layer is pushed and wrapped on the outer sides of the two conductors; the shielding layer comprises a first shielding layer and a second shielding layer, the first shielding layer wraps the outer ring of the insulating layer, and the second shielding layer wraps the outer ring of the first shielding layer; the sheath layer wraps the outer ring of the second shielding layer and is used for fixing and shielding protection. The two conductors are stranded bare copper, tinned copper wires or silver-plated copper wires. The cable has more reliable mechanical and physical stability, is more beneficial to coupling of an electromagnetic field, can reduce capacitance impedance, has lower time delay difference, and improves signal transmission speed and quality.

The utility model discloses a composite cable which comprises a composite cable, a plurality of supporting plates are vertically arranged in the composite cable at intervals, a center hole is formed in the center of each supporting plate in a penetrating mode, a plurality of through holes are horizontally formed in each supporting plate in a penetrating mode, and an air inlet cylinder is inserted in the center hole of each supporting plate in a penetrating mode. A communication cable and a conductive cable are inserted into the multiple through holes of the supporting plate in a penetrating mode, a supporting frame is vertically fixed to the outer end face of the supporting plate, and an exhaust cylinder is inserted into the supporting frame in a horizontal penetrating mode. According to the utility model, the problem that the heat dissipation effect of the composite cable is affected due to the fact that heat generated by the transmission cable core is accumulated in the composite cable and cannot be quickly dissipated and discharged because the existing composite cable is not provided with a heat dissipation structure is solved.

Disclosed is a non-steel high strength data transmission cable having a strength member (5) and a core (1). The high strength data transmission cable includes a length of a core-cable (10), the length of core-cable (10) includes core (1) plus at least one fiber-optic conductor (2) that is:(i) disposed in a helical shape; and(ii) completely encased in a solid, flexible material.Also disclosed is a process for making a high strength data transmission cable. The high strength data transmission cable is capable of being wound on a winch under tensions and surging shocks experienced by a fishing trawler, and provides high quality data signal transmission and resolution so as to permit use for transmitting data during fish trawl operation from high-resolution sonars used to monitor fish caught.

The invention discloses a multi-beam parallelism calibration device and method, and belongs to the technical field of laser ranging, the multi-beam parallelism calibration device comprises three laser ranging and adjusting modules, an L-shaped adapter plate a, a ground glass screen, an angle gauge, a bottom plate a and a precise parallel guide rail of a calibration part, and a CCD camera, a bottom plate b, a signal transmission cable and an upper computer of a signal receiving and processing part; a calibration device is adopted to emit three light sources to the frosted glass screen, the positions of three light spots on the frosted glass screen are determined through an image analysis method, and if the positions of the light spots are kept unchanged when the frosted glass screen is located at different positions of the guide rail, it is considered that light beams emitted by the three laser range finders are parallel to one another; and if the position of the light spot changes before and after the frosted glass screen moves, readjusting until the position of the light spot remains unchanged before and after the frosted glass screen moves. According to the invention, whether the light beams are parallel to each other can be rapidly evaluated, the parallelism between the light beams adjusted by the device is high, and the control plane angle measurement precision is greatly improved.

The utility model discloses an array type acoustic emission positioning device for monitoring soil deformation in real time, which belongs to the technical field of underground engineering construction and geological disaster monitoring and comprises an acoustic emission signal integrated processing box and a hollow penetration rod. An acoustic emission signal processing mechanism and a battery pack are integrated in the acoustic emission signal integrated processing box, and the acoustic emission signal processing mechanism collects and processes acoustic emission signals and gives feedback information; the penetration rod is of a hollow structure, the top end of the penetration rod is connected with the acoustic emission signal integrated processing box in a sealed mode, the lower portion of the penetration rod is composed of a plurality of sensor monomer assemblies distributed in an array mode, and the sensor monomer assemblies are electrically connected with the acoustic emission signal processing mechanism through signal transmission cables. According to the utility model, the acoustic emission source positioning technology is adopted to meet the requirements of slope stability monitoring, underground engineering construction disturbance monitoring and the like, and the system has the advantages of easy installation, strong real-time performance and high monitoring precision.

The invention discloses a fault judgment method and system for efficiently identifying and dividing cable fault types, and relates to the technical field of cable faults, and the method comprises the steps: detecting a fault traveling wave signal in a current power transmission cable, and obtaining a current fault traveling wave signal and a characteristic parameter of the current fault traveling wave signal, the characteristic parameters comprise arrival time, amplitude, gradient, spectral characteristics and transient energy; calculating the time difference of the fault traveling wave signal between different measurement points based on the arrival time, determining the fault position based on the time difference, carrying out analysis based on the amplitude, the gradient, the frequency spectrum characteristic and the transient energy to obtain a fault traveling wave characteristic pattern, and carrying out analysis based on the fault traveling wave characteristic pattern to obtain a fault type; and generating a fault indication signal and a fault maintenance scheme based on the fault position and the fault type, and sending the fault indication signal and the fault maintenance scheme to a preset client. By implementing the method, the accuracy of fault judgment of the power transmission cable can be improved.

The present application relates to the technical field of communications, and discloses an address allocation method, a battery module management method, and an electronic device. The address allocation method comprises: acquiring first device direct-current internal resistance of a first node and second device direct-current internal resistance of a plurality of second nodes that are in communication connection with the first node; according to a preset test rule, sequentially determining cable direct-current resistance between the first node and each second node among the plurality of second nodes; on the basis of the first device direct-current internal resistance, the second device direct-current internal resistance, and the cable direct-current resistance, determining the cable resistance value of a transmission cable between the first node and each second node; and on the basis of an ascending order of the cable resistance value, allocating a network address for each second node.

The utility model relates to a cathode mechanism and a magnetron sputtering device. The cathode mechanism comprises an end, the end comprises a supporting piece and a butt joint piece, a first wiring channel communicated with the outside is formed in the supporting piece, the butt joint piece is arranged on one side of the supporting piece, and an insertion cavity communicated with the first wiring channel is formed in the butt joint piece; the cathode target comprises a target tube and a magnetic bar connector, the target tube is detachably connected to one side of the end, the magnetic bar connector is arranged at the end, close to the end, of the target tube and inserted into the insertion cavity, and a containing cavity is formed in the magnetic bar connector; one end of the transmission cable is located outside the end, the other end of the transmission cable passes through the first wiring channel and is inserted into the containing cavity so as to be electrically connected with the magnetic bar connector, and the transmission cable is used for transmitting electric power and / or data signals. The cathode mechanism provided by the utility model is good in connection stability, and the reliability of the sputtering process is improved.

The embodiment of the invention relates to the field of neutron and gamma detection, in particular to a self-powered neutron and gamma integrated detector. The self-powered neutron-gamma integrated detector comprises a probe assembly and a control assembly, the probe assembly comprises a collector, a first insulating layer, a second insulating layer and emitters, the second insulating layer comprises a neutron insulating layer and a gamma insulating layer, and the emitters comprise a neutron emitter and a gamma emitter; the transmission cable is a three-core armored cable; the neutron insulating layer sleeves the outer side of the neutron emitter, and the gamma insulating layer sleeves the outer side of the gamma emitter; the neutron insulating layer is parallel to the gamma insulating layer; the first insulating layer is sleeved with the collecting body, and the bottom of the collecting body is filled with aluminum oxide powder; one end of the connecting device is connected with the receiving body, and the other end is connected with the cable housing. According to the embodiment, on-line measurement of the neutron signal and the gamma signal can be simultaneously carried out under the condition of high-temperature and high-pressure strong irradiation, and on-line monitoring of the neutron flux and the gamma flux of the reactor core can be simultaneously carried out.

The invention discloses a broadband and high-efficiency true time delay reflective array antenna, and belongs to the technical field of antenna engineering. Through the design of the broadband horn feed antenna, the broadband butterfly-shaped dipole antenna and the real-time-delay coaxial transmission line, high-efficiency directional radiation is realized. The gain bandwidth of the multi-layer patch type reflective array antenna is much larger than that of a traditional multi-layer patch type reflective array antenna; compared with a traditional transmission line phase modulation type reflective array antenna, due to stable time delay and shielding and no resonant structure, the antenna has better gain stability, and an in-band gain curve is increased approximately linearly. Finally, the antenna is simple in structure and can be realized only by a single-layer patch structure and a common coaxial transmission cable, and high-cost laminated patch processing is not needed.

Methods, systems, and apparatuses are provided for detecting events in proximity to one or more transmission lines or cables of a data, power, communications, and / or content data transmission system. Data indicating an event may be received. The data may indicate movement or deflection of a portion of the transmission line or cable. A location of the portion of the transmission line or cable may be determine. The location may be determined based on the received data. A classification of the event may be determined. For example, the classification of the event may be based on the data on the received data and the determined location. For example, the classification of the event may be determined by a machine-learning model. A response may be caused. The response may be associated with the portion of the cable. The response may be based on the classification of the event.

The utility model discloses a waterproof moisture-proof underground power transmission cable, which relates to the technical field of power transmission cables and comprises a polyvinyl chloride outer sheath, a polyvinyl chloride (PVC) inner sheath and a cable core, a cross-linked polyethylene insulating sleeve is arranged on the outer side of the cable core, and woven filler is arranged between the cable core and the PVC inner sheath. A waterproof sleeve, an outer semiconductor shielding sleeve and a water swelling strip are sequentially arranged on the outer side of the PVC inner sheath from inside to outside in a contact mode, annular grooves are formed in the outer side of the water swelling strip in the axis direction of the water swelling strip at intervals, V-shaped dredging grooves are symmetrically formed in the two sides of each annular groove, and the interiors of the annular grooves and the interiors of the V-shaped dredging grooves are communicated. According to the scheme, the water swelling strip is arranged between the polyvinyl chloride outer sheath and the outer semiconductor shielding sleeve, after water seepage occurs in the cable, the water swelling strip can continuously absorb water to swell, then irregular gaps in splicing seams can be formed, and the water stopping and waterproof effects are achieved.

The invention discloses a radiation-resistant all-digital high-frequency low-level control system which is characterized in that the system can be arranged on an accelerator site with strong radiation and is used for solving the problem that signals are interfered due to the fact that the signal transmission distance is too long. According to the system, the functions of all peripheral chips which cannot work normally due to strong radiation on the accelerator site are included in the radiation-resistant FPGA chip, and the functions of all the external chips and the original functions of the radiation-resistant FPGA chip are achieved through the radiation-resistant FPGA chip. The system is realized by using a single radiation-resistant FPGA chip, a high-frequency digital control algorithm is realized through firmware program design of the radiation-resistant FPGA chip, the control function of a high-frequency low-level control system is met, and the radiation-resistant problem of the whole system is directly solved. The system can be placed on the site of an accelerator, breaks through the limitation that a transmission cable needs to penetrate through a wall, is closer to a controlled object, and does not need a radio frequency cable to penetrate through a pipeline in the wall.

The utility model discloses an auxiliary device for erecting an electric power high-voltage transmission cable, and belongs to the field of electric power operation auxiliary equipment. An auxiliary device for erecting a power high-voltage transmission cable comprises a mounting base which is of a double-layer structure, and further comprises four groups of positioning bottom feet which are rotatably connected to the inner wall of the mounting base and are uniformly arranged; the supporting telescopic column is mounted on the top wall of the mounting base, and the top of the supporting telescopic column is connected with a conveying plate; the control mechanism comprises a transmission assembly and a gear assembly, the output end of the gear assembly is connected with a third rotating roller and a fourth rotating roller, a sliding groove is formed in the top wall of the conveying plate, and the third rotating roller and the fourth rotating roller are slidably connected to the inner wall of the sliding groove. The conveying mechanism is arranged on the top wall of the conveying plate; according to the utility model, the conveyed power transmission line can be clamped at any time, the tension of the installed power transmission line can be adjusted, the mechanism is simple, the conveying is convenient, and the use process is stable.

The utility model discloses a quick plug-pull type grain condition detector for a grain storage bin, which comprises sensors, a transmission cable and a hollow detection vertical rod, the transmission cable and the sensors are arranged in the detection vertical rod, the plurality of groups of sensors are connected and arranged on the transmission cable at intervals along the axial direction of the transmission cable, and the detection vertical rod is arranged on the transmission cable. Each group of sensors at least comprises one of a temperature sensing device, a humidity sensing device and a gas sensing device, and sensing signal output ends of the sensors are connected with sensing signal conductive wire cores in the transmission cable; the gas sensing device adopts one or more of a carbon dioxide sensor, an oxygen sensor, a phosphine gas sensor and a hydrogen fluoride gas sensor, an outer vent hole is formed in the rod wall of the detection vertical rod, an opening for a transmission cable to penetrate through is formed in the upper end of the detection vertical rod, and the lower end of the detection vertical rod is closed. According to the utility model, rapid insertion and extraction of the grain condition detector and temperature and humidity detection of grain piles at different depths are realized, and the detection efficiency of the grain storage bin is improved.

The invention discloses an address allocation method, a battery module management method and electronic equipment, and belongs to the technical field of communication. The method comprises the following steps: acquiring first equipment direct-current internal resistance of a first node and second equipment direct-current internal resistance of a plurality of second nodes which are in communication connection with the first node; according to a preset test rule, cable direct current resistance between the first node and each second node in the plurality of second nodes is determined in sequence; determining a cable resistance value of a transmission cable between the first node and each second node according to the first equipment direct-current internal resistance, the second equipment direct-current internal resistance and the cable direct-current resistance; and allocating network addresses to the second nodes according to the sequence of the cable resistance values from small to large. Therefore, through the cable resistance value of the transmission cable between the first node and the second node, the physical sequence of cable connection of the node equipment is determined, and the corresponding network address is allocated to each node, so that the complexity of a communication interface can be reduced, and the reliability of the system is improved.

The invention relates to an offshore wind power plant power transmission system fault identification and early warning protection method based on data-driven state estimation, and the method comprises the steps: constructing a global state unified model adaptive to an offshore wind power heterogeneous topology, and building a state estimation model of a long-distance transmission cable; cable end measurement data are collected, and a state estimator is obtained by combining the state estimation model of the long-distance sending cable; based on the state estimator, calculating a residual error and fitting an error; and according to the residual error and the fitting error result, judging whether a fault occurs or not, carrying out fault positioning and classification, and outputting corresponding protection action and alarm information. Compared with the prior art, a distribution parameter modeling-state resolving-residual error discrimination three-layer nested architecture is adopted, a physical model and state mapping relation is constructed, the state quantity is estimated by using the least square, and the residual error amplitude, the phase angle change and the spatial distribution characteristics are fused, so that the stability of the state estimation is improved. According to the invention, high-precision fault identification and positioning can be carried out on the multi-section heterogeneous delivery cable, and timely early warning protection can be carried out.

The invention relates to a multi-signal fusion real-time deduction method for three-dimensional wave parameters along with a ship, and a deduction device consists of a state sensor, a one-way stress sensor, a vertical acceleration sensor, a shunt, a terminal junction box, a signal acquisition instrument, a host, analysis software, a signal transmission cable and the like. The deduction method comprises the processes of system state matrix discretization, transfer function calculation, Kalman filtering deduction model construction, convergence analysis, result comparison and the like, and three-dimensional time-frequency parameters of waves are deduced in real time through fusion analysis of ship motion and actual measurement data of a key position stress response sensor. Real-time information of surrounding waves can be provided for more sailing ships, more comprehensive reference basis can be provided for ship sailing and ship type optimization, and the method has practical significance and market value.

The utility model relates to the technical field of information transmission, and discloses a communication interface, a transmission wire rod, a function module and electronic equipment, the communication interface is obtained by redefining part of pins in a universal serial bus (USB) Type-C interface, and the communication interface is characterized in that four VBUS pins in the USB Type-C interface are configured to input a first voltage; the two SBUS pins are configured to input a second voltage, and the first voltage is greater than the second voltage; the two CC pins are configured as signal detection ends; and the two D + pins and the two D-pins are respectively configured as a serial port transmitting end and a serial port receiving end. By redefining the pins of the USB Type-C interface, the expansion of interface functions, such as data two-way transmission, support of different power supplies and the like, can be realized, so that the application scene of the communication interface is increased, and the like.

The utility model discloses a farmland leaching layering monitoring well system which comprises a layering monitoring well which comprises an upper well pipe, a middle well pipe and a lower well pipe. The root layer is provided with an upper well pipe, the aeration zone is provided with a middle well pipe, the aquifer is provided with a lower well pipe, and the underground water level is higher than the bottom surface of the lower well pipe. The pipe diameters of the upper, middle and lower well pipes are sequentially reduced. The upper well casing and the middle well casing are connected through connecting plates, and the middle well casing and the lower well casing are connected through connecting plates. At least one soil parameter detection sensor is arranged in the root layer, the aeration zone and the water-bearing layer, a water quality sensor is arranged in underground water in the lower well pipe, and a transmission cable led out of the soil parameter detection sensor penetrates through the well wall of the layered monitoring well, then is converged with a transmission cable led out of the water quality sensor and extends upwards to be connected with an overground monitoring instrument. And the plate for manufacturing the connecting plate is the same as the pipe of the adjacent corresponding well casing. The underground parameter monitoring device is designed according to a root layer-aeration zone-aquifer shallow critical stratum structure, and underground parameters can be comprehensively and accurately monitored in the farmland leaching process.

The invention relates to the technical field of hoisting equipment, and discloses a transportation deviation prevention electric hoist assembly which comprises a connecting shell, a dust collecting pipe and a limiting frame, a conveying groove is formed in the bottom of the connecting shell, the limiting frame is installed at the bottom of the connecting shell and corresponds to the conveying groove in position, and a conveying mechanism is installed in the connecting shell and comprises a rotating shaft and a positioning disc. The positioning disc is installed in the connecting shell, the transmission wheel is installed at one end of the positioning disc, the control motor can drive the transmission wheel to rotate, a threaded shaft is movably clamped in the positioning disc, the threaded shaft movably sleeves one end of the transmission wheel and can axially move, the rotating shaft is installed on one side of the threaded shaft, and a transmission cable is wound on the rotating shaft; compared with the prior art, in the recovery process of the transmission cable, when the threaded shaft drives the rotating shaft to move axially, the transmission cable can be evenly laid on the surface of the rotating shaft, and the situation that the transmission cable is disordered when being recovered and wound can be reduced.

The utility model provides an anti-interference electroencephalogram collecting device which comprises a collecting module and a signal processing module, the signal processing module is connected with the collecting module through a shielding transmission cable, and a shielding cover used for restraining radiation electromagnetic interference is arranged outside the signal processing module. And the shielding cover is connected with the shielding layer of the shielding transmission cable and the input end of the signal processing module in a single-point connection mode. When electroencephalogram signals are collected, the collecting module responds to control signals input externally, electroencephalogram signals of a patient begin to be collected, and the electroencephalogram signals are output after being subjected to signal processing such as filtering and amplifying through the signal processing module. According to the electroencephalogram signal acquisition device, multiple inhibition barriers of the shielding case and the shielding transmission cable are arranged, so that the interference of radiation electromagnetism on the acquired electroencephalogram signals is effectively inhibited, and the effectiveness and accuracy of electroencephalogram signal acquisition are ensured.

The utility model discloses a signal output detection tool of a terahertz signal up-down frequency converter, and belongs to the field of frequency converter detection equipment. The problems that internal circuits are prone to interweaving and winding and the heat dissipation performance is poor are solved. A connecting column is fixedly installed on one side of the shell, a cover body is fixedly installed on the top of the shell, a wire arranging assembly and an adjusting mechanism are movably installed in the shell, the wire arranging assembly is located below the adjusting mechanism, a transmission line and a fan are fixedly installed in the shell, the transmission line is located above the adjusting mechanism, and the fan is located on one side of the wire arranging assembly. According to the utility model, the fixing ring is used for fixing lines, so that the lines in the shell are arranged, the internal lines are effectively prevented from being easily interwoven and wound, the signal quality and accuracy are improved, meanwhile, the rotating rod is rotated to drive the baffle to move, a heat dissipation gap is formed in one side of the shell, and the heat dissipation effect is improved through the cooperation of the fan and the heat dissipation gap. And the heat dissipation performance in the detection tool is effectively improved.

The invention belongs to the technical field of vibration control, and discloses a tuned mass damping device for controlling low-frequency vertical bending vortex vibration of a large-span bridge, which consists of a fixed pulley, a mass block, a high-strength light force transmission cable, a spring, a hanging ring and a damper. Fixed pulleys and mass blocks are arranged at the positive and negative maximum displacement positions of a longitudinal bridge direction mode of a main beam respectively, a suspension system is formed by a full-length force transmission cable, and the gravity of the two mass blocks is basically balanced; the mass block is connected through the spring and is close to the bridge vibration control target frequency. When the bridge vibrates, the two mass blocks generate inertia forces which are opposite in direction but overlapped with each other, the driving system and the bridge form resonance, and therefore bridge vibration is effectively restrained. The gravity of the mass block can be self-balanced, the strength and the number of the springs are greatly reduced compared with those of a traditional TMD, any low-frequency tuning can be conducted in a vertical limited space, and the engineering cost is remarkably reduced. The device can be used for controlling vertical bending and torsional vibration of various engineering structures; the damper is replaced by an actuator, so that active control can be realized or the damper can be used as a structural excitation device.

The utility model relates to the technical field of mine pipeline gas monitoring, and discloses a pipeline gas monitoring alarm device. The pipeline gas monitoring and alarming device comprises a supporting frame, a shell is movably installed above the supporting frame, a receiving and transmitting antenna is fixedly installed above the shell, a wireless serial port receiving and transmitting module and a logic controller are fixedly installed on the front side of the top face of the supporting frame, and the logic controller is connected with the wireless serial port receiving and transmitting module through the wireless serial port receiving and transmitting module. The devices are not connected through a signal transmission cable, and in the installation process, the upper end of the fixing bolt exerts certain pressure on the protection pad by adjusting the tightness of the fixing bolt, so that the relative static friction force between the protection pad and the gas pipeline is increased, and the relative position between the supporting frame and the gas pipeline is limited; and after the installation is completed, the storage battery is connected to a power supply line in the mine through the cable, so that the step of applying a signal transmission cable connecting device is omitted, and the installation operation is quicker.

The embodiment of the utility model provides a rotary connection structure which is used for a terminal support, the terminal support is used for supporting a shooting terminal, the rotary connection structure comprises a first arm body and a second arm body, and the second arm body is rotatably installed on the first arm body around a first axis; the rotating connection structure further comprises a transmission cable used for transmitting signals and / or electric energy, the transmission cable is installed on the first arm body and extends to the second arm body from the first arm body, and the first maximum rotating angle, around the first axis, of the second arm body relative to the first arm body is smaller than or equal to 270 degrees. The embodiment of the utility model further provides a terminal support. By implementing the rotary connection structure, multi-circle rotation of the second arm body relative to the first arm body is avoided, and transmission cable damage caused by excessive torsion of the transmission cable is avoided.