67results about How to "Improve device security" patented technology

Machine for gymnastic exercises comprising a sliding rail (3), a carriage (4) installed in a sliding manner on the sliding rail (3), a first pulley (21) and a second pulley (22) installed on the carriage (4) and rotatable in an idle manner around respective axes of rotation, a gripping element (6), cable traction means (16) comprising a first cable branch (a) and a second cable branch (b) provided with respective and separate connection ends (17) attached to the gripping element (6). The first cable branch (a) and the second cable branch (b) wind at least partly around the first pulley (21) and respectively the second pulley (22) to define first return segments (23) comprised between the gripping element (6) and respectively the first pulley (21) and second pulley (22), and second return segments (24) that extend one on a first side (25) and the other on a second side (26), opposite the first side (25), of the carriage (4) and substantially parallel to the sliding rail (3).

The invention relates to a small-target surface vertical target dispersion photoelectric measurement device. The traditional contact measurement method has the problems that the labor intensity is high, the measuring results are greatly influenced by manual work, and particularly repeated holes cannot be identified and the measuring results cannot be provided in real time. A laser light source assembly is arranged symmetrically on the lateral surface of a linear array CCD camera, an emergent main axis of the laser light source assembly is coplanar with a main axis of the linear array CCD camera, and an original-direction reflecting film is opposite to the linear array CCD camera and vertical to a light curtain sent by the laser light source assembly. The device adopts an integrated structural design, forms the light curtain converged relative to the CCD camera by matching the laser assembly of a small-power semiconductor laser and the low-cost original-direction reflecting film, reliably acquires the information of positions where bullets pass through the light curtain, effectively solves the problems of unstability and low sensitivity of light used indoors during a CCD convergence test, and has the advantages of convenient installation and debugging, simple structure, and high safety of personnel and equipment.

The invention relates to a branch control phase inversion heat exchange system and a branch control phase inversion heat exchange method based on a vapor-liquid heat exchanger. The system comprises a liquid storage tank (20), a heat source heat exchanger (3), a cold source heat exchanger (15) and a vapor-liquid heat exchanger (9); an upper collection tank of the heat source heat exchanger (3) is communicated with the vapor-liquid heat exchanger (9) through a heat exchanger inlet steam pipe (8); a vapor-liquid heat exchanger outlet steam pipe (10) which is arranged on the vapor-liquid heat exchanger (9) is divided into two branches which are communicated with an upper collection tank and a lower collection tank of the cold source heat exchanger (15); the lower collection tank of the cold source heat exchanger (15) is communicated with the upper part of the liquid storage tank (20) through a cold source heat exchanger liquid outlet pipe (17); the bottom of the liquid storage tank (20) is communicated with the vapor-liquid heat exchanger (9) through a heat exchanger inlet condensation liquid pipe (11); and the vapor-liquid heat exchanger (9) is communicated with a lower collection tank of the heat source heat exchanger (3) through a heat exchanger outlet condensation liquid pipe (6). The branch control phase inversion heat exchange system can solve the phenomena of overcooling and overheating and improve heat exchanging efficiency.

The invention discloses an energy-saving type quick start method for a supercritical unit or an ultra-supercritical unit. According to the method, steam from another resource is used for heating supplied water so that a boiler can be indirectly heated, and the thermal stress of a heated surface is reduced when the boiler is started so that the heating rate of the boiler can be improved; meanwhile, the heated high-temperature supplied water is converted into steam-liquid two-phase flow through throttling and pressure reduction, the flowing scouring action of the steam-liquid two-phase flow is far superior to the effect of thermal-state washing, and in other words, the boiler can complete thermal-state washing under the non-ignition condition, and can preheat the whole heated surface before ignition till certain pressure is reached. After ignition of the boiler, due to the fact that enthalpy of subcooling on an inlet of a water wall is eliminated, the problem of water power can be readily solved and the input speed of fuel can be increased. Meanwhile, by adjusting the open degree of a turbine bypass valve, the flow, the temperature rising speed and the pressure rising speed of main stream and reheat steam are controlled, and the temperature rising speed of the heated surface of the boiler is increased; when the temperature of the main steam and the temperature of the reheat steam are larger than the temperature of a turbine heating valve, valve heating is started, and a main machine can early satisfy the impulse starting condition.

The invention relates to a wearing and clogging diagnosing method of an SCR denitration catalyst. The method comprises: graphical representation and marking are carried out on wearing and clogging situations of a catalyst inside a reactor and a visual cloud chart is drawn; sampling is carried out on the catalyst inside the reactor and mechanical property detection and analysis are carried out on the catalyst to obtain detection and analysis data of the catalyst; field detection of denitrification equipment is carried out to obtain data of an actual flow field operation situation of the denitrification equipment; on the basis of CFD numerical value simulation and physical model testing, a model consistent with the catalyst structure and the internal structure of the reactor is established; and with the visual cloud chart, the data and the model, causes of wearing and clogging of the catalyst are obtained. With the diagnosing method provided by the invention, a catalyst operation problem of a power plant is solved; the operation economy and equipment safety of the denitrification equipment are improved; exploration of diagnosing the wearing and clogging problems of the SCR catalyst is carried out; and thus the service life of the catalyst is prolonged and the risk of the operation accident of the denitrification equipment is reduced.

The invention discloses a heat exchanging component made of ceramic materials and a preparation method thereof, and more specifically relates to a ceramic material, a ceramic heat exchanging component, and preparation methods thereof, wherein the ceramic material has the properties of thermal shock property, corrosion resistance, wear resistance, low cost, high strength, high heat exchange efficiency, and the like. According to the invention, the ceramic material and the ceramic heat exchanging component are prepared through selecting 70-85% of silicon carbide, 0-5% of silicon nitride, 0-5% of theron, 0-5% of aluminum nitride, 0.9-3.2% of a fluxing agent, 10-20% of a binder and 0-2.5% of a forming additive; the heat exchanging component has good thermal conductivity and thermal shock properties, especially when the heat exchanging component is used for waste heat recovery, the temperature of tail gas discharged by oil and gas combustion can be reduced to a temperature below the water dew point, so that the sensible heat in the tail gas is fully recovered, and the latent heat of liquefaction of dry steam is recovered, therefore, the heat exchanging component made of ceramic materials and preparation method thereof disclosed by the invention provide a new technical route for a process for the effective governance of tail gas discharged by oil and gas combustion, and can be applied to a technical scheme of effectively preventing the formation of a haze weather caused by oil and gas combustion emissions.

The invention discloses a shear-fork type lifting device for an aerial work platform. The shear-fork type lifting device for the aerial work platform is characterized by comprising a shear-fork type lifting structure and a work platform. The shear-fork type lifting structure comprises upper shear-fork units, lower shear-fork units and a lifting oil cylinder. The multiple upper shear-fork units are sequentially hinged from bottom to top, and the multiple lower shear-fork units are sequentially hinged from bottom to top. A wiring pipeline structure is arranged on the shear-fork type lifting structure. The wiring pipeline structure comprises wiring hard pipes, wiring flexible pipes and control wires used for controlling the work platform. The wiring hard pipes are fixed on the shear-fork type lifting structure. On the premise of guaranteeing the lifting height, by reducing the thickness of the upper shear-fork units, the weight borne by a lifting hydraulic cylinder is lowered, the efficiency and the safety of a device are improved, and the control wires can be well protected in the wiring hard pipes.

The invention discloses a method and system for preventing a mobile terminal from being unlocked. The method comprises the following steps: A, transmitting fingerprint data input by a user in advance to a TEE TA to encrypt the fingerprint data, and then writing the encrypted fingerprint data in a RMPB storage region; B, when needing to be unlocked, receiving the fingerprint data input by the user at present, and acquiring the fingerprint stored in the RPMB storage region, and then decrypting the fingerprint data, comparing the fingerprint data input at present with the decrypted fingerprint data, and then judging whether to unlock according to a comparison result. By use of the method disclosed by the invention, the fingerprint data of the user is encrypted in advance and then written in the RMPB storage region, even though other person picks up the user mobile phone, the user important information cannot be stolen, and the equipment security of the mobile terminal is improved.

The invention discloses an automatic punching device. The automatic punching device comprises a feeding conveying panel; a material storage shell is arranged on one side of the feeding conveying panel; a feeding mounting plate is arranged on the surface of the front side of the feeding conveying panel; the rear side of one end of the feeding conveying panel is provided with a punching device body;the punching device body comprises a punching shell, a punching panel, a punching bottom plate, a punching top plate, a laser sensor, a hydraulic cylinder, a hydraulic rod, a hydraulic motor and a support base; and a discharging conveying panel is arranged on the outer side of the punching device body. By arranging the feeding conveying panel and the feeding mounting plate, plates stored in the material storage shell can be pushed onto the feeding conveying panel for conveying by starting a servo motor, when the plates are conveyed between the punching device body and the feeding mounting plate, a push plate is pushed by operating a first electric push rod to push the plates from a material distribution panel into the punching device body, manual operations such as material punching, conveying, feeding and discharging on all punching stations can be replaced, and the labor cost is reduced.

The invention discloses an automatic piecing device and an automatic piecing method for cord fabric. The automatic piecing device for the cord fabric comprises a material head fixing mechanism and a piecing press roller mechanism which are used for connecting a material head and a material tail in a pressing mode. The material head fixing mechanism comprises a support, an overlap connection roller, an overlap connection plate, a press roller mechanism and a guide roller. The support is provided with the overlap connection roller, the press roller mechanism and the overlap connection plate. The press roller mechanism is used for pressing and fixing the material head overlapping the overlap connection roller. The guide roller is used for guiding and introducing the material head of the cord fabric to the overlap connection roller. According to the automatic piecing device and the automatic piecing method for the cord fabric, there is no requirement for the quality of the cord fabric, and the position of a connector can be adjusted at any time. The cord fabric is not liable to damage. The automatic piecing device and the automatic piecing method can be applied to fiber cord fabric or steel wire cord fabric, and do not need a manual operation, and is high in automation degree, production efficiency and safety of equipment.

The invention provides a welding device and a combustion arc determining treatment method and device and relates to the technical field of welding. The combustion arc determining treatment method is used for the welding device. The welding device can give out a combustion arc determining signal. The combustion arc determining treatment method includes the steps that the combustion arc determining signal is received; an output current of the welding device is acquired; a given voltage of the welding device is determined; the given voltage is controlled to be not larger than a first threshold value; whether the output current of the welding device descends or not is judged; and when the output current descends, it is determined that the welding device enters a combustion arc segment.

The invention relates to a sensor support mechanism for an ultrasonic partial discharge live detector and belongs to the technical field of GIS (gas insulated switchgear) potential fault diagnosis. The mechanism comprises an insulation rod, a sensor fixing end, a rotary support rod, an ultrasonic sensor placement chamber, an ultrasonic signal amplifier placement groove and the like, wherein the upper end part of the insulation rod is a sensor connection end, the sensor fixing end is linked with the insulation rod through a connection rod, a penetrating screw is arranged at the sensor fixing end, one end of the rotary support rod is arranged on the penetrating screw of the sensor fixing end in a sleeving mode, the rotary support rod is relatively fixed with the sensor fixing end through a rotation direction fixing screw, the ultrasonic sensor placement chamber is fixed at the other end of the rotary support rod, and the ultrasonic signal amplifier placement groove is fixed on the insulation rod through a placement groove fixing screw. The sensor support mechanism can improve live detection personal and equipment safety and improve the live detection efficiency greatly.

The invention discloses a constant-pressure tool changing cutterhead with a freezing function. The constant-pressure tool changing cutterhead comprises a circular cutterhead body; the circular cutterhead body comprises a plurality of normal-pressure tool changing radial arms and a plurality of auxiliary beams; the plurality of normal-pressure tool changing radial arms are respectively connected with the plurality of auxiliary beams, and a plurality of normal-pressure tool changing tools are arranged on the normal-pressure tool changing radial arms; refrigerating pipelines are arranged on the lateral side faces of the normal-pressure tool changing radial arms, inner panels, the outer surfaces of the panels or the interiors of the panels, the refrigerating pipelines are provided with first inlets and outlets used for injecting or discharging low-temperature cooling liquid, heat insulation pipelines are arranged between the refrigerating pipelines and a cutterhead flange, and the heat insulation pipelines are provided with second inlets and outlets used for injecting or discharging heat insulation liquid. By means of the normal-pressure tool changing cutterhead with the freezing function, the normal-pressure tool changing cutterhead can be adopted for frequently changing tools, a tunnel face can be frozen by arranging the freezing pipelines, and it can be guaranteed that the cutterhead enters an excavation bin to work under special conditions. The construction efficiency and the equipment safety are improved, and the construction cost is reduced.

The invention discloses a depth indicator which is used for indicating the running position of a mine lifting device, comprising a frame and a rotatable screw which is vertically installed on the frame; the indicator is installed on the screw; a scaling stripe is installed on the frame; one end of a horizontal axis which is flexibly connected on the frame is provided with a rotating wheel and the other end is provided with a first bevel gear; the lower end of the screw is provided with a second bevel gear; and the first bevel gear and the second bevel gear are meshed with each other. The invention has simple structure, easy manufacturing, convenient maintenance, low manufacturing cost and good application prospect.

The invention discloses a power equipment management method and device based on the Internet of Things, equipment and a storage medium, and relates to the field of power equipment control. Whether the power equipment meets the communication condition or not is judged according to the validity of the key of the power equipment, so that the authenticity and reliability of the received data uploaded by the power equipment are improved; and through association between the application scene and the power equipment, the data can be processed more accurately, more accurate power equipment information can be provided for a user, and the data management efficiency and the equipment security of the power equipment are effectively improved. The invention also discloses a corresponding power equipment management device, equipment and a storage medium, the authenticity and reliability of power equipment data uploading can be improved, and the data management efficiency and equipment security of the power equipment are effectively improved by processing the data in combination with the scene.

In a heater including a plurality of first temperature detection elements that are arranged at predetermined intervals in a longitudinal direction of a substrate and respectively output temperature signals individually, and a plurality of second temperature detection elements that are arranged at predetermined intervals in positions that differ from the positions of the first temperature detection elements in a lateral direction that is orthogonal to the longitudinal direction but correspond to the positions of at least some of the plurality of first temperature detection elements in the longitudinal direction, and that output a single temperature signal obtained by adding individual temperature signals together, the individual temperature signals included in the single temperature signal are acquired on the basis of the plurality of temperature signals output by the plurality of first temperature detection elements and the single temperature signal.

The invention discloses a supporting tool for an ultrahigh-frequency sensor and an ultrasonic sensor used for discharging electrified detection of a gas insulated switchgear (GIS). The supporting tool comprises an insulating rod, a sensor fixing clamp seat and an accessory fixing clamp seat, wherein a rotating structure is arranged between the insulating rod and the sensor fixing clamp seat. The supporting tool is characterized in that the sensor fixing clamp seat adopts a door-shaped structure; an ultrasonic sensor special base is arranged in the door-shaped structure, is made from insulating materials, and comprises two parts which are eudipleural; and after the two parts are jogged, the upper part surface of the ultrasonic sensor special base is an arc-shaped contact surface, a columnar hole is formed in the middle part of the ultrasonic sensor special base, and hard sponge cushions are arranged at the bottom of the columnar hole. The supporting tool disclosed by the invention is compact and flexible, convenient to carry, convenient to operate and good in insulation, and can be used as a special supporting tool of an ultrasonic wave sensor and an ultrahigh frequency sensor of which the shapes are completely different; the supporting tool is simple in structure, low in cost, convenient and quick to use and labor-saving, and the working efficiency of the electrified detection is improved.

The invention provides an arc-resistant constant voltage static contact group, movable contact group and movable and static contact group for an electric switch machine, relates to the technical fieldof machine electricity, and solves the technical problem that when an existing movable and static contact group is connected or disconnected, electric arcs generate easily. The arc-resistant constantvoltage static contact group comprises a left contact strip and a right contact strip which are arranged oppositely, the left contact strip and the right contact strip are both provided with static contact group magnetic substances, and the static contact group magnetic substance located at the left contact strip and the static contact group magnetic substance located at the right contact strip are attracted through magnetic force; the arc-resistant constant voltage movable contact group comprises a base body and a movable contact, the movable contact is provided with a movable contact groupmagnetic substance, and the upper magnetic pole and lower magnetic pole of the movable contact group magnetic substance are opposite; and the arc-resistant constant voltage movable and static contactgroup comprises an arc-resistant constant voltage static contact group and an arc-resistant constant voltage movable contact group. The arcs generated in the process of inserting in or pulling out theleft contact strip and the right contact strip can be subverted through the magnetic line released by the static contact group magnetic substance and / or the movable contact group magnetic substance.

The invention discloses an automatic adjusting machine for a projection welding nut, which comprises a nut screening and adjusting device and a machine body motion driving device, wherein the nut screening and adjusting device consists of an adjusting disk, a height limiting block, a first-stage screening and limiting block and a second-stage screening and limiting block; the adjusting disk is a disk which is internally provided with a spirally-raising channel; the spirally-raising channel of the adjusting disk is outwards arranged from the center of the disk; the height limiting block is a wedged block and is fixedly arranged on the bottom surface of the spirally-raising channel; the first-stage screening and limiting block consists of a lug boss arranged on the bottom surface of the spirally-raising channel and a stop block arranged on the side wall of the spirally-raising channel; the structure of the second-stage screening and limiting block is the same as that of the first-stage screening and limiting block; and the height limiting block, the first-stage screening and limiting block and the second-stage screening and limiting block are sequentially arranged along the spirally-raising channel. According to the automatic adjusting machine, the spirally-raising channel of the adjusting disk, a limiting device and a pneumatic control device are arranged to realize the automatic operation of the adjusting and the conveying of the projection welding nut; and the automatic adjusting machine is suitable for adjusting operations of various projection welding nuts.

The invention discloses a low-voltage capacitor element replacing device for a 500kV transformer station, and the device comprises a traveling mechanism and a suspension mechanism. The traveling mechanism comprises a cuboid frame and a guide rail, and the guide rail is provided with an electric block. The suspension mechanism comprises front suspension assemblies and rear suspension assemblies, wherein the front and rear suspension assemblies are located at two ends of the traveling mechanism. There are two groups of front suspension assemblies, and each group of front suspension assemblies comprise a front upper clamping part, a front lower clamping part, and a front threaded suspension rod, wherein the front threaded suspension rod enables the upper end of the cuboid frame to be fixed with a capacitor platform frame. There are two groups of rear suspension assemblies, and each group of rear suspension assemblies comprise a rear upper clamping part, a rear lower clamping part, and a rear threaded suspension rod, wherein the rear threaded suspension rod enables the lower end of the cuboid frame to be fixed with the capacitor platform frame, and the front end of the cuboid frame stretches out of the capacitor platform frame. The device is provided with the traveling mechanism and the suspension mechanism, effectively simplifies the operation process, and reduces the workload. Moreover, an extending board is provided with through holes in different shapes, thereby achieving the suspension of the device exactly above a capacitor, and facilitating the quick operation.

The invention relates to an arc extinguishing spray pipe for a gas generating and arc extinguishing device. The arc extinguishing spray pipe comprises an insulating sleeve, wherein the insulating sleeve is internally provided with a flow guiding chamber, a flow resisting chamber and a buffer chamber in sequence, the three chambers complement each other, simultaneously act on arc extinguishing andreduce the air impact to the lowest, the flow guiding chamber is internally provided with a conical thermal insulation inner sleeve I and is provided with a gas generating and arc extinguishing plastic layer at the same time, the gap gradually becomes smaller when an air flow passes through the conical cavity, the arc energy is concentrated, the plastic layer is gasified, the air flow after the gasification is concentrated around the arc again, and the arc is gradually elongated while the arc energy is consumed. When the arc with the energy being reduced passes through the flow resisting chamber, the flow resisting chamber is provided with a blocking ball at the central position, so that the air flow and the arc simultaneously collide the blocking ball made of an insulating material and then flow around, and the arc can be effectively extinguished in the step. Meanwhile, the impact force of the air flow is reduced, then the air flow flows through the buffer chamber, so that the impactforce of the air flow is further reduced, and the safety coefficient of the device is improved.

The invention discloses an automatic barring device. The barring device comprises a barring drive motor and a worm and gear mechanism used for being connected with the barring drive motor, wherein a lead screw sleeves the worm and gear mechanism and provided with a moving gear used for being meshed with a barring gear, and the barring gear is connected with a steam turbine. The barring device alsocomprises a barring input device used for abutting against the moving gear and a controller used for controlling the barring drive motor and the barring input device. According to the automatic barring device, by automatically controlling the barring drive motor and the barring input device, not only can the labor intensity be reduced, time and labor are saved, but also the errors and risks caused by field operation can be avoided, and the safety of personnel and equipment can be effectively improved. The invention also discloses an automatic barring control method.

The invention discloses an ore pulp grade measurement and analysis device for ore dressing production. The device comprises a main control unit, a measurement unit, a calibration unit, a collimation unit and a temperature control unit. Ore pulp sampling equipment is installed in a stirring barrel nearby; and data analysis processing upper software is installed in a PC industrial personal computer.The main control unit adopts an STM32F407ZET6 series as a microprocessor. The measurement unit consists of an X-ray tube, a high-voltage power supply and a detector. The calibration unit is composedof a detection execution mechanism and a stepping motor control module. The collimation unit includes a collimator and an optical filter. The temperature control unit includes a semiconductor chillingplate and a microcomputer temperature controller. According to the invention, with an embedded system with STM32 as a core, the X-ray tube with a high-voltage power supply device and an imported detector, the measurement precision and stability of the device and the technical advancement of the core control mainboard can be improved; and adverse effects caused by use of a nuclear source can be eliminated.

The invention discloses a blister subsequent die cutter cutting forming device, which comprises an outer bracket structure, an inner bracket structure, a press roller motion mechanism, a die cutter overturning mechanism, an automatic air blowing mechanism and an electronic control mechanism. The inner bracket structure is located in the outer bracket structure; the outer bracket structure is provided with the press roller motion mechanism and the electronic control mechanism; and the inner bracket structure comprises the die cutter overturning mechanism and the automatic air blowing mechanism.The blister subsequent die cutter cutting forming device has the beneficial effects that the automation degree is high, terminal collision protection is provided, thus the labor intensity of an operator is relieved, the maximum service life of a die cutter is guaranteed, the pass rate of product cutting is also guaranteed, the production capacity is improved, energy consumption is lowered, and the safety of persons and equipment is guaranteed.

The invention provides a device for accommodating collecting equipment samples. The device comprises a box body (10), a cover body (20) and a support body (30), wherein a cavity is formed in the box body (10); the cover body (20) is connected onto the box body (10) in an open-close manner; the support body (30) is arranged in the cavity; a plurality of grooves (31) matched with the collecting equipment samples are formed in the support body (30) and mutually independent. Through the adoption of the device, the problem of a potential safety hazard in the accommodating of the collecting equipment samples in the prior art can be effectively solved.

The invention relates to a multifunctional outdoor equipment monitor which comprises a shell, alarm indicator lamps, loudspeakers, a plurality of anti-tamper sensor interfaces, an equipment interface, an SIM (subscriber identity module) card holder and a circuit. Two rows of alarm indicator lamps are uniformly mounted in the middle of the front of the shell at intervals, the anti-tamper sensor interfaces are uniformly formed in the upper side of the back of the shell at intervals, the SIM card holder and the equipment interface are sequentially formed below the anti-tamper sensor interfaces in the shell, one loudspeaker is mounted on each of the left side and the right side of the back of the shell, the circuit is mounted inside the shell and comprises an arm processor, a storage unit and a GSM (global system for mobile communications) module, a battery supplies power for the circuit, and the arm processor is respectively connected with the storage unit and I / O (input / output) of the GSM module. The monitor has multichannel defense area functions and is provided with a multichannel defense area, one monitor can be connected with a plurality of anti-tamper sensors, alarm modes are varied and flexibly selected, alarm is accurate, and failure in alarm and false alarm are avoided.

The invention provides an industrial air conditioner fault diagnosis method based on a neural network and an integrated learning algorithm. The method fuses various machine learning algorithms, and is a fault diagnosis model with high accuracy. The neural network automatically extracts output and a 'reasonable rule' between output data through learning, and plays an important role in analyzing time sequence data received by the industrial air conditioner in real time. Therefore, an anomaly detection module based on a neural network algorithm is designed. The integration algorithm has the obvious advantages of avoiding overfitting, improving generalization ability and the like. Therefore, a fault diagnosis module based on an ensemble learning algorithm is designed. An anomaly detection model is combined with a fault diagnosis model, and an attention mechanism is introduced, so that detected anomaly auxiliary fault diagnosis forms an enhanced model which is more accurate than a basic model. According to the invention, accurate fault diagnosis can be carried out on industrial air conditioner data.

The invention relates to a monitoring system of a distribution transformer. The monitoring system of the distribution transformer comprises an audible and visual alarming device, a monitoring sensor and a computer background management system; the audible and visual alarming device is fixed to a pole which is 3m above the ground; the monitoring sensor is adhered to a housing of the distribution transformer by an attaching manner through a magnet; after the monitoring sensor is removed from the housing of the distribution transformer, the audible and visual alarming device at the site is automatically started and sends alarming information to mobile phones of responsible persons in a form of a short message, and the responsible persons are sequentially called and reminded to check the short message through the mobile phones, and meanwhile, the information is transmitted to a background for backup, and people on dusty is reminded through the background by a sounding and screen flickering manner. According to the monitoring system of the distribution transform, diverse alarming manners are provided and can be selected flexibly; the monitoring system of the distribution transformer is novel in structure, safe and reliable, convenient to network, accurate to alarm, and free of alarm failure and false alarm.

The invention provides an APF / SVG relay state detection system, which can prevent influence on a system and a power grid when a relay fails, and can realize timely protection, reduce a failure rate and improve equipment safety. The system comprises a charging module connected to a power grid, an IGBT module, a relay and a circuit breaking module connected with the power grid. The system also comprises a LCL filtering module, a charging module, a voltage sampling module, a signal comparison module and a control module; The LCL filtering module is connected between the circuit breaking module and the charging module and is used for filtering harmonic waves; the charging module is sequentially connected with the IGBT module and the bus voltage protection module and is used for charging the bus voltage protection module; the voltage sampling module is connected with the charging module and is used for sampling voltages at two ends of the charging module; the signal comparison module is connected with the voltage sampling module and is used for receiving the voltage signal acquired by the voltage sampling module and then processing the signal; and the control module is connected with the circuit breaking module after receiving the signal output by the signal comparison module and passing through the RELAY module, and is used for detecting the state of the relay and controlling whether the RELAY module acts or not according to the state of the relay.

The invention discloses a silicon carbide epitaxial growth device. The epitaxial growth device comprises a gas supply system, the gas supply system comprises a front-end module and a rear-end module, the front-end module is used for accessing reaction gas, the output of the front-end module is connected with the rear-end module, and a gas path of the rear-end module is provided with a branch flow path matched and corresponding to at least one reaction gas type, the number of flow paths of each branch flow path is equal to the number of gas inlet cavities n of the multi-cavity spray head device, each gas path branch is provided with a pressure controller and (n-1) flow controllers, and the rear end module is used for adjusting reaction gas, carrier gas or protective gas before the multi-cavity spray head device is introduced. The flow of the gas path branches in the gas supply system is set and determined by the n-1 MFCs, and the gas flow of the path where the PC is mounted is equal to the difference between the total gas inlet flow of the front parts of the branches and the total flow of the branches where the MFCs are mounted, so that the problem that the total flow of the inlet does not accord with the total flow of the outlet is solved.