166results about How to "Reduce burnout" patented technology

The invention provides a semiconductor structure and a manufacturing method thereof, belonging to the technical field of semiconductors. The structure comprises a substrate and one or more layers of interconnection structures, wherein the top layer of interconnection structure comprises a plurality of bottom metal wires, a plurality of contact plugs, an interlayer dielectric layer, a top metal wire, a metal fuse and an insulating layer. The metal fuse comprises a cathode, an anode and a fusing region, wherein the cathode is arranged on at least one residual contact plug, the anode is arranged on at least one residual contact plug, the contact plug below the cathode and the contact plug below the anode are arranged at different bottom metal wires, and the fusing region is respectively connected with the cathode and the anode. The semiconductor structure and the manufacturing method thereof disclosed by the invention are simple; through the manufacturing method disclosed by the invention, the thickness of the manufactured fuse by is easier to control and is thinner, thus the fuse can be fused by using low-energy laser or current.

The invention discloses a display panel and a display device, which relates to the technical field of display. The display panel comprises a step routing area. The display panel comprises an array substrate and a color film substrate that are arranged facing each other, wherein the array substrate comprises a first substrate and a signal routing arranged at one side, facing the color film substrate, of the first substrate, at least part of the signal routing is located at the step routing area, the color film substrate comprises a second substrate where a laser cutting area is arranged, and orthographic projection of the laser cutting area on a plane of the first substrate is within an area delimited by the step routing area; and a laser barrier layer, located in the non-display area, is arranged between the signal routing and the second substrate, wherein at least part of orthographic projection of the laser barrier layer on a plane of the second substrate is located in the laser cutting area, and orthographic projection of the laser barrier layer on the plane of the first substrate at least covers a part of orthographic projection in the signal routing that is located in the laser cutting area. By introducing the laser barrier layer the damage to the signal routing during a laser cutting is avoided.

The invention discloses an unmanned aerial vehicle cooperative system for forest protection. The unmanned aerial vehicle cooperative system comprises a main unmanned aerial vehicle body, an auxiliary unmanned aerial vehicle body and a fixed base station; the main unmanned aerial vehicle body comprises a central processing unit and comprises an aerial photographing system, a main flight control system, a main flame sensor, a main smoke sensor, a main positioning and navigation system and a main wireless communication module which are connected with the central processing unit; the auxiliary unmanned aerial vehicle body comprises a microprocessor and comprises an auxiliary flight control system, an auxiliary flame sensor, an auxiliary smoke sensor, an auxiliary positioning and navigation system and an auxiliary wireless communication module which are connected with the microprocessor; the fixed base station comprises a data receiving and transmitting module, a data processing module, a data storage module and a remote control module. The main unmanned aerial vehicle body and the auxiliary unmanned aerial vehicle body are used in cooperation, the auxiliary unmanned aerial vehicle body is used for fast high-altitude polling, the main unmanned aerial vehicle body is used for low-altitude confirmation and aerial photographing when a possible fire is found, informing a fire-fighting center in time and sending the real-time fire conditions, the fire-fighting efficiency is greatly improved, and burning of forest sources is reduced.

The present invention discloses a kind of automatic guiding device for till-less seeder of ridge cultivated corn, and belongs to the field of farm mechanical technology. The technological scheme includes a frame, a suspending point on tractor, a guide body connected to the frame through shaft, hydraulic cylinder and hydraulic rod, several angular displacement sensors, a control unit and a detecting fork on the frame, signal input wires connecting the angular displacement sensors to the control unit, hydraulic valve connected to the control unit and the hydraulic cylinder. Under the action of the hydraulic cylinder, the guide body can rotate around the shaft. The automatic guiding device is used in correct the forward direction of farm machine from time to time.

The invention discloses a production process of active lime. The process comprises the following steps of (1) screening and pretreatment of limestone, (2) mixing, (3) preheating, (4) calcining, (5) cooling and (6) post-treatment. Firstly, an additive used in the production process reduces underfiring and overburning of the lime, increases the decomposition speed of CaCO3, shortens the calcining time, correspondingly reduces the energy consumption and is beneficial to industrial popularization. Furthermore, carbon is also added, decompression operation is adopted after preheating and before cooling separately, correspondingly the elements sulfur and carbon which remain in lime raw materials can be volatilized out more thoroughly, and the recombination of the elements with calcium oxide is avoided, so that the purity of the active lime is improved, and the activity degree of quicklime is further improved.

The invention relates to a fusion agent for the smelting of magnesium alloy containing rare earth yttrium and a preparation method thereof, belongs to the technical field of metal material metallurgy and aims to solve the technical problems of large ignition loss and poor purification effect of the rare earth yttrium when the fusion agent is used for smelting the magnesium alloy containing the rare earth yttrium. The invention provides the fusion agent for the smelting of the magnesium alloy containing the rare earth yttrium. The fusion agent contains the following components in percentage byweight: 25-35 percent of magnesium chloride, 30-40 percent of potassium chloride, 8-16 percent of sodium chloride, 10-15 percent of magnesium fluoride, 0.1-0.3 percent of beryllium oxide and 4-10 percent of carbonate. The invention also provides a preparation method of the fusion agent, which comprises the following steps of: mixing and drying the magnesium chloride, the potassium chloride, the sodium chloride, the magnesium fluoride and the beryllium oxide and adding the carbonate to prepare the fusion agent. The fusion agent has the advantages of reasonable composition, high rare earth yttrium yield and good refining effect. The method has the advantages of simple and convenient production process and low cost.

The invention discloses a large-power-density compact-type motor for a mining blower fan, and the motor comprises a stator, a rotor, and a cooling device. The stator comprises a base and a stator core with a winding. The rotor comprises a shaft and a cage rotor. The cooling device comprises a ventilating duct, an internal fan, and an external fan. The base comprises a base cylinder, and the outer wall of the base cylinder is provided with ventilation channels. The ventilation channels are communicated with the inner cavity of the base cylinder through ventilation holes I. The outer wall of the base cylinder is alternately provided with radiating ribs and radiation tubes in the peripheral direction in a uniform manner, and the radiation tubes are communicated with the inner cavity of the base cylinder through ventilation holes II. According to the invention, the whole series employs an IC411 housekeeping fin cooling mode, thereby achieving the strict control of the stator current density, rotor current density, end ring current density, current multiple and torque multiple. The motor employs a bearing structure which can bear a bigger axial force and a radial force at the same time, and the oil injection and drain pipes are designed reasonably. The motor meets the requirements of the load characteristics of the mining blower fan, so as to solve problems of motor overtemperature, bearing damages, and oil inject and drain difficulties.

The invention belongs to the technical field of surface treatment of a part, and relates to a compressed air microporous stirring device for a surface treatment tank liquor, comprising an air inlet pipe, an air equalizing pipe, a microporous stirring pipe and a compressed air source; wherein the compressed air source communicates with the microporous stirring pipe through the air inlet pipe and the air equalizing pipe in sequence; the microporous stirring pipe is a PE polymer polyethylene microporous tube containing micron-sized pores. The invention provides a compressed air micropore stirringdevice for the surface treatment tank liquor, which has the advantages of constant tank liquor temperature, uniform concentration, good consistency between an anodized film layer and a plating layerfor surface treatment of parts and ability of preventing the heat of parts from being burnt effectively.

The invention provides a high-efficiency low temperature plasma generator. The high-efficiency low temperature plasma generator is characterized in that discharge electrodes are fixed in a metal framework through an electrode supporting plate; the discharge electrodes include a plurality of high voltage discharge electrodes and low voltage discharge electrodes; the high voltage discharge electrodes and the low voltage discharge electrodes are arranged in a intersected and parallel way; the high voltage discharge electrodes are connected with a high voltage electrode connection board; the low voltage discharge electrodes are connected with a low voltage electrode connection board; the high voltage electrode connection board is connected with a high voltage terminal; and each discharge electrode includes a dielectric tube and a metal electrode tube. The high-efficiency low temperature plasma generator can realize high anticorrosion performance of the generator and achieve maximization of the discharge efficiency through reasonable structural layout and material selection.

A high-temperature heating clamping experiment device for fuel bundles of a pressurized water reactor comprises 3*3 bundles of the reactor, wherein the bundles are arranged in a high-temperature smelting furnace and clamped and fixed by two high-temperature rhenium-molybdenum electrodes at upper and lower ends, and each rhenium-molybdenum electrode comprises a first electrode chuck, a second electrode chuck and a rhenium-molybdenum plate; the first electrode chuck and the second electrode chuck which are mutually matched are arranged at one end of each rhenium-molybdenum plate; a semicirculargroove is formed in each first electrode chuck and each second electrode chuck, and each first electrode chuck and each second electrode chuck are mounted together and matched to form a round hole toclamp a conductive cap at the top end of each fuel bundle. During an experiment, when a molten material drips to the electrodes, all that is required is to replace the first electrode chucks and the second electrode chucks instead of replacing the rhenium-molybdenum plates, so that loss caused by damage is reduced greatly, and the problems of high cost and high loss caused by replacement of rhenium-molybdenum electrodes due to electrode damage in the prior art are solved.

The invention discloses a liquid flow frame of an all-vanadium redox flow battery. The liquid flow frame comprises a hollow frame body, the frame body is symmetrically provided with a liquid inlet flow channel and a liquid outlet flow channel, and the liquid inlet flow channel comprises a liquid inlet main flow channel body, a liquid inlet first-grade buffer flow channel body, a liquid inlet first-grade branch flow channel body, a liquid inlet second-grade branch flow channel body and a liquid inlet second-grade branch flow channel body which are communicated in sequence; the liquid outlet flow channel comprises a liquid outlet main flow channel body, a liquid outlet first-grade buffer flow channel body, a liquid outlet first-grade branch flow channel body, a liquid outlet second-grade branch flow channel body and a liquid outlet second-grade branch flow channel body which are communicated in sequence; the liquid inlet first-grade branch flow channel body and the liquid outlet first-grade branch flow channel body are both evenly provided with multiple parallelogram protrusions for forming inclined electrolyte flow channels, and the liquid inlet second-grade branch flow channel bodyand the liquid outlet second-grade branch flow channel body are both evenly provided with rectangular protrusions for forming electrolyte flow channels. An electrolyte can be more evenly and uniformly distributed in the middle of the liquid flow frame, which helps to improve the energy efficiency of the vanadium battery and the current efficiency.

The invention discloses a process method for preparing active calcium oxide by oxygen-enriched calcination. The process method the following steps of firstly crushing and sieving raw limestone to enable the particle size of the raw limestone to be 10-55 mm, conveying the raw limestone into a stock bin with a circular cross section, wherein the stock bin is arranged at an upper part of a vertical preheater; then, uniformly conveying the raw materials in the stock bin into the vertical preheater through a blanking pipe, and preheating the raw materials by using high-temperature kiln gas and cooling gas of a vertical cooler; then, feeding the materials into a rotary kiln, and importing oxygen-enriched air from a kiln head to perform oxygen-enriched calcination; and then, feeding the calcium oxide obtained after calcination and decomposition into the vertical cooler to be cooled by air, namely, obtaining the active calcium oxide. According to the process method disclosed by the invention,through the integration of the processes of graded preheating, oxygen-enriched calcination, graded cooling, dynamic temperature monitoring and the like, and the raw materials are preheated by combining the high-temperature kiln gas and the high-temperature gas discharged from the cooler, the heat transfer efficiency of the system is greatly improved, the activity of calcium oxide is obviously improved, the energy consumption is reduced, and the energy conservation and emission reduction are realized.

The invention relates to an electrostatic protection circuit applied to a depth sensor, and the depth sensor. The electrostatic protection circuit is connected between an input / output bonding pad andan internal circuit of the depth sensor; the input / output bonding pad is used for receiving or outputting a signal; the internal circuit receives or outputs a signal through the input / output bonding pad; and the electrostatic protection circuit comprises a first-stage electrostatic leakage circuit connected between the input / output bonding pad and the grounding end and used for discharging the electrostatic current generated by the input / output bonding pad to the grounding end when the input / output bonding pad suffers from electrostatic attack, a current limiting circuit connected between thefirst-stage electrostatic leakage circuit and the internal circuit and used for performing current limiting on the electrostatic current, and a second-stage electrostatic leakage circuit connected between the current limiting circuit and the internal circuit and used for performing secondary discharging on the electrostatic current which flows through the current limiting circuit. By virtue of setting of the two-stage electrostatic leakage circuits in the scheme, the internal circuit of the depth sensor is protected effectively; and the circuit is simple in structure, low in cost and high in reliability.

The invention discloses sanitary ware repairing glaze and a preparation method thereof, the sanitary ware repairing glaze comprises the following raw materials by weight percentage: 10-20% of low-melting-point glass powder, 15-30% of spodumene, 50-74% of surface glaze and 0.3-0.8% of nano La2O3, wherein the initial melting temperature of the low-melting-point glass powder is 400-530 DEG C. The sanitary ware repairing glaze has the advantages of high color consistency before and after repair, good thermal stability of the repair position, improvement of the repair superior rate, low re-burningtemperature, and solving of the problems of mismatching of the repair position and the main body color, and high proportion of burnt and deformed products after re-burning. According to the preparation method of the sanitary ware repairing glaze, the prepared sanitary ware repairing glaze mud and sanitary ware repairing glaze slip cannot crack due to rapid drying, the bonding property with a sanitary ware main body is good, no crack exists at the bonding boundary, and the problems that the repairing position or boundary is prone to drying and cracking, and the repairing effect is poor are solved.

The invention provides an improved upper cover oil separation structure for a compressor, comprising an upper cover of the compressor and exhaust pipes, wherein, the top of the upper cover is provided with an exhaust hole. The structure is characterized in that the exhaust pipes comprise an upper exhaust pipe and a lower exhaust pipe, wherein, one end of the lower exhaust pipe is connected with the exhaust hole by the inner wall surface of the top of the upper cover, the other end is communicated with the interior of the compressor, and the lower exhaust pipe is provided with an unflatness inner wall surface; an oil separator is arranged on the outer edge of the outer wall surface of the top of the upper cover of the compressor, and the top of the oil separator is communicated with the upper exhaust pipe; when cooling media carrying lubricating oil passes through the exhaust pipes, the action of the lower exhaust pipe of the unflatness inner wall surface and the oil separator causes the lubricating oil in the cooling media to be separated to be returned into the compressor, thereby realizing the effects of effectively reducing the oil output of the compressor, prolonging the service life of the compressor, improving the heat exchange performance of an air conditioner and saving the running cost of the air conditioner.

A laser welding method for an automobile skylight guide rail comprises the following steps of (1), designing a tool coordinate system, (2), fixing workpieces, (3), starting mechanical arm demonstration, (4), placing a height standard block, (5), lowering power at corners of the workpieces, (6), setting parameters, and (7), carrying out welding. According to the method, the surface appearance of weld joint can be controlled precisely, the burning loss phenomenon at the corners of the workpieces can be reduced, the weld joint is even and attractive after welding, secondary machining is not needed, and the welding method is simple and easy to achieve.

The invention relates to a motorcycle headlamp, and belongs to the technical field of motorcycle assembling. The motorcycle headlamp comprises a lamp shell, a lampshade and a light-emitting assembly. The light-emitting assembly comprises a headlamp body arranged in the middle of the lamp shell and at least one reflective strip located above the headlamp body and in a transparent shape. The head end and the tail end of each reflective strip are connected with the inner side wall of the lamp shell, and LED lamps are arranged at the head ends of all the reflective strips. Each reflective strip is made of composite materials and comprises, by weight, 30-70 parts of polymethyl methacrylate, 15-30 parts of acrylonitrile-butadiene-styrene terpolymer, 1-3 parts of surface organic modification nano-silicon dioxide, 5-10 parts of ultra-fine alumina oxide particles, 5-10 parts of glass fiber, 5-10 parts of compatilizers, 3-5 parts of fire retardants, 1-3 parts of ultraviolet light absorbers and 1-3 parts of antioxidants. The motorcycle headlamp is attractive and beautiful in overall modelling, reasonable in layout, long in service life, high in safety performance and wide in universality.

One or more embodiments of the invention provide a protection accessory of an outdoor power distribution cabinet. The protection accessory comprises a base, wherein a mounting cavity is formed in thebase; a sliding seat is mounted in the mounting cavity; a plurality of propping plates are mounted on the peripheral side of the sliding seat; the propping plates are connected with a buffer spring;the buffer spring is fixedly mounted on the inner wall of the mounting cavity; an accommodating cavity is formed in the sliding seat; an extrusion table is arranged in the accommodating cavity; a cabinet body is fixedly connected to the upper part of the sliding seat; and a guide sleeve is arranged on the bottom wall of the cabinet body, the guide sleeve penetrates through the containing cavity and the interior of the cabinet body, a contact rod is installed in the guide sleeve, the contact rod is sleeved with an extrusion spring, the upper end of the contact rod extends into the cabinet body,a pressing plate is arranged at the top of the contact rod, and a power-off switch and an alarm switch are arranged below the pressing plate. The power distribution cabinet is powered off and gives an alarm before being subjected to inevitable severe impact, and the burnout risk of the power distribution cabinet is reduced.

The invention discloses an anti-fatigue traditional Chinese medicine effective component composition as well as a preparation method and application thereof, and belongs to the field of traditional Chinese medicines. The traditional Chinese medicine composition takes effective components extracted from donkey-hide glue, codonopsis pilosula, milkvetch root, lily, root of kirilow rhodiola and all-grass of desertliving cistanche as main components of the medicine, is prepared into appropriate dosage forms, and is relatively good in curative effect of resisting fatigue. Moreover, the anti-fatigue composition disclosed by the invention does not have any toxic or side effects, and does not show effects of mutagenesis and teratogenesis after being taken by animals for a long time. Therefore, the anti-fatigue composition disclosed by the invention is safe and effective, and is suitable for taking for a long time by fatigable people suffering from fast-paced work and overstrain nerves, and high-end people including middle-aged and aged people and the like.

The invention discloses a water quality monitoring and regulating system. The water quality monitoring and regulating system comprises: a filtering subsystem composed of a main filtering pipeline and two branched filtering pipelines, and a near-end control terminal, wherein a water inlet end of the main filtering pipeline is connected with a municipal water source through a pipeline; a water outlet end of the main filtering pipeline is divided into two paths which are connected with the water inlet ends of the two branched filtering pipelines respectively; after being combined, the water outlet ends of the two branched filtering pipelines are configured into a water outlet of the filtering subsystem; the near-end control terminal comprises a main controller, two water quality detection modules for detecting water quality information of the branched filtering pipelines, two flow regulating assemblies for regulating water outlet amount of the branched filtering pipelines, and a water quality detection module for detecting water quality information of the water outlet of the filtering subsystem; the water quality detection module and the flow regulating assemblies are connected with the main controller respectively. By detecting a plurality of parameters including a solubility total solid value, a pH (Potential of Hydrogen) value, a temperature value and the like of water quality, the water quality can be automatically regulated according to the parameters and requirements on different water quality of different people can be met.

The invention discloses a high-voltage explosion-proof three-phase asynchronous motor for a coal mine belt conveyor. The high-voltage explosion-proof three-phase asynchronous motor comprises a stator, a roller and a cooling device, wherein the stator comprises an engine base and a winding stator core arranged in the engine base; the rotor comprises a shaft and a squirrel cage rotor arranged on the shaft; one end of the shaft extends out of the engine base to form a shaft extension end and the other end is located in an end cover of the engine base to form a non-shaft extension end; the shaft extension end and the non-shaft extension end are supported in the stator through an end cover assembly separately; the cooling device comprises an air duct, an inner fan and an outer fan; the air duct and the inner fan are located in the engine base and fixed on the shaft; the air duct is communicated with the inner fan; and the outer fan is located in the end cover and fixed on the non-shaft extension end of the shaft. The high-voltage explosion-proof three-phase asynchronous motor for the coal mine belt conveyor can meet the load characteristic requirement of the coal mine belt conveyor, so that the quality problems such as long starting time of the motor, a high temperature rise of the motor, falling or melting of a rotor end ring, slot wedge falling and stator burn-out are solved, the overall performance of the motor is improved and the service life is prolonged.

The invention relates to an outdoor integrated power distribution room for power system. The outdoor integrated power distribution room comprises a hollow cavity which is arranged under the ground, wherein an integrated power distribution room is arranged in the hollow cavity; the outdoor integrated power distribution room is characterized in that a damp-proof layer is arranged on the outer surface of the integrated power distribution room; a low-voltage power distribution room and a high-voltage power distribution room are arranged in the integrated power distribution room; the low-voltage power distribution room is separated from the high-voltage power distribution room through a firewall; the firewall is provided with a safety door; the damp-proof layer comprises an epoxy resin layer located on an inner layer; polyvinyl chloride resin layers are arranged at two sides of the epoxy resin layer; and a damp-proof vapor isolation membrane is arranged at the outer side of each polyvinyl chloride resin layer.

The invention relates to the technical field of metallurgy and mineral engineering, and discloses a whole-grade powdery iron ore magnetizing and roasting process based on three tandem rotary kilns. The whole-grade powdery iron ore magnetizing and roasting process comprises the following steps: grading iron ore granularities, screening powdery iron ores to obtain iron ores with the granularities of 0-1 mm, 1-5 mm and 5-15 mm, initially magnetizing and roasting the iron ores with the granularity of 5-15 mm, magnetizing and roasting the iron ores with the granularities of 1-5 mm and 5-15 mm after mixing, magnetizing and roasting the whole-grade iron ores after mixing, cooling reduced and roasted iron ores, and grinding and magnetically separating after decreasing the temperature of a magnetized and roasted iron ore mixed material to be not greater than 200 DEG C so as to obtain fine iron powder with the grade of 56-60% and the metal recovery rate of 85-90%. By means of the whole-grade powdery iron ore magnetizing and roasting process disclosed by the invention, magnetization without ring formation of the powdery iron ores in three continuous reduction rotary kilns without open fire is realized; various grades of iron ores are reduced sufficiently; the roasting quality is uniform; and the phenomenon that large granular iron ores are underburnt and small granular iron ores are overburnt can be effectively reduced.

The invention discloses a garbage furnace with a vortex arch and a heat island, which aims at providing a garbage furnace which can ensure the staying time of the flue gas in a combustion chamber to be prolonged, the flue gas to be adequately mixed and burnt, the secondary pollution to be avoided, and simultaneously the height of the furnace body and the manufacturing cost to be reduced. The garbage furnace comprises a reciprocating furnace body, a vortex arch (12) with a vortex hole (11) is arranged between the throat opening of a front arch (10) and a rear arch (14) of a hearth, a combustion chamber (3) is arranged at the upper part of the vortex arch (12), a cracking chamber (13) is arranged at the lower part, and the combustion chamber (3) is mutually communicated with the cracking chamber (13) through the vortex hole (11); a reciprocating grate (15) with the head supplying air is arranged at the lower part of the cracking chamber (13); a heat island (4) is arranged at the upper part of the rear arch (14) in the combustion chamber (3), and a multilevel and multi-row vortex secondary air system distributed in the tangential direction of a secondary air main pipe (5) is arranged in the heat island (4); the garbage furnace is applied to the domestic garbage disposal, and the generated heat can be applied to the power generation, the heating and other industrial gas.

A portable communication device, according to various embodiments of the present disclosure, may include: a battery pack; a power dissipation element disposed outside the battery pack; a detecting circuit configured to detect the state of the battery pack; and at least one of first switches that are connected to the battery pack and the detecting circuit, wherein the detecting circuit is configured to control at least one of the first switches to: electrically disconnect the power dissipation element from the battery pack when the state of the battery pack does not satisfy a specified condition; and electrically connect the power dissipation element to the battery pack when the state of the battery pack satisfies the specified condition.

The invention discloses a protection method for reducing alternating current motor insulation bearing burning. An alternating current motor comprises a bearing seat, a bearing and a rotor. The bearing is installed on the bearing seat, and the bearing and the rotor are sleeved on a motor shaft. The method includes that an insulation protection structure is arranged between the bearing seat and the bearing and between the bearing seat and the rotor respectively. The method achieves a remarkable effect of reducing burning of the insulation bearing for supporting a motor shaft system and caused by shaft voltage, and has the functions of reducing alternating current motor bearing fault rate and ensuring motor and device safety in the fields of rail transit and the like.

The invention discloses a fireproof power fuse capable of conveniently replacing a fuse wire. The fireproof power fuse comprises a shell, power connection pipes and fuse wires, wherein the two ends ofthe shell are both fixedly connected with the power connection pipes which are horizontally distributed, the inner sides of the two sets of power connection pipes are fixedly connected with power connection blocks which are communicated with the shell, the inner side of the shell is rotatably connected with a rotary disc, and the inner side of the rotary disc is provided with the four sets of fuse wires which are distributed in an annular array mode. According to the present invention, a rotary disc type wire changing structure is adopted, so that convenient replacement of a fuse wire can berealized, the workload of an operator is reduced, and fuse wire replacement convenience is improved so as to facilitate the actual operation and use of the power fuse; and the fuse wire can be coveredand extinguished when the temperature of the fuse wire is abnormal or open fire is generated due to the adoption of the covering type fire extinguishing structure, so that the burning phenomenon of the fuse is reduced so as to improve the use safety of the power fuse wire.

The invention discloses a semiconductor cooling and heating composite device and a preparation method and application thereof. According to the semiconductor cooling and heating composite device, a slotted hole is formed in the bottom plate, so that the slotted hole is not connected with the cover plate and the first groove, the isolation of heating in the slotted hole and cooling in the first groove is realized, and the cooling efficiency is greatly improved; according to the preparation method of the semiconductor cooling and heating composite device, vacuum diffusion welding is conducted onthe cover plate and the first bottom plate, no air leakage phenomenon exists after welding, then vacuum brazing is adopted for welding the second bottom plate, fixing of the heating wire can be ensured, the situation that the heating wire is burnt out is reduced, and the semiconductor cooling and heating composite device has wide application prospects in the field of semiconductors.

The invention relates to high-magnesium cold-working mould steel. The high-magnesium cold-working mould steel is composed of, by weight, 1.40-1.60% of C, 0.30-0.50% of Si, 0.30-0.50% of Mn, 11.0-13.0% of Cr, 0.80% of V, 0.70-1.20% of Mo, 0.4-0.7% of Ni, 0.06-0.08% of Mg, and the balance Fe and inevitable impurities. Grains of the prepared high-magnesium cold-working mould steel are refined, network carbide is reduced, and the properties of abrasion resistance, plasticity, tenacity, fatigue life and the like are improved on the condition of reducing the cost.