361 results about "Oxygen-free copper" patented technology

The invention discloses a multi-layer protection cable resistant to an extreme environment, and belongs to the technical field of cables. The cable is of a seven-layer composite structure design and sequentially comprises a conductor, an insulating layer, a shielding layer, a buffer layer, a waterproof layer, a heat insulation layer and a protective outer layer from inside to outside, and the conductor is made of high-purity oxygen-free copper; the insulating layer is made of a polyimide material and has high temperature resistance, low temperature resistance and excellent insulating property; the shielding layer is composed of a tinned copper wire woven mesh and a high-permeability permalloy foil, and electromagnetic interference is effectively shielded; the buffer layer is made of an elastic rubber material to relieve mechanical stress; the waterproof layer adopts a nanoscale fluorosilicone resin coating and has excellent waterproof performance; the heat insulation layer is made of ceramic fibers and aerogel, and efficient heat insulation is provided; and the protective outer layer is made of a high-strength and corrosion-resistant polyether-ether-ketone (PEEK) material. The cable has excellent high temperature resistance, low temperature resistance, corrosion resistance and electromagnetic interference resistance, is suitable for extreme environments, and ensures stable transmission of electric power and signals under extreme conditions.

According to the production method of the hot-rolled copper-steel double-metal composite plate, copper is oxygen-free copper, and Cu is larger than or equal to 99.95%; the steel is low-alloy high-strength steel; the key process steps of the copper-steel composite plate comprise assembling, heating, rolling, cooling and finishing. By controlling the rolling temperature, the pass reduction rate, the cooling speed and other processes, the plate shape of the copper-steel rolled composite plate is obviously improved, the stability of the bonding surface is greatly improved, and therefore industrial production and application of the copper-steel bimetal rolled composite plate are achieved.

The invention relates to the technical field of shovel tooth machines, and discloses a shovel tooth machining device for oxygen-free copper shovel tooth cooling fins, which mainly comprises a base, a workbench, an electric telescopic rod, a hydraulic telescopic rod, a shovel blade, a cooling device, an angle adjusting device, a circumferential adjusting device, a protective device and the like, the outer surface of the limiting shaft is rotationally sleeved with a gear, an inner gear ring is fixedly connected to the middle of the bottom face of the base, and clamping teeth are fixedly connected to the outer surface of the inner gear ring. When the direction of the oxygen-free copper block needs to be adjusted, an operator only needs to pull out the connecting rod and the limiting teeth through the pressing rod, then the base is rotated, the oxygen-free copper block on the vacuum suction cup base reaches the needed position, then the pressing rod is pressed, the pressing rod drives the connecting rod and the limiting teeth to move towards the gear ring, and then the oxygen-free copper block on the vacuum suction cup base can be adjusted. And the tooth ring is fixed and limited through cooperation of the limiting teeth and the clamping teeth, and through the design, tooth relieving machining of the oxygen-free copper block at any angle can be achieved.

The present invention relates to the technical field of superconducting materials. Disclosed are a MgB2 superconducting wire and a preparation method therefor. The preparation method comprises: melting Mg, Cu and Ti to obtain a Mg alloy ingot, processing the Mg alloy ingot to obtain a Mg alloy rod, loading the Mg alloy rod and B powder into a Nb tube to obtain a composite rod, processing the composite rod to obtain a single-core wire, loading the single-core wire into an oxygen-free copper tube, then loading into a monel tube in a densely-packed manner, and performing cold-forming treatment to obtain a multi-core composite wire; and performing high-temperature phase-forming heat treatment on the multi-core composite wire to prepare the MgB2 superconducting wire. In the present application, the Mg alloy rod containing Cu and Ti metal elements is used as a Mg source for preparing a MgB2 multi-core wire, so as to improve the plastic deformation ability of the Mg alloy rod in the wire treatment processes, and improve the grain boundary coupling, thereby improving the current carrying performance of the MgB2 superconducting wire.

The invention relates to the field of superconducting wire forming methods, in particular to a Nb3Sn superconducting wire preparation method based on multi-core wire liquid nitrogen cold drawing, and the Nb3Sn superconducting wire preparation method based on multi-core wire liquid nitrogen cold drawing comprises the following steps: preparing ultrahigh-tin-content copper-tin alloy powder by adopting a gas atomization method; the oxygen-free copper pipe, the oxygen-free copper rod and the pure niobium rod are machined, and the oxygen-free copper pipe and an oxygen-free copper bolt plug are obtained; acid pickling, cleaning and drying are carried out; uniformly fixing the pure niobium rods in the oxygen-free copper pipe to form a combined blank; performing rotary swaging to a required size, and then continuously drawing to obtain a finished wire; carrying out pulse treatment, and then carrying out air cooling to room temperature; and finally obtaining the Nb3Sn superconducting wire. According to the method, the strength and plasticity of the oxygen-free copper pipe sheath are improved through a liquid nitrogen cold drawing method, the combined blank is subjected to subzero treatment in the rotary swaging and drawing process, the plasticity of the combined blank is improved, and the high-strength and high-plasticity Ni3Sn superconducting wire can be obtained.

The invention discloses an oxygen-free copper alloy rod and a preparation method thereof, the alloy rod comprises an oxygen-free copper matrix, an element Cr, an element Zr and an element Ag, the content of the element Cu in the oxygen-free copper matrix is greater than or equal to 99.95 wt.%, the oxygen content is less than or equal to 5 ppm, the content of the element Cr is 0.1-0.3 wt.%, the content of the element Zr is 0.05-0.15 wt.%, and the content of the element Ag is 0.01-0.1 wt.%. The preparation process comprises the steps of vacuum melting, stirring, continuous casting and continuous rolling integrated machining and gradient aging treatment. According to the invention, the performance is synergistically improved through component optimization and process innovation, and the preparation process has uniqueness and unexpected technical effects, so that the defect that the strength and the conductivity cannot be balanced in the prior art is overcome. And the tensile strength is greater than or equal to 450Mpa while the electric conductivity is greater than or equal to 95% IACS.

The invention discloses a cross-linked polyethylene insulated fire-resistant flame-retardant power cable, relates to the technical field of power cables, and solves the problems that a power cable in the prior art is poor in sheath wear resistance, poor in flame retardant property and easy to degrade in insulating property. Comprising a cable core base layer, the cable core base layer comprises a conductor layer, the conductor layer comprises a plurality of conductors distributed in an extending mode, and each conductor is formed by twisting oxygen-free copper filaments; the insulating layer wraps the conductor layer, and the insulating layer is made of a cross-linked polyethylene material; the cable also comprises a shielding structure layer, the shielding structure layer comprises a conductor shielding layer and an insulation shielding layer, and the conductor shielding layer wraps each conductor and is used as an inner shielding layer. According to the design of the power cable, the XLPE power cable can work under the designed field intensity for a long time, and also has high reliability, low partial discharge and excellent fire-resistant and flame-retardant expansion capability, so that the stability of power transmission is ensured.

The invention discloses an ultraviolet-resistant and high-temperature-aging-resistant photovoltaic cable structure which comprises a cable conductor, and a buffer layer, an insulating layer, a shielding layer and a sheath layer which are sequentially arranged on the outer side of the cable conductor. The insulating layer is formed by co-extruding a heat-conducting buffer layer, a main insulating layer and a reflection isolating layer, and the heat-conducting buffer layer is provided with a heat-conducting channel along the axial direction; the shielding layer comprises a main body shielding layer and a thermal insulation layer. Silver-plated copper wires are embedded in the thermal insulation layer. Lotus-leaf-like bionic protrusions are arranged on the outer surface of the sheath layer, and a shape memory polymer film is embedded in the sheath layer. The cable conductor is made of high-purity oxygen-free copper and is spirally twisted, a ceramic composite coating is coated outside the cable conductor, and the buffer layer is a polytetrafluoroethylene film. According to the structure, through cooperation of multi-layer composite design and functional materials, the effects of rapid heat dissipation, improvement of temperature resistance and aging resistance, effective blocking of ultraviolet rays, enhancement of structural stability and the like are achieved, the problems that an existing photovoltaic cable is poor in weather resistance, insufficient in heat conduction and prone to structure failure are solved, and the photovoltaic cable can be widely applied to outdoor scenes such as photovoltaic power stations and the like.

The invention discloses a high-flexibility anti-interference fire-resistant cable for a robot and a preparation method thereof, and belongs to the technical field of wires and cables, the cable comprises an insulating wire core, the insulating wire core comprises a conductor, a shielding layer and an insulating layer, the conductor is formed by layering and twisting a plurality of anaerobic copper wires, tensile fibers are arranged in the middle of the conductor, the shielding layer is overlapped and lapped on the surface of the conductor, and the insulating layer is arranged in the shielding layer. A plurality of insulating wire cores and a filling layer are twisted into a cable, a composite belt is arranged on the outer side of the filling layer, the composite belt is made of glass fiber-aerogel, the overlapping rate is 15%-25%, and an inner shielding layer and an outer shielding layer are arranged on the outer side of the composite belt. And the outer side of the outer shielding layer is coated with a sheath layer. According to the invention, the composite belt can form a high-efficiency heat insulation layer in a fire hazard, and heat transfer to the wire core can be obviously delayed. The conductor is formed by stranding a plurality of oxygen-free copper wires in a layered manner, annealing is performed after stranding, and the aramid yarn is embedded in the conductor, so that the tensile stress to the metal conductor can be reduced, and the diameter of the conductor and the outer diameter of the whole cable are reduced while the conductivity and the transmission capability are maintained.

The invention belongs to the technical field of superconducting materials, and discloses an internal tin method Nb3Sn superconducting wire integrated with a piezoelectric sensing function and a preparation method of the internal tin method Nb3Sn superconducting wire. According to the method, a piezoelectric functional layer and a dielectric layer are prepared on the surface of a SnAl alloy rod, a CuAg alloy rod is installed after drilling to form a composite rod, the composite rod is inserted into an inner tin method Nb3Sn / CuNb composite pipe to be drawn into a subcomponent, then the subcomponent is bundled and installed into a Ta pipe and an oxygen-free copper pipe, and the wire is prepared through multiple times of stretching. The piezoelectric functional layer can convert micro strain into measurable electric signals, in-situ real-time monitoring of mechanical stress and the like in the wire rod is achieved, the CuAg alloy bar can stabilize the tensile strength of the wire rod and promote generation of an Nb3Sn phase, and on the premise that the superconducting performance is not affected, the operation reliability and safety of the high-field magnet under the extreme working condition are improved.

Solid powder and an organic carrier are matched according to the mass ratio of (82-86): (14-18), silver powder and titanium dihydride powder which form the solid powder are matched according to the mass ratio of 96: 4, and a solvent, a thickening agent and a dispersing agent which form the organic carrier are matched according to the mass ratio of (91-95): (2-6): (1-5). According to the Ag-Ti soldering paste, silver powder and titanium dihydride powder serve as solid phases and are matched with a specific organic carrier, by optimizing the rheological property and the vacuum brazing technology, TiH2 is decomposed to generate active Ti atoms, the active Ti atoms react with AlN ceramic to generate a continuous TiN reaction layer, and high-strength and low-defect connection of an AlN ceramic base material and an oxygen-free copper metal copper layer is achieved; a traditional Cu element is abandoned in a soldering paste system, generation of a brittle phase is avoided, and the reliability of a connector under the extreme working condition is improved; when applied to preparation of the ceramic copper-clad plate, the film has the advantages of strong silk-screen printing adaptability, uniform film thickness and low voidage.

The invention provides an oxygen-free copper sheet for a ceramic copper-clad plate, a preparation method of the oxygen-free copper sheet and the ceramic copper-clad plate, and the preparation method comprises the following steps: (1) melting and casting a copper plate raw material to obtain a cast ingot; (2) sequentially preheating and hot-rolling the cast ingot obtained in the step (1) to obtain a hot-rolled material; (3) the hot-rolled base material in the step (2) is roughly rolled, the deformation rate of each pass of rough rolling is controlled to be smaller than or equal to 30%, and a roughly-rolled material is obtained; (4) annealing the material subjected to rough rolling in the step (3) to obtain an annealed material; and (5) the annealed material in the step (4) is subjected to finish rolling, the deformation rate of each pass of finish rolling is controlled to be smaller than or equal to 35%, and the oxygen-free copper sheet for the ceramic copper-clad plate is obtained. The oxygen-free copper sheet for the ceramic copper-clad plate has excellent mechanical property and wide application prospect.

The utility model discloses a liquid nitrogen cooling high-power medium-voltage cable, which relates to the cable field, and comprises a power transmission core, a cooling pipe and a heat conduction filling strip, the power transmission core, the cooling pipe and the heat conduction filling strip are twisted to form a cable core, a soaking wrapping layer is wrapped outside the cable core, a polypropylene wrapping layer is wrapped outside the soaking wrapping layer, and the polypropylene wrapping layer is wrapped outside the polypropylene wrapping layer. And a high-density polyethylene sheath is wrapped outside the polypropylene wrapping layer. The conductors in the cable are made of oxygen-free copper materials, the outer diameter is smaller under the condition of the same conductor cross section, the structure is compact, the conductivity is excellent, and the transmission calorific value is small; circulating cooling of liquid nitrogen is achieved by arranging the liquid nitrogen pipe, heat in high-power operation of the cable can be rapidly taken away, and the current-carrying capacity of the cable is greatly improved. The cooling pipe is formed by interlocking and armoring a liquid nitrogen pipe and nickel steel, the strength is high, and the reliability of liquid nitrogen circulation is achieved; the heat conduction filling strips are arranged in the gaps between the cooling pipes and the power transmission cores, and the soaking wrapping layer is wrapped outside the cable core, so that the heat in the cable can be effectively homogenized, and the cooling efficiency is improved.

The invention relates to the technical field of copper material processing and manufacturing, in particular to a graphene copper composite material for transmission under high current density and a preparation method thereof.The method comprises the steps that cold isostatic pressing treatment is conducted on copper powder for in-situ growth of graphene, and a compressed blank is obtained; sintering the compressed blank to obtain a sintered blank; carrying out extrusion treatment on the sintered blank to obtain an extruded blank; the extrusion blank is subjected to a drawing process and annealing treatment, and the graphene copper composite material is obtained; the temperature rise of the obtained graphene copper composite material is at least 10% lower than that of oxygen-free copper under the large current density, the high-temperature conductivity is 3%-7% higher than that of TU0 oxygen-free copper, the temperature coefficient of resistance (TCR) is at least 3%-11% lower than that of pure copper, the heat conductivity coefficient reaches at least 440 W / (m.K), the conductivity is at least 105% IACS, the tensile strength is larger than or equal to 350 MPa, and the softening temperature is larger than or equal to 300 DEG C.

The invention discloses an accelerator neutron source solid-state lithium target cooling device, and relates to the technical field of accelerator neutron source medical application. An annular heat pipe is arranged on the outer ring of the side portion of an oxygen-free copper substrate, a plurality of liquid absorption cores are arranged on the inner wall of the heat pipe, and meanwhile an inner cavity of the heat pipe is filled with a working medium; when heat is generated, the heat is firstly transferred to the oxygen-free copper substrate, the evaporation section of the heat pipe is heated, the working medium in the wick is quickly evaporated and gasified, the generated steam flows to the condensation section under the driving of differential pressure and is condensed into liquid in the condensation section and releases heat, and the liquid generated by condensation returns to the evaporation section again under the capillary action of the wick. The space of the arranged heat pipe is large, and in the aspect of heat dissipation, the working medium is subjected to gas-liquid phase change in the heat pipe under the action of the liquid absorption core, so that the accelerator is rapidly dissipated, heat on the solid target material film can be rapidly taken away, and the cooling effect on the accelerator is greatly improved.

This invention discloses a conveniently detachable, actively water-cooled solid-state deuterium target based on a compact neutron source, comprising a micron-sized solid titanium film, a titanium film carrier, and a water-cooled substrate. Deuterium is deposited in the solid titanium film by bombarding it with a deuterium ion beam, and neutrons are generated by collisions with the subsequent deuterium ion beam. Oxygen-free copper, with its high thermal conductivity, is used as the carrier for the titanium film. The threaded structure on the side of the titanium film carrier allows for convenient installation and removal from the water-cooled substrate. The oxygen-free copper substrate, with multiple annular water-cooling structures inside, enables rapid and effective removal of heat flux from the target, preventing deuterium particles deposited in the solid titanium film from desorbing due to excessive temperature, thus avoiding impact on neutron yield. This invention provides a conveniently detachable, actively water-cooled solid-state deuterium target suitable for compact deuterium-deuterium neutron generators, providing a sound technical foundation for the widespread application of compact accelerator neutron source systems in production and daily life.

The invention discloses a preparation method for preparing oxygen-free copper through efficient impurity removal of recycled copper, which comprises the following steps: heating and melting the recycled copper to obtain a recycled copper melt, and determining the content of copper element by adopting spectral analysis; oxygen is continuously introduced into the regenerated copper melt, impurity removal agent powder is weighed according to the content of impurity elements and sprayed into the furnace together with the oxygen to react with impurities in the melt, and the regenerated copper melt subjected to impurity removal is obtained; continuously introducing natural gas melt into the regenerated copper melt subjected to impurity removal, weighing deoxidant powder according to oxygen content in the natural gas melt, and spraying the deoxidant powder into the furnace by using the natural gas to react with oxygen in the melt, so as to obtain a regenerated copper melt subjected to oxygen removal; and standing the deoxidized regenerated copper melt, removing scum in the melt, and casting to obtain an oxygen-free copper product. According to the method, the impurity removal agent and the deoxidant powder are used in a combined mode, the time needed by oxygen impurity removal and natural gas reduction is shortened, the quality of the molten copper is improved, consumption of production materials is reduced, the production efficiency is improved, the production cost and pollution to the atmospheric environment are reduced, and the method is suitable for large-scale application.

The invention relates to the technical field of radiation detection, and discloses a double-wire proportional counter tube and a signal processing method thereof. The double-wire proportional counter tube comprises a cavity made of TU2 oxygen-free copper, two 50 [mu] m gold-plated tungsten wires are arranged in the cavity in parallel to serve as anode wires, the distance between the wires is 1.8 cm, and the anode wires are led out through ceramic insulation terminals. And P10 gas is filled in the cavity. And the signal processing module comprises a pre-amplification circuit, a coincidence circuit, a main amplification circuit and a data acquisition unit, and is used for carrying out coincidence processing on the two paths of anode signals and screening effective signals. The signal processing method comprises the steps of gas ionization, electron avalanche amplification and signal synchronous judgment and recording. The ray measuring device integrates the counting tube, a gas path system and a data acquisition system, background noise is reduced through a coincidence circuit, and an energy spectrum analysis module can be selected to distinguish alpha rays and beta rays. The invention has the advantages of simple structure, high sensitivity, low background noise and the like.

This invention relates to a pre-fabricated tritium target based on a polycrystalline film and its manufacturing method, belonging to the field of plasma technology. The pre-fabricated tritium target includes an oxygen-free copper target substrate, a first zirconium film, a high-entropy ceramic tritium-blocking layer, and a second zirconium film sequentially deposited on its surface. The manufacturing method includes: pre-treating the oxygen-free copper target substrate; sequentially depositing multiple layers of films using a magnetron sputtering process to form a polycrystalline film layer; purging the oxygen-free copper target substrate with the polycrystalline film layer with tritium; and bonding the oxygen-free copper target substrate to an oxygen-free copper target holder. The pre-fabricated tritium target based on a polycrystalline film of this invention solves the problem of balancing heat dissipation and tritium blocking performance in traditional processes, achieving a balance between heat dissipation and tritium blocking capabilities. This allows the prepared pre-fabricated tritium target to be reused, improving the utilization rate of the pre-fabricated tritium target and reducing the cost of using neutron tubes.

The invention relates to a continuous casting-continuous extrusion short-process forming process for a large-width copper plate strip, and belongs to the technical field of metal processing. The method comprises the following steps: preheating and drying high-purity cathode copper, melting in a smelting device, covering the surface of molten copper with charcoal and graphite flakes, carrying out on-line degassing, deoxidizing and stirring, upwards leading a copper rod by adopting a traction unit, and extruding between an extrusion wheel and a compaction wheel; a four-high rolling mill is used for rolling; cleaning and passivating the annealed copper plate strip, spraying a lanthanum (III)-containing silane-benzimidazole lubricant solution on the surface of the copper plate strip, and drying; slitting to obtain a large-width copper plate strip; the lanthanum (III)-silane-benzimidazole lubricant is prepared from vinyltriethoxysilane, deionized water, ethanol, benzimidazole and lanthanum nitrate hexahydrate (III), and the lanthanum (III)-silane-benzimidazole lubricant is prepared from the vinyltriethoxysilane, the deionized water, the ethanol, the benzimidazole and the lanthanum nitrate hexahydrate (III); the prepared copper plate strip is high in purity, low in oxygen content, high in conductivity and excellent in mechanical property, and the technical requirements of the high-end field for the high-purity high-conductivity oxygen-free copper plate strip are met.

The utility model discloses a photoelectric composite cable with a special structure, which belongs to the technical field of communication equipment, aims at solving the problems of limited transmission rate, limited transmission distance, limited bandwidth and limited application scene of a network cable, and comprises a flame-retardant outer sheath, a Kairaff fiber protection layer is arranged at the central position in the flame-retardant outer sheath, and a cable core is arranged in the flame-retardant outer sheath. The cable comprises a flame-retardant coating, a Kailaff fiber protective layer is arranged in the flame-retardant coating, fiber paste is arranged in the Kailaff fiber protective layer, an optical fiber core is installed in the fiber paste, PE insulating layers are arranged at the positions, close to the two sides, in the flame-retardant coating, and oxygen-free copper conductor power lines are installed in the two PE insulating layers. The photoelectric composite cable has the high-speed data transmission capability of the optical fiber and integrates the function of power transmission, the optical fiber core and the oxygen-free copper conductor power line adopt independent shielding layers, electromagnetic interference and optical fiber transmission loss are effectively reduced, the transmission performance of the photoelectric composite cable is improved, a relatively independent structure is kept, and introduction and connection during installation are facilitated.

The application relates to the technical field of electrical connection equipment, and discloses a high-current small bus plug-in box rotary plug, which is used to solve the problems that the structure of key conductive components is single, the setting space is cramped, the conductive temperature rises fast, and the components are prone to aging in the prior art. The application is characterized in that the space of the regular octagonal flame-retardant PC shell and the insulating partition plate is optimized, the T2 oxygen-free copper Z-shaped large-section pin array is symmetrically arranged, the uniform contact pressure guaranteed by the spring assembly is matched, the conductive cross-sectional area is 2-3 times higher than that of the traditional reed structure, the galvanic corrosion of dissimilar metals is effectively avoided, the current-carrying capacity and the current transmission stability are greatly improved, the multidirectional heat exchange channels formed by the regular octagonal included angle, the pin array bending gap and the internal cavity are combined, the separation and heat dissipation of the insulating partition plate are combined, the cold and hot air efficient convection is realized, and the temperature rise of the key components is significantly reduced.

The invention discloses an electric contact material for a high-resistance circuit breaker and a preparation method of the electric contact material, and relates to the technical field of electric contact materials for circuit breakers, the material comprises the following components based on 100 parts by weight of the total weight of a finished product: 92.0-96.8 parts by weight of a pre-alloyed matrix phase which is Ag-30Ni pre-alloyed powder prepared by a gas atomization method; an in-situ carbon reinforcing phase: 1.0 to 2.0 parts by weight of a novolac resin powder as a carbon precursor; the three-phase functional layer phase is 0.1-5.0 parts by weight and is one of tungsten carbide and titanium carbide or a compound of tungsten carbide and titanium carbide according to the weight ratio of 1: 1; the copper infiltration filling phase is electrolytic copper powder or oxygen-free copper liquid; a multi-phase synergistic material system is constructed, all components are complementary, core performance such as arc resistance is balanced and optimized, and the problem that a traditional contact material is short in service life is solved; a precise preparation process chain is integrated, the structure and performance are directionally regulated and controlled, defects are reduced, the anti-loss capacity is improved, the strict requirements of a high-resistance circuit breaker are met, and the service cycle is prolonged.

The utility model discloses a system for prolonging the service life of a hard X-ray beryllium window, which is characterized by comprising a heating device and a two-dimensional moving device, the heating device is used for being connected with a beryllium window flange of a beryllium window, and the beryllium window flange is heated, so that water vapor in air is prevented from being attached to the surface of the beryllium window. The two-dimensional moving device is used for being connected with a vacuum pipeline where the beryllium window flange is located, the beryllium window flange is driven to move by moving the vacuum pipeline on a two-dimensional plane, and the incidence position of X rays on the beryllium window is adjusted. According to the utility model, the heating tape is wound outside the beryllium window flange, so that the adhesion of water vapor in the air on the beryllium window flange can be effectively slowed down, and the corrosion to oxygen-free copper / beryllium materials on the flange is reduced; a moving table in the XZ two-dimensional direction is installed at the bottom of the beryllium window flange, the flange is moved regularly to prevent one point of the beryllium piece from being irradiated by hard X-rays for a long time, and the service life of the beryllium piece can be effectively prolonged.

The invention relates to the field of transformers, in particular to a wide-voltage self-adaptive 24-pulse rectifier transformer for electrolytic hydrogen production, which comprises a voltage regulating transformer and two 12-pulse rectifier transformers integrated in a transformer box. The input end of the voltage regulating transformer is connected with a power grid, and the output end of the voltage regulating transformer is connected with the input ends of the two rectifier transformers through a multi-gear on-load tap-changer, so that wide-range rapid voltage regulation is realized. The two rectifier transformers are connected through a winding with a specific phase difference, and outputs of the two rectifier transformers are superposed to form a 24-pulse rectification waveform, so that harmonic waves on the power grid side are effectively suppressed. The iron core adopts a high-permeability silicon steel sheet and a full-inclined seam structure, the coil adopts a high-quality oxygen-free copper wire and is wound in a K-type transposition mode, and an interlayer heat dissipation oil way and an external air cooling system are matched, so that loss is reduced, and heat dissipation is optimized. The three transformer bodies are rigidly connected through the clamping pieces, and synchronous lifting installation can be achieved. The device has the advantages of low harmonic wave, high efficiency, wide-voltage self-adaption, good heat dissipation, convenience in installation and the like, and is suitable for a large-scale electrolytic hydrogen production system.

The invention provides a high-strength collision-resistant cable and a preparation method thereof. The high-strength collision-resistant cable comprises an oxygen-free copper conductor, a modified insulating layer, a multifunctional buffer layer, a high-strength armor layer and a wear-resistant outer sheath which are sequentially arranged from inside to outside, the invention relates to a preparation method of an anti-aging agent. The high-strength collision-resistant cable is prepared from the following raw materials: 35 to 45 parts of modified crosslinked polyethylene, 12 to 18 parts of polyisobutene grafted maleic anhydride-nano boron nitride compound, 8 to 15 parts of modified high-performance polypropylene-graphene quantum dot compound, 3 to 6 parts of nano titanium dioxide, 7 to 12 parts of aramid staple fiber, 5 to 10 parts of melamine cyanurate and 0.8 to 1.5 parts of calcium stearate. 0.5 to 1.0 part of a silane coupling agent, 6 to 10 parts of polycaprolactone and 0.3 to 0.8 part of an antioxidant. The obtained cable has excellent comprehensive performance of high strength, impact resistance, insulation, flame retardance and weather resistance.

The invention discloses a large-size copper-steel dense cavity component and a high-sealing-reliability brazing manufacturing method of the large-size copper-steel dense cavity component. A cylindrical surface fitting and crossed brazing filler metal groove structure is designed on a component structure, a brazing filler metal presetting mode is that foil brazing filler metal is fixed on a stainless steel side wall surface, and a brazing wire is placed in an oxygen-free copper side wall brazing filler metal groove, so that the defect of large and small surrounding caused by large-area side wall surface brazing filler metal joint filling is effectively overcome, and the side wall sealing reliability is improved. Through the stepped solder groove blocking and sealing structure, the problem of sealing of the side walls of multiple cavities on the cylindrical surface with the same diameter is effectively solved, and the sealing efficiency is improved. The temperature of a workpiece in a furnace is monitored, uniform temperature rise of a large-size component is achieved in cooperation with a stepped uniform temperature control mode, the synchronous melting, seam filling, solidification and diffusion processes of brazing filler metal in different areas of the component are achieved, and the probability of generation of brazing seam defects is reduced. Therefore, the technical problem of high-reliability sealing of circumferential welds among large-size dense multiple cavities is solved, and high-sealing welding among copper / steel dense cavities is ensured.

The invention discloses a method for preparing an internal tin method Nb3Sn superconducting material by using a sol-gel method, which comprises the following steps: preparing Nb / Sn gel by using the sol-gel method, and drying and pre-sintering the Nb / Sn gel to obtain Nb / Sn / O mixed powder; uniformly mixing the Nb / Sn / O mixed powder with Sn powder and Y powder to obtain Nb / Sn / O / Sn / Y mixed powder; loading the Nb / Sn / O / Sn / Y mixed powder into a barrier tube, and then loading the barrier tube into an oxygen-free copper tube to obtain a component; the components are densely arranged and loaded into an oxygen-free copper sheath, gaps are filled with oxygen-free copper rods in an inserted mode, and an Nb / Sn / O / Cu / Y composite ingot is obtained; and adding copper covers at the two ends of the Nb / Sn / O / Cu / Y composite ingot, and performing vacuum electron beam seal welding, extrusion and multi-pass drawing to obtain the Nb3Sn superconducting material. According to the prepared Nb3Sn superconducting material, the grain size of the Nb3Sn superconducting phase is smaller, and the structure is more stable.

The utility model provides a low-temperature-resistant winding dragging cable, which relates to the technical field of wires and cables and comprises an outer insulating sleeve, conductors distributed in an annular array are arranged inside the outer insulating sleeve, an inner insulating layer is fixedly sleeved outside the conductors, and a moisture-proof layer is fixedly sleeved inside the outer insulating sleeve. By adopting the combination of various adaptive materials such as the outer insulating sleeve made of fluoroplastic and the inner insulating layer made of silicon rubber, the cable can work normally in an extremely low-temperature environment of lower than-40 DEG C, maintains stable electrical insulation and protection performance and the like, and can be used for protecting the cable under the action of external force such as frequent dragging and bending and the like. By means of good flexibility guaranteed by the oxygen-free copper multi-strand stranded conductor, stability of reasonable structure matching of all layers and external protection provided by the thickened sheath, the problems of internal structure damage, conductor breakage and the like can be avoided, it is ensured that the overall performance of the cable is reliable, and the cable can better adapt to low-temperature complex application scenes needing winding and dragging.

The utility model belongs to the technical field of oxygen-free copper rod production, and particularly relates to a cleaning device for oxygen-free copper rod production, which comprises a cleaning device body, a water storage tank and a drain pipe, the water storage tank and the drain pipe are arranged on the cleaning device body, and one side of the cleaning device body is fixedly connected with a box body. A first rotating groove communicating with the outside is formed in the box body, a rotating block is rotationally connected into the first rotating groove, and a through groove is formed in the rotating block; the rotating assembly is located in the box body and used for driving the rotating block to rotate; the cleaning device for the oxygen-free copper rod solves the problems that after a user uses a cleaning device to clean the oxygen-free copper rod, waste water generated in cleaning can be collected in a waste water tank, the waste water tank is used for cleaning the oxygen-free copper rod, the waste water tank is used for cleaning the oxygen-free copper rod, and the waste water tank is used for cleaning the oxygen-free copper rod. And the water is discharged to the outside through a water discharging pipe, so that the water resource waste is caused.