276 results about "Pulse magnetic field" patented technology

The invention discloses an SERF atom magnetometer double-axis magnetic field detection method and device based on pulsed magnetic field modulation, relates to the technical field of magnetic field precision measurement, and compresses the action time of a modulation magnetic field additionally applied in the same unit period on a hot atom ensemble by replacing conventional continuous sinusoidal magnetic field modulation with pulsed magnetic field modulation. The pulse magnetic field with the duty ratio of d can reduce the spin exchange relaxation rate to 2d times of that of a conventional method under the same modulation amplitude and frequency, due to the fact that the spin exchange relaxation rate is effectively restrained, the collected polarizability response signal is obviously improved, and the polarizability response signal can be obtained through the pulse magnetic field with the duty ratio of d and the pulse magnetic field with the duty ratio of d. Low-relaxation-rate sensitivity-enhanced double-axis magnetic field measurement under a pulse modulation scheme is realized, the double-axis measurement sensitivity of a miniaturized SERF atom magnetometer is further improved, and the method has great significance in supporting leap-type development of a future array type extremely-weak magnetic imaging system and medical application thereof.

The invention relates to the technical field of magnetic material preparation and heat treatment, in particular to a heat treatment process window widening method for a high-magnetic-conductivity nanocrystalline strip, which comprises the following steps of: by gradient component design and pulsed magnetic field coupling heat treatment, enabling the initial magnetic conductivity of the strip to exceed 22,000 and widening the heat treatment temperature interval to 400-600 DEG C; the alloy comprises 73.5% of Fe, 1% of Cu, 3% of Nb, 13.5% of Si, 8.5% of B and 0.5% of Co, during heat treatment, the temperature is increased to 450 DEG C at the speed of 15 DEG C / min, a 0.8 T pulsed magnetic field is applied for heat preservation, then the temperature is increased to 550 DEG C for heat preservation, alpha-Fe (Si) nanocrystalline and Co-B amorphous interface phases are generated through crystallization, and Co is distributed in a solid solution mode. The method widens the heat treatment temperature interval, improves the initial magnetic conductivity of the strip, improves the toughness, meets automatic production, and reduces the cost by using the existing equipment; and the prepared strip is high in magnetic conductivity, good in stability, suitable for various scenes and good in economic benefit and social benefit.

The invention belongs to the technical field of integrated die casting, and relates to an integrated die casting forming method and system based on multi-magnetic-field coupling. The method comprises the steps that S1, metal raw materials are subjected to smelting, degassing modification and deslagging standing, and a metal melt is obtained; s2, in the inert gas environment, electromagnetic stirring is conducted on the metal melt; s3, the mold is subjected to mold heating, heat preservation and pressure maintaining, vacuumizing and release agent spraying; s4, the metal melt is pressed into a mold cavity for mold filling and solidification, a coupling magnetic field is applied to the metal melt, and an integrated die casting is obtained; wherein the coupling magnetic field covers a mold cavity and is used for improving the flowability of a metal melt during mold filling, inhibiting turbulent flow and refining the structure of the metal melt after solidification; the coupling magnetic field comprises a direct-current magnetic field and a pulsed magnetic field, the direct-current magnetic field penetrates through the metal melt from bottom to top, and the pulsed magnetic field penetrates through the metal melt from the side of the mold cavity. By means of the method, the high-quality integrated die casting can be manufactured.

The invention provides a permanent magnet magnetizing control method based on magnetic domain dynamics and a magnetizer, and particularly relates to the technical field of permanent magnet magnetizing. Obtaining a three-dimensional model of the permanent magnet to be magnetized, and dividing the three-dimensional model into a plurality of magnetic domain units; obtaining a magnetic moment kinetic equation of each magnetic domain unit; magnetic moment directions of the magnetic domain units are randomly distributed when magnetizing is not carried out, the magnetic moments of the magnetic domains do spin precession under the action of an effective magnetic field, and the magnetic moment directions approach to the direction of the effective magnetic field; the magnetic moment direction of each magnetic domain unit at different moments is subjected to numerical solution, and the change track of the magnetic moment direction of the magnetic domain unit from the initial magnetic moment direction is determined according to the instantaneous magnetic moment direction of the magnetic domain unit at different moments; and determining the consistency degree of the magnetic moment direction of each magnetic domain unit according to the change track, and generating a relation graph of the magnetizing saturation, the pulse magnetic field intensity and the pulse duration. According to the method, the magnetizing precision and efficiency can be improved.

The invention discloses an IC21 single-crystal high-temperature alloy diffusion welding method based on multi-field assistance and a high-entropy interlayer, and belongs to the technical field of welding. Nano high-entropy intermediate layer foil composed of 35% of Ni, 22% of Cr, 20% of Al, 7% of Re, 5% of Ta, 2% of Y, 7.5% of Si and 1.5% of B is adopted and placed between an upper layer IC21 single-crystal high-temperature alloy and a lower layer IC21 single-crystal high-temperature alloy, liquid-phase diffusion welding is conducted in a vacuum diffusion welding furnace by introducing the multi-field coupling effect of an ultrasonic vibration field, a pulsed magnetic field and an electric field, energy field superposition is achieved through multi-field coupling through space-time cooperation, and the high-temperature alloy is obtained. The pulse frequency of the ultrasonic vibration field is matched with the alternating frequency of the magnetic field; a diffusion channel is opened by an electric field, dendritic crystal regulation and defect repair are realized by mid-term superposition of an ultrasonic vibration field and a pulsed magnetic field, finally directional migration and dendritic crystal segregation suppression of a liquid film are realized, the technical bottleneck of high-integrity connection of an ultrathin-wall structure of a single-crystal turbine blade is broken through, and the extreme working condition service requirement of a sixth-generation engine is met.

The invention provides a 60NiTi alloy high-purity preparation and rolling forming method. The 60NiTi alloy high-purity preparation and rolling forming method comprises the steps that firstly, raw material treatment is conducted, wherein the surface of a raw material is cleaned; step 2, vacuum induction suspension smelting; step 3, annealing treatment; step 4, pretreatment before rolling; fifthly, rolling forming is carried out; and sixthly, the sheath is removed, specifically, the sheath is cut off through an angle grinder, and the internal 60NiTi alloy plate is obtained. According to the method, a low-C-content high-quality cast ingot is prepared through a vacuum suspension smelting process of vacuum-pulsed magnetic field composite degassing, and a rolling forming process is adjusted according to the millisecond-level rapid precipitation characteristic of a Ni4Ti3 phase in the alloy and the metal flowing behavior in the plastic forming process; the problems that in the alloy rapid forming process, hard phase rapid precipitation and recrystallization are difficult are solved, the defects of non-uniform crystal grains, transverse cracks, longitudinal cracks and crocodile opening type cracks in the rolling process are avoided, and the 60NiTi alloy rolled plate uniform in microstructure and excellent in comprehensive performance is obtained.

The invention provides a secondary battery and a manufacturing method thereof, a battery device, an energy storage device and a power utilization device, which are at least beneficial to improving the performance of the secondary battery. The manufacturing method comprises the steps that magnetic composite filler comprising an ionic conductor core is prepared, the surface of the ionic conductor core is sequentially coated with a magnetic functional layer and a protective layer, the magnetic functional layer is made of a magnetic material, and the protective layer is made of an oxide; preparing a polymerization precursor comprising the magnetic composite filler, a polymer matrix, an initiator, a lithium salt and a solvent; coating the polymeric precursor under a pulsed magnetic field to form a film, so that the magnetic composite filler is directionally arranged along the thickness direction of a film layer; initiating the polymerization precursor to generate polymerization reaction, so that the polymerization precursor is cured and molded into a solid electrolyte membrane; a positive plate and a negative plate are provided, the positive plate, the solid electrolyte membrane and the negative plate are subjected to winding treatment or lamination treatment and then put into the shell, and an initial battery cell is formed.

The invention discloses an electromagnetic and hydraulic combined bulging and correcting method for a pipe plate. The method comprises the steps of 1, feeding treatment, 2, electromagnetic pre-activation treatment, 3, hydraulic precise bulging treatment, 4, pressure maintaining and shaping treatment, 5, electromagnetic and hydraulic collaborative correcting treatment and 6, material taking and post-treatment. The device comprises a machine frame which is vertically symmetrical and provided with a forming lower die and an opening and closing upper die through a hydraulic oil cylinder, a temperature sensor and a strain gauge are embedded in the lower side in a die cavity, high-frequency induction coils are arranged on the outer surfaces of the forming lower die and the opening and closing upper die, and a pulsed magnetic field generator is embedded in the top in the opening and closing upper die. A liquid injection opening is formed in the side edge of the upper opening and closing mold and is connected with a high-pressure oil pump through a pipeline; a main controller is further arranged on the rack; through a staged coupling process, the deformation resistance during bulging is reduced, elastic recovery is eliminated through cooperative shape correction, meanwhile, the device integrates multiple modules, real-time matching of electromagnetic parameters and hydraulic pressure is achieved, and the device adapts to forming of pipe plates made of different materials and in complex shapes.

The invention provides a copper alloy dual-wavelength laser synergistic pulsed magnetic field additive manufacturing device and method, and belongs to the field of additive manufacturing. The base is arranged right above the base plate and horizontally moves relative to the base plate; the blanking mechanism is arranged on the base and conveys powder materials to the base plate; the first laser is arranged on the base and emits blue laser towards the substrate; the second laser is arranged on the base and emits red laser towards the substrate; the blue laser irradiates the raw material and enables the powder material to form a molten pool on the substrate. The red laser irradiates the molten pool, inputs a heat source and expands the molten pool. According to the method, the irradiation starting time of the red and blue laser is designed, the power and the light spot area of the red and blue laser are adjusted, the molten pool formed by copper or copper alloy additive manufacturing can be finely regulated and controlled, and therefore the problems that in the additive manufacturing process, copper or copper alloy is low in forming efficiency and poor in compactness are solved.

The invention discloses a method for preparing fine-grain copper and copper alloy through pulsed magnetic field and rare earth adding composite regulation and control, and belongs to the technical field of copper and copper alloy material preparation. Graphite mold casting is adopted in the method, and the method comprises the specific steps that electrolytic copper with the purity larger than or equal to 99.95 wt% or a copper alloy with specific components is prepared as a matrix raw material; after smelting, adding pure lanthanum blocks and uniformly stirring; after the melt is poured into a preheating mold, a pulsed magnetic field is applied immediately for treatment, and the parameters of the magnetic field are as follows: the pulse voltage is 180-250 V, the frequency is 4.5-6.5 Hz, and the duration time is 15-20 minutes. According to the method, the heterogeneous nucleation effect of rare earth lanthanum is combined with the melt forced convection and dendritic crystal crushing effect caused by the pulsed magnetic field to synergistically refine a solidification structure and promote columnar crystal orientation equiaxed crystal transformation, so that a cast ingot with fine crystal grains is directly obtained in the casting stage, and the possibility is provided for simplifying the subsequent processing technology.

The invention discloses a result verification method for a transcranial magnetic stimulator calibration device, and relates to the technical field of medical equipment detection, and the method comprises the following steps: collecting pulse magnetic field parameters outputted by a TMS therapeutic instrument in real time through constructing a multipath parallel magnetic field distribution perception array composed of a plurality of coil type magnetic field sensors; designing a three-dimensional calibration platform to perform multi-dimensional dynamic calibration on the magnetic field distribution sensing array, calibrating the relationship between the induced electromotive force and the magnetic induction intensity of the sensor, and verifying whether the measurement error is less than + / -0.1% or not; and comparing the actually measured magnetic field data with the human brain magnetic field distribution data simulated by the finite element simulation model, analyzing the difference value between the simulation data and the actually measured data, and correcting the system according to the data deviation degree. According to the transcranial magnetic stimulator calibration device and the result verification method, real-time acquisition and high-precision calibration of dynamic parameters are realized through a multi-path synchronous magnetic field sensing array, and the calibration reliability is verified based on finite element simulation and actually measured data comparison.

The utility model discloses a pulsed magnetic field stimulator with a temperature protection function, and relates to the technical field of medical equipment. The pulse magnetic field stimulator comprises a shell, a pulse magnetic field stimulator body, a cooling cover, a liquid tank and a refrigeration assembly, the pulse magnetic field stimulator body is fixedly installed in the shell through a support, the cooling cover is arranged outside the pulse magnetic field stimulator body in a covering mode, and heat conduction silicone grease is arranged between the cooling cover and the pulse magnetic field stimulator body. A cooling cavity for cooling liquid circulation is formed in the cooling cover, and the liquid inlet end and the liquid outlet end of the cooling liquid cavity are communicated with a liquid conveying pipe and a liquid discharging pipe through connecting nozzles respectively. The situation that the device is overheated due to long-time work is avoided, and heat on the surface of the pulsed magnetic field stimulator body is taken away through circulation of the cooling liquid.

The present invention relates to the field of magnetic material preparation and heat treatment technology, specifically a method for widening the heat treatment process window of a high magnetic permeability nanocrystalline strip. By gradient composition design and pulsed magnetic field coupling heat treatment, the initial magnetic permeability of the strip exceeds 220,000 and the heat treatment temperature range is widened to 400°C-600°C; the alloy composition is Fe73.5%, Cu1%, Nb3%, Si13.5%, B8.5%, Co0.5%, and during heat treatment, the temperature is first raised to 450°C at 15°C / min and a 0.8T pulsed magnetic field is applied to keep the temperature, and then the temperature is raised to 550°C for keeping the temperature, crystallizing to generate α-Fe(Si) nanocrystals and Co-B amorphous interface phase, with Co distributed in the form of solid solution. This method widens the heat treatment temperature range, improves the initial magnetic permeability of the strip, improves toughness to meet automated production, and reduces costs using existing equipment; the prepared strip has high magnetic permeability and good stability, is suitable for a variety of scenarios, and has good economic and social benefits.

The invention discloses an embedded electromagnetic actuating array flexible robot system based on pulse driving and a preparation method of the embedded electromagnetic actuating array flexible robot system, and belongs to the technical field of flexible robots. The system comprises a flexible actuating body, a multi-channel pulse driving controller, a sensing unit and a processing unit. A conductive coil array capable of independently addressing is embedded in the body, and magnetic particles are dispersed in the material of the conductive coil array. The driving controller can output independent programmable pulse current to each coil, a pulsed magnetic field is excited around the coils, the magnetic field interacts with the magnetic particles, electromagnetic force and magnetic torque are generated in the flexible body, and therefore the body is driven to generate controllable deformation. The sensing unit monitors the deformation or stress state of the body in real time, the processing unit dynamically adjusts pulse parameters according to target deformation and sensing feedback, and precise closed-loop control is achieved. According to the system, a space-time division multiplexing strategy is adopted to coordinate multi-channel excitation, and magnetic field crosstalk is effectively inhibited; and efficient thermal management is realized through combination of a low-duty-ratio pulse working mode and a high-thermal-conductivity base material. The device has the advantages of being fast in deformation response, large in output force, high in programmable degree, accurate in control and the like, and has wide application prospects in the fields of soft robots, self-adaptive grippers, bionic motion platforms, medical instruments, man-machine interaction equipment and the like.

The invention discloses a cerebral cortex stimulation central nervous regulation system and method based on a pulse magnetic coil, and the system comprises a pulse magnetic stimulation module, a neural signal collection module, a central control module and a man-machine interaction module, and is additionally provided with a three-dimensional positioning module and a multi-level safety monitoring module. The pulse magnetic stimulation module generates a focused pulse magnetic field, the neural signal acquisition module acquires multi-brain-region electric signals, and the central control module dynamically regulates stimulation parameters after analyzing the signals to form closed-loop regulation; the three-dimensional positioning module ensures accurate positioning of the coil, the safety monitoring module monitors parameters in real time and triggers emergency protection, and the man-machine interaction module realizes convenient operation and data management. According to the method, adjustment is completed through initialization, signal acquisition and analysis, precise stimulation, positioning adjustment and safety monitoring. The scheme is non-invasive, accurate, safe and suitable for nerve research and disease treatment, the regulation effect and use safety are improved, and development of the nerve regulation technology is promoted.

The invention discloses a manufacturing process of a radial magnetic flux cylinder type motor iron core, and particularly relates to the technical field of motor iron core manufacturing, and the manufacturing process comprises the steps: employing magnetron sputtering to construct a gradient insulation coating on the surface of a nanocrystalline strip, and enabling the gradient insulation coating and silicon steel sheets to be alternately laminated to form a magnetic conduction-bearing composite structure; a yoke bionic honeycomb runner and a tooth magnetic barrier groove are machined through femtosecond laser, and magnetothermal coupling optimization is achieved; multidirectional progressive stamping forming is conducted in the pulsed magnetic field environment, and grain directional arrangement and interface metallurgical bonding are achieved in combination with femtosecond laser micro-connection; the integrated eddy current detection system regulates and controls press fitting parameters in real time, and stress regulation and control are completed through two-stage microwave annealing and ion beam treatment. According to the method, the magnetic circuit efficiency and the heat dissipation performance of the iron core are effectively improved, through material-structure-process collaborative innovation, the problems of magnetothermal imbalance, grain disorder, assembly accumulative errors and the like in traditional manufacturing are solved, and the operation stability and the service life reliability of the iron core under the high-frequency and high-load working condition are remarkably improved.

The invention relates to a material dynamic mechanical property testing technology, in particular to an impact mechanical loading device and method based on a locked-rotor test of an electromagnetic coil emitter, and the device comprises a pulse power supply module, an electromagnetic loading module, a constraint fixing module and a measurement and control system. Capacitor charging voltage is set through an upper computer, a control switch is switched on to discharge an electromagnetic loading module to generate pulse current, and an electromagnetic coil generates a pulse magnetic field to enable a conductor armature to induce eddy current to generate axial electromagnetic force; the position of the armature is rigidly restrained to form locked rotor, impact electromagnetic force is directly loaded to a sample through an impact head to form impact stress, and dynamic response, fatigue damage and aging accumulation experiments of materials are carried out by monitoring the working performance of a monitoring device such as voltage, current and impact force. The device has the advantages of being small in size, flexible and adjustable in impact stress wavelength and amplitude, high in efficiency and the like, and the problems that a traditional mechanical impact device is large in size, the impact stress pulse width is not easy to regulate and control, and the test efficiency is low are solved.

The invention provides an anti-browning device for fruit juice production. The end part of the vacuum constant-pressure magnetic field squeezing device is connected with a driving device fixed on the rack, the vacuum constant-pressure magnetic field squeezing device is fixedly connected with a power distribution cabinet and a feeding device, and the inner bottom end of the power distribution cabinet is fixedly connected with a vacuumizing device and a pulsed magnetic field generating device. Raw materials are fed through the feeding device, driven by the driving device and controlled through the power distribution cabinet, meanwhile, the interior of the vacuum constant-pressure magnetic field squeezing device is vacuumized through the vacuumizing device, and meanwhile, a pulsed magnetic field is generated in the vacuum constant-pressure magnetic field squeezing device through the pulsed magnetic field generating device; and meanwhile, the vacuum constant-pressure magnetic field squeezing device is used for keeping constant pressure, so that oxidative browning is inhibited in a vacuum low-oxygen environment, enzyme deactivation is performed through a pulsed magnetic field, and heat effect is reduced through constant-pressure squeezing, so that heat-sensitive browning can be remarkably reduced.

The invention relates to a neural function detection and regulation method and system for a magnetic stimulation coil, and the method comprises the steps: driving a capacitor through a control circuit to discharge to a dual-path stimulation coil, and generating a millisecond pulse magnetic field; utilizing the pulsed magnetic field to act on nervous tissue to generate a nerve regulation effect comprising suprathreshold stimulation and subthreshold stimulation; acquiring evoked potential signals generated by stimulation and induction of the pulsed magnetic field in real time; the evoked potential signal is analyzed, and the nerve conduction time and excitation inhibition ratio is calculated; according to the nerve conduction time and the excitement inhibition ratio, a double-path stimulation time sequence and / or a capacitor discharge parameter are / is adjusted, detection and cooperative regulation and control of the nerve function are carried out, and the purposes of real-time detection, quantitative evaluation and self-adaptive precise regulation and control of the nerve function are achieved.

The utility model belongs to the technical field of cranial magnetic stimulation devices, and particularly relates to an adjustable transcranial magnetic stimulation device, which comprises a pulsed magnetic field stimulator and an adjusting structure, the adjusting structure comprises a mounting plate fixed with a wall body, a connecting plate is fixedly mounted at the center of the mounting plate, an adjusting plate is mounted on the connecting plate through a bolt, and the adjusting plate is connected with the pulsed magnetic field stimulator. One end of the adjusting plate is rotatably connected with a folding rod, one end of the folding rod is rotatably connected with a connecting rod, one end of the connecting rod is rotatably connected with an adjusting seat, an embedding groove is formed in one position of the adjusting seat, an electric push rod is fixedly installed in the embedding groove, and one end of the electric push rod is fixedly connected with a moving rod. According to the utility model, the pulsed magnetic field stimulator can be accurately and flexibly aligned to the specific position of the head of a patient through the synergistic effect of each component in the adjusting structure, including the folding rod, the connecting rod, the electric push rod, the universal joint structure and the like, so as to adapt to individual differences and treatment requirements of different patients.

The invention is applicable to the field of metal material nondestructive testing, and provides a method for correcting wall thickness of a small block defect in pulsed eddy current testing, which comprises the following steps: starting a pulsed eddy current testing probe, and exciting a pulsed magnetic field by the probe to induce an eddy current field in a tested metal conductor; setting a detection step length, gradually scanning and detecting the defect direction of the detected metal conductor small block by a detection probe from a starting point, and automatically calculating and acquiring a wall thickness value at each detection point position; recording an initial change detection point and an end point change detection point of the wall thickness value obtained by scanning detection, calculating the distance DSE between the initial change detection point and the end point change detection point by combining the step length, and then calculating the defect size LDEF of a small block; and the minimum value h of the wall thickness values obtained through scanning detection is taken, and the actual wall thickness value h2 of the small block defect is calculated according to a correction formula. Through the correction method, the block defects smaller than the footprint size can be correctly evaluated, and serious consequences caused by wrong evaluation of small block serious defects are avoided.

The invention discloses a forming method suitable for a Laval type pipe, relates to the technical field of Laval type pipe machining and manufacturing, and innovatively combines two high-speed forming processes of electromagnetic forming and electro-hydraulic forming for Laval type pipe machining. Electromagnetic force can be utilized to realize rapid and uniform diameter shrinkage of the pipe, and damage caused by mechanical contact is avoided; according to the electro-hydraulic bulging, the pipe can be bulged according to a preset shape by accurately controlling the liquid pressure, and a good forming effect is achieved. The method is simple in experimental device, high in operability, high in energy utilization rate, high in forming speed and high in forming precision. In order to solve the technical problems existing in the production of the Laval type pipe, the forming characteristics of electromagnetic forming and electro-hydraulic forming are combined, a method of combining diameter shrinkage of a thin-wall pipe driven by pulsed magnetic field force and controllable bulging of electro-hydraulic forming impact force is provided, and efficient, accurate and low-cost machining of the Laval type pipe is achieved.

The invention discloses a vacuum horizontal continuous casting device for producing high-purity and high-density copper rods, and relates to the technical field of high-purity and high-density copper rod production, the vacuum horizontal continuous casting device comprises a box body assembly, a vacuum pump is installed on the outer wall of the box body assembly, and a quantitative assembly is installed at the top of the box body assembly; a filtering assembly, a smelting assembly and a heat preservation barrel are sequentially installed on the inner wall of the box assembly from right to left, and a third induction coil is installed on the outer wall of the heat preservation barrel. According to the vacuum horizontal continuous casting device, the electromagnetic stirrer, the first induction coil and the second induction coil are adopted, when the vacuum horizontal continuous casting device is used, multi-frequency heating can be conducted on copper materials in the crucible, the heating efficiency of the copper materials in the device is improved, and therefore the overall working efficiency is improved; the quantitative assembly, the electromagnet, the pulsed magnetic field generator and the filtering assembly are adopted, when the vacuum horizontal continuous casting device is used, impurities in molten copper can be removed, and the purity of copper raw materials is improved.

The invention discloses a double-tungsten-electrode arc welding system and method based on high-frequency controllable square waves, and belongs to the technical field of mechanical engineering and welding. The system comprises a high-frequency waveform editing module I and a high-frequency waveform editing module II which are connected with a TIG welding power source and a double-tungsten-electrode welding gun correspondingly, and electric arc cooperative control is achieved by independently regulating and controlling current waveforms. The method comprises the steps of surface pretreatment, current parameter configuration, switching of a high-frequency square wave mode after short-circuit arcing, and real-time monitoring of molten pool morphology optimization parameters. The method breaks through the limitation that traditional TIG welding is low in deposition efficiency and high in arc pressure, the arcs are contracted through the high-frequency pulse magnetic field, double-arc independent regulation and control and heat input optimization are achieved, the method is suitable for thin plate high-speed welding and thick plate large-current welding, and the problems of pits and undercut defects are solved. The method has the functions of waveform real-time editing and closed-loop feedback regulation and control, shows excellent process adaptability in the fields of aerospace, nuclear power and the like, and provides a novel welding path for precision manufacturing.

The invention discloses a multifunctional transcranial therapeutic apparatus and a control method thereof. The transcranial therapeutic apparatus relates to the field of medical equipment and solves the problem of single function of a traditional transcranial therapeutic apparatus. The transcranial electrical stimulation module can transmit direct current stimulation or alternating current stimulation; the transcranial magnetic stimulation module can provide a pulsed magnetic field; the ultrasonic stimulation module generates ultrasonic waves through an ultrasonic transducer. The multiple stimulation heads are used for being distributed in different areas of the head, an electrical stimulation electrode slice of the transcranial electrical stimulation module, a magnetic stimulation coil of the transcranial magnetic stimulation module and an ultrasonic transducer of the ultrasonic stimulation module are integrated in each stimulation head, and signal generators of all the modules are controlled in a unified mode through the main controller. A single stimulation mode or combined work of multiple stimulation modes is selected according to the illness state and treatment requirements of a patient, the different stimulation combination modes synergistically act on a target brain area, the treatment effect is improved, and the problems that a traditional transcranial therapeutic apparatus only supports a single stimulation mode and is poor in treatment effect are solved.

The invention discloses a static pressure forming process for a stainless steel marine pipeline. The performance of the pipeline is improved through material optimization and process innovation. The method comprises the following steps: selecting materials according to a service environment and carrying out cold rolling-annealing pretreatment: respectively carrying out 30%-40% cold rolling on 316L and 2205 dual-phase steel or N08367 corresponding to different working conditions, then carrying out protective atmosphere recrystallization annealing and water quenching at the temperature of more than or equal to 200 DEG C / s, and cooperating with pulse laser cleaning to retain a CrOfilm; in the forming stage, a silicon-based shear thickening fluid medium is adopted, segmented pressurization is matched with axial tension regulation, and the wall thickness deviation is smaller than or equal to 0.1 mm. And optimizing the 2205 steel phase proportion through subsequent pulsed magnetic field annealing. Electrochemical polishing Ra < = 0.15 mu m and a graphene coating are adopted for surface finishing, so that the fluid resistance is reduced, and the salt mist service life is 3 times that of a traditional process. According to the technology, through the synergistic effect of fluid dynamic response and magnetic field regulation and control, the problems that a traditional formed wall is uneven in thickness, insufficient in corrosion resistance and the like are solved.

The invention discloses a preparation method for rare earth permanent magnet single-piece forming, and belongs to the technical field of rare earth permanent magnet preparation. Comprising the following steps that 1, raw material powder is prepared, specifically, rare earth alloy is smelted and then condensed into sheets, then fine powder is obtained through a hydrogen explosion crushing technology, an antioxidant and a grain refiner are added, and the raw material powder is obtained through uniform mixing; 2, single-sheet mold orientation pressing, wherein the single-sheet mold with a nanometer coating is used for conducting two-step pressing on the raw material powder under the pulsed magnetic field; step 3, sintering and post-processing: sintering the material obtained by pressing in the step 2 in stages, and then applying an auxiliary magnetic field for cooling; the invention specifically focuses on an innovative method for preparing a high-performance rare earth permanent magnet by means of a single-piece forming process. The method has remarkable advantages and wide applicability in the aspect of efficient and low-cost production of permanent magnets such as neodymium iron boron and samarium cobalt.

The utility model relates to the technical field of blasting, and discloses an open blasting cannon-avoiding device which comprises a cannon-avoiding shed, an observation window is embedded in the other outer wall of the cannon-avoiding shed, a liquid storage cavity is formed in the inner end of the side wall, close to the observation window, of the cannon-avoiding shed, and containing cavities are formed in the positions, located on the two sides of the liquid storage cavity, of the side wall of the cannon-avoiding shed. A permanent magnet is arranged at the inner end of the containing cavity, a hinged reinforcing rib penetrating into the containing cavity is slidably clamped in the liquid storage cavity, magnetic coils are arranged on the inner cavity wall of the containing cavity, and a pulsed magnetic field generator connected with the magnetic coils is installed at the included angle in the gun avoiding shed. The pulsed magnetic field generator can quickly drive the magnetic coil to generate a magnetic field, so that the magnetorheological fluid in the liquid storage cavity is solidified within millisecond time to form a rigid buffer layer, and high-strength shock waves are effectively resisted; and collapse caused by insufficient rigidity of a traditional structure is avoided.

The invention discloses a pulsed high-intensity magnetic field generation device and method. The device comprises a vacuum chamber; the spiral backflow assembly is located in the vacuum cavity and comprises a conductive bottom plate, a conductive top plate located over the conductive bottom plate and a plurality of conductive spiral rods, a first through hole is formed in the conductive bottom plate, one end of each conductive spiral rod is connected to the conductive bottom plate, and the other end of each conductive spiral rod is connected to the conductive top plate; the plurality of conductive screw rods are uniformly distributed in the circumferential direction around the axis of the first through hole and have the same spiral direction; the plasma generating assembly comprises a first conductive block penetrating through the first through hole and not making contact with the bottom plate, a second conductive block located over the first conductive block and connected with the conductive top plate and a plurality of micron-sized conductive wires, one ends of the micron-sized conductive wires are connected to the first conductive block, and the other ends of the micron-sized conductive wires are connected to the second conductive block; the plurality of micron-sized conductive wires are uniformly distributed in the circumferential direction around the axis of the first through hole; the positive electrode of the pulse current source is electrically connected to the conductive bottom plate, and the negative electrode is electrically connected to the first conductive block. The invention aims to generate pulsed magnetic field intensity by using a simple device structure.

The present invention belongs to the technical field of precision electrospark machining, and specifically relates to a magnetorheological fluid dynamic compensation electrospark machining system and method. The machining system includes: an electrospark machine bed, a drive motor, an electrode spindle, a pulse electromagnet integrated electrode structure, an auxiliary pulse electromagnet, a controller, a fixture, a workbench, and a magnetorheological fluid circulation system. The present invention uses pulsed magnetic field control to form a solid-state conductive structure of the magnetorheological fluid, establishes a controllable discharge gap in the discharge stage, and utilizes the breakdown of a silicone oil-based carrier medium to achieve non-contact discharge machining; in the intermittent stage of the magnetic field, the magnetorheological fluid restores its liquid properties, and synchronously achieves efficient discharge of erosion products, active cooling of the machining area, and micro-abrasive assisted surface finishing through directional flow. This method combines the coordinated control of magnetic field intensity and pulse timing to achieve dynamic reconstruction and compensation of the conductive structure, effectively solving the problem of electrode loss compensation.