1868 results about "Magnetic tension force" patented technology

A structure of a rotor changeable of a magnetic force is provided, which includes a rotor core and a plurality of magnetic pole parts disposed therein. Each magnetic pole part includes a radially-magnetized fixed magnetic-force magnet and a circumferentially-magnetized variable magnetic-force magnet. A cavity part is disposed between the fixed magnetic-force magnet and the variable magnetic-force magnet. The cavity part has a cross-section extending from an end part of the fixed magnetic-force magnet toward an opposing surface. The cavity part is formed so that a distance between the variable magnetic-force magnet and the cavity part in the circumferential direction becomes larger as the cavity part approaches the opposing surface, and a width of the cavity part in the circumferential direction becomes smaller as the cavity part separates from the fixed magnetic-force magnet in the radial direction.

The invention discloses a magnetic adjustment water lubricated bearing and a bearing support control method, which are applied to a large ship propulsion shaft system, and comprise a bearing shell, an electromagnetic excitation module, a batten, a sensor module, a power supply driving module and a control system, a plurality of mounting grooves are formed in the bearing shell; an electromagnetic excitation module is arranged in each mounting groove and generates a variable magnetic field with set intensity; a plurality of magnetically soft alloy segments are arranged on the batten, the magnetically soft alloy segments correspond to the electromagnetic excitation modules one to one, and a magnetic field acts on the magnetically soft alloy segments to generate electromagnetic attraction force; the control system independently controls the excitation current of each electromagnetic excitation module according to data of the sensor module, and generates magnetic fields with different intensities to act on soft magnetic alloy areas at corresponding positions, so that precise control of local supporting rigidity and lubricating gaps of the water-lubricated bearing is realized, unbalance loading and abnormal wear risks are effectively reduced, and the service life of the water-lubricated bearing is prolonged. And the adaptive capacity of the bearing under low-speed heavy load and dynamic disturbance is improved.

The invention relates to the technical field of magnetic separation, in particular to a magnetic gradient separation fire metal material evidence screening machine and a multistage magnetic field regulation and control method thereof.The magnetic gradient separation fire metal material evidence screening machine comprises a machine body, a feeding pipe and rotating cylinders are rotationally connected to an inner cavity of the machine body, magnetic separation assemblies are installed between the feeding pipe and the rotating cylinders and between the two rotating cylinders, and driven gears are installed on the outer walls of the feeding pipe and the rotating cylinders; according to the multi-stage magnetic separation device, the multi-stage magnetic separation design is adopted, magnetic force sequentially increased from top to bottom of the magnetic separation assembly is combined with centrifugal force generated by rotation of the feeding pipe and the rotating cylinders, and materials are evenly dispersed and make full contact with the magnetic separation assembly; meanwhile, the valve plate assemblies are sequentially opened in the descending process of the abutting blocks, so that the materials sequentially fall down layer by layer, sorting disorder caused by falling of a large number of materials at a time is avoided, the materials can be kept for enough time on each magnetic separation assembly, it is ensured that metal material evidences with different magnetisms are fully adsorbed, and the screening accuracy is greatly improved.

The invention belongs to the technical field of wind tunnel test devices, and particularly provides a supporting frame for a wind tunnel test and a wind tunnel. The supporting frame for the wind tunnel test comprises a frame body, supporting assemblies and air floating plates, the frame body is provided with a translation track and moving columns, each moving column is provided with the corresponding supporting assembly, the air floating plates are arranged between two magnetic adjusting plates, and every two opposite air floating plates are used for being connected with a segment model. According to the invention, simultaneous installation and test of a plurality of bridge segment models are supported, and the distance between adjacent segment models can be adjusted by changing the position of the moving column. The air floating block is communicated with an air source, so that the air floating plate and the segment model are suspended in the wind tunnel, the rigidity of the system can be changed by changing the magnitude of magnetic force between the magnetic force adjusting plate and the magnetic force suspension plate, the vibration amplitude of the segment model is further changed, parameter adjustment is more flexible, the adjustment range is wider, and operation is more convenient. And the requirements of the number, the spacing and the system rigidity of the segment models under different conditions during the test can be met.

The invention relates to the technical field of medical instruments, and discloses an interventional instrument delivery rotating device and conveying system.The interventional instrument delivery rotating device comprises a transmission mechanism, a delivery mechanism and a translation driving component, the transmission mechanism comprises a rotation driving component and a translation driving component, and the delivery mechanism is arranged at the top of the transmission mechanism; the delivery mechanism comprises a delivery driving wheel and a delivery driven wheel, the delivery driving wheel is matched with the rotary driving part and drives the delivery driving wheel to rotate through magnetic force so as to achieve synchronous rotation, and the translation driving part is used for driving the delivery driven wheel to move; compared with the prior art, through non-contact transmission of magnetic coupling, the driving side and the execution side are completely isolated, a pollution path is cut off from the physical structure, and the infection risk is greatly reduced.

The invention provides an internal flow field balancing device for a magnetic transmission high-temperature and high-pressure closed container. Comprising a pulley, a transmission mechanism, a clutch, a turbulent flow mechanism, a frequency modulation motor and a magnetic transmission mechanism, a rotating cage is arranged on the pulley and is driven to rotate through a rotating mechanism; a tray is hung on the rotating cage, and an accommodating object is accommodated on the tray; the transmission mechanism is arranged at the closed end of the tank body; one end of the clutch is connected with the transmission mechanism; the turbulence mechanism is provided with a transmission shaft, blades and a driving gear are arranged at the extension end of the transmission shaft, the blades are used for adjusting airflow distribution in the tank body, and the driving gear is connected with the input end of the transmission mechanism and used for driving the transmission mechanism; the magnetic transmission mechanism is a non-contact coupling for transmitting torque through magnetic field force, is arranged in the middle of the outer side of the sealing head at the closed end of the tank body and transmits torque to the closed space of the tank body; the frequency modulation motor is connected with the magnetic transmission mechanism and used for driving the transmission shaft to rotate. Three flow field balancing modes are provided for use.

A closure device includes a first magnet and a housing with a second magnet positioned therein. The first magnet is configured to be position in a first object and the housing is configured to be positioned in a second object. The housing has a top end and at least one adjustment mechanism connected to the housing that moves the second magnet in at least one translational direction or at least one rotational direction relative to the top end of the housing. The movement of the second magnet relative to the top end of the housing adjusts the position or orientation of the second magnet relative to the first magnet to alter a magnetic force between the first magnet and the second magnet when the first magnet is positioned proximate the top end of the housing.

The invention provides a 90-degree Halbach array-based magnetic coupler for a reaction kettle, which comprises a sealing cover cylinder, an outer magnet support sleeve is rotatably connected to the outer side of the sealing cover cylinder, a plurality of outer magnets are arranged on the outer magnet support sleeve, an inner magnet support sleeve is rotatably connected to the inner part of the sealing cover cylinder, and a plurality of outer magnets are arranged on the inner magnet support sleeve. A plurality of outer magnets are arranged on the outer magnet supporting sleeve, a plurality of inner magnets are arranged on the inner magnet supporting sleeve, the outer magnets and the inner magnets are arranged according to a 90-degree Halbach array, the outer magnets are arrayed according to the fact that the magnetic induction intensity of the inner sides of the outer magnets is enhanced by the 90-degree Halbach array, and the inner magnets are arrayed according to the fact that the magnetic induction intensity of the outer sides of the inner magnets is enhanced by the 90-degree Halbach array. The invention further provides an optimal design method of the magnetic coupler, and an optimal design combination is found by adopting a multi-target parameterization optimal design method. The invention solves the technical problems of low magnetic field intensity between air gaps, low magnetic steel utilization rate, low maximum transmission torque and low design and development method efficiency of the existing magnetic coupler, and belongs to the technical field of magnetic drive reaction kettles.

A hair cutting device with an adjustable blade assembly is provided. A mounting bracket captures at least a portion of a blade assembly and blade bracket extends around the mounting bracket and is adjustable to change the position of the mounting bracket. A magnet is positioned within the mounting bracket to provide a magnetic force between the mounting bracket and the blade bracket. The magnetic force provides a smooth and consistent movement of the mounting bracket relative to the blade bracket and / or blade assembly.

The invention provides a giant magnetostrictive bar multi-physics field coupling dynamic characteristic monitoring system. The giant magnetostrictive bar multi-physics field coupling dynamic characteristic monitoring system comprises a magnetic field loading module, a mechanical loading module, a thermal environment control module, a signal detection module and a signal processing module. The magnetic field loading module generates a broadband superimposed magnetic field through a direct-current bias coil and an alternating-current driving coil; the mechanical loading module applies prestress by adopting a hydraulic device; the thermal environment control module accurately controls the temperature within the range of-50 DEG C to 300 DEG C. The signal detection module is integrated with a B measuring coil, an H measuring coil, a laser displacement sensor, a pressure sensor and an acoustic emission sensor to realize high-speed synchronous acquisition of multi-physical field parameters; and the signal processing module transmits the data to the upper computer in real time based on the data acquisition card for recording and analysis. According to the system, a magnetic-force-thermal coupling excitation environment is constructed, the magnetostriction coefficient, the piezomagnetic coefficient, the magnetic conductivity and the loss angle of the giant magnetostriction bar are obtained, and the system is suitable for comprehensive evaluation of the performance of the bar under different bias magnetic fields, prestressing forces and temperature conditions.

The invention discloses cluster beam equipment, which relates to the technical field of cluster beams and comprises a working platform, and a cluster generation mechanism, a beam regulation and control mechanism, a beam screening mechanism and a deposition mechanism which are connected in sequence. The working platform is provided with a sliding rail and a sliding structure, so that all mechanisms can be flexibly positioned, disassembled and assembled. The cluster generation mechanism comprises an angle-adjustable condensation cavity, an adjustable nozzle and an ion funnel, so that accurate generation of clusters is realized; a conical sputter of the beam regulation and control mechanism separates non-scattering beams; the beam screening mechanism adapts to different quality screening requirements through an ion optical assembly and a multi-layer conductive polar plate quality selector; the deposition mechanism is provided with a full-degree-of-freedom manipulator, a magnetic driving rod and a telescopic mechanism, substrate installation and adjustment are conveniently completed, and the stability of the vacuum environment is guaranteed. The equipment solves the problems that existing equipment is inconvenient to adjust, complex to operate, insufficient in stability and the like, the assembling and debugging efficiency and adaptability are improved, and the equipment is suitable for material preparation in multiple fields.

A rigid height control system configured to be coupled to a header includes a rigid arm pivotally coupled to a shaft. The rigid arm includes an upper end and a lower end, wherein the lower end is configured to engage a ground surface. The rigid height control system includes a metal channel guide coupled to the shaft and a magnet embedded within the rigid arm adjacent the upper end. The magnet is configured to keep the rigid arm attached to the metal channel guide via a magnetic force so that the lower end engages the ground surface when the agricultural harvester travels in a forward direction. The magnet is configured, when the agricultural harvester travels in a reverse direction causing a force exerted by the ground surface on the rigid arm to exceed the magnetic force, to allow a release of the rigid arm from the metal channel guide.

The invention discloses liquid dressing production equipment, and relates to the technical field of medical instrument production equipment.The liquid dressing production equipment is characterized in that firstly, neodymium iron boron magnets of a driving rotary disc and a driven rotary disc are in coupling transmission, and a middle isolation sleeve is matched, so that complete physical isolation inside and outside a kettle is achieved; a uniform magnetic field generated by Helmholtz coils is used for weakening attraction force among particles, a dynamic magnetic field gradient formed by rotation of a permanent magnet arranged in a stirring paddle can cooperate with mechanical shearing, so that the internal structure of an aggregate is deeply destroyed, meanwhile, the Helmholtz coils in three orthogonal directions provide a global uniform static magnetic field, and the aggregate is fully dispersed. The stability of the magnetic background in the kettle can be ensured, the global effect of the dynamic magnetic field gradient is matched, the local defect caused by purely depending on mechanical shearing is avoided, the dispersion uniformity is remarkably improved, the influence of the concentration gradient on the physical and chemical properties is reduced, and the influence of initial agglomeration on the subsequent process can be reduced by utilizing the efficient dispersion capacity of the magnetic mixing assembly.

The invention relates to the technical field of welding devices, in particular to a cooling fan machining welding device which comprises a base, a heat insulation table is fixedly mounted at the upper end of the base, a tray used for containing a fan hub is arranged in the heat insulation table, a limiting ring is rotatably mounted at the inner end of the heat insulation table, and a plurality of movable face shells are slidably mounted at the inner end of the limiting ring; the end, close to the tray, of each movable face shell is rotationally provided with an angle plate, the end, away from the corresponding movable face shell, of each angle plate is rotationally connected with two clamping blocks, and the ends of the two clamping blocks rotate towards each other. An operator only needs to finely adjust the horizontal angle of the fan hub, the push block can push the sealing rod to move downwards, the center rod is stably kept in a vertical state under the attraction action of magnetic force, automatic leveling of the fan hub is achieved, welding deviation caused by inclination of the fan hub is effectively avoided, and therefore the welding precision and the welding stability are remarkably improved.

The invention provides a permanent magnet radial-axial collaborative balancing device and method for a shield pump, and belongs to the technical field of shield pumps. The device comprises a pump shell, an impeller, a rotor assembly, a stator assembly, a shaft, a thrust bearing, a rotor permanent magnet component and a static permanent magnet component, the rotor permanent magnet component and the static permanent magnet component correspond to each other, the rotor permanent magnet component is embedded below an impeller front cover plate opening ring, and the static permanent magnet component is embedded into the corresponding inner wall of the pump shell. The magnetization direction and the axis of the pump shaft form a preset inclination angle and are in mirror symmetry, so that a repulsive magnetic circuit with opposite same-name magnetic poles is formed; space magnetic force generated during working can be decomposed into radial and axial components. The radial component provides restoring force pointing to the center when the rotor deviates, and the radial stability is enhanced. The axial component counteracts the axial thrust of the fluid, and the thrust bearing load is reduced. External energy input is not needed, the structure is compact, vibration noise can be effectively restrained, and the service life of the bearing is prolonged.

The utility model discloses a vertical magnetic cyclone precipitation combined device which comprises a secondary precipitation tank and a cyclone separator arranged in the secondary precipitation tank, the upper part of the cyclone separator is a cylindrical barrel, the lower part of the cyclone separator is of a conical structure, and an underflow outlet is formed in the bottom of the conical structure; a rotary magnetic system capable of generating spiral downward magnetic field force is arranged outside the cylindrical barrel; the inner wall of the cylindrical barrel is provided with a spiral magnetic conductive piece used for magnetism gathering and current stabilizing. A central overflow barrel is mounted in the cylindrical barrel, and an overflow discharge hole communicated with the secondary precipitation tank is formed in the top of the central overflow barrel; the side surface of the cylindrical barrel is connected with a tangential mud inlet pipe which is connected with a water inlet; a water outlet is formed in the top of the secondary precipitation tank. The device can be used for recovering a magnetic medium in magnetic coagulating sedimentation or a magnetic biofilm carrier in a magnetic biochemical system. The device has the characteristics of reasonable structural design, low energy consumption and wide application range, and is high in separation and recovery efficiency of the magnetic medium and the magnetic biofilm carrier.

The invention discloses a high-precision measurement method for internal gaps and infinitesimal displacement of a closed area based on magnetic-force-sound coupling. The high-precision measurement method comprises the following steps that (1) a sensor module is installed at the tail end of an automatic scanning mechanical arm; (2) controlling the automatic scanning mechanical arm to move, so that the sensor module is close to the surface of the detected material, thereby detecting the magnetic acting force between the magnetic force detection probe (3) and the detected material, and calculating the vertical distance between the magnetic force detection probe (3) and the surface of the detected material; 3) synchronously measuring the film thickness T on the surface of the measured material by using an ultrasonic detection probe; and 4) based on the vertical distance between the magnetic detection probe (3) and the surface of the detected material and the thickness T of the film on the surface of the detected material, calculating the micro-gap between the film and the surface of the detected material. The detection signal is not influenced by factors such as environment temperature and material heat conductivity difference, and existence and specific size of the gap can be accurately detected.

The invention relates to the technical field of magnetic deburring machines, and discloses a magnetic deburring machine for polishing a pipe fitting, which comprises a polishing machine, a container for placing the pipe fitting to be cleaned and a magnetic needle is arranged in the polishing machine, a first magnetic group is arranged in the polishing machine and at the bottom of the container, the first magnetic group is driven to rotate by a motor, the container is cylindrical, and the magnetic needle is arranged in the container. Second magnetic force sets are arranged in the polishing machine and located on the outer side of the side wall of the container, the second magnetic force sets are arrayed circumferentially around the axis of the container, driving devices are arranged at the bottoms of the second magnetic force sets so that the second magnetic force sets can rotate around the axis of the container, the N poles in the first magnetic force sets upwards point to the arrangement direction of the container, and the N poles in the second magnetic force sets face to the axis of the container.

The invention relates to the technical field of pipeline detection, in particular to an intelligent non-contact pipeline detection system based on a metal magnetic memory effect, and provides the following scheme: dividing a to-be-detected pipeline into a plurality of grid units, obtaining self-leakage magnetic field data of each grid, constructing a magnetic moment matrix, and forming a magnetic field matrix; according to the method, abnormal grids are positioned based on a magnetic field matrix, a grid with the highest abnormal score is selected from a spatially continuous abnormal set through screening logic to serve as a seed grid, authenticity of adjacent abnormal grids is verified step by step in combination with a local inversion window and magnetic flux continuity constraint, false anomalies caused by magnetic flux diffusion or noise are eliminated, and the accuracy of the abnormal grids is improved. Performing magnetic moment matrix updating on the confirmed real defect grid; and finally, calculating a magnetic gradient modulus by utilizing the updated magnetic moment matrix and determining a damage grade. Adjacent lattice infection can be effectively inhibited, the defect positioning precision and the damage evaluation reliability are improved, and the method is suitable for a non-contact inspection scene of an in-service pipeline.

The invention discloses a self-energized magneto-rheological vibration reduction system and method suitable for transverse and vertical coupling vibration of a high-speed normal-conducting maglev train, and relates to the field of magnetic suspension. The suspension surface current collection coil and the guide surface current collection coil are used for inducing magnetic field changes and generating induced electromotive force; the energy management system is used for rectifying, boosting and stabilizing the induced electromotive force and storing electric energy; the acceleration detection system is used for detecting transverse and vertical vibration accelerations of the vehicle body; the control system is used for outputting control current according to the vibration signal; and the transverse magneto-rheological damper and the vertical magneto-rheological damper are used for outputting variable damping force according to the control current and restraining transverse and vertical vibration of the vehicle body. According to the method, effective suppression and energy recovery of transverse and vertical vibration are realized without depending on current frequency division processing, so that the decoupling control problem caused by active control noise in a normal-conducting magnetic levitation system is solved.

The invention discloses a magnetic suspension displacement device in a vacuum interconnection system. The magnetic suspension displacement device comprises a bearing table; the magnetic driving unit comprises a plurality of electromagnets which are arranged in an annular array, the plurality of electromagnets are divided into a plurality of groups, each group comprises two electromagnets which are collinear in the radial direction, the magnetic pole directions of the electromagnets are parallel to the radial direction, and the magnetic pole directions of the electromagnets in the same group are the same; the current switching mechanism is used for controlling the electromagnets to be sequentially switched on and off in the first direction, and the electromagnets in the same group are synchronously switched on and off to simulate rotation of the magnets to generate a balanced magnetic field; the sample table and the bearing surface are oppositely arranged at intervals; the stator is arranged in the sample table to generate a magnetic field repulsive to the balance magnetic field so as to suspend the sample table; the displacement driving unit is used for driving the bearing table to move. According to the invention, the sample table can be stably suspended and fixed at a position opposite to the bearing table, no mechanical vibration is generated, the switching frequency and the magnetic force are adjustable, the stability and controllability of the sample table in the start-stop state are improved, and the application is suitable for vacuum interconnection systems of wafer production lines with different sizes.

The application provides a kind of super magnetostrictive bar multi-physical field coupling dynamic characteristic monitoring system, including magnetic field loading module, mechanics loading module, thermal environment control module, signal detection module and signal processing module.Magnetic field loading module generates wide frequency superimposed magnetic field through DC bias coil and AC driving coil;Mechanics loading module applies pre-stress using hydraulic device;Thermal environment control module accurately controls temperature in the range of-50℃ to 300℃.Signal detection module integrates B measurement coil, H measurement coil, laser displacement sensor, pressure sensor and acoustic emission sensor, realizes high-speed synchronous acquisition of multi-physical field parameters;Signal processing module transmits data to host computer for recording and analysis in real time based on data acquisition card.The system constructs magnetic-force-thermal coupling excitation environment, obtains magnetostrictive coefficient, piezomagnetic coefficient, magnetic permeability and loss angle of super magnetostrictive bar, and is suitable for comprehensive evaluation of bar performance under different bias magnetic field, pre-stress and temperature conditions.

The invention provides a magnetic levitation type mechanical damping device for ultra-low-frequency vertical vortex-induced vibration of a super-large-span bridge girder, and belongs to the field of low-frequency structure vertical vibration control. The device comprises a mounting base, a top connecting plate, a spring device, a mass block, a magnetic force compensation unit, a damping device and a plurality of guide devices, the multiple guide devices are installed between the installation base and the top connecting plate, the mass blocks are installed on the peripheries of the multiple guide devices, the magnetic force compensation units are installed on the peripheries of the mass blocks, and the mass blocks can vertically move along the guide devices under the action of the magnetic force compensation units. Wherein the spring device and the damping device are vertically arranged between the top connecting plate and the mass block in parallel. The core innovation of the invention lies in providing a magnetic active compensation mechanism, and through a gradient magnetic field with a special configuration, approximately constant upward buoyancy is generated in a TMD vertical motion stroke, so that the mass block is always in a quasi-suspension state, and complete gravity unloading and dynamic tuning separation are realized.

The utility model discloses a magnetic stirrer with an efficient stirring function, which comprises a stirring barrel, a liquid inlet valve fixedly connected to one end of the upper part of the stirring barrel, a liquid discharge valve fixedly connected to one end of the lower part of the stirring barrel, a supporting column fixedly connected to the other end of the lower part of the stirring barrel, and a bottom plate fixedly connected to the lower part of the supporting column, a magnetic transmission mechanism is fixedly connected to the middle position above the stirring barrel, a rotating rod is movably inserted into the inner side of the stirring barrel, a stirring mechanism is fixedly clamped to the surface of the rotating rod, and a fixing mechanism is fixedly arranged at the other end above the bottom plate; the radial extension range of the stirring blades can be dynamically adjusted through linkage extension of the hydraulic telescopic rod and the folding rod in the stirring mechanism, and the attack angle and the coverage area of the stirring blades in fluids with different viscosities can be automatically adjusted in combination with real-time feedback control of the adjusting sensor on the pitch angle of the stirring blades, so that the mixing efficiency is remarkably improved.

The invention provides a non-contact micro magnetic force measuring device, and belongs to the field of non-contact micro force measurement. The problem that it is difficult to measure the curve of the micro force changing along with the distance by directly connecting the weight is solved. The magnetic force calibration device is suitable for magnetic force calibration between permanent magnets with the output magnitude of milliNewton, and the specific application range is that the minimum stepping distance capable of being tested by the device is 0.1 mm, and the applicable temperature is 0-35 DEG C. Micro magnetic force is generated through the two centering permanent magnet columns, the direction is vertically downward, different micro magnetic force is obtained by changing the distance between the two permanent magnets through the XYZ moving table, and the micro magnetic force is measured through the electronic balance. The device can realize the target that the axes of the two permanent magnets are positioned in the center of the electronic balance. The micro electromagnetic force measuring device can achieve the purpose of static calibration of a milliNewton-level magnetic force generation system at different temperatures.

The invention provides a control method and device of charging equipment for a magnetic suction type ship, a medium and a controller, and aims to solve the problems that when an electric ship or a hybrid power ship is in shore for charging, a charging connecting device is prone to loosening, sealing failure, poor contact and the like due to stormy wave swing, and a magnetic suction fixing device is additionally arranged on the charging connecting device; the charging plug and the charging socket are firmly fixed through magnetic force, the stability and reliability of the charging process are remarkably improved, the charging failure caused by ship swing is effectively avoided, and the safety and efficiency of ship charging are guaranteed.

The invention relates to the technical field of motor control, and discloses a torque adjustment control method of a magnetic stirrer based on sample characteristics, which comprises the following steps: acquiring an armature three-phase current and a rotor position signal, and converting the armature three-phase current and the rotor position signal into a quadrature-axis actually measured current and a direct-axis actually measured current by utilizing coordinate transformation logic; extracting a magnetic declination estimated value reflecting the phase lag degree of the stirrer based on an electromagnetic coupling model; calculating a magnetic declination change rate according to the magnetic declination estimated value of the continuous sampling period; a transient compensation current is generated by adopting a nonlinear compensation operator and combining a real-time synchronous torque coefficient; according to the invention, the transient characteristics of the magnetic declination are utilized to realize the real-time sensing of the load disturbance, the magnetic coupling slippage caused by the sudden change of the characteristics of the sample is effectively inhibited, and the stability of the magnetic declination is improved. And the ineffective temperature rise of the motor is reduced while the system stability is guaranteed.

The invention discloses a magnetic fixture for weak-rigidity workpieces and a self-adaptive clamping method. The magnetic fixture comprises a unit mounting mechanism and a plurality of independent clamping units arranged in the unit mounting mechanism. Each clamping unit is provided with a limiting mechanism, a locking mechanism and a controllable magnetic attraction mechanism. And the clamping unit is mounted in the unit mounting mechanism through the limiting mechanism and is matched with the reference locking mechanism through the limiting mechanism, so that switching between a locking state and a floating state is realized. The controllable magnetic attraction mechanism is controllable in partition and used for attracting workpieces and can generate a gradient magnetic field matched with rigidity distribution of the workpieces and apply adaptive attraction force through optimized magnetic pole array design, and the problem that when a traditional magnetic clamp is used for clamping weak rigidity workpieces such as thin-wall workpieces, large workpieces and complex structures, the rigidity of the workpieces cannot be adjusted easily is solved. And due to'flattening 'deformation caused by too large or non-uniform clamping force, stress-free or low-stress positioning is realized, so that the final precision of contour machining is remarkably improved.

The application discloses an automatic magnetic force polishing and separating equipment, which comprises a rack, a magnetic force polishing machine and a magnetic force separating machine; the magnetic force polishing machine comprises a polishing barrel and a first rotating magnetic field device, the first rotating magnetic field device is arranged on the rack, and the polishing barrel is arranged on the top of the first rotating magnetic field device; the magnetic force separating machine comprises a separating barrel and a second rotating magnetic field device, the second rotating magnetic field device is arranged on the rack, and the separating barrel is arranged on the top of the second rotating magnetic field device; the separating barrel is provided with a separating chamber and a recycling chamber arranged below the separating chamber, the separating barrel is provided with filter holes allowing the magnetic abrasive in the separating chamber to enter the recycling chamber, and the rack is provided with a turnover device for overturning the polishing barrel, so that the workpiece and the magnetic abrasive in the polishing barrel can be poured into the separating chamber. The magnetic force polishing and the magnetic force separating are integrated, the whole process automation of the magnetic force polishing and the separation of the magnetic abrasive and the workpiece after polishing is realized, and the production efficiency and the stability of the polishing quality are ensured.

The invention belongs to the technical field of cross arm iron accessories, and particularly relates to a high-stability fastening type cross arm iron accessory which comprises a fixing mechanism and an anti-seismic mechanism located at the top of the fixing mechanism, the anti-seismic mechanism comprises two movable blocks, and the top of each movable block is slidably connected with a first fixing frame; limiting sliding grooves are formed in the left side and the right side of the inner wall of each first fixing frame, and limiting sliding blocks matched with the limiting sliding grooves are fixedly connected to the left side and the right side of the movable block. A first fixing frame moves downwards to be matched with a movable block to extrude a damping spring to generate elastic potential energy, a damper is matched to consume part of energy generated by vibration, guide sliding blocks on the two sides are controlled to be away from each other through an adjusting plate, a magnet block is close to a magnetic base, repulsive force is generated through magnetic repulsion, and the energy generated by vibration is further consumed; the anti-seismic operation is realized, and the problem that the risk of loosening of a connecting part is caused by vibration generated by blowing of the cross arm iron accessory in the wind direction is solved.