1477 results about "Magnetic levitation" patented technology

The invention relates to the technical field of maglev motor dynamics and control, and discloses a bearingless asynchronous motor multi-frequency harmonic vibration cooperative suppression method, which comprises the following steps: acquiring radial displacement signals and mechanical angular velocity of a rotor in an x axis and a y axis under a stator fixed coordinate system, and stacking double-axis displacement signals into an observation vector; calculating a weighting coefficient of the normalized residual error through a Huber robust cost function, and outputting the amplitude, the phase and the confidence of each order of harmonic wave; estimating the total disturbance of the system by using a linear extended state observer with harmonic energy injection, wherein the total disturbance is obtained by weighted summation according to the confidence, order and mechanical angular velocity of each order of harmonic; calculating a feedback control force according to the total disturbance estimated value, and superposing the feedforward compensation force and the feedback control force to generate a total suspension force instruction; and according to the total suspension force instruction, inversely calculating a suspension winding current reference value and outputting a control instruction. According to the invention, a mutually complementary cooperative suppression mechanism is formed, and the suppression precision of multi-frequency vibration is improved.

The application relates to a joint type magnetic levitation turnout structure and a turnout line shape, and the magnetic levitation turnout structure comprises multiple joint beams which are sequentially connected in a head-to-tail mode; when the turnout is switched, the joint beams are rotated to the side line position under the action of a driving device, so that the connection between the adjacent joint beams is rotated to form an angle to make the multiple joint beams fit the side line curve after the turnout is switched; the passive beam is arranged between the adjacent joint beams or between the joint beam and the pier beam, and the passive beam forms a transition line segment between the adjacent joint beams or between the joint beam and the pier beam when the turnout is switched. The application forms a broken line to fit the switching curve through the joint beam, passive beams are arranged between each joint broken line, the switching angle of the transition broken line is further transitioned, the curve line shape can be better fitted, and the smoothness when the vehicle passes through the turnout is improved.

The invention provides a surge protection method for a magnetic suspension blower, and belongs to the technical field of blowers, and the surge protection method for the magnetic suspension blower comprises the following steps: measuring the outlet pressure of the magnetic suspension blower in real time; when the outlet pressure is smaller than or equal to the surge protection threshold value, the magnetic suspension blower operates normally; when the outlet pressure is larger than the surge protection threshold value, timing is started, and the duration t when the outlet pressure is larger than the surge protection threshold value is obtained; when the duration t is smaller than a first preset value, the magnetic suspension air blower operates normally; and when the duration t is larger than or equal to the first preset value, surge protection is triggered, and the magnetic suspension air blower is shut down. According to the surge protection method for the magnetic suspension air blower, non-surge overpressure conditions such as load sudden change and pipeline instantaneous fluctuation can be effectively filtered, the false triggering probability of surge protection is greatly reduced, and the operation continuity of the air blower and the stability of field production are guaranteed.

The invention provides an anti-surge and anti-backflow control method for a magnetic suspension air blower, and belongs to the technical field of air blowers. The anti-surge and anti-backflow control method for the magnetic suspension air blower comprises the steps that an electric check valve is arranged in an air supply pipeline outside fan equipment, and the electric check valve is electrically connected with a system corresponding to the magnetic suspension air blower; a plurality of rotating speed gears are divided in a low-speed operation interval of the fan, different rotating speed gears correspond to different opening degrees of the electric check valve, and the larger the rotating speed is, the larger the opening degree of the corresponding electric check valve is; the fan enters a low-speed operation interval after being started, the rotating speed gear of the motor is adjusted step by step from small to large, and the system correspondingly adjusts the opening degree of the electric check valve according to the rotating speed gear where the motor is located; and after the fan enters the high-speed operation interval, the electric check valve is fully opened, and the speed is directly increased to the target set rotating speed. According to the anti-surge and anti-backflow control method for the magnetic suspension air blower, the surge inducement of sudden pressure rise caused by closing of the electric check valve is avoided.

The invention discloses a magnetic suspension bearing displacement detection method and device, a magnetic suspension bearing system, a storage medium and a computer program product, an axial displacement detection area of a magnetic suspension bearing is provided with four displacement detection probes used for detecting axial displacement of a rotor, and the four probes are divided into two groups; the first group of two probes are installed along a first symmetrical direction, the second group of two probes are installed along a second symmetrical direction orthogonal to the first symmetrical direction, the design parameters of the same group of probes are consistent, and the design parameters of the different groups of probes are not consistent; the method comprises the following steps: carrying out mean value and difference operation on signals acquired by four probes to eliminate radial coupling interference; and filtering the signal subjected to mean value operation and differential operation by adopting same-frequency notch processing so as to filter radial coupling interference. According to the scheme, high-precision stable operation of magnetic suspension axial displacement is realized.

The invention discloses a half-open type thrust magnetic levitation bearing. The bearing comprises a first magnetic ring, a second magnetic ring and a third magnetic ring, wherein the first magnetic ring, the second magnetic ring and the third magnetic ring are arranged in annular and laminating manners so as to form an annular magnetic pole; the magnetic pole of each of the magnetic rings is different from that of the adjacent magnetic ring; a first winding and a second winding of the annular magnetic pole are wound according to a predetermined half-open way, the lower part of the middle magnetic pole is recessed inwards so as to generate a winding space which meets predetermined conditions; and the magnetic pole arranged at the upper end extends, and thus, a complete circle of magnetic pole is formed after splicing. Based on the bearing, continuity and consistency of magnetic field strength of the magnetic poles of the half-opened axial thrust bearing can be basically reserved, and the half-open type thrust magnetic levitation bearing can be applied to high-speed rotation machines; and moreover, a more flexible mounting way can be obtained, particularly to large-size rotation machines.

The invention discloses a maglev engineering vehicle, which relates to the technical field of maglev vehicles, and comprises a first suspension frame unit, a second suspension frame unit and a third suspension frame unit, fixed sliding tables are arranged between the first suspension frame unit and the second suspension frame unit and between the first suspension frame unit and the third suspension frame unit, and the fixed sliding tables are fixed to a vehicle body; the transverse stabilizing mechanism comprises a first hydraulic cylinder and a second hydraulic cylinder, when the transverse stabilizing mechanism passes through a bent road section, the first hydraulic cylinder and the second hydraulic cylinder are disconnected to relieve transverse constraint, and the second suspension frame unit and the movable sliding table on the corresponding side of the second suspension frame unit as well as the third suspension frame unit and the movable sliding table on the corresponding side of the third suspension frame unit can rotate around the rotating center of the fixed sliding table on the corresponding side. When passing through a straight road section, the first hydraulic cylinder communicates with the second hydraulic cylinder to achieve transverse constraint, and the rigidity between the vehicle body and the suspension frame unit is guaranteed. According to the maglev engineering vehicle, the curve passing capacity and the curve passing balance stability of the maglev engineering vehicle can be improved.

The invention discloses an oil-free magnetic suspension low-temperature refrigerating unit control method and a storage medium, and relates to the technical field of intelligent refrigerating unit control, cooperative control between units is achieved through a multi-agent reinforcement learning framework, and a system can autonomously recognize and restrain the pressure fluctuation coupling phenomenon between parallel units; coherence and phase difference of pressure signals between units are monitored in real time by adopting a frequency domain analysis method, so that the system can predict surge risk in advance and adopt a phase desynchronization strategy, and coupling oscillation is avoided fundamentally; the design of the collaborative reward function embeds the anti-surge priority principle into the agent decision process, it is ensured that the anti-surge control weight is automatically enhanced when the system approaches the surge boundary, and meanwhile energy efficiency optimization and operation stability are considered; a near-end strategy optimization algorithm based on an attention mechanism enables each agent to effectively learn an interaction relationship between units, thereby generating a coordinated control instruction.

The invention relates to the technical field of magnetic suspension stirring, and particularly discloses a magnetic suspension stirring method for materials, which comprises the following steps: S1, preparation of materials and a stirring part: to-be-stirred materials are added into an accommodating container, and the magnetic suspension stirring part is arranged in the accommodating container; the stirring piece is provided with an axial response magnet, a radial response magnet, a motor rotor part and a stirring part; s2, magnetic suspension positioning: axial suspension of the stirring part is realized through magnetic repulsive force between an axial magnet below the accommodating container and an axial response magnet of the stirring part; radial suspension of the stirring piece is realized through magnetic repulsive force between a radial annular magnet on the circumferential periphery of the accommodating container and a radial response magnet of the stirring piece; and S3, magnetically-driven stirring: driving the stirring piece to rotate around a rotating axis through cooperation of a motor stator part on the circumferential periphery of the accommodating container and a corresponding motor rotor part of the stirring piece, and performing magnetic suspension stirring on the materials in the accommodating container through the stirring part.

The present invention provides a tower lift. The tower lift includes: a rail module extended in a vertical direction; and a carriage module provided to be movable by a magnetic levitation method along the rail module, in which in the carriage module, a braking unit which brakes falling of the carriage module when power driving the tower lift is cut is installed.

The invention provides an integrated control method for a magnetic suspension air compressor, and belongs to the technical field of motor driving and elastic fluid compression equipment control crossing. The method comprises the steps that S1, system initialization and multi-parameter real-time collection are conducted; s2, parameter preprocessing and feature extraction; s3, a multi-algorithm fusion control decision is made; s4, generating and converting a control instruction; and S5, executing mechanism driving and real-time feedback. Through deep integration of efficient driving of the permanent magnet synchronous motor, stable suspension of the magnetic suspension bearing, pressure-flow coordinated adjustment of elastic fluid (air) and full-link fault safety management and control, the air compressor is suitable for industrial-grade air compression equipment with a centrifugal structure and the permanent magnet synchronous motor as core power; the compressed air supply system can be widely applied to the scenes such as manufacturing industry, energy, municipal administration and the like which have strict requirements for stability and efficiency of compressed air supply.

The utility model discloses a continuous conductor plate for a magnetic suspension automobile, which comprises a first conductor plate and a second conductor plate which are connected with each other, the end part of the first conductor plate is provided with a first splicing part, the end part of the second conductor plate is provided with a second splicing part, and the shapes of the first splicing part and the second splicing part are complementary. And the first splicing part and the second splicing part are spliced together to form a continuous conductor plate. When the magnetic wheel of the magnetic suspension automobile passes through the gap between the conductor plates, the first conductor plate provides an eddy current field before passing through the gap, and the second conductor plate provides an eddy current field after passing through the gap, so that the continuity of eddy current is ensured, and the operation efficiency of the whole system of the magnetic suspension automobile and the conductor plates is improved.

The invention discloses an anomaly detection method, device and equipment for a maglev train suspension system and a medium, and relates to the technical field of maglev train detection. The method comprises the following steps: acquiring multi-source operation time sequence data of a maglev train suspension system in real time; carrying out automatic feature extraction on the suspension system through a first neural network model to obtain feature vectors used for representing dynamic response behaviors of the suspension system under different working conditions; inputting the feature vector into a trained second neural network model to obtain an anomaly detection score; the second neural network model is a time sequence neural network and is used for outputting a quantitative score value representing the state abnormity possibility of the suspension system according to the input vector; and when the anomaly detection score indicates that the suspension system is in an abnormal state, performing fault mode classification on the abnormal state according to a preset fault classification rule. According to the technical scheme of the invention, the method breaks through the limitation that a conventional method is insufficient in coupling feature extraction, and achieves the precise anomaly detection and fault classification of the suspension system.

The invention relates to a magnetic suspension bearing control system and method and refrigeration equipment, and the system comprises a magnetic suspension bearing control module which is used for controlling a magnetic suspension bearing; the battery management module is electrically connected with the magnetic suspension bearing control module; and the master control module is respectively connected with the magnetic suspension bearing control module and the battery management module and can control the battery management module to store electric energy when the voltage of the magnetic suspension bearing control module is excessive and supply power to the magnetic suspension bearing control module when the power supply of the magnetic suspension bearing control module is insufficient. According to the technical scheme of the magnetic suspension bearing control system, through cooperative work of the battery management module and the master control module, the stability, the energy-saving performance and the response speed of the system are enhanced, the service life of equipment is effectively prolonged, and the maintenance cost is reduced. The integrated solution provides a safer, more reliable and more economical operating environment for high-performance and high-precision mechanical equipment.

This disclosure provides a magnetic levitation motor, comprising: a motor rotor; a reduction stator configured to, after the magnetic levitation motor switches from a first preset state to a second preset state, apply a magnetic field force in a preset direction to the motor rotor to generate resistance and decelerate the motor rotor; and a control system configured to be electrically connected to the reduction stator, wherein when the magnetic levitation motor is in the first preset state, the control system controls the rotation of the motor rotor; and after the magnetic levitation motor switches from the first preset state to the second preset state, the control system controls the reduction stator to decelerate the motor rotor. The addition of a reduction stator and optimized control logic in the magnetic levitation motor provide protection, preventing damage to motor components caused by unexpected power outages, improving product quality, ensuring the reliability of the high-speed magnetic levitation motor, eliminating potential risks from unexpected power outages, and reducing losses.

The invention discloses a control device of a magnetic suspension bearing driver, a magnetic suspension bearing and a control method of the magnetic suspension bearing driver, and the device comprises a control unit which outputs a first group of control signals to an auxiliary resonance unit; the auxiliary resonance unit is arranged on the input side of the bridge circuit and provides bus voltage for the input side of the bridge circuit under the control of the first group of control signals output by the control unit based on preset power supply voltage; the control unit is also used for outputting a second group of control signals to the bridge circuit; and the bridge circuit is used for realizing soft switching control under the control of the second group of control signals output by the control unit based on the bus voltage provided by the auxiliary resonance unit. According to the scheme, the auxiliary resonance circuit is additionally arranged in front of the bridge circuit, and the equivalent capacitor module is additionally arranged in the bridge circuit, so that the switching power amplifier in the bridge circuit realizes zero-voltage starting, the switching peak current can be reduced, the power loss is reduced, and the service life of the switching power amplifier is prolonged.

The invention relates to the field of magnetic suspension motor driving control, and discloses a high-reliability motor commutation method based on same-frequency displacement conversion of a magnetic suspension rotor, and the method comprises the following steps: collecting a multi-channel rotor displacement signal of a magnetic suspension bearing system; carrying out same-frequency positive-sequence component extraction and phase locking calculation to obtain a rotor space angle position estimation value; multiple paths of redundant rotor angular position signals are constructed, and main rotor space angular position signals are generated; executing initial alignment and error correction of a motor rotor angle, and locking an angle compensation value in a closed loop mode based on the waveform change rate of the direct current bus current at the pre-estimated commutation moment; synthesizing the motor commutation angle, and generating a pulse width modulation signal to drive the motor to operate. A magnetic suspension rotor displacement signal is processed through a second-order generalized integrator cascade instantaneous symmetric component method, so that the effect of high signal-to-noise ratio rotor position detection is realized by directly utilizing an existing magnetic bearing displacement sensor under the condition that a Hall element or a photoelectric encoder does not need to be additionally arranged.

The invention belongs to the technical field of hydroelectric power generation equipment and electromagnetic control, and particularly relates to an active magnetic suspension bearing vibration reduction device and method for vibration reduction of a hydroelectric generating set. The device comprises a displacement sensor, a control system, a power amplifier, a radial magnetic bearing, an axial magnetic bearing and a high-speed motor, the rotor offset and the vibration signal are detected in real time through the sensor, the controller calculates output based on PID, fuzzy control or a self-adaptive algorithm, dynamic adjustable magnetic force is formed by adjusting the current of the excitation winding, rigidity and damping regulation and control are achieved, and therefore vibration of the hydroelectric generating set is restrained.

The invention relates to a direct drive type impact mill which comprises a machine shell, a pump drainage pipe is outwards arranged in the middle of the top of the machine shell, and a grading wheel is rotationally installed at the feeding end of the pump drainage pipe; the material crushing assembly comprises a grinding ring installed in the middle of the machine shell, a material crushing disc is arranged on the inner side of the grinding ring, a plurality of crushing hammer heads are evenly distributed and fixedly connected to the periphery of the material crushing disc, and material distributing plates connected to the crushing hammer heads are fixedly connected to the material crushing disc; the driving mechanism comprises a material crushing motor, an output shaft of the driving mechanism is in transmission connection to the center of the material crushing disc, and the output shaft is rotationally mounted on a shell of the material crushing motor through a plurality of magnetic suspension bearings; the feeding assembly comprises a material guiding cover, a feeding pipe is installed on the material guiding cover in a communicating mode, a material collecting cover is arranged in the center of the material crushing disc, and the bottom of the material collecting cover and the material crushing disc are arranged in a spaced mode. According to the invention, the over-temperature problem of the bearing for installation can be effectively overcome, and the transmission amount of vibration to the material crushing motor can be reduced, so that the material crushing motor is integrally integrated in the shell to directly drive the material crushing disc.

The invention relates to the technical field of flywheel energy storage devices, and discloses a magnetic suspension flywheel energy storage device, which comprises a motor stator, a flywheel rotor and a magnetic bearing, and is characterized in that the flywheel rotor comprises a conical part and a main body part which are coaxially arranged, and the main body part is rotatably connected to the motor stator; the magnetic bearing comprises two bearing stators which are sequentially arranged in the first direction, a plurality of radial stator teeth of the bearing stators are uniformly and symmetrically distributed in the circumferential direction of a conical part, air gaps exist between the radial stator teeth and the flywheel rotor, the radial stator teeth are connected with yoke parts, and a first permanent magnet is connected between the yoke parts of the two bearing stators; the side, away from the first permanent magnet, of the yoke part of one bearing stator is connected with multiple axial stator teeth, the multiple axial stator teeth are evenly and symmetrically distributed in the circumferential direction of the conical part, and air gaps exist between the axial stator teeth and the flywheel rotor. According to the magnetic suspension flywheel energy storage device, larger axial force can be generated, more gravity loads borne by a system can be counteracted, and the suspension stability of the system is improved.

The invention discloses a magnetic suspension thrust disc structure which comprises a first magnetic disc connected to a pump shaft and rotating along with the pump shaft; the second magnetic disk is connected to the support and arranged opposite to the first magnetic disk, and the second magnetic disk and the first magnetic disk repel each other in the same polarity; the friction limiting assembly is arranged between the first magnetic disk and the second magnetic disk and separates the first magnetic disk from the second magnetic disk, a magnetic suspension gap is formed between the first magnetic disk and the second magnetic disk, one part of the friction limiting assembly is arranged on the first magnetic disk and rotates along with the first magnetic disk, and the other part of the friction limiting assembly is arranged on the second magnetic disk; in a fixed state; therefore, the technical problems that the pump cannot stably operate for a long time due to the axial force, the service life is shortened, and the performance is reduced are solved.

The invention provides a magnetic suspension axial bearing and a stator, an iron core, a compressor and a method thereof, the stator iron core comprises a first sub-block and a second sub-block, the first sub-block is provided with an iron core inner ring, the second sub-block is provided with an iron core outer ring, the iron core inner ring is used for being sleeved and fixed on the outer side of an insulation framework, and the insulation framework is sleeved and fixed on the outer side of the first sub-block. The annular winding groove, deviating from one side of the iron core inner ring, of the insulating framework extends in the circumferential direction of the iron core inner ring; wherein the second sub-block is used for being assembled on the first sub-block, so that the iron core outer ring is arranged on the outer side of the iron core inner ring in a sleeving manner, and an annular groove for accommodating the insulating framework is formed between the iron core outer ring and the iron core inner ring. According to the invention, the winding difficulty can be reduced.

The invention discloses a high-speed maglev train suspension constraint control method for coping with long-wave oscillation of a track beam, and belongs to the field of maglev track traffic. The method comprises the following steps: dynamically expanding high-speed maglev train model prediction suspension control under asymmetric preset performance constraints, and coping with safety constraint control of accurate suspension of the high-speed maglev train with long-wave oscillation of a track beam: establishing a track model of the long-wave oscillation of the track beam; designing the precise suspension dynamic expansion asymmetric preset performance constraint of the high-speed maglev train according to the long-wave oscillation information of the track beam; designing a high-speed maglev train suspension air gap mathematical model containing track beam long-wave oscillation information; obtaining a state space expression based on a reconstruction error according to the dynamic expansion asymmetric preset performance constraint and the conversion error; a prediction model is obtained through the expression, an optimal control problem is designed, and an optimal solution is solved; on the premise that the track beam oscillation reference air gap tracking precision is improved, suspension deadlock of the high-speed maglev train under long-wave oscillation of the track beam is avoided, and it is ensured that the high-speed maglev train runs safely in a small suspension gap with low power consumption under long-wave oscillation of the track beam.

The utility model discloses a magnetic suspension bearing and a magnetic suspension compressor, and relates to the technical field of magnetic suspension compressors, the magnetic suspension bearing comprises a magnetic conductive ring and a plurality of positioning pieces, the magnetic conductive ring comprises a base part and a step part arranged on the base part in a protruding manner, and the base part surrounds the periphery of the step part; the plurality of positioning pieces are respectively connected to the base part, the plurality of positioning pieces are distributed at intervals in the circumferential direction of the base part, and a magnetic steel mounting position is formed between every two adjacent positioning pieces and the step part; according to the technical scheme of the utility model, the integrated positioning piece is arranged in a split manner, and meanwhile, the original radial limiting function of the positioning piece on the magnetic steel is integrated into the magnetic conductive ring body structure, so that the processing difficulty of the positioning piece is reduced, the production yield and the production efficiency of the positioning piece are improved, and the transportation of the positioning piece is facilitated.

The invention relates to the technical field of magnetic suspension compressor assembly, and particularly discloses a magnetic pollution source prevention and control optimization method in a magnetic suspension compressor assembly process, which comprises the following steps: in a pretreatment stage of magnetic suspension compressor assembly, dynamically optimizing thermal cycle parameters in a low-temperature environment by adopting a self-adaptive genetic algorithm; ferromagnetic impurities hidden in microdefects of the compressor component are accurately induced to be released in advance; carrying out feature extraction and pattern recognition on the released impurity signals in combination with wavelet packet transformation and a neural network algorithm; according to the method, a low-temperature thermal cycle process optimized by a self-adaptive genetic algorithm is constructed in the pre-assembly treatment stage, ferromagnetic impurities hidden in microcracks are accurately induced to be released in advance, and accurate removal of the impurities before entering the assembly link is realized by combining wavelet packet transformation and targeted pulse demagnetization driven by a neural network; the limitation that impurities in the microdefects cannot be touched by a traditional cleaning and demagnetizing method is broken through, and the hidden danger of magnetic pollution which cannot be found by initial detection is eliminated from the source.

The invention discloses a power supply system for a magnetic suspension bearing controller. The power supply system comprises an alternating current / direct current voltage conversion unit, a switch control unit, a voltage selection unit, an energy storage unit, a motor, a rectification filtering unit and a direct current / direct current voltage conversion unit, the rectifying and filtering unit rectifies and filters alternating-current voltage output by the motor to generate second direct-current voltage, the direct-current / direct-current voltage conversion unit boosts or reduces the second direct-current voltage to generate third direct-current voltage, and the switch control unit controls on-off of branches where the rectifying and filtering unit and the direct-current / direct-current voltage conversion unit are located. According to the power supply system provided by the invention, natural seamless switching among three power supplies can be realized in the whole process of a magnetic suspension motor system from normal working to tripping power failure to the speed reduction of a rotor below a safe speed value and stopping on an auxiliary bearing, so that safe shutdown of a magnetic suspension motor under a power loss condition is ensured.

The application discloses a magnetic suspension robot, and belongs to the technical field of robots.The magnetic suspension robot comprises a magnetic suspension assembly, a body and a buffer assembly, the magnetic suspension assembly is connected with a walking assembly; the buffer assembly comprises a buffer piece and a radial telescopic touch piece, the touch piece comprises a touch part and a buffer part connected with the touch part, the buffer piece comprises a first magnet arranged towards the buffer part and an elastic body abutting against the first magnet, and the buffer part is compressed to realize buffering when moving towards the first magnet; a Hall inductor is arranged on the body at a position corresponding to the first magnet, the Hall inductor is signal-connected with the magnetic suspension assembly, and the Hall inductor starts the magnetic suspension assembly after sensing the displacement signal of the first magnet.The buffer piece and the touch piece are matched to realize the buffering of the magnetic suspension robot after collision, the signal is transmitted to the magnetic suspension assembly through the Hall inductor to realize the suspension of the body, the rigid constraint on the body is reduced, the flexible motion space of the body is improved, and the damage caused by collision is further reduced.

The utility model discloses a magnetic suspension type pipeline fluid viscosity detection device, which relates to the field of liquid detection, and comprises a material conveying pipe and a rotary viscometer body, the side wall of the material conveying pipe is communicated with a material taking pipe, the upper surface of the material conveying pipe is fixedly connected with a detection box, and the lower side of the detection box is communicated with the material taking pipe through an L-shaped pipe. The piston is driven by the two shifting plates to move in the material taking pipe, then the threaded rod is rotated, the threaded rod is in threaded connection with the threaded sleeve to drive the plug cover and the piston to move together till the end opening connecting position of the material taking pipe is completely plugged by the plug cover, at the moment, part of flowing liquid enters the material taking pipe, and then through pushing and extracting, the material taking pipe is opened. The whole operation process is rapid and convenient, outward sampling is not needed, the sampling time of a traditional testing method is saved, normal conveying of materials is not affected, more importantly, waste of the tested materials is avoided, and practicability is improved.

The utility model discloses a multifunctional magnetic suspension fan model display platform, which comprises a trolley frame and connecting arms, the top end of the trolley frame is symmetrically and movably provided with the connecting arms, the outer wall of one group of connecting arms is provided with a servo motor, the output end of the servo motor is provided with a rotating shaft, and the rotating shaft extends to the outside of the connecting arms. A turnover frame is movably installed between the two sets of connecting arms and connected with the rotating shaft, a limiting shaft is installed on the side, away from the rotating shaft, of the outer wall of the turnover frame, and the turnover frame is connected with the other set of connecting arms through the limiting shaft. According to the utility model, the multi-stage linkage type control rotation of the multi-functional magnetic suspension fan model display platform on the magnetic suspension fan model is realized, the rotation of the magnetic suspension fan model is facilitated while the overturning display is carried out, and the convenient multi-height adjustment of the magnetic suspension fan model by the display platform is also facilitated; and the display effect and the visibility of the magnetic suspension fan model are improved.

The invention relates to the technical field of oil fume purification, in particular to a magnetic suspension bearing motor for an oil fume purification device and the oil fume purification device.The magnetic suspension bearing motor comprises a rotating shaft, a radial magnetic bearing unit, a radial sensor and a control system.The rotating shaft is used for being connected with an impeller of the oil fume purification device; the radial magnetic bearing unit comprises a radial rotor and a radial stator, the radial rotor sleeves the rotating shaft, the radial stator is located on the radial outer side of the radial rotor, and the radial stator comprises a first coil winding arranged in the circumferential direction of the radial stator; the radial sensor corresponds to the rotating shaft and is used for acquiring radial displacement of the rotating shaft and generating a radial displacement signal; the control system is electrically connected with the radial sensor and the first coil winding so as to adjust the current of the first coil winding according to the radial displacement signal, so that the electromagnetic acting force at any position between the radial stator and the radial rotor in the circumferential direction is changed, maintenance of dynamic balance of the motor is achieved, and normal operation of the motor is guaranteed.