1115 results about "Magnetorheological fluid" patented technology

The device comprises a control system, the control system is elastically connected with a multi-stage energy consumption mechanism, the control system is connected with one end of a first stay wire, and the other end of the first stay wire is used for being connected with the power transmission line and is provided with a monitoring system; the monitoring system is connected with the control system to transmit collected information to the control system, the multi-stage energy dissipation mechanism is elastically connected with the supporting plate, the supporting plate is connected with one end of the second pull wire, the other end of the second pull wire is used for being connected with a ground foundation, the multi-stage energy dissipation mechanism comprises a shell, and the two sides of the shell are elastically connected with the control system and the supporting plate respectively. A collision friction damping assembly, an eddy current damping assembly and a magnetorheological fluid damping assembly are arranged in the shell, wherein the eddy current damping assembly and the magnetorheological fluid damping assembly are connected with the control system. By the adoption of the control device, the defects of traditional vibration reduction measures are overcome.

The invention relates to the technical field of intelligent materials, in particular to low-temperature-resistant magnetorheological fluid and a preparation method thereof.The low-temperature-resistant magnetorheological fluid is prepared from, by weight, 60-75 parts of magnetic particles; 3 to 15 parts of modified magnetic particles; 10-25 parts of low-temperature-based carrier liquid, which comprises 40-60% of silicone oil and / or mineral oil, 20-30% of synthetic ester and 10-20% of poly-alpha-olefin; 0.1 to 1.0 part of a dispersant; 0.5 to 2.0 parts of an anticoagulant; wherein the modified magnetic particles are prepared by coating magnetic particles with SiO2 aerogel and grafting the coated magnetic particles with fluorine-containing silane; the preparation method comprises the steps that magnetic particles are sequentially subjected to silane coupling agent treatment, aerogel deposition and fluorine-containing silane gas-phase grafting, and modified magnetic particles are prepared; carrying out ultrasonic mixing on the base carrier liquid and an anticoagulant at 40-60 DEG C for 30 minutes; adding magnetic particles, modified magnetic particles and a dispersing agent, dispersing by adopting a micro-jet homogenizer, and then carrying out gradient cooling treatment. The low-temperature-resistant magnetorheological fluid has the effect of improving the low-temperature-resistant performance of the magnetorheological fluid.

The invention relates to an energy accumulator durability test method and system, and the system comprises an extreme working condition simulation module which can achieve high-voltage, wide-temperature-range and high-frequency dynamic loading; the multi-sensor monitoring network integrates a fiber bragg grating strain sensor, a three-axis acceleration sensor and an acoustic emission sensor to realize collaborative monitoring of strain, vibration and microcracks; the intelligent control and energy recovery module is combined with a fuzzy PID and reinforcement learning algorithm, a magnetorheological fluid generator and a super capacitor bank, so that the control precision and the energy utilization rate are improved; and the data analysis and life evaluation platform accurately predicts the residual life by using an improved Bayesian network model and a real-time health index calculation module. According to the test method, a loading mode is dynamically adjusted through a real-time health index, an energy recovery strategy is optimized, and life early warning is triggered. The invention breaks through the limitation of the traditional test and provides an integrated solution.

The invention discloses a magneto-rheological multi-dimensional vibration isolator, belongs to the field of intelligent vibration control, solves the problems that a traditional vibration isolator can only carry out vibration isolation in a single direction in a limited installation space and parameters cannot be adjusted, and comprises a shell, a rubber main spring, a spherical hinge piston, a cylinder barrel, a magnetic core assembly and a rubber bottom film. When relative movement occurs between a protected device connected with the vibration isolator and a vibration excitation object, the spherical hinge structure converts movement in all directions into vertical movement of the piston, so that magnetorheological fluid is pumped and flows through the magnetorheological fluid annular damping channel to generate damping; and the yield stress of the magnetorheological fluid in the magnetorheological fluid annular damping channel is changed by controlling the input current of the coil, so that the output of different damping forces is realized. The magneto-rheological damper, the rubber vibration isolator, the spherical hinge structure and the piston are organically combined, the structure is simple and compact, and excellent multi-dimensional vibration control, vibration isolation system parameter adjustability, wide-frequency-band vibration isolation and impact resistance are achieved.

The invention relates to the technical field of repulsive force switches, and particularly discloses a repulsive force mechanism buffer device based on magnetorheological fluid, which comprises a piston type magnetorheological damper, a magnet exciting coil, a displacement sensor and a control system, the magnet exciting coil is wound on the outer surface of a piston assembly of the piston type magnetorheological damper; the piston type magnetorheological damper adjusts the rheological property of magnetorheological fluid through a magnetic field generated by the magnet exciting coil. The displacement sensor is used for detecting the movement of a repulsive force disc in the repulsive force mechanism; the excitation coil and the displacement sensor are electrically connected with the control system; the control system regulates the power supply current intensity of the magnet exciting coil at least according to detection information of the displacement sensor; according to the repulsive force mechanism buffering device based on the magnetorheological fluid, the magnet exciting coil is used for generating a magnetic field, discharging control is conducted on the coil through the capacitor, and therefore real-time adjustment of the magnetorheological fluid damper is achieved, impact and vibration of the repulsive force mechanism are effectively reduced, the operation stability of equipment is improved, and the service life of the equipment is prolonged.

The invention discloses a motor coil winding device and method, and belongs to the technical field of motor manufacturing, the motor coil winding device comprises a winding machine body, the upper surface of the winding machine body is fixedly connected with a pair of supporting plates, and the outer surfaces of the supporting plates are provided with self-adaptive floating wire protection assemblies; a wire dynamic regulation and control assembly is installed on the upper surface of the winding machine body, a fixing piece is installed on the upper surface of the winding machine body, and a winding displacement quality sensing assembly is installed on the portion, close to the fixing piece, of the upper surface of the winding machine body. The magnetorheological fluid in the magnetorheological fluid damper rapidly changes the rheological property under the action of a real-time control magnetic field, vibration transmission is effectively restrained, the phenomenon that a wire is broken due to too large tension is avoided, when it is monitored that the tension is too small, the magnetic powder brake increases the resisting moment and slows down the rotating speed of the pay-off reel to improve the tension, and if the tension is too large, the magnetic powder brake stops working. The magnetic powder brake reduces the resistance moment and accelerates the pay-off, and ensures that the wire is always at the optimal traction angle.

The invention discloses an efficient light guide mounting bracket matched with a solar photovoltaic panel, which comprises an equipment base, a photovoltaic panel, a Fresnel lens, a magnetic field generator and a temperature difference generator, and is characterized in that the equipment base is fixedly connected with a rotating mechanism, and the rotating mechanism is movably connected with an inclination mechanism for adjusting the angle of the photovoltaic panel; a supporting mechanism is movably connected to the upper portion of the rotating mechanism and comprises a fixing support movably connected to the rotating mechanism. Through the wind-resistant mechanism, self-adaption to different wind power environments is achieved, the magnetic field intensity of the magnetic field generator is regulated and controlled, the magnetorheological fluid increases resistance to limit shaking under strong wind and reduces resistance to guarantee flexible rotation in breeze, meanwhile, a Faraday cage formed by the magnetorheological fluid shields electromagnetic interference, a photovoltaic panel is protected against wind power damage, stability of an electrical system is guaranteed, and the service life of the photovoltaic panel is prolonged. And the equipment fault risk is reduced, the service life is prolonged, and the solar photovoltaic power generation system is ensured to continuously and stably operate in a complex outdoor environment.

The invention relates to the technical field of annular sealing element assembling, and discloses an annular sealing element assembling tool which comprises a main body frame, a clamping assembly is arranged at the bottom of the main body frame, an auxiliary assembly is arranged between the clamping assembly and the main body frame, a fixing assembly is arranged at the bottom of the clamping assembly, and a cleaning assembly is arranged at the top of the clamping assembly. The space between a clamping block and a sealing piece is filled with magnetorheological fluid, the magnetorheological fluid is solidified under the action of an electromagnet, deformation of the sealing piece is reduced, a first piston plate of an auxiliary assembly extrudes air to clean dust in the sealing piece, and when the clamping block is loosened, a synchronous plate drives a third piston plate to move to assist in discharging of the magnetorheological fluid; the tool solves the problems that a traditional assembling tool is prone to deformation when clamping the sealing element, impurities are difficult to clean before assembling and the like, the sealing performance of the sealing element is guaranteed, the assembling efficiency and quality are improved, and the tool is suitable for assembling operation of the annular sealing element.

The invention belongs to the technical field of ocean engineering, and particularly provides an offshore floating platform and a modular multifunctional offshore floating platform system.The offshore floating platform comprises a main body structure layer, a building module layer and a floating body layer, and the main body structure layer is provided with a plurality of buffer assemblies; the buffering assembly comprises a fixing sleeve, a supporting rod and a buffering mechanism. The buffer mechanism is arranged in the fixed sleeve, a flowing gap is reserved between a lantern ring of the buffer mechanism and a vertical rod of the I-shaped section of the supporting rod, and the flowing gap is filled with magnetorheological fluid; the lantern ring comprises a middle fixed section, a first flexible section and a second flexible section; the first pneumatic sleeve is positioned on the outer side of the first flexible section; the second pneumatic sleeve is positioned on the outer side of the second flexible section; and the winding coil is wound on the circumferential outer wall of the middle fixed section. The offshore floating platform can counteract vertical fluctuation energy caused by the action of waves or tides in real time, so that vertical vibration of the offshore floating platform can be buffered, the stability and safety of the building module layer are ensured, and the offshore operation difficulty is reduced.

The invention discloses high-efficiency motor iron core laminating equipment which comprises a base, a support fixedly mounted at the top of the base, a top plate fixedly mounted at the top of the support, an air cylinder mounted at the top of the top plate, a punch structure mounted on an output shaft of the air cylinder, and a stepping motor mounted in the center of the inner wall of the base. A rotating shaft is mounted on an output shaft of the stepping motor, and the rotating shaft and the base are rotationally mounted through a bearing; and the stamping disc is rotationally installed at the top of the base, a groove is formed in the bottom of the stamping disc, and the inner wall of the groove and the top of the rotating shaft are fixedly installed. According to the device, through three core technologies of electromagnetic-mechanical composite driving, a multi-stage buffer structure and precise rotation positioning, the positioning repetition precision, the controllable damping characteristic of the magnetorheological fluid damper and closed-loop control formed by a pressure sensing feedback system, the lamination quality consistency is remarkably improved, electromagnetic limiting and electromagnetic stripping of a motor iron core are facilitated, and the production efficiency is improved. The use effect is good and the efficiency is high.

The invention discloses an intelligent controllable road bridge vibration detection method based on magnetorheological fluid and a damping device, and belongs to the technical field of bridge engineering structure health monitoring and vibration control, and the method comprises the steps: calculating a comprehensive vibration strength index through multi-source signal fusion and adaptive Kalman filtering, and estimating the bridge speed; the damping force is mapped through the pre-calibration database, and a damper state verification mechanism is introduced; a gain self-adaptive ceiling algorithm is combined with a fuzzy PID control force algorithm for tracking to realize accurate control; finally, the health state of the system is evaluated through performance degradation indexes of temperature compensation, corresponding devices are integrated with a sensing network, a control unit and a distributed acquisition architecture, and the problems that a traditional system is single in state sensing, fixed in control strategy, lack of a self-diagnosis function, complex in engineering wiring and the like are solved. The comprehensive solution integrating intelligent monitoring, self-adaptive control and health self-diagnosis is realized, and the reliability, adaptability and maintainability of the bridge damping system are remarkably improved.

The invention provides an active and passive combined type universal vibration isolation base and a vibration suppression method.The vibration isolation base comprises a base shell, a friction wall face, a transverse buffering mechanism, a high-strength elastomer and an axial buffering mechanism, the bottom of the base shell is connected with a vibration source, the friction wall face is installed on the inner wall of the base shell, and the transverse buffering mechanism abuts against the inner wall of the friction wall face; the vibration isolation object is connected to the top of the transverse buffering mechanism, the upper portion of the high-strength elastomer is elastically connected with the bottom of the transverse buffering mechanism, the lower portion of the high-strength elastomer is elastically connected with the top of the axial buffering mechanism, and the bottom of the axial buffering mechanism is connected to the bottom of the base shell. The transverse buffering mechanism and the axial buffering mechanism form a passive damping mechanism, and a magneto-rheological body adjusting structure arranged on the transverse buffering mechanism and a friction damping adjusting structure arranged on the friction wall face form an active adjusting mechanism. Through a passive damping mechanism and an active adjusting mechanism, efficient isolation of full-band vibration and multi-direction vibration can be achieved.

The invention belongs to the technical field of automobile vibration reduction, and provides a frequency-division double-closed-loop control method, system, medium and equipment for a vibration absorber, and the method comprises the steps that the vehicle body state of a vehicle is monitored in real time, and the vibration reduction state of the vehicle is determined based on the vehicle body state; if the vehicle is not in the vibration reduction state, a correction strategy is executed; dynamically capturing full-band vibration of the vehicle based on the correction strategy, obtaining a time domain signal and converting the time domain signal into a frequency domain signal; the frequency domain signal is processed, the current vibration type of the vehicle is determined, and a vibration reduction strategy corresponding to the current vibration type is determined based on the current vibration type; and the release current and the magnetorheological fluid state of the vehicle are regulated and controlled based on the vibration reduction strategy, and vibration reduction of the vehicle is completed. According to the invention, on the basis of effectively eliminating vibration invalid signals and eliminating interference energy, the limitation of low-frequency and high-frequency vibration dual suppression is reduced, broadband coverage is realized, the control precision is high, and the vibration reduction effect is good.

The invention relates to the technical field of cloth paving, in particular to a PTFE (polytetrafluoroethylene) base cloth paving mechanism which comprises a paving platform, and the top end of the paving platform is fixedly connected with a fixing frame; and the local fixing assembly comprises two moving blocks moving in the opposite directions, telescopic cylinders are fixedly connected to the bottom ends of the moving blocks, sliding rods are slidably connected to the inner walls of the telescopic cylinders, and smoothing blocks are fixedly connected to the bottom ends of the sliding rods. When the sliding rod drives the smoothing block to move downwards, the conducting strip synchronously moves on the resistance plate, the conducting strip and the resistance plate form a sliding rheostat, the thicker the base cloth is, the larger the resistance is, and the PLC can calculate the thickness of the base cloth by detecting current changes in a loop. Meanwhile, the current of the slide rheostat can be introduced into the N-stage electromagnet and the S-stage electromagnet, the magnetic field intensity is changed according to the magnitude of the current, then the hardness of the magnetorheological fluid is adjusted, the magnetorheological fluid generates counter-acting force on the sliding rod, and therefore the pressure of the smoothing block on the base cloth is adjusted in a self-adaptive mode according to the thickness of the base cloth.

The invention relates to an injection system, an injection method and a control method for medical capillary polishing, and the injection system comprises a first liquid storage pipe used for storing magnetorheological fluid; the first three-way connector is connected with the first liquid storage tank through a first pipeline; the first pump is connected with the first three-way joint through a second pipeline; the second pipeline comprises a vertical pipe body which is partially vertically arranged, and the space between the first pump and the vertical pipe body is filled with a gas section; the capillary tube is connected with the first three-way connector through a third pipeline; the first pinch valve is installed on the first pipeline and the third pipeline and used for cutting off the first pipeline or the third pipeline. The particle settling volume in the injection system can be reduced, the machining precision is improved, and the service life of equipment is prolonged.

The invention discloses an orthopedic ankle joint trauma recovery exercise device in the technical field of medical apparatus and instruments, comprising a base, a support rod fixedly connected to the top of the base, an adjusting assembly fixedly connected to the bottom wall of the base, movement grooves symmetrically formed in the base, movement assemblies fixedly connected in the movement grooves, tibia fixing assemblies symmetrically hinged to the support rod, and tibia fixing assemblies symmetrically hinged to the tibia fixing assemblies. The top end of the supporting rod is further fixedly connected with a controller, and the adjusting assembly, the movement assembly and the tibia fixing assembly are all in signal connection with the controller. According to the device, the requirement of three-dimensional composite rehabilitation exercise of the ankle joint of a patient is met by constructing a multi-degree-of-freedom platform, the ankle joint force application and fatigue threshold value of the patient are calculated and predicted in combination with multi-source data, real-time following of force application of the patient by resistance is achieved, efficient rehabilitation exercise is achieved, and the rehabilitation effect is improved. Buffering is actively released according to the magnetorheological fluid damping principle after the ankles of the patient reach the movement angle threshold value, the burden of movement inertia on the ankle joints of the patient is reduced, and secondary ankle sprain injuries possibly caused by rehabilitation movement are avoided.

According to the library book sorting device and the control method thereof, when books are taken out, the tops of the books are pulled out to be inclined through a book pulling device, then the books are clamped from the two sides through a book clamping device to be completely taken out, and when the books are pulled out, a control system controls the cut-off position of a cut-off distribution device on a magnetorheological fluid storage sleeve according to the thickness of the books; the flow of the magnetorheological fluid entering the book raking sleeve is adjusted, then the size of the book raking sleeve and the contact area of the book raking sleeve and the book are adjusted, meanwhile, the electrifying strength of the electromagnet is controlled, then the hardness of the magnetorheological fluid in the book raking sleeve is adjusted till the book raking sleeve can be completely attached to the book, and the book raking sleeve can be suitable for raking the thick and heavy book and can also be used for raking the book. And no extrusion stress is generated on the books, so that the books are prevented from being extruded, deformed or scratched and abraded, and nondestructive book taking and sorting are realized.

The invention discloses a carbon fiber cushion mold positioning and forming device, and relates to the technical field of composite material manufacturing, and a magnetorheological fluid positioning assembly is characterized in that firstly, magnetorheological fluid filled in an annular gap area between a stainless steel cavity and four ceramic pipe sleeves is in a liquid floating state in a pre-mold-closing stage; at the moment, the ceramic pipe sleeve does not exert any rigid constraint, so that the prepreg is allowed to be adjusted within a tiny range due to laying deviation, extrusion friction between the prepreg and the mold is eliminated through flexible adjustment of the magnetorheological fluid, the risk of fiber wrinkles or local breakage is reduced fundamentally, and along with advancing of the mold closing action of the mold, the production efficiency of the prepreg is improved. The ceramic pipe sleeve makes contact with the mold structure, contact force can be transmitted to the first pressure sensor at the top of the ceramic pipe sleeve through the ceramic pipe sleeve, and when the first pressure sensor is used for detecting and promoting a system to judge that the trigger condition of mold closing and locking is met, then the magnetorheological fluid is solidified through a magnetic field generated by the electromagnetic coil; and the ceramic pipe sleeve is in a rigid locking state.

The invention belongs to the technical field of electrics, and particularly relates to a cable tensile strength testing device which comprises a testing platform; the cable testing device comprises a testing platform, two groups of inner side clamping mechanisms are symmetrically distributed above the testing platform and used for clamping and fixing a cable from the inner side of the cable, each inner side clamping mechanism comprises a supporting disc, the center position of each supporting disc is rotatably connected with a first lead screw, and each first lead screw is in threaded connection with a movable sleeve. The detection reliability is improved through internal and external cooperative clamping, the inner side clamping mechanism drives multiple sets of clamping plates to synchronously contract centripetally through a first lead screw, the outer side clamping mechanism adjusts the clamping force through the magnetic field intensity by means of the rheological characteristic of magnetorheological fluid, the outer side clamping mechanism flexibly wraps the outer wall of a cable, the clamping force is guaranteed, skin damage is avoided, and the detection efficiency is improved. The stress of the cable in the stretching process is more uniform, and the detection data is closer to the real tensile strength.

The invention discloses a magneto-rheological damping curtain wall vibration reduction system structure, which relates to the technical field of curtain wall vibration reduction, and comprises an embedded part connector and a vibration reduction mechanism, the vibration reduction mechanism comprises a vibration reduction box, an external connection piece, a telescopic block, a magnetorheological fluid cavity, a first magnetic circuit module and a second magnetic circuit module which is fixedly arranged at one end of the telescopic block and used in cooperation with the first magnetic circuit module. The vibration reduction box is fixedly connected with the embedded part connector through an external connecting part, a reinforcing rod and a fixing block, the vibration reduction box is fixed to the unit type curtain wall joint through a clamping strip, a clamping base, a connecting plate and a connecting rod, and large vibration and deformation are avoided when the vibration reduction box is used in cooperation with a telescopic block, a magnetorheological fluid cavity, a first magnetic circuit module and a second magnetic circuit module. And the service life of the high-rise building curtain wall is prolonged, the safety performance of the high-rise building curtain wall is improved, damage of wind load vibration and earthquake force of the high-rise building curtain wall structure to the curtain wall structure is restrained, and the service life of the curtain wall is prolonged.

The invention belongs to the field of flexible electronic devices, and particularly relates to a flexible electronic skin system based on a magnetorheological fluid microneedle structure. According to the system, a micro-needle array filled with magnetorheological fluid is constructed on a flexible substrate, and dynamic adjustment of local rigidity and deformation characteristics of the micro-needle array is achieved under the action of an external magnetic field; a sensing electrode array is integrated below or inside the microneedle array; the microneedle array deforms under the action of stress, the distance or contact state change between the microneedle array and the integrated sensing electrode array is converted into capacitance, resistance or impedance signals, multi-point distributed touch or pressure sensing is achieved, and real-time acquisition and output are completed through the sensing electrode array and the signal processing module. The magnetorheological fluid is encapsulated in the hollow microneedle array structure for the first time, an arrayed flexible arrangement form is constructed, dynamic reversible adjustment of the rigidity of the microneedle unit between a liquid state and a solid-like state under the action of an external magnetic field is achieved, and the micro-needle array structure is suitable for flexible wearable equipment and a bionic interaction interface.

The invention belongs to the technical field of soft robots, and particularly relates to a variable-rigidity flexible self-sensing actuator which comprises a flexible actuator, a flexible magnetorheological fluid damping cavity, a flexible magneto-rheological fluid damping device, a flexible magneto-rheological fluid control device, a flexible magneto-rheological fluid control device, a flexible magneto-rheological fluid control device and a flexible magneto-rheological fluid control device. And the square electromagnet is arranged in the middle of the flexible actuator and used for applying a magnetic field to change the viscosity of the magnetorheological fluid. In the use process, after the flexible actuator is driven by pressure fluid, the flexible actuator captures a target object after being pressed, bent and deformed; the magnetorheological fluid is adsorbed in a flow channel of the flexible magnetorheological fluid damping cavity under the action of a magnetic field of the square electromagnet, so that the flow resistance of the magnetorheological fluid in the flexible magnetorheological fluid damping cavity is greatly increased, the clamping force of the flexible actuator is enhanced, and the situation that after the flexible actuator captures a target object, the clamping force is insufficient due to a complex environment, and the clamping force is not enough is avoided. And the object slides down.

The invention discloses a hydraulic oil cylinder with an axial supporting protection function, and belongs to the technical field of hydraulic cylinders, the hydraulic oil cylinder comprises an outer cylinder body, an oil cylinder rod and a first piston, a center oil cavity is formed in the outer cylinder body, the first piston is fixedly connected to the bottom of the oil cylinder rod, and the oil cylinder rod and the first piston are both slidably connected to the interior of the center oil cavity; a pressure buffering structure is connected into the outer cylinder body, when the oil cylinder rod bears pressure, the pressure buffering structure and the magnetic supporting structure are matched with each other to jointly share the pressure borne by the oil cylinder rod, a supporting rod in the magnetic supporting structure can transmit the pressure of the oil cylinder rod to a second piston, and therefore the oil cylinder rod is prevented from falling off. The second piston slides downwards in the storage cavity and extrudes the magnetorheological fluid, the stress of the oil cylinder rod is relieved through the buffering characteristic of the magnetorheological fluid, and therefore protection on the oil cylinder rod is effectively enhanced, and the stability and reliability of the hydraulic oil cylinder under the pressure effect are improved.

The invention relates to the technical field of exoskeleton robots, in particular to an exoskeleton driving system with multi-mode torque coupling and intelligent-brain cooperative control, which comprises a flexible torque coupling mechanism, a holographic intelligent-brain cooperative control strategy, an energy safety integrated shield module and an ultra-light integrated magic body structure, wherein the flexible torque coupling mechanism is used for adapting to power and flexibility of different scenes and carrying out torque output and rigidity continuous adjustment; a holographic intelligent brain cooperative control strategy is fused with perception information, data are analyzed through quantum federal learning and a bionic algorithm, torque is optimized, and cooperative control is carried out; the energy and safety integrated shield module is used for constructing a double-safety system, and recycling is achieved through magnetorheological fluid kinetic energy recovery and shape memory alloy potential energy storage. The ultra-light integrated magic body structure is matched with the human body size to adjust the exoskeleton, and the man-machine cooperation response is improved through the composite carbon fiber material and the highly integrated design. Therefore, the problems of high energy consumption, complex mechanical structure, insufficient stability and the like in the prior art are solved.

The utility model provides a scheme of a three-plunger digital displacement pump based on a dynamic coupling actuating valve, which comprises three groups of flow distribution units, and each group of flow distribution units comprises a reciprocating plunger and two high-speed switch valves. The plungers are connected to the crankshaft through the connecting rods, in the rotating process of the crankshaft, the 120-degree phase difference is kept between the plungers, electrical energy consumption and throttling loss in the control process can be reduced, and the multi-plunger digital displacement pump can be expanded in the crankshaft direction according to requirements. The valve element of the check cartridge valve structure is lighter, and the switch valve has higher rated flow. The topological structure of the coupling iron core can significantly improve the transient mechanical property of the dynamic coupling actuator, and significantly reduces the operation time of the switching valve. A dynamic sealing system is converted into a static sealing system through the thin film sealing structure, the situation that magnetorheological fluid leaks and pollutes a hydraulic oil way can be completely avoided, and the motion resistance of the system is reduced.

The invention relates to the field of machining equipment, and discloses a pressing device for machining and manufacturing, the pressing device comprises a base and a clamp mechanism, a linkage system driven by a hydraulic rod is arranged in the middle of the base in a hollowed-out mode, and a four-direction clamping structure is formed by a fixed clamping piece, an opposite moving clamping piece and linkage clamping pieces on the two sides. The outer layer is an ultra-high molecular weight polyethylene fiber woven layer, the middle layer is a shear thickening gel layer, the inner layer is an electromagnetically-controllable magnetorheological fluid cavity, and the electromagnetic coils distributed on the two sides of the clamping piece are matched, so that continuous adjustment of the contact rigidity from flexible attachment to rigid locking is achieved. The device is integrated with an energy recovery system, a lead zirconate titanate piezoelectric plate is arranged on a sliding rail at the top of a clamping piece, machining vibration energy is converted into electric energy to be stored in a bottom lithium battery, and power is supplied to an electromagnetic system to form an energy closed loop. The device breaks through the form limitation of a traditional clamp, can adapt to most special-shaped workpiece contours, meanwhile, has the functions of utilizing kinetic energy and reducing energy consumption, can meet the daily use requirement, and has commercial prospects.

The invention relates to the technical field of cycloidal speed reducers, in particular to an improved rack type cycloidal speed reducer which comprises a vibration reduction mechanism, the vibration reduction mechanism comprises a liquid bag used for vibration reduction, the liquid bag is filled with magnetorheological fluid, the bottom end of the liquid bag is fixedly connected with an N-stage electromagnetic plate, the top end of the liquid bag is fixedly connected with an S-stage electromagnetic plate, and the N-stage electromagnetic plate is fixedly connected with the S-stage electromagnetic plate. The vibration reduction mechanism further comprises a first piezoelectric ceramic piece, a second piezoelectric ceramic piece and a vibration reduction auxiliary mechanism, the first piezoelectric ceramic piece and the second piezoelectric ceramic piece are used for detecting vibration, and the vibration reduction auxiliary mechanism assists vibration reduction in a self-adaptive mode through friction force. The vibration reduction mechanism detects vibration and generates electric signals through a first piezoelectric ceramic piece and a second piezoelectric ceramic piece, then the generated electric signals are transmitted into a PLC, then the PLC controls currents introduced into an N-stage electromagnetic plate and an S-stage electromagnetic plate so as to control the size of a magnetic field, and the magnetic field intensity applied to magnetorheological fluid is adjusted, so that the vibration reduction effect is achieved. The viscosity and the rigidity can be changed in real time.

The invention relates to the technical field of semiconductors, in particular to a device and a method for automatically adjusting the depth of a groove of a 12-inch wafer polishing pan head, and aims to solve the problem that in the prior art, due to fluctuation of the initial thickness of a to-be-processed wafer, the thickness of the to-be-processed wafer is influenced. The polishing process adaptability is poor; the production efficiency is low; and the consistency of the polishing quality is difficult to control. The device comprises an online thickness measuring module, an adjustable groove polishing head module and a system control unit. The polishing head module is internally provided with a flexible hinge coupling type annular segmented array, a micro-drive actuator, a displacement sensing feedback network and a magnetorheological fluid damping locking system. According to the method, the initial thickness of a wafer is measured in a high-precision mode, the depth of a groove is calculated and adjusted in a feedforward mode, accurate execution and locking are achieved, and collaborative polishing and process dynamic compensation are carried out. According to the invention, accurate, rapid and spatially distinguished automatic adjustment of the groove depth of each wafer can be realized, and the automation level, the processing efficiency and the product quality of the polishing process are remarkably improved.

The invention discloses a large-torque magnetorheological brake based on a magnetorheological fluid internal circulation mode, and relates to the field of brakes, the large-torque magnetorheological brake comprises a shell, a left end cover, a right end cover, a main shaft and a rotating cylinder; a brake disc assembly is arranged on the rotating cylinder and comprises an end brake disc arranged at the position, close to the left end cover, of the rotating cylinder and a plurality of conventional brake discs arranged on the rotating cylinder at uniform intervals. A reel assembly is arranged on the periphery of the brake disc assembly in the shell, and a magnet exciting coil used for generating an exciting magnetic field is arranged on the reel assembly; an impeller is arranged on the main shaft, the impeller can move between the left end cover and the end brake disc, the impeller and the end brake disc are elastically connected, and the impeller can be attracted by electromagnetic force to move towards the end brake disc and rotate in cooperation with the end brake disc; the rotating impeller drives the magnetorheological fluid to circularly flow to a certain extent in the brake, and meanwhile the damping torque generated in the rotating process of the impeller can improve the braking torque of a system.

The invention discloses a support installation angle measuring device for photovoltaic power generation, which relates to the technical field of measurement and comprises an installation position structure, a magnetic field control assembly and a measuring assembly. The installation position structure is arranged at the connection position of a stand column and a cross beam of the photovoltaic support, the connection point of an inclined supporting rod and a main frame and the connection area of a base and a foundation, under the cooperation of the magnetorheological fluid cavity assembly and the magnetic field control assembly and the design of a spiral flow guide groove and a cone frustum cavity, the fluid distribution uniformity is improved, and under the action of a magnetic field, the fluid distribution uniformity is improved. The spiral flow guide grooves guide the magnetorheological fluid to form spiral flow and cooperate with a rotating magnetic field, the support fixing effect is remarkably enhanced, and when the support deviates due to external force, the micro stress sensor of the magnetorheological fluid cavity reversely deduces the angle through shear stress changes and feeds the angle back to the magnetic field control assembly for real-time correction. Therefore, stress is released and deformation is corrected under extreme working conditions such as strong wind and earthquakes, and the accuracy and response speed of angle control and measurement of the support are greatly improved.