35results about How to "Change the stiffness" patented technology

The invention relates to a high-static low-dynamic bionic vibration isolation system with adjustable mechanical properties, and belongs to the technical field of floating slab vibration isolators, the high-static low-dynamic bionic vibration isolation system comprises a bearing frame, a linear damping assembly and two frog leg bionic damping assemblies, the bearing frame comprises a top plate, a middle plate, a bottom plate and two guide rods, the top plate, the middle plate and the bottom plate are sequentially distributed at intervals from top to bottom. Guide holes are formed in the positions, close to the two ends, of the middle plate. The two guide rods movably penetrate through the two guide holes respectively, the top ends of the guide rods are fixed to the top plate, and the bottom ends of the guide rods are fixed to the middle plate. The two ends of the linear damping assembly are fixed to the middle plate and the top plate correspondingly. The two ends of the two frog leg bionic damping assemblies are fixed to the middle plate and the bottom plate respectively. When the bearing frame is excited by external force, the linear damping assemblies can continuously transmit the force excitation to the frog leg bionic damping assemblies on the lower layer, and the frog leg bionic damping assemblies have the mechanical property of dynamic stiffness gradual quasi-zero and can show good vibration isolation performance and bearing capacity.

The invention discloses an induction power generation and frequency modulation vibration reduction integrated ballastless track vibration reduction structure, and belongs to the technical field of track traffic. A track plate and a base plate are longitudinally laid along a track line, and the track plate is located above the base plate; the adjusting layer is arranged between the track plate and the base plate; an elastic vibration reduction layer is arranged between the base plate and the piezoelectric device layer, and the elastic vibration reduction layer is filled in a limiting structure in the base plate; a silicon steel sheet iron core structure of an electromagnetic coil is arranged in the elastic vibration reduction layer in the limiting structure; the piezoelectric device layer is located between the adjusting layer and the base plate and connected with the electromagnetic coil through a wire. The piezoelectric material and the magneto-rheological elastomer material are adopted, integration of induction power generation and frequency modulation vibration reduction is achieved, when the pressure is not enough to enable the piezoelectric device to output current, the magneto-rheological elastomer material still has the mechanical property of a common rubber elastomer, the whole structure still can guarantee the vibration reduction function, and meanwhile power-off protection is achieved.

The invention provides an electrorheological damping aircraft nose landing gear and an aircraft. The landing gear comprises a damping cylinder body; one end of the piston rod is slidably arranged in the damping cylinder, the other end of the piston rod is connected with an aircraft wheel, and a supporting shoulder is arranged in the middle of the piston rod; the electrorheological damping assembly comprises a plurality of electrorheological damping units which are stacked on the supporting shoulder; each electrorheological damping unit comprises electrorheological elastomers, a first electrode plate and a second electrode plate, and the adjacent electrorheological elastomers share one electrode plate; each first electrode plate is arranged on the inner wall of the damping cylinder body through a first insulating snap ring seat, and the end away from the snap ring seat is in sliding contact with the outer wall of the piston rod; each second electrode plate is arranged on the outer wall of the piston rod through a second insulating snap ring seat, and the end away from the snap ring seat is slidably contacted with the inner wall of the damping cylinder body; the power supply and the two electrodes are electrically connected with the piston rod and the damping cylinder body respectively to form a conductive loop; the rigidity can be adjusted in a self-adaptive mode, and the stability and comfort of aircraft operation are improved.

The invention relates to the technical field of vehicles, in particular to an air spring rigidity adjusting system and a vehicle. The air spring rigidity adjusting system comprises two air spring sets which are oppositely arranged on the two sides of the vehicle, and each air spring set comprises at least one air spring. The air storage device comprises at least two air storage cylinders, and the air springs are connected with the air storage cylinders through air paths; the valve group comprises a plurality of valves, and the plurality of valves are respectively arranged in the gas path; the air spring is used for being communicated with different air storage cylinders through opening and closing of the multiple valves. The air springs are communicated with the air storage cylinders with different volumes to adjust the rigidity of the air springs, so that the rigidity of the air springs on the two sides of the vehicle can be changed, the rigidity of the air springs on the two sides of the vehicle can be switched in real time according to the driving condition of the vehicle during driving, and the vehicle obtains excellent stability and trafficability.

The invention relates to a six-degree-of-freedom underactuated parallel variable-stiffness platform which mainly structurally comprises a six-degree-of-freedom industrial robot and a parallel variable-stiffness robot, and the parallel variable-stiffness robot is mainly composed of a lead screw sliding block linear actuator, a variable-stiffness branch chain, a fixed bottom plate, a movable platform and a baffle. Wherein the three lead screw sliding block linear actuators and the three variable stiffness branched chains are core mechanisms. Movement of the six-degree-of-freedom underactuated parallel variable-stiffness platform is achieved through large structural deflection of the flexible connecting rods, and due to passive Cartesian flexibility generated by inherent elasticity of the flexible connecting rods, contact stiffness can be changed, so that contact force is reduced, assembly deviation is treated in time, and the service life of the six-degree-of-freedom underactuated parallel variable-stiffness platform is prolonged. Reliable multi-task assembly tasks of the robot are efficiently completed, a robot controller adopts a rigidity / motion hybrid control method, expected force can be obtained, and expected directional deformation is achieved.

The invention provides a hydraulic spring auxiliary vibration device for linear friction welding, which comprises an electro-hydraulic excitation system and a vibration platform, the vibration platform is used for clamping a workpiece to be welded, the electro-hydraulic excitation system is used for applying linear reciprocating motion to the workpiece to be welded, and the hydraulic spring auxiliary vibration device is characterized by further comprising a hydraulic spring, the hydraulic spring is located below the vibration platform, a piston rod is arranged in the hydraulic spring, one end of the piston rod makes contact with the vibration platform, and the piston rod does linear reciprocating motion under the action of the vibration platform; elastic dampers acting on the two sides of the piston rod are arranged in the hydraulic spring and used for widening the excitation frequency of the electro-hydraulic excitation system. By changing the rigidity of the system, the resonant frequency of the linear friction welding electro-hydraulic excitation system is widened, the tracking control performance of the electro-hydraulic excitation system is improved, and it is guaranteed that the linear friction welding performance is more reliable.

The present invention discloses a flexible arm with variable stiffness, comprising an annular outer enclosure and a conducting wire, flexible arm ends are respectively arranged at both ends of the annular outer enclosure, the annular outer enclosure is made of a flexible material, the annular outer enclosure and the flexible arm ends are enclosed together to form a filling space, and the conducting wire passes through the filling space; a pull rope assembly is arranged between the flexible arm ends at both ends, and the pull rope assembly is used to limit the distance between the flexible arm ends at both ends; the filling space is filled with particles, and a trachea joint is arranged on one of the flexible arm ends; the vacuum degree in the filling space is adjusted by the trachea joint to change the extrusion force between the plate particles, thereby adjusting the stiffness of the flexible arm. The present invention can effectively adjust the overall stiffness of the flexible arm by adjusting the vacuum degree in the filling space, and realize the stepless adjustment of the stiffness of the flexible arm, so as to meet the stiffness requirements of the flexible arm in various different scenarios, and improve its applicability in multiple fields.

The invention relates to a carbon fiber reinforced resin-based composite corrugated sandwich pipe structure and a forming process, and relates to the field of composites.The carbon fiber reinforced resin-based composite corrugated sandwich pipe structure comprises an inner pipe, a corrugated pipe, a filling layer, an outer pipe and reinforcing rings, the corrugated pipe with the corrugated cross section is bonded outside the inner pipe, the outer pipe is bonded outside the corrugated pipe, the filling layer is injected into the space between the corrugated pipe and the outer pipe, and the reinforcing rings are arranged on the outer pipe. The corrugated pipe is divided into multiple sections in the length direction of the pipeline, and the reinforcing rings are bonded between every two adjacent corrugated pipe sections and fixedly connected with the inner pipe and the outer pipe. The high-rigidity corrugated sandwich pipe has the advantage that the high-rigidity corrugated sandwich pipe is low in forming difficulty.

The vibration damping system of the steering wheel is used for damping vibration of a bridge plate installed on a hub of the steering wheel and comprises a fastening piece, an elastic body, a supporting piece and a bias piece, the elastic body comprises a cylindrical base portion arranged in an installation hole of the bridge plate, a first limiting portion and a second limiting portion, and the first limiting portion and the second limiting portion are clamped on the two sides of the bridge plate. A first notch is formed in the radial outer contour of the second limiting part and penetrates through the two end faces, in the thickness direction, of the second limiting part. The first notches are formed in the second limiting parts, the first axial protrusions are arranged on the radial supporting parts, located below the second limiting parts, of the supporting pieces, and when the bridge plate is stressed to move towards the hub, the first axial protrusions penetrate through the first notches to abut against the bridge plate and are inserted into the first notches, so that the rigidity of the elastic bodies can be changed, and the rigidity of the elastic bodies is changed. Therefore, the frequency of the elastomer is changed.

The utility model discloses a battery cell fixing device which comprises a first limiting frame, a second limiting frame, a clamping and pushing mechanism and a mounting frame movably connected with the second limiting frame, a first clamping surface is arranged on the second limiting frame, and a second clamping surface is arranged on the mounting frame; the clamping pushing mechanism pushes the first limiting frame, and the first limiting frame is matched with the first clamping surface for clamping, or the first limiting frame is matched with the second clamping surface for clamping; therefore, different types of battery cells can be clamped or released, and the wide applicability of the device is improved.

The present invention discloses a variable stiffness hand exoskeleton device based on antagonistic drive, comprising independent power mechanisms, support seats, spring-link composite transmission mechanisms and end finger sleeves connected to the power output end of the spring-link composite transmission mechanism for the index finger, middle finger, ring finger and little finger; the power mechanism drives the finger to rotate through the spring-link composite transmission mechanism; the end finger sleeve is fixed to the periphery of the end joint of the finger joint through a first elastic adjustment belt, and the end finger sleeve provides force feedback for the end of the finger joint under the power actuation of the connecting rod structure, the inner surface of the support seat is palm-shaped, and the back of the support seat is provided with a rotating support seat and a motor fixing seat; the motor group of the power mechanism is installed on the motor fixing seat; the present invention realizes independent control of joint angle and joint stiffness by imitating the behavior of biological joints. Through the feedforward algorithm, the device can realize the adjustment of joint stiffness without the need for feedback sensors, thereby reducing system complexity and cost, and improving reliability and practicality.

The invention discloses a method for planning a straight-line trajectory of a robot arm based on a five-segment S-shaped speed curve, and belongs to the field of robot arm control. The invention interpolates intermediate points of a straight-line trajectory whose speed presents a five-segment S-shaped speed curve changing over time under high rigidity, so that the robot arm can run at a safe speed and accurately reach a specified position while using high rigidity.

The present invention discloses a vibration isolation and vibration reduction support based on memory alloy, comprising a leaf spring group, an upper panel and a lower panel, wherein the leaf spring group is made of memory metal; when working, when the upper panel or the lower panel is under the vibration load, the relative vertical spacing between them will change, on the one hand, the memory alloy leaf spring group is compressed and deformed to absorb energy or recover to its original state to release energy, thus achieving the purpose of vibration isolation and vibration reduction by relying on the unique structure and material characteristics of the memory alloy leaf spring group, on the other hand, the memory alloy rope is also stretched or retracted with the alternating deformation of the memory alloy leaf spring group, and the structure and material function of the memory alloy rope provide greater hysteresis energy consumption and restoring force. The present invention can effectively resist vertical vibration, has good damping effect, strong energy consumption capacity, has extremely high reliability and stability when working for a long time, and can automatically recover after re-vibration without the need for additional reset device.

The present invention discloses a temperature-pressure integrated fiber grating sensor and a human sleep multi-vital sign monitoring system. The system comprises a mattress, a plurality of temperature-pressure integrated fiber grating sensors, a demodulator, and a host computer. The plurality of vital sign fiber grating sensors are fixedly arranged in a gap between a mattress and a bed net, and their depths are kept at the same horizontal plane. The plurality of vital sign fiber grating sensors are connected to the demodulator to transmit data to the host computer. The present invention identifies the pressure exerted on the sensor by detecting the wavelength of a fiber grating spectrum signal peak splitting point, identifies the ambient temperature of the sensor by detecting the center wavelength drift of the fiber grating spectrum signal, monitors the multi-vital sign information of the user in bed, including the respiratory rate, heart rate, and the state of falling out of bed, etc. The system has the advantages of simple structure, small size, anti-electromagnetic interference, low cost, etc.

The application discloses a piezoelectric driving mechanism bending deformation variable stiffness scanning probe, which comprises a base, a deformation mechanism and a probe needle, the deformation mechanism comprises two deformation units which are fixed in a stack, the deformation unit comprises a circular ring and at least three V-shaped cantilever beams, the at least three V-shaped cantilever beams are arranged in the circular ring, one end of the at least three V-shaped cantilever beams is connected with the circular ring, and the other end is connected with each other and the connection position is located at the center of the circular ring; piezoelectric driving units and strain sensing units are arranged between the V-shaped cantilever beams of the two deformation units, and all the piezoelectric driving units are connected in parallel; the circular rings of the two deformation units are fixedly connected with the base, and the probe needle is connected with the other end of the V-shaped cantilever beams. The application can realize the large-range variable stiffness of the scanning probe to adapt to different modulus surfaces while the static and dynamic performances of the scanning probe are considered.

The utility model relates to the technical field of medical equipment, and discloses an insertion tube and an endoscope, the insertion tube comprises a support part, the support part is matched with an operation unit, a working cavity is formed in the support part, the support part comprises a first support layer and a second support layer which are arranged from inside to outside, and the second support layer comprises a first support section and a second support section; the second supporting layer is arranged outside the first supporting layer, the rigidity of the first supporting layer in the length direction of the first supporting layer is different, the rigidity of the second supporting layer is of a two-section type, and the overall rigidity of the supporting part has the trend of gradually decreasing in the direction away from the operation unit. The supporting performance is better while the requirement for the rigidity of the insert tube is met, the first supporting layer, the second supporting layer and the wrapping part are directly assembled when the insert tube is manufactured, and the rigidity of the insert tube can be effectively changed without a multi-layer extrusion process.

The invention provides a resonator and electronic equipment, and relates to the technical field of resonance. The resonator provided by the invention comprises a substrate, the substrate is provided with at least two cantilever beams, the two cantilever beams are symmetrically arranged relative to the center of the substrate, and each cantilever beam is provided with a first hole. The resonator structure provided by the invention is small in size, can excite the in-plane mode and the out-of-plane mode, and can achieve the switching of the two modes.

The present invention provides a vibration reduction device and a refrigeration system. The vibration reduction device includes a vibration reduction part, which is used to be installed between the device to be vibration reduced and a base to reduce vibration of the device to be vibration reduced; the vibration reduction part includes: a vibration reduction part body, which has a plurality of accommodating cavities; a magnetorheological fluid, each accommodating cavity is filled with a magnetorheological fluid; a coil, which is connected to the vibration reduction part body, and each accommodating cavity is wound with a coil around the circumference of each accommodating cavity, so as to adjust the stiffness of the magnetorheological fluid in the corresponding accommodating cavity through the coil. The technical solution of the present invention solves the problem of poor vibration reduction effect of the vibration reduction device in the prior art.

This utility model belongs to the technical field of shock absorbers, and provides a sheet-type shock-absorbing rubber component, including a double-ended screw, an upper connecting plate and a lower connecting plate respectively sleeved at the upper and lower ends of the double-ended screw, a sheet-type composite shock-absorbing mechanism sleeved in the middle of the double-ended screw and located between the upper and lower connecting plates, and adjusting nuts disposed at the upper and lower ends of the double-ended screw and located outside the upper and lower connecting plates respectively. This utility model includes a double-ended screw, upper and lower connecting plates, a sheet-type composite shock-absorbing mechanism, and adjusting nuts. The sheet-type composite shock-absorbing mechanism achieves an asymmetrical stiffness structure through a layered design, resulting in a compact structure and excellent shock absorption effect. Simultaneously, by rotating the adjusting nut, the compression of the multi-layer shock-absorbing units can be controlled, thereby changing its overall stiffness and damping characteristics. Users can flexibly adjust it according to different loads and shock absorption requirements, greatly improving the product's applicability and practicality.

This invention provides an underwater bistable variable stiffness rigid-flexible coupled hydraulic mechanical gripper, belonging to the technical field of robot end effectors. This manipulator combines flexible fit with gripping stiffness and offers a fast response speed. The drive module, finger modules, transmission module, and variable stiffness module are all mounted on a support module. The output of the drive module is connected to each finger module via the transmission module, and the output of the variable stiffness module is connected to each finger module via the bistable module. The drive module's operation drives multiple finger modules to perform gripping actions through the transmission module, while the variable stiffness module's operation adjusts the structural stiffness of multiple finger modules through the bistable module. This mechanical gripper integrates the lossless compliance of soft actuation, the high-speed response of a bistable mechanism, and the strong load-bearing capacity of a rigid structure. It can stably grip objects of different masses and shapes in underwater environments, exhibiting strong adaptability and high operational efficiency.

The present invention provides a wind tunnel vibration test device suitable for high wind attack angles, belonging to the technical field of wind tunnel vibration test, comprising: a fixed bracket, a rotating bracket, an elastic stretching component, an elastic torsion component and a synchronous rotation driving mechanism, wherein two rotating brackets are symmetrically and rotationally mounted on the fixed bracket; a slide rail is provided on the rotating bracket, and a sliding block with sliding fit is provided on the slide rail; the two ends of the segment model to be measured for vibration are rotationally mounted on the two sliders, and the moving direction of the slider is perpendicular to the upper plane of the segment model; the elastic stretching component is correspondingly connected between the slider and the rotating bracket on the same side, and the telescopic direction of the elastic stretching component is consistent with the moving direction of the slider; the two elastic torsion components are connected between the two ends of the segment model and the slider on the same side; the synchronous rotation driving mechanism drives the rotating bracket, the elastic stretching component and the segment model to rotate synchronously. The present invention can improve the accuracy of the vibration measurement results of the segment model wind tunnel test, and has good versatility.

The invention relates to a flexible guide (1) for a rotating resonator mechanism, in particular for a watch movement, the guide (1) comprising a fixed support (2), a movable element (3) movable relative to the fixed support (2), at least one main flexible blade (4), the movable element (3) being allowed to move relative to the fixed support (2) with a rotational movement about a rotation center by bending the main flexible blade (4), the flexible guide (1) being arranged substantially in one plane and comprising at least a first translation stage (5) connected to one end of the main flexible blade (4), such that the first translation stage (5) is configured to move in translation at least partially under the influence of the bending of the main flexible blade (4), the flexible guide (1) comprising adjustment means for adjusting the stiffness of the first translation stage (5).

The present application relates to the technical fields of energy collection, and particularly relates to a electromagnetic-piezoelectric-friction composite energy collector for low-frequency vibration energy, which comprises an electromagnetic power generation unit, a piezoelectric power generation unit, a friction power generation unit and a tuning mechanism, the electromagnetic power generation unit comprises a coil, a rolling magnet, a center magnet and a return magnet, the coil is embedded in the lower surface of the upper shell and the upper surface of the lower shell in two layers, corresponding to the sweeping area of the rolling magnet and connected in series; the piezoelectric power generation unit comprises a contact piezoelectric module and a collision piezoelectric module, the contact piezoelectric module is a cantilever beam structure, the friction power generation unit comprises a friction layer arranged on the outer surface of the rolling magnet and multiple groups of electrodes; the present application solves the technical problems of single piezoelectric transduction mode, low control precision and complicated operation in the prior art.

The present invention relates to an air spring assembly control method and system, the air spring assembly control method comprising the following steps: obtaining the lateral acceleration of a vehicle, obtaining the braking deceleration of the vehicle; in response to the lateral acceleration of the vehicle being greater than or equal to a preset lateral acceleration threshold, controlling the isolation valve to close; in response to the braking deceleration of the vehicle being greater than or equal to a preset braking deceleration threshold, controlling the isolation valve to close; after controlling the isolation valve to close, obtaining the steering wheel angle and brake light state of the vehicle, in response to the steering wheel angle being less than a preset steering wheel angle threshold and the brake light state being closed, controlling the isolation valve to open. The air spring assembly control system comprises a controller and an air spring assembly. The present invention can quickly change the stiffness of the air spring assembly, the closing and opening of the isolation valve are respectively controlled by different signal judgments, which increases the degree of freedom of matching, and can also prevent the air spring assembly stiffness from suddenly changing when the isolation valve is opened, causing jitter.

The invention relates to a self-adaptive variable-rigidity sole based on a tensegrity structure and a control method thereof.The self-adaptive variable-rigidity sole comprises a tensegrity ankle joint which is used for being fixedly connected with the foot end of a quadruped robot and can achieve inward turning, outward turning, plantar flexion and dorsiflexion movement, and a self-adaptive variable-rigidity tensegrity sole part is installed on the lower side of the tensegrity ankle joint; and a silica gel sole is arranged at the bottom of the tensioning sole part. The self-adaptive variable-stiffness sole can adapt to and envelop a plurality of non-structural terrains, and the terrain trafficability of the foot type robot is enhanced.

This invention provides a transnasal interventional variable stiffness flexible bone-grinding robot and a stiffness control method, comprising a grinding mechanism, an inner arm drive mechanism, and an outer arm drive mechanism. The outer arm continuum of this application is composed of snake bone continuum units, which enable it to have both high flexibility and high stiffness. After the outer arm continuum enters the surgical cavity, it can provide a high-stiffness working space for the inner arm continuum and the drill bit. By simultaneously axially stretching / compressing the tendon, the compression or extension of the distal spring of the inner arm continuum can be controlled, thereby changing the stiffness of the distal end of the inner arm continuum. When feeding, the spring is stretched to reduce stiffness, making it more flexible and conducive to reaching the surgical area. When the grinding drill bit is working, the spring is compressed, making it have high stiffness so that it does not damage non-disease tissue when the drill bit grinds bone, realizing the function of adjustable stiffness, which is more conducive to the needs of surgical operation.

The invention provides a neck electrostatic protection device driven by friction high voltage. The neck electrostatic protection device comprises a power source, a friction power supply unit, a neckerchief body, a circuit management unit and a control unit. The friction power supply unit is driven by the power source to output high-voltage alternating current; the circuit management unit is connected between the friction power supply unit and the neckerchief body and outputs direct current needed for generating electrostatic adsorption; the neckerchief body comprises an electrostatic adsorption unit, and the electrostatic adsorption unit is composed of a plurality of first adsorption pieces and second adsorption pieces which are arranged in an array mode. The first adsorption pieces and the second adsorption pieces in the same row are sequentially and alternately arranged and overlapped, and every two adjacent adsorption pieces of the same kind in the same row and the same column do not make contact with each other. The first adsorption sheet and the second adsorption sheet which are overlapped generate an electrostatic adsorption effect under the driving of the direct current, so that the overall rigidity of the neckerchief body is changed, and the neck of a wearer is protected; the control unit is used for controlling the rotor rotating speed of the friction power supply unit and / or the direct current output by the circuit management unit.

The application relates to the technical field of vibration reduction, and discloses a control method for a vibration reduction device, which is applied to the vibration reduction device, the vibration reduction device being an inner-outer double-layer structure capable of being folded or unfolded; the stiffness of the vibration reduction device is different when the vibration reduction device is in a folded state or an unfolded state; the control method comprises the following steps: acquiring the operating frequency of a compressor; determining the target state of the vibration reduction device according to the operating frequency of the compressor; and controlling the operation of the vibration reduction device according to the target state. In this way, the stiffness of the vibration reduction device is changed by controlling the folding and unfolding of the vibration reduction device, and the modal frequency of the compressor is changed. Therefore, the compressor can be prevented from resonating, and the vibration reduction effect of the vibration reduction device on the compressor is improved. The application further discloses a control device for the vibration reduction device, an air conditioner and a storage medium.

The present application relates to the technical field of gas bearings, and provides a novel dual-rotation foil gas dynamic pressure bearing, comprising: a bearing sleeve, a foil, a top foil, a magnet, a retaining ring and a screw; the foil is connected by a plurality of "ZS"-shaped structures, and the "ZS"-shaped structures at the head and tail ends of the foil are nested and connected with each other. The "ZS"-shaped structures of the foil can expand and deform outwards after being stressed, and can automatically shrink after unloading, and have a certain support stiffness, and the sliding friction effect between the foil and the bearing sleeve provides damping for the bearing; the top foil is connected by a "triangular" support at the head and tail ends and a circular support. The arc surface is composed of a "triangle" support of the top foil nested in the "ZS" structure of the foil. After the foil is deformed, the "triangle" support pulls the arc surface of the top foil, and the top foil will slightly detach from the foil, changing the thickness and shape of the air film, which is beneficial to reducing the subsynchronous vibration of the rotor; the magnet is installed in the groove of the bearing sleeve, and the magnetic force acts on the foil to reduce the movement of the foil. When the foil moves, it cuts the magnetic flux lines generated by the magnet, generates eddy currents to consume energy, and provides damping for the bearing; the retaining ring is fixed to the bearing sleeve by screws to limit the axial movement of the foil and the top foil. This application has good stiffness and damping characteristics, allows the rotor to rotate in both directions, is simple in structure, does not require welding, and is easy to disassemble.

The utility model relates to the technical field of rehabilitation instruments, and discloses a limb rehabilitation training device with a variable stiffness function, which comprises a casing, a support frame is fixedly mounted in the casing, two pairs of bearing seats are fixedly mounted in the support frame, and rotating shafts are rotatably mounted in the bearing seats; a guide shaft support is rotationally mounted in the center of the supporting frame through a rotating seat, one end of a guide shaft is fixedly mounted in the guide shaft support, and the guide shaft is sleeved with a sliding block; the ends, away from each other, of the two rotating shafts on the upper side are each rotationally provided with one end of a swing rod, the other ends of the swing rods are fixedly provided with the same cross rod, the sliding blocks are provided with elastic pieces, and the supporting frame is provided with an adjusting assembly used for lifting the sliding blocks. The limb training rigidity of a patient can be changed, the structure is simple, work is stable, and therefore on the premise that man-machine interaction safety is guaranteed, the control accuracy of the training device can be kept accurate for a long time, and the device is more reliable in overall operation, longer in service life and better in durability.