31results about How to "Improve damping performance" patented technology

The present application belongs to the technical field of carbon fiber composite materials, and particularly relates to a carbon fiber composite material with high-frequency damping performance and a preparation method thereof. Through multi-component synergistic modification of an epoxy resin matrix, a nitrile rubber composition and a boron nitride composition, combined with carbon fiber surface treatment and a segmented curing process, a multi-scale damping energy dissipation network is constructed. The material exhibits excellent damping performance in a high-frequency vibration environment, while also having high mechanical strength and interfacial bonding force, which can significantly reduce the damage risk caused by vibration transmission of sports equipment, and is suitable for high-end sports equipment field, promoting the industrial application of carbon fiber composite materials in high-frequency damping scenarios.

The application discloses a liquid metal bearing for an X-ray tube and the X-ray tube, relates to the technical field of X-ray tubes, and solves the technical problems of short service life and poor heat dissipation effect of the bearing. The liquid metal supporting bearing comprises a bearing sleeve, a mandrel, liquid metal and a microporous structure; the bearing sleeve is sleeved outside the mandrel, and a gap is arranged between the bearing sleeve and the mandrel; the liquid metal is filled in the gap; the microporous structure is arranged on the inner surfaces opposite to each other of the bearing sleeve and the mandrel and / or the outer surfaces opposite to each other of the mandrel and the bearing sleeve, the microporous structure is formed by a plurality of micropores arranged in an array, and the microporous structure has a protruding direction consistent with the flowing direction of the liquid metal. The liquid metal distribution is optimized through the micropores and optional microslit structures between the bearing sleeve and the mandrel, the friction coefficient is reduced, the heat dissipation performance is enhanced, and the service life and the heat dissipation effect of the bearing can be remarkably improved.

This utility model relates to the field of piston surface grinding technology and discloses a high-precision grinding device for piston surfaces, including a U-shaped equipment frame, a first linear guide rail, and a second linear guide rail. Two slide rails are provided at the bottom of the inner cavity of the U-shaped equipment frame, and a fixing component is provided in the middle of the U-shaped equipment frame. A driving device is provided on each of the two second linear guide rails. A surface cleaning rod is fixedly connected to the output end of one of the driving devices. The fixing component includes a sleeve located at the bottom of the inner cavity of the U-shaped equipment frame. A piston block is provided in the middle of the inner cavity of the sleeve. A hydraulic groove is formed on the surface of the sleeve. An installation ring is fixedly connected to the bottom end of the sleeve, and a replacement head is fixedly connected to the middle of the installation ring. A sealing ring is fixedly connected to the inner wall of the replacement head. The device can be flexibly adjusted to adapt to the processing needs of various pistons, enabling rapid model changeover.

This utility model provides a pull-out dispensing medicine box, comprising: a through-wall box, the inside of which is divided into several compartments perpendicular to the through-wall, each compartment having a baffle protruding from its inner wall at both its front and rear ends; several inner boxes with openings at the top, each inner box correspondingly placed within a compartment, and each inner box having a baffle in the middle of its bottom. When the inner boxes are pulled out from the compartments, the baffle is blocked by the baffles. This pull-out dispensing medicine box features a simple structure, convenient and safe operation, and is waterproof and moisture-proof.

The invention relates to the technical field of ocean engineering, and particularly discloses an oscillating water column type wave energy breakwater integrated system based on a superstructure. The system comprises a breakwater carrier which is internally provided with a superstructure formed by a plurality of arc-shaped flow guide plates which are coaxially arranged. The superstructure divides the internal cavity of the carrier into a plurality of independent sector-ring-shaped cavities with different radial sizes. The top of each sector-ring-shaped cavity is provided with a cavity top plate and a vent hole, and the vent holes are connected with a turbine generator through pipelines. The breakwater carrier may be designed as a floating structure anchored by a mooring system or as a bottom-seated structure that is directly bottom-seated. Through the superstructure design, a plurality of oscillating water columns with different inherent frequencies can be excited in the system, so that efficient capture and conversion of broadband wave energy are realized. Meanwhile, the wave absorbing performance is effectively improved, and the wave load is remarkably reduced.

The application discloses a kind of natural rubber filling nickel-aluminum bimetallic hydroxide multi-walled carbon nanotube composite material for electronic component packaging, belong to packaging material technical field, the composite material includes natural rubber matrix and dispersed nickel-aluminum bimetallic hydroxide / multi-walled carbon nanotube hybrid filler, the hybrid filler is made of multi-walled carbon nanotube and nickel-aluminum layered double hydroxide grown in its surface in situ.Its preparation method is: multi-walled carbon nanotube, nickel source, aluminum source, urea and ammonium fluoride are dissolved in water and prepared hybrid filler by hydrothermal reaction;Then it is mixed with natural latex, vulcanization aid dispersion, freeze-drying, vulcanization is obtained.The application improves the dispersibility of filler by constructing LDH / MWCNT hybrid structure, uses phonon transmission optimization, synergism of loss and impedance, combustion inhibition and the friction and reinforcing mechanism of hybrid filler and natural rubber molecular chain, so that the thermal conductivity, electromagnetic wave absorption capacity, flame retardancy, mechanics and damping performance of the composite material are simultaneously improved, suitable for electronic component packaging field.

This application discloses a high-efficiency five-axis machining center, relating to the field of CNC machine tools. It includes a base and a worktable, with two support seats mounted on the base. A transverse slide is slidably connected to each of the two support seats, and a positioning seat is provided on each support seat. An inclined surface is formed on the side of the positioning seat near the transverse slide, and a transverse stator is mounted on the inclined surface. Transverse movers are mounted on both sides of the transverse slide. A longitudinal slide is slidably connected to the transverse slide, with a row of longitudinal stators mounted on the transverse slide and longitudinal movers mounted on the longitudinal slide. A vertical drive seat is slidably connected to the longitudinal slide, and a vertical drive cavity is formed on the vertical drive cavity. A vertical drive component is installed within the vertical drive cavity, and one end of the vertical drive component is rotatably connected to a first drive screw. This application aims to disperse the upward shearing force generated during cutting, improve the stability of the transverse slide movement, and enhance product machining accuracy and processing effect.

The invention relates to the technical field of water conservancy automation control and edge computing, in particular to a self-adaptive PID control system for a water conservancy reservoir environment, which comprises an edge computing gateway, a water level sensor, a flow sensor and a servo execution mechanism, fluid static geometric parameters are obtained through a topological mapping module, an initial state matrix of a fluid momentum state observer is established, a momentum decoupling module inputs a dam front water level, upstream incoming water flow and opening data to update the state matrix, and transient fluctuation energy characteristics and real reserve residual characteristics are generated through decoupling. The priori fitting module calculates proportion, integral and differential coefficients according to the parameters, and the closed-loop evolution module generates a control instruction and corrects bottom resistance parameters; physical separation of real reservoir capacity change and surface wave disturbance is achieved, invalid oscillation of the gate is reduced, control stability under the flood peak working condition is improved, and the service life of an executing mechanism is prolonged.

The utility model relates to a low-voltage switch cabinet body. The technical problem to be solved by the utility model is to provide a low-voltage switch cabinet body. According to the technical scheme, the switch cabinet comprises a switch cabinet frame, a switch cabinet installation beam, a circuit breaker positioning assembly and a circuit breaker, a circuit breaker clamping groove is formed in the bottom of the circuit breaker, the circuit breaker positioning assembly comprises a circuit breaker bearing mainboard, a circuit breaker clamping plate, a clamping plate limiting assembly and a buffer spring, the circuit breaker clamping plate comprises a clamping plate U-shaped part, and the clamping plate U-shaped part is connected with the circuit breaker bearing mainboard. The two ends of the clamping plate U-shaped part are sequentially and vertically bent to form a clamping plate attaching part and a clamping plate clamping part, and clamping plate limiting openings are formed in the left side and the right side of the clamping plate U-shaped part. The utility model has the advantages that the unthreaded connection of the circuit breaker is realized through the interaction of the circuit breaker clamping plate and the clamping plate limiting assembly, the connection is firm and reliable, the installation and the disassembly are more convenient, and the later maintenance is facilitated; the buffer spring can improve the anti-vibration capability after the circuit breaker is installed, the vibration buffering effect is good, and the service life of the circuit breaker is effectively prolonged.

The application relates to the technical field of structural engineering, in particular to a built-in negative stiffness damper system for controlling in-plane and out-of-plane vibration of a cable, which is used for controlling the vibration of a cable body and comprises a stand, a cross beam, a negative stiffness device, a damper and a connecting rod, the cross beam is arranged above the stand, a first hole is arranged at the top end of the stand away from the stand, the damper is arranged on the side of the cross beam away from the stand and is connected with the cable body, the damper is symmetrically arranged along the vertical plane where the cable body is located, and the negative stiffness device is arranged inside the hollow cross beam and is connected with the cable body through the connecting rod. The built-in negative stiffness damper system for controlling in-plane and out-of-plane vibration of the cable can provide negative stiffness and damping effects when the cable vibrates in the in-plane and out-of-plane directions.

The present application provides a kind of sound box's shockproof structure, it includes shockproof locking part, elastic arm and sound box assembly part.Shockproof locking part includes locking hole;Elastic arm is arranged in shockproof locking part;Sound box assembly part is arranged in elastic arm, and shockproof locking part and sound box assembly part are respectively arranged in two ends of elastic arm.Thereby, the present application can assemble shockproof locking part in electronic product, and assemble sound box assembly part in sound box, so that elastic arm is located between sound box and electronic product, and by elastic arm as the buffer and adjustment when sound box resonance, to avoid the vibration of sound box to be conducted to electronic product and produce abnormal sound, and achieve the effect of improving shockproof.

The utility model relates to the technical field of noise reduction devices, in particular to a noise reduction device for bearing machining, which comprises a noise reduction pad and anti-skid particles, the anti-skid particles are fixedly connected to the lower side of the noise reduction pad, a vibration and noise reduction mechanism is arranged on the inner side of the noise reduction pad, the vibration and noise reduction mechanism comprises a fixed cylinder, and the inner side of the fixed cylinder is tightly attached to a rubber ring sleeve. A movable bearing table is slidably connected to the inner side of the rubber ring sleeve, a piston sleeve sleeves the outer side of the movable bearing table, the lower side of the piston sleeve is tightly attached to the upper end of the noise reduction spring, a connecting through hole is formed in the inner side of the side edge of the lower end of the fixing cylinder, and a damping vibration attenuation assembly is fixedly connected to the outer side of the fixing cylinder and comprises a communicating pipe; according to the multi-layer structure design and the hydraulic damping principle, effective buffering of mechanical vibration and remarkable reduction of noise are achieved, and the vibration reduction and noise reduction performance and stability of the device are further enhanced through structural optimization and detailed design of each further-implemented scheme.

This utility model discloses an amorphous alloy three-dimensional wound core transformer, including an oil tank and a transformer body. A first sound-absorbing component is fixed on the inner wall of the oil tank. The transformer body includes a vibration damping mechanism, a clamping frame mechanism fixed on top of the vibration damping mechanism, a second sound-absorbing component fixed on the outer surface of the clamping frame mechanism, an amorphous alloy three-dimensional wound core mounted on the clamping frame mechanism via a pad mechanism, and coil windings wound on the amorphous alloy three-dimensional wound core. This utility model uses a structure in which the clamping frame mechanism and the pad mechanism cooperate to fix the position of the amorphous alloy three-dimensional wound core and the coil windings. The fixing method is stable, and the amorphous alloy three-dimensional wound core is suspended as a whole, avoiding direct transmission of vibration energy to the oil tank, which can reduce noise. Furthermore, this utility model also includes a vibration damping mechanism, a first sound-absorbing component, and a second sound-absorbing component, which can further reduce noise. This utility model is suitable for use as basic equipment for power transmission and distribution.

The invention relates to the technical field of inductance devices, in particular to an automatic winding device for inductance coil production and manufacturing, which comprises a frame, an active pay-off rack and an automatic winding mechanism, the active pay-off rack and the automatic winding mechanism are both mounted on the frame, and the automatic winding device further comprises a winding mechanism, and the tension control system is arranged on the frame between the active pay-off rack and the automatic winding mechanism and is used for stably adjusting the tension of the metal wire. The tension adjusting device has the effect of stably adjusting the tension of the metal wire.

The utility model discloses a fuel pressure pulsation damper, wherein, including: fuel chamber is installed in pressure regulating chamber, fuel chamber and pressure regulating chamber intercommunication, fuel chamber is equipped with fuel inlet, and pressure regulating chamber is equipped with fuel outlet, the junction of fuel chamber and pressure regulating chamber is outwardly protruding and is equipped with installation cavity, one end of elastic component is installed in pressure regulating chamber, the other end of elastic component is installed in sealing component, and the outer wall of sealing component is on installation cavity, sealing component is equipped with through -hole, and elastic component is equipped with communicating hole, fuel inlet, fuel chamber, through -hole, communicating hole, pressure regulating chamber and fuel outlet are communicated in proper order. Through the application of the utility model, a kind of fuel pressure pulsation damper is provided, the device simple structure can be directly installed in pipeline, and sealing component in the device can absorb part of energy in the process of oil flow, thereby relieving pressure pulsation in management, and there is better damping effect.

The invention relates to the technical field of damping materials, in particular to a core-shell structure foaming agent with ammonium bicarbonate coated with nano-silica and a water-based damping coating prepared from the core-shell structure foaming agent. The foaming agent with the core-shell structure is prepared from the following raw materials in parts by weight: 8-10 parts of nano silicon dioxide, 2-5 parts of ammonium bicarbonate, 1-3 parts of diatomite, 1-2 parts of a coupling agent, 0.5-1 part of polyvinylpyrrolidone, 0.5-1 part of epoxy chloropropane and 7-12 parts of absolute ethyl alcohol. The foaming agent with the core-shell structure realizes controllable thermal decomposition through a synergistic effect of chemical bonding and physical adsorption, and the water-based damping paint prepared by utilizing the foaming agent effectively avoids the defects of bubbles, pinholes or cracks and the like caused by concentrated release of gas in a film forming process of a coating due to a controllable and stable gas release mechanism; the high-quality coating which is smooth and compact in surface, free of bubble marks and excellent in damping vibration attenuation effect is obtained, and it is hopeful to achieve the same or better vibration attenuation effect by reducing the overall using amount of materials.

The utility model relates to rubber support technical field discloses a rubber support under the working condition of offshore drilling platform, including composite rubber body and the steel bottom plate of setting at the bottom of composite rubber body, the stainless steel framework is alternately overlapped and arranged in the composite rubber body, the stainless steel framework is overlapped and is composed by a plurality of thin steel sheets, the stainless steel framework is formed 10um ceramic membrane through micro -arc oxidation treatment, and fills the nanometer sealing agent in ceramic membrane, the composite rubber body includes the surface layer, the middle layer and the core layer that set up in proper order, the surface layer is made of hydrogenated nitrile rubber, the middle layer is made of fluorine rubber, and is connected through vulcanization bond with the surface layer, the core layer is made of high damping natural rubber, is closely combined with the middle layer through hot vulcanization process, and the whole forms co -vulcanization integrated structure.

The invention relates to the technical field of steel wire tension control, in particular to a constant tension control device for releasing a steel wire, which comprises a wire coil and an oil cylinder coaxially positioned in the wire coil and relatively fixed, fluid is stored in the oil cylinder, a plurality of damping bodies are arranged in the oil cylinder along the axis direction of the oil cylinder, and the damping bodies are connected with the wire coil. The damping body is used for limiting the rotating speed of the wire coil; the flow limiting channel is used for limiting the flow of fluid, so that the movement speed of the rotating shaft and the fan plate is limited, damping force is provided for the wire coil, the speed of releasing a steel wire by the wire coil and the tension of the steel wire are conveniently controlled, the abrasion phenomenon of a friction plate in a traditional mode can be avoided, and stable damping force is conveniently provided for the wire coil; meanwhile, when the steel wire releasing speed is increased, the fluid flow speed is increased, and the reverse limitation of the flow limiting channel on the fluid is enhanced, so that the damping effect on the wire coil is enhanced, and the steel wire releasing speed of the wire coil is always kept within a specified range.

A continuously variable differential gear comprising: a pair of rotating bevel gears engaged with one another via a pinion gear, each of the bevel gears including a first operating surface; an actuator, opposing ends thereof having a pair of interconnected fluid reservoirs, the actuator comprising a pair of secondary operating surfaces; the pair of rotating gears and the pinion gear being housed within the actuator such that the first operating surfaces of the bevel gears and the secondary operating surfaces of the actuator are cooperatively engaged, wherein relative rotation between the pair of bevel gears imparts a linear motion to the actuator thereby varying the pressure between the pair of interconnected fluid reservoirs to resist the linear motion of the actuator and thereby variably dampen relative motion of the bevel gears to each other.

The utility model relates to a pressing device, which comprises a hollow pipe body, a hook seat, a pressing part, a pressing part and a pressing part, and is characterized in that the pipe body is internally provided with a hook seat at one end; the machine core is arranged inside the tube body, the machine core is provided with a groove, the groove is provided with a first end and a second end, the outer diameter of the first end is gradually increased towards the outer diameter of the second end, the two ends of the machine core are respectively provided with a clamping groove and a rod body, and the hook part of the hook seat can be clamped in or separated from the clamping groove of the machine core; the rubber sleeve is arranged in the groove, the rubber sleeve can move along the groove, and the rubber sleeve is provided with an annular part; and the elastic piece is arranged between the hook seat and the movement, and the elastic piece is respectively connected with the hook seat and the movement.

The application discloses a kind of low modulus silicone rubber based on topological network regulation and its preparation method and application, belong to room temperature vulcanized silicone rubber technical field.It includes component A, component B and component C;The A component, by weight fraction, includes tetraethenyl terminated polysiloxane 100 parts, white carbon black 10-50 parts, platinum catalyst 0.01-0.5 parts;The B component, by weight fraction, includes end hydrogen silicone oil 3-50 parts, tetraethenyl terminated polysiloxane 50-97 parts, white carbon black 10-50 parts, inhibitor 0.01-0.5 parts;The C component, by weight fraction, includes hydrogen-containing silicone resin 0-30 parts.The application controls the topological network of silicone rubber, reduces its modulus at the same time, makes it have better mechanical properties and damping performance, realizes the synergistic optimization of comprehensive performance.

The utility model relates to building template technical field, proposes a kind of building template for concrete building, gradient vibration-suppression hole structure is constructed inside the core layer of damping layer, wherein relatively dense structure, to enhance the reflection and scattering effect of high-frequency vibration, wherein loose structure is conducive to absorption and dissipation low-frequency vibration energy, by controlling the gradient change of pore, realize the efficient suppression of different frequency vibration, set up spiral special-shaped hole in the damping layer, compared with traditional circular hole, can increase the path length and reflection times of vibration wave inside the propagation of damping material, when vibration wave propagates along spiral hole, will constantly occur reflection and refraction, thereby more vibration energy is converted into heat energy and other forms of energy and dissipates, simultaneously the existence of special-shaped hole can also enhance the interaction of damping material and air, further improve damping effect.

The application provides an oil-gas suspension cylinder, an oil-gas suspension system and a vehicle, and belongs to the technical field of vehicles.The oil-gas suspension cylinder comprises a cylinder barrel which is a hollow cavity with openings at both ends, two piston rods with different cross-sectional areas are arranged at both ends of the cylinder barrel, a partition plate is arranged in the cylinder barrel, the partition plate divides the inside of the cylinder barrel into two independent first chambers, and the two piston rods are arranged in the two independent first chambers respectively; a second chamber and a fixed damper are arranged on the piston rod, and the fixed damper enables the second chamber to communicate with the first chamber. The double-piston rod with different cross-sectional areas is arranged, the large-diameter end is used as a heavy-load piston rod, and the small-diameter end is used as an empty-load piston rod; the empty-load piston rod can improve the pressure during empty-load operation due to the small cross-sectional area, so that the pressure is greater than the starting pressure of the suspension cylinder, the suspension cylinder is convenient to debug, and the problem that the diameter is too large due to the design according to the full-load load, resulting in extremely low empty-load pressure is solved.

The application provides an electromagnetic valve driving mechanism and a damping shock absorber, which comprises a armature, an elastic element and a mounting base which are sequentially sleeved outside a push rod; one end of the elastic element acts on the armature, and the other end acts on the mounting base; the elastic element generates an axial elastic force on the armature and the mounting base; when the push rod and the armature move together in the axial direction towards the mounting base to drive the hydraulic element, the elastic element will generate a reverse force, so that the armature and the push rod will not suddenly move downward, the initial force of the armature and the push rod on the hydraulic element is relatively gentle, the electromagnetic valve is prevented from suddenly starting, the probability of violent collision of the internal elements of the electromagnetic valve is reduced, and the damping adjustment effect of the shock absorber is increased; the elastic element comprises n elastic rings; when the elastic element is in a compressed state, at least two elastic rings are located on the same radial plane, so that the space occupied after compression is small, the space between the armature and the mounting base for mounting the elastic element can be set to be small, and the setting volume of the electromagnetic valve is reduced.

The application belongs to the technical field of magnetic thrust bearing vibration reduction and isolation, and provides a reluctance composite permanent magnetic thrust bearing based on a Halbach array and a non-equal-length annular magnetic group magnetic force calculation method. The stator adopts an annular magnetic group and damping ring alternately arranged configuration, the magnetic force generated by the interaction between the stator and the rotor annular magnetic group is used for non-contact bearing, and the damping ring cuts the magnetic induction lines to generate a damping effect when the annular rotor magnetic group generates axial movement, thereby inhibiting the vibration under the impact load and improving the vibration reduction effect; meanwhile, the Halbach array is used to effectively improve the unit volume bearing capacity and damping effect. In addition, the magnetic dipole moment method and the Monte Carlo method are used for non-equal-length complex magnetic body axial force calculation, the four-fold integral calculation problem is avoided, the calculation is simple, accurate, practical and has high engineering application value.

The invention provides an off-grid cascade emergency energy storage system and a control method, three-phase star connection is adopted, each phase is formed by cascading AC sides of N H-bridge power units with DC filtering links, the DC side is connected with a battery cluster, and the AC side is directly connected with a load or a power grid through a filter. The system is provided with a unified controller, an off-grid V / F control mode is automatically switched to when double power supplies of a power grid lose power, and rated voltage and frequency are established; and after the power grid is recovered, executing pre-synchronization closed-loop adjustment according to an amplitude-frequency-phase sequence, and setting a gradually broadened frequency amplitude limiting interval to realize non-impact closing of the grid-connected contactor. A positive sequence d / q axis voltage outer ring, a current inner ring and a negative sequence current closed ring are arranged in the controller, sequential operation is carried out in the same interruption period, a cross decoupling and negative sequence suppression strategy is adopted, voltage is rapidly established at a 10ms level, and unbalanced load harmonic waves are eliminated. Seamless switching from off-grid to grid-connected is achieved, and the method is suitable for important load emergency power supply.

The application discloses a kind of high-rise fire extinguishing scene under unmanned aerial vehicle stable control method and system, it is related to unmanned aerial vehicle control technical field.A kind of high-rise fire extinguishing scene under unmanned aerial vehicle stable control system, including have: transient temperature module, coupling compensation module, shock wave prediction module, feedforward control module, attitude solution module, credible estimation module and attitude estimation module.The application is by obtaining heat-power impact joint prediction factor and when exceeding preset threshold, into impact feedforward control mode, realizes the active compensation of sudden impact disturbance, improves the response speed and stability of attitude control system;By dynamically adjusting attitude control loop parameters under impact feedforward control mode, improve the damping capacity under control impact disturbance, reduce attitude oscillation amplitude.

The utility model discloses a multi-layer rubber steel plate composite three-dimensional shock insulation support which comprises a hollow steel seat, a rubber bottom plate concentrically installed at the bottom end of the hollow steel seat in a sleeved mode and a steel cylinder installed at the top end of the rubber bottom plate in an inserted connection mode, and the top end of the steel cylinder penetrates out of the hollow steel seat and is sequentially provided with a steel plate body and an upper rubber plate in an overlapped mode. A top table is installed on the upper surface of the upper rubber plate, and a plurality of protruding columns extending into the steel cylinder are integrally formed at the bottom end of the top table. The at least two hydraulic dampers used for being connected with the convex columns at the lower end of the upper rubber plate are installed in the steel cylinder, the hydraulic dampers can absorb a large amount of vibration energy under the action of an earthquake, the strength of vibration transmitted to an upper structure is reduced, and the support can achieve multi-point energy dissipation. And the vibration control is more balanced and comprehensive.

The invention belongs to the technical field of switch equipment, and provides an annular magnetic switch and a magnetic damping generation method, and the annular magnetic switch comprises a mounting base which is provided with a first annular shaft; the key cap is movably connected to the mounting base, a second annular shaft is arranged at the position, corresponding to the first annular shaft, of the key cap, the second annular shaft is arranged in an inner hole of the first annular shaft in a penetrating mode, the second annular shaft and the first annular shaft are coaxially arranged, and a gap is formed between the first annular shaft and the second annular shaft; at least one of the first annular shaft and the second annular shaft is a magnetic shaft, and attraction magnetic force exists between the first annular shaft and the second annular shaft, so that the key cap has magnetic suspension force. When the key cap is pressed down, position deviation occurs between the second annular shaft on the key cap and the first annular shaft on the mounting base, so that a damping value of attraction between the first annular shaft and the second annular shaft is changed to generate hand feeling feedback of magnetic damping and a damping effect of the key, and the key can be applied to the fields of mice, keyboards, automobile instrument panels and the like.

The application provides a damper and relates to the field of dampers. The damper comprises a first base for mounting a weight, a second base in rotational connection with the first base, a fourth base, and a third base slidingly arranged on the fourth base; the third base is provided with a second damping device for impeding transverse movement and vertical movement of the second base; and the fourth base is provided with a third damping device for impeding longitudinal movement of the third base. The fourth mounting base of the damper can be fixed to a bridge or a building such as a house. When an earthquake occurs, transverse waves and longitudinal waves of the earthquake are transmitted to the fourth mounting base. Part of the vibration energy is absorbed by the second damping device and the third damping device, and part of the vibration energy is converted into the energy for rotating the first base around the second base, so that the building is prevented from shaking greatly. The damper has good damping effects in the transverse direction, the longitudinal direction and the vertical direction, and is convenient and practical.