94results about How to "Stiffness adjustment" patented technology

The invention discloses a fast tool servo device with adjustable rigidity. According to the device, a tool rest component is additionally arranged on an assembly of a frame, a flexible hinge, piezoelectric ceramic, a tool holder, a diamond cutting tool and the like, and comprises a spring bracket, a spring sleeve, a spring, a locking ring and the like; the spring bracket is arranged at the front end of the frame; the middle part of the spring bracket is provided with a threaded hole; the spring sleeve is matched with the threaded hole through external thread on the wall of the sleeve; the spring is arranged in the spring sleeve; one end of the spring is in contact with the bottom of an inner hole of the spring sleeve, and the other end of the spring is in contact with the flexible hinge on the frame; and pressure which is applied to the flexible hinge by the spring can be adjusted by turning the spring sleeve, so that the rigidity of the fast tool servo device is adjusted.

The invention discloses a rigidity-variable soft body mechanical hand, which consists of one or a plurality of execution units, wherein each execution unit comprises a deformation part and a rigidityregulating part; the deformation part mainly consists of a soft base body and peripheral restraint fiber; the rigidity regulating part is mainly a medium layer with a built-in rigidity regulating medium; a base body is of a flexible hollow tubular structure made of silica gel synthetic materials; two groups of inextensible fiber (wire materials) wound according to a certain angle are arranged at the outer side of the base body. The rigidity regulating part is arranged at the outer side of the base body; the rigidity regulating medium is built in the rigidity regulating part; the rigidity regulating part is subjected to vacuum pumping; the medium contact area is increased, so that the friction change is caused, and the rigidity is further changed. The soft body base body is driven by air pressure or hydraulic pressure; the rigidity regulating part is driven by using a negative pressure device; through the matching of the deformation part and the rigidity regulating part, the goal that the soft body mechanical hand realizes both the rigidity feature and softness feature is achieved; the operation efficiency is high; meanwhile, high safety during the interaction of external operationobjects and operation environment can be ensured.

The invention discloses a testing device for a damage concrete stress-strain whole curve caused by environment corrosion. The device comprises a rigid element, an upper pressing plate, a lower pressing plate, a height adjusting device, a pressure sensor, a cushion plate, a clamp and a laser displacement sensor. In the test process, a pressure tester exerts loads on the upper pressing plate, the rigid element and a concrete test piece bear force together to improve the rigidity of the tester, and therefore he deformation of a falling section of the test piece can stably develop, no fragile damage can happen, a dynamic strain instrument records pressure and test loads and deformation information output by the laser displacement sensor, and the damage concrete stress-strain whole curve caused by environment corrosion can be obtained through post-processing of a computer. The damage concrete stress-strain whole curve caused by corrosion can be accurately measured, and technical support is provided for studying the performance degradation law of concrete under the corrosion environment.

A reinforcement layer with the variable damping comprises a core tube arranged in the middle of a building and a plurality of frame columns arranged on the periphery of the building. An outrigger truss with the variable damping is connected between the core tube and the frame columns, the plurality of peripheral frame columns are connected through annular trusses with variable damping, the annular trusses are integrally connected, the lateral stiffness resistance of the overall structure can be increased and the horizontal lateral sway of the structure can be reduced by the aid of the outrigger truss with the variable damping, the connection of the peripheral frame columns can be strengthened by the aid of the annular trusses with variable damping, the structural integrity is enhanced, the vertical deformation of frames is coordinated, and the vertical deformation difference is reduced, so that the structure is even in force bearing, a diagonal web member with variable damping is composed of an anti-buckling support and a viscous damper, the viscous damper enables the structure to deform and the creep to relax under the temperature load, the internal force of the structure is reduced, the main energy-consumption member of the structure is the viscous damper under the action of the wind load, and the main energy-consumption member of the structure is the anti-buckling support under actions of the fortification intensity and earthquakes above the fortification intensity.

The invention belongs to the related technical field of elastic structures, and discloses a rigidity-adjustable spring mechanism. The rigidity-adjustable spring mechanism comprises a screw rod, an inner barrel, an outer barrel, a spring and a base, wherein external threads are formed on the screw rod; a threaded hole is formed in the inner barrel and screwed with external threads of the screw rod, so that the screw rod and the inner barrel are in threaded connection; the screw rod rotates to adjust the distance between the screw rod and the base; a spiral groove is formed in the outer wall of the end, facing the base, of the inner barrel; the spiral groove and the spring form a spiral pair; the inner barrel rotates relative to the spring to change the working length of the spring so as to further adjust the rigidity of the spring; the other end of the spring is connected to the base; and the outer barrel is arranged outside the spring and the inner barrel in a sleeving manner, and used for clamping the spring and the inner barrel to prevent the spring from slipping off or used for loosening the spring to facilitate rigidity adjustment of the spring.

The invention discloses a dual air spring with a shared additional air chamber and a control method and application of the dual air spring. The dual air spring is characterized in that the dual air spring comprises a left air spring body and a right air spring body, and the shared additional air chamber and a controller used for controlling the working mode of the shared additional air chamber are arranged between the left air spring body and the right air spring body. The occupied space of the dual air spring is effectively reduced through the shared additional air chamber, the rigidity of the dual air spring can be controlled in real time according to the load displacement working condition of the air spring and the running work condition of an automobile, and the damping effect of the air spring is improved.

The invention relates a vehicle suspension which comprises an oil cylinder, energy accumulators and damping adjustment units, wherein a rodless cavity of the oil cylinder and a rod cavity of the oil cylinder are respectively connected with one energy accumulator; one damping adjustment unit is arranged between the rodless cavity of the oil cylinder and the corresponding energy accumulator, and the other one damping adjustment unit is arranged between the rod cavity of the oil cylinder and the corresponding energy accumulator. The vehicle suspension has the beneficial effects that the two energy accumulator and corresponding valve banks are arranged, so that rigid and continuous adjustment is realized, the side-tipping resistance and side-turnover resistance of a vehicle are improved, and the comfort, safety and control stability of the vehicle are greatly improved; the capacity of a general gas chamber of the energy accumulator communicated with the rodless cavity of the oil cylinder is increased, so that the rigidity of the suspension is reduced, the suspension is relatively soft, and the vehicle is relatively stable and comfortable in running.

The invention discloses a linearly driven flexible gripper with variable rigidity based on a layer interference technology and a variable rigidity control method thereof. The gripper comprises a pedestal, wherein a plurality of flexible fingers and a motor are mounted at the edge of the pedestal, each flexible finger is externally coated with a vacuum bag, a vacuum pump is mounted in the middle ofthe pedestal, and the vacuum pump is connected to the vacuum bags; each flexible finger comprises a flexible finger framework, the middle of the flexible finger framework is of a sheet structure, a series of T-shaped block structures are arranged on two sides, a round hole is formed in the middle of each T-shaped block structure, a tendon rope penetrates the round hole, the upper end of the tendon rope is connected to the motor, and the lower end of the tendon rope is connected to the top end of the flexible finger framework; and the outer ends of the T-shaped block structures are connected to flexible sheets. The motor rotates to drive the tendon ropes, so that the fingers bend. Rigidity variation of the gripper is controlled by externally connecting a negative pressure pump, so that itis safe to drive bending and variable rigidity. The linearly driven flexible gripper is easy and controllable to operate and relatively large in grabbing space, can achieve a variable rigidity effect,and is suitable for relatively more occasions.

The invention provides a vibration isolator with replaceable springs. A top bearing device is connected with a first connecting rod and a second connecting rod through connecting pins, wherein the first connecting rod and the second connecting rod are located below the top bearing device. The first connecting rod and the second connecting rod are connected with a third connecting rod and a fourth connecting rod through connecting pins respectively. The third connecting rod and the fourth connecting rod are connected in a crossed mode. A Y-shaped connecting-rod mechanism is formed by the four connecting rods. The other end of the third connecting rod and the other end of the fourth connecting rod are connected with sliding blocks and rolling bearings through lantern ring devices respectively. The rolling bearings and the sliding blocks are placed on a base. Two layers of threaded holes are designed in the periphery of the base. The base and a blocking cover are connected through the eight threaded holes in the circle close to the inner side. The base and a shell are connected through the twelve threaded holes in the circle close to the outer side. An internal structure is completely surrounded by the shell, so that a relatively closed complete vibration isolator system is formed. According to the vibration isolator with the replaceable springs, through the cooperation of the shell and the internal structure, spring replacement can be achieved conveniently, the service life of the vibration isolator is guaranteed, and maintenance of the vibration isolator is facilitated.

The invention relates to a single power source-based variable stiffness flexible joint. A joint driving end comprises a joint support, a reducer support, an interlocking clutch structure, a harmonic reducer and a joint driving motor with an encoder, wherein the joint support is a U-shaped structure component, and the harmonic reducer is connected with the left end of the joint support through thereducer support; the output end of the joint driving motor is connected with a stiffness adjustment mechanism through the interlocking clutch structure, and the reducer support is of a hollow cylindrical shell; one end of the reducer support is provided with a mounting hole for connecting the harmonic reducer, and the other end of the reducer support is provided with a threaded hole for connectingthe left end of the joint support; a shaft shoulder is also arranged on the reducer support, and the interlocking clutch structure is positioned in a cavity of the reducer support. The joint uses thesingle motor to achieve joint drive and stiffness adjustment, and has the advantages of compact structure, high integration, high positioning accuracy, substantially continuous linear accurate adjustment of stiffness, and various stiffness adjustment modes.

The invention discloses a damping-variable rigidity-adjustable absorber. A spring compression end cover is positioned at an opening of a spring fixing cylinder, and a size of the spring compression end cover is matched with a size of the opening of the spring fixing cylinder. A diaphragm spring is installed below the spring compression end cover, and an outer cylinder of a damper is installed in the spring fixing cylinder. An upper end cover of the damper is positioned at an opening of the outer cylinder of the damper, and a size of the upper end cover of the damper is matched with a size of the opening of the outer cylinder of the damper. The upper end cover of the damper is installed below the diaphragm spring. Centers of the spring compression end cover, the diaphragm spring and the outer cylinder of the damper are provided with through holes in the same size. A piston rod passes through the through holes of three parties. A piston is fixed at the bottom of the outer cylinder of thedamper. The piston rod passes through the piston. The interior of the piston is provided with multiple upwards and downwards through inner channels. The inner channels are installed along a radial direction of the piston. A pole positioning plate is positioned in the inner channels. The interior of the spring fixing cylinder is filled with giant electrorheological fluid. The damping-variable rigidity-adjustable absorber can be used for real-time adjustment of damping and rigidity.

The invention relates to a seal assembly used for a hydraulic bushing and the hydraulic bushing. The seal assembly comprises a rigid support ring assembly and a second rubber body. The support ring assembly is provided with an assembly ring and a convex ring protruding outwards in the radial direction from the outer wall of the assembly ring. The assembly ring is sleeved with the second rubber body in a manner that the convex ring is coated with the second rubber body. The seal assembly can improve the axial stiffness of the hydraulic bushing so that the purpose of adjusting the axial stiffness of the hydraulic bushing by changing the radial stiffness of the seal assembly can be realized.

A circular section spring mechanism with the adjustable rigidity comprises a pipe body, a circular section spring, a pipe sleeve, a tightening screw and a regulating screw. the outer wall of the pipe body is provided with an outer thread, the inner wall of the pipe body is provided with an inner thread, the regulating screw is screwed in the inner thread to form a first screw pair, and the circular section spring is screwed in the outer thread to form a second screw pair; the pipe sleeve is installed outside the pipe body and provided with a threaded hole, and the tightening screw is installed in the threaded hole; the circular section spring is a cylindrical equal-pitch spiral spring; the thread pitch of the inner thread is equal to that of the outer thread; the lead angle of the inner thread and the outer thread of the pipe body is smaller than the smallest equivalent friction angle in the first screw pair and the second screw pair; the rigidity of the circular section spring can be adjusted within a designed range. According to the circular section spring mechanism with the adjustable rigidity, the structure is simple, larger load can be borne, the stability is high, the rigidity of the spring mechanism can be adjusted under the loading condition, the rigidity adjustment process is simple, the adjusting time is greatly saved, and the adjusting efficiency of a sample mechanism is improved.

The invention discloses a rigidity adjusting hand wheel of a suspension seat for an automobile, comprising an eccentric wheel handle, an outer tooth dial, an inner tooth ring and a rear cover. The end part of the eccentric wheel handle is a transparent body. A rotating rod extends from the centre of the rear end of the eccentric wheel handle. The rear end of the eccentric wheel handle is provided with a containing space. The outer tooth dial, the inner tooth ring and the rear cover orderly penetrate on the rotating rod of the eccentric wheel handle, and are contained in the containing space of the eccentric wheel handle. The inner tooth ring is sleeved at the external part of the outer tooth dial; the inner teeth of the inner tooth ring can be meshed with the outer teeth of the outer tooth dial. The rear cover is clamped on the eccentric wheel handle to combine the eccentric wheel handle, the outer tooth dial and the inner tooth ring together. A locating baffle block is arranged at the rear end of the inner tooth ring and the locating baffle block extends from the centre of the rear cover to be clamped on the suspension seat of the automobile. The invention has high rigidity adjusting precision, and can meet the precise adjustment to rigidity of the mechanical suspension seat so that the driver easily finds out the seat rigidity of the weight.

The invention discloses a steel wire driving type variable-rigidity damping vibration attenuation boring bar, belongs to the technical field of metal cutting machining, and aims to solve the problem of vibration of the tip of a boring blade when a deep hole is bored. The steel wire driving type variable-rigidity damping vibration attenuation boring bar comprises a boring rod, a vibration reduction structure and a rigidity adjusting unit; the boring rod is provided with a cavity with an opening in the front end, a vibration reduction structure is arranged in the cavity with the opening in the front end, the vibration reduction structure is used for relieving boring rod micromotion caused by cutting, and a uniform radial gap exists between the vibration reduction structure and the inner wall of the boring rod; a tool bit connecting piece is arranged at the opening of the front end of the cavity with the opening in the front end; and the rigidity adjusting unit adjusts the rigidity of the vibration reduction structure by adjusting the distance between the sliding block and the front end of the boring rod. The vibration reduction structure is installed in the cavity in the front end of the boring rod, the vibration reduction performance is adjusted by adjusting the rigidity and damping of the vibration reduction structure, and the vibration reduction performance of the boring rod is optimal.

The invention discloses a rigidity-adjustable water lubricating stem bearing. The stem bearing comprises a bearing sleeve, bearing supports and rigidity-adjustable bearing bushes. Each rigidity-adjustable bearing bush is of a flexible structure with an airtight cavity. The rigidity-adjustable bearing bushes are fixedly connected in the bearing sleeve through the bearing supports. The rigidity-adjustable bearing bushes are distributed in the circumferential direction of the bearing sleeve. The surfaces of the rigidity-adjustable bearing bushes are higher than the inner diameter surface of the bearing sleeve. A flow partition water groove is formed between every two adjacent rigidity-adjustable bearing bushes. The rigidity-adjustable bearing bushes can be used for adjusting the rigidity of the bearing in the manner that high-pressure gas is changed in and discharged from the airtight cavities of the rigidity-adjustable bearing bushes. By means of the rigidity-adjustable water lubricating stem bearing, the problems that the maintenance period is long and the maintenance workloads are large when an existing water lubricating stem bearing is replaced or maintained, and the rigidity of the water lubricating bearing cannot be adjusted to adapt to vibration of a stem shaft system can be solved.

The invention belongs to the field of a servo mechanism, relates to an adjustable-rigidity double-air-rudder equivalent load simulation device, and specifically relates to an adjustable-rigidity double-air-rudder equivalent load simulation device for acceptance inspection of electro-hydraulic servo mechanism. The device comprises a right-end inertia assembly, a left-end inertia assembly, a base and an elastic support ear assembly; and the right-end inertia assembly and the left-end inertia assembly are symmetrically fixed on the base, and the elastic support ear assembly is fixed to a side face of the base. The device has the advantages of two-position integration and the small space structure, a load characteristic is guaranteed to be stable and reliable in a long term, and assembly and disassembly of a to-be-detected product, filling of a servo mechanism, vacuum pumping and other operation are convenient to perform; the rotational inertia, the inertia moment and the load rigidity parameter are adjustable; and, when the device does not work, a swinging scope of a rocker arm can be limited through a limited rod, and then the object of protection of n angle displacement sensor is achieved.

The invention discloses an electric wheel driving system integrating steering, roll preventing and driving. The electric wheel driving system comprises a double-rotor motor, an anti-roll gear, an L-shaped anti-roll rod and a linear motor and is characterized in that the output end of the outer rotor of the double-rotor motor is connected with a wheel, and the output end of the inner rotor of the double-rotor motor is connected with a drive gear; the anti-roll gear is located on one side of the drive gear and meshes with the drive gear; one end of the L-shaped anti-roll rod is fixedly connectedwith the anti-roll gear through a first clutch, and the other end of the L-shaped anti-roll rod is connected with a suspension; the linear motor is fixed on one side of the double-rotor motor, and the secondary end of the linear motor is connected with a steering tie rod and used for driving the steering tie rod to achieve steering; when the first clutch is in a combining state, the output end ofthe inner rotor generates resisting moment for stopping the suspension from bouncing vertically so as to prevent roll. The electric wheel driving system has the advantages that system integration isincreased, space saving is achieved, and overall-vehicle arrangement is facilitated.

The invention discloses a magnetorheological elastomer gasket and a control device thereof. The magnetorheological elastomer gasket is composed of a rubber substrate and micro-sized ferromagnetic particles and has the variable rigidity characteristic. The control device of the gasket mainly comprises electromagnets, an adjustable power supply, a pressure sensor and a controller which jointly compose a feedback control loop, and the rigidity of the magnetorheological elastomer gasket can be adjusted in real time. The magnetorheological elastomer gasket and the control device thereof are simplein structure and low in cost, stress and deformation self compensation of the gasket can be achieved, the stability of fasteners and the airtightness of a pipeline or valve connector can be improved,the service life of the gasket is prolonged, and the magnetorheological elastomer gasket and the control device thereof are particularly suitable for environments with high requirements for safety andprecision.

The invention discloses a variable-stiffness single-degree-of-freedom dynamic damping boring rod. The variable-stiffness single-degree-of-freedom dynamic damping boring rod comprises a boring rod front half part and a boring rod rear half part, wherein the boring rod front half part is connected with the boring rod rear half part; a cavity is formed in the boring rod front half part; a mass blockis arranged in the cavity; a rubber hose is spirally wound on the mass block; an axial hole is formed in the rear end surface of the mass block; a radial hole is formed in the side wall of the rear end of the mass block; the axial hole communicates with the radial hole; one end of the rubber hose is fixedly arranged at the front end of the mass block, and is wound to the rear end of the mass blockin the length direction of the mass block; after passing through the radial hole and the axial hole, the rubber hose extends out of the mass block; and an end cap is arranged between the boring rod front half part and the boring rod rear half part. The rubber hose is charged with liquid, so that a pressure intensity regulating structure is realized; and an outside control system is not required,so that liquid of different pressure intensities only needs to be led into the rubber hose only through a hydraulic pump, and therefore, implementation is simple, and cost is relatively low.

A flexible drive knee joint rehabilitation robot comprises a frame, a seat, a left training mechanism and a right training mechanism, the seat is arranged at the bottom of the frame, the left training mechanism and the right training mechanism are located on the left side and the right side of the seat respectively, the left training mechanism comprises a left thigh section, a left shank section and a novel parallel spring type pneumatic artificial muscle driver, the upper end of the left thigh section is fixedly connected with the seat, the lower end of the left thigh section is rotationally connected with the upper end of the left shank section, and two ends of the novel parallel spring type pneumatic artificial muscle driver are rotationally connected with the left thigh section and the left shank section respectively; and the right training mechanism comprises a right thigh section, a right shank section, a flexible cable, a servo driving module and a variable stiffness module, the upper end of the right thigh section is fixedly connected with the seat, the lower end of the right thigh section is rotationally connected with the upper end of the right shank section, one end of the flexible cable is connected with the right shank section, the other end of the flexible cable is connected with the servo driving module, and the variable stiffness module is arranged on the flexible cable.

The invention discloses a variable-rigidity variable-damping magnetorheological fluid vibration reduction boring bar, and relates to the technical field of cutting machining. The problem that vibration generated in the machining process of an existing boring rod affects the machining precision and the machining efficiency is solved. The boring rod comprises a tool bit connecting block, a coil, a cylinder body, a rod body, a cylinder cover, a cantilever beam, an iron core, a telescopic rod, a sliding block, a lead screw, a stepping motor and a control system, the cylinder body is inserted in a cavity of the boring rod, the iron core is arranged in the cylinder body, a gap is formed between the iron core and the inner side wall of the cylinder body, the iron core is fixedly connected to the end of the rear end of the cantilever beam in a sleeving mode, and the coil is embedded in the outer side of the iron core; the cylinder body is filled with magnetorheological fluid, the telescopic rod is inserted into the rod body, the front end of the telescopic rod is arranged in the boring rod cavity and perpendicularly and fixedly connected with the rear end of the cylinder body, the front end of the lead screw is in threaded connection with the rear end of the sliding block, the rear end of the lead screw is fixedly connected with an output shaft of the stepping motor, and the rear end of the telescopic rod is arranged in the groove and fixedly connected with the front end of the sliding block. The boring cutter is used for boring.

The invention discloses a stiffness adjustment device of a double-coupling air spring. The stiffness adjustment device of the double-coupling air spring comprises a bellows-type frame, a first air spring and a second air spring which are arranged in the bellows-type frame in series, a middle cross beam arranged between the two air springs, air inflation and deflation mechanisms and a power input mechanism; and air inflation and deflation are conducted on the first air spring and the second air spring through the air inflation and deflation mechanisms to change the stiffness of the double-coupling air spring. Monitoring of air pressure inside the air spring is conducted through air pressure sensors, the air inflation and deflation mechanisms are controlled to conduct the air inflation and deflation on the air springs to adjust the pressure of air inside the first air spring and the second air spring, and therefore the stiffness adjustment of the two air springs is achieved; and according to the stiffness adjustment device, the structure is compact, use is convenient, when the external environment and a power vibration exciting source change, the stiffness adjustment of the springs of a double-coupling mechanism can be achieved without replacing the springs, the use range of the double-coupling spring mechanism is enlarged, and the adaptability is improved.

A square-section spring mechanism with adjustable rigidity comprises a pipe body, a spring and a screw, an external thread is arranged on the outer wall of the pipe body, an internal thread is arranged on the inner wall of the pipe body, the screw is screwed into the internal thread to form a first screw pair, and the spring is screwed into the external thread to form a second screw pair. The spring is a cylindrical equal-pitch spiral spring with the rectangular section, the first screw pair and the second screw pair are rectangular screw pairs, the internal thread and the external thread are equal in pitch, the lift angle of the internal thread and the lift angle of the external thread of the pipe body are smaller than the minimum equivalent frictional angle in the first screw pair and the second screw pair, and the rigidity of the spring is continuously adjustable within the design range. The square-section spring mechanism is simple in structure, capable of bearing large loads and high in stability, the rigidity of the spring mechanism can be adjusted under the loading condition, the rigidity adjusting process is simple, the debugging time is greatly saved, and the debugging efficiency of a prototype is improved.

The invention discloses an active control SMA metal rubber shock absorber and a vibration isolation performance adjusting method, and belongs to the field of vibration and impact protection. The problems that an existing vibration isolator is simple in structure, has natural frequency and fixed rigidity and cannot be adjusted to be applicable to various working conditions are solved. The shock absorber comprises an SMA metal rubber blank and insulated electric heating wires which are uniformly distributed in the SMA metal rubber blank, and the SMA metal rubber blank and the insulated electricheating wires are stamped into an integral piece. The temperature of the SMA metal rubber shock absorber is adjusted by changing the current introduced into the insulated electric heating wires, and the rigidity, the natural frequency, the transmission rate and the energy dissipation coefficient of the SMA metal rubber shock absorber are adjusted according to the change of the temperature of the SMA metal rubber shock absorber. The shock absorber is mainly used for vibration reduction.

The invention discloses a tension stable type unrolling device for a bag making machine. The tension stable type unrolling device comprises a machine frame and a raw paper tube. A paper guide roller is fixed to the lower portion of the machine frame. The lower end of a paper rolling shaft of the raw paper tube is provided with a pair of rolling bearings. The outer side of the upper portion of the raw paper tube is provided with a damping belt. One end of the damping belt is fixedly connected with the lower portion of the machine frame through a damping shock absorber, and a balance weight hammer is hung to the other end of the damping belt. The damping shock absorber is composed of a columnar front bracket, a cylindrical rear bracket, a front pull ring, a rear pull ring, a piston rod, an adjusting column, a thread connection portion, an adjusting sleeve and a spring. The inner sides of the front bracket and the rear bracket are connected through the piston rod and the adjusting column. The adjusting column is rotationally connected with the adjusting sleeve through the thread connection portion. The spring is limited between the front bracket and the adjusting sleeve. The damping shock absorber is additionally arranged at the fixed end of the damping belt, the peak value of tension of raw paper can be reduced in the starting process, the raw paper can be prevented from being pulled apart, a paper roll can be rapidly braked in the stop process, and the damping shock absorber shrinks to enable the paper roll to rotate reversely, and looseness of the raw paper is reduced.

The invention discloses a pendulum type external elevator shaft system with a multi-stage frequency modulation function. When a structure vibrates, multiple natural vibration periods of a tuning pendulum type external elevator shaft are equal to or approximate to the multi-stage period of the structure, so that tuning vibration reduction control over multiple vibration modes of the structure is achieved. The rigidity of friction vibration isolation supports is changed through the thickness of a sliding block and a friction material according to the actual demand, so that the integral rigidityof a device is conveniently adjusted according to the actual condition of the structure. In order to ensure the safety of personnel during an earthquake, the power supply of an elevator is cut off, and running of the elevator is prohibited; an elevator system stays in a non-working state during the earthquake and is converted into an equivalent swing wall system to carry out energy dissipation andvibration reduction on the main body of a building structure. When the structure vibrates and shaking of the main body structure exceeds a certain range, a rigid connecting rod can push a rotary support, a limiting plate does not limit sliding of sliding supports any more, and the tuning pendulum type external elevator shaft swings, so that a multi-stage tuning function is achieved.

The invention provides a rack experimental device with adjustable rigidity and a rigidity adjusting method thereof in order to solve the problem that the conventional rack experimental device has a bad fatigue test effect on the whole automobile or other parts of the automobile. According to arrangement of bolts and fastening nuts corresponding to bottom support through grooves and base through grooves and the setting of height of a supporting cylinder, the rigidity of the rack experimental device can be conveniently adjusted, particularly the rigidity can be adjusted in different directions, so that a fatigue test state accords with an actual operating state of the automobile body and the other parts of the automobile, the precision and effect of the fatigue test of the automobile body and the other parts of the automobile are greatly improved, and an accurate experimental validation guidance is provided for the design of the automobile and the parts.

The invention discloses a robot bionic flexible electronic skin with controllable global rigidity. The system comprises a three-level sensing system. The first-level sensing is approaching sensing, is composed of a capacitive approaching flexible sensor array, and can sense the approaching distance, approaching speed and approaching direction of a man-machine. Secondary sensing is sensitive contact sensing, and a sensitive flexible tactile sensor with a bionic hair structure is adopted, so that contact force can be detected; the three-level sensing is load-sensitive tactile sensing, a flexible tactile sensor and a flexible driver which are integrated are adopted, the rigidity of the flexible electronic skin can be globally adjusted, the contact pressure can be detected, the measuring range and the sensitivity can be changed, and then dynamic load self-adaption is achieved. According to the invention, multi-source and multi-mode signals can be detected through a multi-stage sensing system.

The invention relates to a vehicle suspension and a vehicle. The suspension comprises an oil cylinder, a power unit and at least three accumulators, wherein a rod chamber of the oil cylinder is communicated with the first accumulator and the power unit respectively, and a rodless chamber of the oil cylinder is communicated with the second accumulator and the power unit respectively. The vehicle comprises the suspension which is arranged at the bottom of a vehicle body. The suspension and the vehicle have the beneficial effects that real-time and step adjustment of rigidity is achieved and the side-tipping and rollover resistance of the vehicle is improved, thus greatly improving the comfort, safety and handling stability of the vehicle; and the volume of the total air chamber of the accumulator connected with the rodless chamber of the oil cylinder is increased, thus reducing the rigidity of the suspension, so that the suspension is more flexible and then the vehicle runs more stably and comfortably.