38results about How to "Wide range of stiffness" patented technology

The invention relates to a vibration isolation and buffer device for machine-born equipment, in particular to a totally-closed rigidity adjustable type vibration isolator, which comprises a casing, an installation core shaft, a protective rubber cover, an upper rubber ring, a spherical vibration isolation part and a lower rubber ring. The casing is of a sealed structure, the top of the casing is provided with an installation hole where the installation core shaft is arranged, and the spherical vibration isolation part is arranged in the sealed casing and is connected with the bottom of the installation core shaft together. The upper rubber ring is sleeved at the upper portion of a damp rubber ball, and the lower rubber ring is sleeved at the lower portion of the damp rubber ball which is sealed in the casing. The totally-closed rigidity adjustable type vibration isolator adopts a totally-closed structure to have small environment influence, utilizes a combination structure combining the spherical surface and the cylindrical surface to improve vibration isolation and retarding effects, utilizes the structures of the upper rubber ring and the lower rubber ring to limit the swinging of the head of the installation core shaft and improve using safety, and can be suitable for different frequency ranges by rotating the upper cover to adjust the rigidity of the vibration isolator.

The invention discloses a paralleling model semi-active vibration isolator. The vibration isolator is characterized in that a cylindrical upper shell is arranged, a rubber main spring is plugged in a top end opening of the upper shell, a main spring framework penetrates through the rubber main spring and is provided with an upper connection stud and a lower connection stud, the upper connection stud is connected with a main vibrating object, the lower connection stud is connected with a column-shaped iron core where an excitation coil is wound, the column-shaped iron core is supported in a magnetism conduction sleeve through a cutting magnetorheological elastomer arranged on the outer circumference of the column-shaped iron core, the two ends of the magnetorheological elastomer are extruded to be connected with the top of a T-shaped support and the bottom end of the iron core, and the T-shaped support penetrates through the magnetism conduction sleeve and is fixedly connected; the upper shell is connected with a lower shell, the lower end of the T-shaped support is fixedly connected with the lower shell, and the bottom of the lower shell is provided with a connection bolt used for being connected with a basal body. By means of the vibration isolator, vibrating energy transmitted by a rotary machine to the basal body can be effectively reduced, vibration of relative parts of the rotary machine is reduced, and the service life of the rotary machine and a system of the rotary machine is prolonged.

A permanent magnetic rigidity variable drive module for a flexible robot is suitable for establishing an antagonistic type flexible rigidity variable robot, especially a multi-freedom-degree flexible parallel rigidity variable robot. Compared with the prior art, the permanent magnetic rigidity variable drive module has the beneficial effect that under the situation that no motor torque is increased, the rigidity adjusting range is enlarged. When the multi-freedom-degree flexible robot is established, a drive unit and a rigidity variable module can be arranged on the rear part, the mass and the inertia of an operation arm are greatly reduced, and therefore the problem that in a traditional series manner, the rigidity change capacity is insufficient as the mass and the inertia are gradually increased is solved. According to the permanent magnetic rigidity variable drive module, one end of a rope is fixed to a rope winch, the rope sequentially penetrates through fixed pulleys, a movable pulley and a rope winch, the rope winch and the fixed pulleys are externally tangent to the same straight line, and the movable pulley is clamped to a symmetrical axis of the two fixed pulleys. The air gap interval between annular permanent magnets is reduced as the distance between a movable sliding base and a fixed base is reduced, and the rope tensile force and the rigidity are improved. The permanent magnetic rigidity variable drive module for the flexible robot is concise in movement type, easy and convenient to manufacture and easy to operate.

The invention discloses a variable stiffness sensing array based on a flexible porous material. The sensing array comprises a dynamic micro-force flexible sensing layer, a static force flexible sensing layer and a packaging layer. The dynamic micro-force flexible sensing layer comprises a flexible porous sensing thin layer prepared by mixing the flexible porous material and a sensitive conductivematerial, and a corresponding conductive electrode; the static force flexible sensing layer comprises flexible sensing units, silica gel air chambers and a flexible substrate wrapping the flexible sensing units and the silica gel air chambers and playing a role in connection; two output ends are led out to serve as electrical signal transmission channels after two ends of all the flexible sensingunits are connected in series, and breather pipes penetrate through the bottoms of all the silica gel air chambers. The packaging layer is composed of a textile thin layer sprayed with an insulating material. The sensing array disclosed by the invention has the functions of adjustable sensitivity and adjustable rigidity of the sensing array; the silica gel air chambers and the flexible porous material have the advantages of safety, buffering and energy absorption, and also have the characteristics of replaceability and personalized installation.

The invention discloses an air spring auxiliary chamber of a vehicle air suspension, which has a variable volume. N separators are arranged in a cylindrical cylinder body to uniformly divide a cylinder body inner cavity into n small chambers along the axial direction; a center shaft extends into the cylinder body from the outside of one end of the cylinder body and is inserted in center holes of the n separators; the first separator is tightly attached to the other end face of the cylinder body; the same position on each separator is provided with a sector through hole which is coaxial with the center holes; the middle of each separator is provided with a cylindrical hollow slot which is coaxial with the center holes; a sector valve plate is arranged in each cylindrical hollow slot; all the sector valve plates are axially in rigid connection with the center shaft in a spiral manner along the center shaft; one end of the center shaft positioned outside the cylinder body is connected with a stepping motor and an angle sensor is arranged on the end face of the one end of the center shaft; and when the center shaft rotates by a certain angle every time, different sector valve plates are driven to seal the corresponding sector through holes, so that automatic and rapid change of the volume of the auxiliary chamber is implemented and an air spring obtains a large rigid variation range.

The invention discloses a composite load simulator for achieving multidimensional pure bending moment and tensile pressure. The composite load simulator can achieve pure bending moment loading, tensile pressure loading and pure bending moment and tensile pressure composite loading in any direction. The simulator comprises a moving platform, a fixed base and moving branch chains. The moving platform is fixedly connected with a loaded test piece, and the moving branch chains comprise the central moving branch chain and the uniformly-distributed moving branch chains, wherein the uniformly-distributed moving branch chains are of six different structures. The uniformly-distributed moving branch chains of the different structures, the central moving branch chain, the fixed base and the moving platform can form six kinds of different bending moment-tensile pressure composite load simulator structures. The composite load simulator has the advantages that the composite load simulator can achieve multidimensional pure bending moment load output and can output composite loads of the bending moment and the tensile pressure; due to the fact that the branch chains exist, the structure has high bearing rigidity, decoupling can be achieved through output of the tensile pressure and the bending moment, and the composite load simulator is convenient to control, simple to manufacture and convenient to install.

The invention provides a variable-rigidity driving structure. The structure comprises a rotating structure, wherein the two ends of the rotating structure are both fixedly provided with super-elasticshape memory alloy wires, the rotating structure is sleeved with a corrugated pipe, a low-melting-point alloy is injected in the corrugated pipe, the two ends of the corrugated pipe are sealed throughspring supports, the spring supports are fixedly connected to the super-elastic shape memory alloy wires, a shape memory alloy spring is further fixed between the two spring supports, the low-melting-point alloy is heated and cooled, so that the rotating structure can be switched between a rotating state and a locked state, and the rigidity change range of the variable-rigidity driving structureis greatly expanded. The invention further provides a finger joint comprising the variable-rigidity driving structure and a variable-rigidity flexible mechanical arm.

The invention discloses a double-layer pneumatic spiral soft body actuator with variable stiffness. The soft body actuator comprises a pneumatic soft body actuator body, an air guide pipe and a variable stiffness module. The air guide pipe is fixedly installed at the end of the pneumatic soft body actuator body, and the variable stiffness module is fixedly installed at the bottom of the pneumatic soft body actuator body. The soft body actuator is connected with an outer auxiliary device through the air guide pipe, the outer auxiliary device is used for providing and controlling the air pressure needed by spiral deformation of the soft body actuator, the soft body actuator is electrically connected with a temperature control device through the variable stiffness module, and the temperature control device is used for controlling the temperature influencing the stiffness of the soft body actuator. The variable stiffness module is more tightly attached to an object, various objects with complex surface shapes are grabbed through more flexible deformation of the spiral soft body actuator, and spiral grabbing, thin-stick-shaped object grabbing and the like are achieved.

The invention discloses a novel universal variable rigidity manipulator joint. The output of a harmonic reducer is fixedly connected with a threaded end of a trapezoidal lead screw; when the trapezoidal lead screw rotates, a lead screw nut and the trapezoidal lead screw can produce relative axial movement; the lead screw nut is fixedly connected with a lead screw nut fixing disc; the lead screw nut fixing disc and a roller bearing disc can perform axial movement relative to a joint shell along a guide rail fixed to the inner side of the joint shell; a mould spring is mounted between the lead screw nut fixing disc and the roller bearing disc in a sleeving manner; an arc-shaped wheel disc is mounted between the roller bearing disc and a horizontal end of the trapezoidal lead screw; the arc-shaped wheel disc is mounted on the trapezoidal lead screw in the sleeving manner; the horizontal end of the trapezoidal lead screw positions the trapezoidal lead screw in the radial direction througha bearing, bears the acting force of the mould spring and transfers the acting force of the mould spring to the arc-shaped wheel disc; the arc-shaped wheel disc is fixedly connected to an output flange, and is supported to rotate relative to the joint shell through the bearing; and the arc-shaped wheel disc is matched with a roller bearing mounted on the roller bearing disc, so that the external acting force acting on an output flange is converted into compression force acting on the spring.

The invention discloses a stacked paper folding structure with variable stiffness characteristics, which comprises a plurality of layers of paper folding tubes stacked up and down, each paper foldingtube comprises two symmetrically arranged paper folding plates, each paper folding plate comprises a plurality of basic units, the basic units are connected in sequence, each basic unit comprises n small planes and two large planes, n is an even number greater than 2, the width ratio of the large plane to the small plane is n/2, and the large plane and the small plane are parallelograms. Due to the fact that all layers of paper folding pipes of the stacked paper folding structure are different in rigidity, when the stacked paper folding structure is subjected to compression force from top to bottom, the stacked paper folding structure generates a layer-by-layer progressive buckling instability process, firstly, the paper folding pipe with the minimum rigidity is subjected to buckling instability, and then the paper folding pipe with the second small rigidity is triggered to be subjected to buckling instability; therefore, the paper folding pipe with the maximum rigidity is obtained through recursion, and then the variable rigidity characteristic of the stacked paper folding structure is achieved. According to specific requirements, multiple layers of paper folding pipes with different rigidities can be stacked, and multiple variable stiffness characteristics are achieved.

The invention provides a bearing pre-tightening device. The bearing pre-tightening device comprises a bearing seat, two bearings and a shaft sleeve; the bearings are installed inside the bearing seatand are installed on a shaft through the shaft sleeve; the bearings are axially positioned; the bearing seat is provided with a pressing device; the pressing device is used for pressing an outer ringof each bearing; an elastic element is arranged between the two bearings; the elastic element is deformed after being stressed so as to press the outer ring of each bearing, and thus each bearing isapplied with pre-tightening force. The bearing pre-tightening device provided by the invention comprises an integrated elastic element which is simple in structure and convenient to install; moreoverthe elastic element has the characteristic of wide rigidity range; and the bearing pre-tightening device can be used for applying various different pre-tightening force by designing various differentrigidity.

The invention relates to a rigidity-controllable material oriented to a material increase manufacturing technology and a manufacturing method thereof. The rigidity-controllable material comprises, by mass, 10-40 parts of acrylic oligomer, 60-90 parts of alkyl acrylate and 0.1-3 parts of ultraviolet light photoinitiator, and the acrylic oligomer, wherein the alkyl acrylate and the ultraviolet light photoinitiator are sequentially mixed and evenly stirred to prepare a photocuring raw material; a three-dimensional model for a rigidity-controllable material device is built, discretization is carried out on the surface of the three-dimensional model to generate a three-dimensional digital model file, and a machining file capable of being identified by a material increase manufacturing device is led out after supporting adding, model layered discretization and machining path generation are carried out on the three-dimensional digital model file; the photocuring raw material is manufactured into the rigidity-controllable material device through the ultraviolet light polymerization material increase manufacturing technology. The obtained device is variable in structure, the rigidity controlling performance is excellent, and the rigidity-controllable material has the advantages of being high in efficiency, low in cost and high in accuracy; the glassy state Yang modulus value is approximately 500 times of the rubbery state Yang modulus value, and the response speed of the Yang modulus along with changes of the temperature is high.