314 results about "High stiffness" patented technology

A racket comprises a handle and a body connected to the handle. The body includes a core layer, a first surface layer, a first inner layer disposed so as to sandwich the first surface layer with the core layer, and a first outer layer disposed so as to sandwich the first inner layer with the first surface layer. The first inner layer is an elastic body. The first outer layer has a higher stiffness than the first inner layer. The core layer has a higher stiffness than the first inner layer.

The invention discloses a ternary topological mixed truss girder based on steel-mixed-cable cooperative stress, and belongs to the technical field of constructional engineering, the ternary topological mixed truss girder comprises at least one single body structure, each single body structure is composed of an upper concrete body, a middle truss assembly and a lower prestress assembly from top to bottom, and each middle truss assembly comprises a web member and an inclined strut; the multiple web members are distributed in a linear mode at intervals, and the inclined struts are arranged between every two adjacent web members. The lower prestress assembly comprises anchoring seats and anchor cables, the multiple web members are each provided with one anchoring seat, and all the anchoring seats are connected through the anchor cables. According to the ternary topology hybrid truss girder, high rigidity of a pressed area and high strength and light weight of a pulled area are achieved, meanwhile, differentiation reinforcement of a midspan area is achieved, and stress coordination of multiple components is guaranteed. The invention further discloses a construction method of the ternary topology mixed truss girder based on steel-mixed-cable collaborative stress.

The batten type water lubricated bearing comprises a shaft sleeve and a plurality of composite battens which are installed on the inner wall of the shaft sleeve at intervals in the circumferential direction of the shaft sleeve, and the composite battens comprise the first battens installed in a bearing area of the bearing and the second battens installed in a non-bearing area of the bearing. A through type variable cross-section groove is formed in the side, away from the ship stern shaft, of the first batten in the length direction of the first batten, and the cross-section area of the variable cross-section groove is gradually increased from the bow to the stern. The invention further discloses an assembly method of the batten type water lubricated bearing. The first batten is arranged in the bearing carrying area and provided with the variable cross-section groove, so that the rigidity of the first batten is gradually reduced in the direction from the bow to the stern, axial gradient rigidity distribution is formed, the low-rigidity area at the stern end can adapt to deformation of the stern shaft to be adjusted in a self-adaptive mode, local stress concentration is reduced, and the stability of the stern end is improved. And a high-rigidity area at the bow end maintains necessary bearing strength, so that the axial load of the bearing is homogenized as a whole.

The invention relates to the field of woven materials, in particular to a fiber hybrid woven composite material based on bionic multistage gradient design. The material is obtained through material gradient design, structure gradient design and interface gradient design. The material comprises a surface layer high-rigidity area, a transition area and a core high-toughness area, wherein the surface layer high-rigidity area adopts carbon fibers I as warp and weft yarns; in the transition area, basalt fibers I are adopted as weft yarns, carbon fibers II are adopted as warp yarns, and Z-direction yarns are aramid fibers I; warp yarns of the core high-toughness area are basalt fibers II, and weft yarns and Z-direction yarns of the core high-toughness area are aramid fibers II. The defects of stress concentration, insufficient interlayer toughness, interface slippage and the like existing in traditional plain / twill weaving are effectively overcome. According to the design, on the premise that the cost is kept controllable, the interlayer performance, the impact resistance and the energy absorption characteristic of the composite material are remarkably improved by optimizing the three-dimensional combination mode of the warp yarns, the weft yarns and the Z-direction yarns at each stage, and the synergistic enhancement of mechanical properties is achieved.

The invention discloses a nano-modified fiber reinforced 3D printing magnesium phosphate cement-based material as well as a preparation method and application thereof. The material is prepared from the following components in parts by weight: 40 to 70 parts of dead burned magnesium oxide, 10 to 25 parts of basic hydrogen phosphate, 5 to 25 parts of silica fume, 30 to 60 parts of fine aggregate, 10 to 30 parts of water, 0.1 to 1 part of fiber dispersing agent and 0.5 to 5 parts of nano modified fiber, the surface activity of the fiber is remarkably improved through a nano modification process, active SiO2 sites attached to the surface of the fiber are activated by using an alkali solution, and a hydration product is generated in situ, so that the interface bonding strength between the fiber and a cement matrix is enhanced, and the surface strength of the fiber is improved by relying on the high-rigidity characteristic of the fiber. The yield stress, thixotropic property and constructability of the material are effectively improved, structural deformation in the printing process is remarkably inhibited, and the 3D printing material has excellent rheological property, strengthened mechanical property and tough fiber-matrix interface bonding property.

The invention discloses a high-rigidity three-degree-of-freedom anthropomorphic joint driven by passive decoupling of a rope. The anthropomorphic joint comprises a supporting frame and two sets of rope driving assemblies arranged on the two sides of the supporting frame. The rotary rope drive assembly is arranged at the front end of the supporting frame, the parallel mechanism assembly is installed at the front end of the rotary rope drive assembly, and the motion decoupling assembly is installed at the central axis position of the whole joint. Wherein the two rope drive assemblies are frame bodies which are driven by ropes to move front and back; the rotary rope drive assembly is a rotary table driven by a rope to rotate around the axis of the supporting frame, and the joint rotary freedom degree is achieved. According to the parallel mechanism assembly, two sets of motion branch chains are combined with frame bodies on the two sides to control pitching and yawing of the movable platform. And passive decoupling between the rotary motion and the pitching and yawing motion of the movable platform is realized through the motion decoupling assembly. According to the three-degree-of-freedom anthropomorphic joint, the three-degree-of-freedom driving ropes are passively decoupled, high rigidity is still kept under the condition that a low-load rope is used, the structural design is compact, the characteristic of decreasing progressively from the near end to the far end is shown, and the three-degree-of-freedom anthropomorphic joint is mainly used for wrist joints and ankle joints of anthropomorphic robots.

An annular cantilever beam spring is capable of exhibiting low friction and hysteresis and stiffness and specifically stiffness / volume far exceeding currently available COTS springs. The spring includes first and second sets of N stand-offs evenly positioned around opposing top and bottom surfaces of a flat annular beam at 360 / N degree intervals and angularly offset with respect to each other by 360 / 2N degrees such that each said stand-off is evenly spaced between adjacent pairs of stand-offs on the opposing surface. The first and second sets of stand-offs are responsive to opposing axial loads to deflect the flat annular beam axially at each stand-off in opposing directions to induce a curvature to the annular beam and store energy in the beam. The spring stiffness is determined by the elastic material properties of the flat annular beam, not the initial geometry as is common with the COTS springs.

The present invention discloses a passive anti-shock parallel platform, comprising a dynamic platform, a variable damper, a variable stiffness isolator, a static platform, a lower ball seat, an overshoot protector, and an upper ball seat. The dynamic platform is connected to an inertial navigation device, and the static platform is connected to a ship hull. The dynamic platform and the static platform are connected via a variable damper and a variable stiffness isolator. The lower ball seat is disposed on the surface of the static platform, and the upper ball seat is disposed on the surface of the dynamic platform. Through the synergistic effect of the variable damper and the variable stiffness isolator, the present invention enables the platform to efficiently absorb and consume impact energy. The damping force of the variable damper increases with the increase in displacement of the offset equilibrium position, effectively weakening the response of the dynamic platform and quickly helping it return to the equilibrium position. The multi-stage vibration isolation design of the variable stiffness isolator enables the platform to absorb the initial impact energy with a lower stiffness when impacted, and then limit the generation of large displacement with a higher stiffness, further improving the impact resistance.

The invention relates to the field of humanoid robots, in particular to a two-connecting-rod driving mechanical joint simulating rotation of human soles. According to the two-connecting-rod driving mechanical joint simulating rotation of the human foot sole, on the basis that high rigidity, movement precision and bearing capacity are guaranteed, swinging of the human foot sole is simulated by adding one freedom degree, and the two-connecting-rod driving mechanical joint is simple in structure and good in supporting performance. According to the technical scheme, the invention discloses a two-connecting-rod driving mechanical joint simulating rotation of a human sole. The top end of the shank is connected with a knee joint, the foot body is connected to the bottom end of the shank through a first hooke joint, and the sole is connected with the foot body through a first rotating pair. The sole driving branch is connected between the foot main body and the sole; and the two ankle driving branches are positioned on the left side and the right side of the shank and are respectively connected with the shank and the foot main body.

A stack structure (90), a display module (2), an electronic device (1), an impact-resistant layer and a preparation method, relating to the technical field of display. The stack structure (90) comprises a protective layer (91) and impact-resistant layers. The elastic modulus of each impact-resistant layers is less than the elastic modulus of the protective layer (91), the hardness of each impact-resistant layer is greater than the hardness of the protective layer (91), and / or the rigidity of each impact-resistant layer is greater than the rigidity of the protective layer (91). The protective layer (91) and the impact-resistant layers are connected by bonding or in other manners. Therefore, the compression resistance characteristic of a high-hardness and / or high-rigidity material is combined with the impact resistance characteristic of a high-elastic-modulus material, to improve the reliability of the stack structure (90). The stack structure (90) is directly connected to a display screen (20) by means of an adhesive layer, such that a display surface layer + cover plate structure is not required any more, and the architecture of the electronic device (1) can be simplified.

The present invention discloses a concentric circle-based six-degree-of-freedom adjustable dynamic variable stiffness device, comprising an upper platform, an upper mounting angle seat, an adjustable dynamic variable stiffness mechanism, a lower mounting angle seat and a lower platform. The upper end of the adjustable dynamic variable stiffness mechanism is connected to the upper platform via the upper mounting angle seat, and the lower end of the adjustable dynamic variable stiffness mechanism is connected to the lower platform via the lower mounting angle seat. The device is based on a multi-degree-of-freedom parallel configuration and is composed of six identical adjustable dynamic variable stiffness mechanisms. The adjustable dynamic variable stiffness mechanism can be adjusted to two states: adjustable dynamic low stiffness and adjustable dynamic high stiffness, thereby forming an adjustable dynamic variable stiffness mechanism.

The invention relates to the technical field of CNC machine tools, and discloses an electric actuator for a CNC machine tool, the electric actuator comprises a harmonic reducer, the right end face of the harmonic reducer is fixedly connected with a motor shell, and the right end face of the motor shell is fixedly connected with a bottom shell. According to the electric actuator for the CNC machine tool, through the application of the harmonic reducer, high-precision and high-rigidity transmission is achieved, the requirements of the machine tool for position precision and dynamic response in the complex machining process are met, the hollow shaft enables the actuator to be compact in structure, electrical elements can be conveniently integrated into the limited space of the CNC machine tool, nitrile rubber and fluororubber are selected as the sealing rings, and the sealing performance is good. Oil resistance and solvent resistance under different working conditions are respectively guaranteed, the cable connector is made of engineering plastics, durability and appearance quality of the actuator are improved while electrical performance is guaranteed, the structural strength of the actuator is enhanced due to the design of the support and the reinforcing ribs, the actuator can bear larger load and vibration, and overall reliability is improved.

The rigidity improving device comprises a wedge block and a screw, the wedge block is a block-shaped body, the two sides of the wedge block in the width direction are both provided with radians, and the radians of the two sides of the wedge block are consistent; the section of the wedge block is an inverted right trapezoid; one side of the wedge block in the width direction is a vertical surface, the vertical surface of the wedge block is a working surface, and the working surface faces the excircle surface of the main shaft; the other side of the wedge block in the width direction is an inclined surface, the inclined surface of the wedge block is a second working surface, and the second working surface is matched with the inclined surface of the workbench base; the two sides of the top of the wedge block in the length direction are each provided with a combining hole in the vertical direction, and the interiors of the combining holes are each in threaded connection with a screw. A dismounting hole in the vertical direction is formed in the middle position of the top of the wedge block between the two fastening holes; the six wedge blocks are evenly arranged in the circumferential direction of the main shaft at intervals. The rigidity of the main shaft can be effectively guaranteed and improved, and meanwhile the working precision and stability of a machine tool are guaranteed.

The invention relates to a variable impedance control method for a wrist joint rehabilitation training robot, and the method comprises the steps: constructing a self-adaptive reference stiffness correction model, inputting the rehabilitation score of a patient and the real-time muscular tension of each motion dimension of a wrist joint, and outputting the self-adaptive reference stiffness of each motion dimension; constructing a composite cost function which comprises a contact force safety threshold penalty term model and an impedance parameter change rate penalty term model; and constructing an uncertainty weighted correction model, inputting the composite cost value, the state prediction result and the patient rehabilitation score, and outputting the weighted instantaneous cost. Through the composite cost function and the dynamic impedance adjustment strategy, the impedance adjustment characteristic of the human arm is simulated, high-rigidity rapid approaching in the non-contact stage, low-rigidity high-damping buffering in the contact stage and low-rigidity low-damping compliant control in the stable stage are achieved, and the training comfort and safety are improved. According to limb impedance characteristics, rehabilitation stages and training tasks of patients, personalized requirements and dynamic rehabilitation scenes of different patients can be adapted.

The utility model belongs to the field of aircraft structure design, and particularly relates to a high-rigidity shear angle sheet structure which comprises a turned-over edge, a web plate, vertical ribs and edge strips. The flange, the vertical ribs and the edge strip define a whole ring structure, the web plate is integrally connected to one end of the whole ring structure, the flange is located on the outer side of the whole ring structure, the two sets of vertical ribs are symmetrically arranged on the two sides of the flange, and the edge strip is correspondingly arranged on the inner side of the whole ring structure; the outer walls of the vertical ribs are connected with the stringer, and the vertical ribs are arranged between the adjacent vertical ribs on the two sides of the stringer. The turnup, the web plate, the vertical rib, the edge strip and the supporting column are designed to be equal in height at the notch of the stringer, so that a thin neck structure is avoided. When the load is large, the phenomenon of stress concentration on the shearing angle piece is avoided. The rigidity of the wing rib at the position of the shearing angle piece is improved by changing the structural form among the traditional wing rib shearing angle piece, the edge strip and the supporting column, and then the structural strength requirement is met.

The utility model provides a kind of arc hollow injection molding part, including hollow injection molding part main body, integrated guide rail seat and arch truss, hollow injection molding part main body is opened with arc cavity, arch cavity is integrally injection molded with arch truss, arch truss left and right ends are integrally provided with connecting bent plate, this design solves the single function of the known arc hollow injection molding part inside, and single-layer hollow structure is directly formed by traditional injection molding process, there is no reinforcing rib or support structure inside, leading to insufficient rigidity, prone to deformation or cracking problem, the utility model is through built-in arch truss structure, imitates bridge mechanics principle, with least material greatly improves the bending and torsional stiffness of part along radian direction, effectively prevent deformation and vibration, realize the unity of light weight and high stiffness, again cooperate integrated type clamping groove guide rail to allow wiring harness, sensor or other functional module can be directly slidably installed without additional tool, assembly efficiency is very high.

This invention discloses a method for near-net-shape forming of complex thin-walled irregular-shaped rings based on a dissimilar material cladding, relating to the field of material plastic forming technology. The method includes: determining the required blank material and cross-sectional allowance of the same material for ring rolling forming of the target ring; determining the dissimilar material cladding based on the cross-sectional allowance; the dissimilar material having a higher stiffness than the blank material; fabricating the blank material and the dissimilar material cladding; covering the blank material with the dissimilar material cladding and performing ring rolling to obtain an initial ring; and removing the cladding from the initial ring to obtain the target ring. This invention solves problems such as buckling instability, loss of dimensional accuracy, uneven wall thickness, excessive ellipticity, and large subsequent machining and low material utilization under large allowance design during the rolling process of thin-walled rings. It achieves high-precision near-net-shape forming of large-diameter, thick-walled titanium alloy irregular-shaped rings, improving material utilization and reducing material costs.

A powered base assembly includes first and second structures that are operably interconnected by at least three legs that can include electrically-powered linear actuators. Each electrically powered actuator includes a housing and a rod associated with the housing. Each rod is connected to one of the first and second structures by a swivel joint having two degrees of freedom, and each housing is connected to the other of the first and second structure by a swivel joint having one degree of freedom. The linear actuators can be actuated to thereby change at least one of an angular position of the first structure relative to the second structure and a distance of the first structure, relative to the second structure. In this way, the base assembly may be used for leveling or moving a payload placed on the first structure; the payload weight is transferred linearly through the legs to the second structure. The configuration of the legs and the second structure enable to the second structure to be placed on a surface to support the base assembly while minimizing the bending moment on the second structure.

The invention belongs to the field of black metal materials, and particularly relates to high-toughness and high-rigidity saw blade steel and a manufacturing method thereof. The steel comprises the following chemical components in percentage by weight: 0.42 to 0.55 percent of C, 0.2 to 0.4 percent of Si, 0.9 to 1.4 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.5 percent of Cr, 0.0005 to 0.0030 percent of B, less than or equal to 0.3 percent of TiB2, 0.010 to 0.015 percent of B / TiB2 and the balance of Fe and inevitable impurities. According to the saw blade steel, the rigidity is larger than or equal to 9005N / m, the yield strength is larger than or equal to 1217MPa, the tensile strength is larger than or equal to 1580MPa, the ductility is larger than or equal to 17%, the room-temperature impact energy AKV is larger than or equal to 96J, the hardness is 42-48HRC, and the quenching hardness of a tooth tip is larger than or equal to 58HRC.

The application provides a large-scale light-weight high-strength high-rigidity vibration test tool optimization design method, which comprises the following steps: completing initial sample design of the vibration test tool; adopting finite element simulation calculation to optimize size parameters of the vibration test tool; completing joint simulation of the vibration test tool and a connected product to complete structure and size checking of the vibration test tool.

This invention relates to a humanoid robot, specifically a parallel rotating mechanical joint based on a ring-shaped guide rail, mimicking the rotation of a human neck. The aim is to provide a parallel rotating mechanical joint based on a ring-shaped guide rail to achieve three degrees of freedom in the movement of a biomimetic human neck joint while ensuring high rigidity and motion accuracy. Furthermore, the joint features a simplified structure, good support performance, and sufficient movement space for the neck joint. The technical solution is a parallel rotating mechanical joint based on a ring-shaped guide rail, characterized by: a head motion platform, a neck ring-shaped guide rail base, and three PSS (Personal Stability Support) link branches connected in parallel between the head motion platform and the neck ring-shaped guide rail base; the center of the head motion platform and the center of the neck ring-shaped guide rail base are connected by a composite rotating shaft.

The present invention discloses a multi-scale structural design method for a self-healing composite material with a high energy dissipation modulus. After epoxy resin and glutaric anhydride are cross-linked and cured, an ester exchange reaction occurs under the catalysis of zinc acetylacetonate to obtain a self-healing resin, so that the macromolecules of the exchangeable network exhibit complementary and interlocking interactions, forming an intermolecular thermodynamic equilibrium state; nanoparticles are used as fillers and doped into the self-healing resin matrix to improve the stiffness and damping performance, thereby serving as a structural damping phase material; cast iron is used as the structural phase material, and the energy of the bending wave is concentrated at the minimum thickness through a structural phase whose thickness gradually changes according to a power law function, generating dynamic deformation. This deformation is pressed into the structural damping phase, causing the structural damping phase material to relax, generate inelastic deformation, dissipate mechanical energy, and complete irreversible energy dissipation. The structural phase using cast iron as the material ensures the stiffness performance of the material, thereby achieving improved damping performance while ensuring high stiffness of the material.

The utility model discloses a high-rigidity gear box bearing, which belongs to the technical field of bearings and is characterized by comprising a gear box bearing outer wall body, and a gear box bearing inner wall body is arranged in the gear box bearing outer wall body. A sealing cover is arranged between the opposite sides of the gear box bearing outer wall body and the gear box bearing inner wall body, and a plurality of balls are arranged between the opposite sides of the gear box bearing inner wall body and the gear box bearing outer wall body. Reinforcing mechanisms are arranged in the gear box bearing inner wall body and the gear box bearing outer wall body; the reinforcing mechanism comprises a reinforcing ring, a corrosion-resistant layer and a wear-resistant layer, and the reinforcing ring is arranged in the gearbox bearing outer wall body, so that the problems that the gearbox bearing inner wall and the gearbox bearing outer wall are made of a single material, the gearbox bearing is easy to deform or excessively wear after being loaded for a long time, and the service life of the gearbox bearing is prolonged are solved. And the service life is influenced.

The application discloses a six-axis five-linkage gantry machining center precision stiffness forward design method and belongs to the technical field of machine tool equipment design and manufacturing. The method aims at the problems of large multi-process clamping error, high stiffness and precision prediction deviation of heavy-load machining centers, and unbalanced cost of tolerance distribution for large-size components such as liquid rocket composite cabin sections. First, the overall structure is completed based on the machining requirements of the composite thin-walled cabin section, the inner support cabin section and the fairing rear cone section. Then, the feature static stiffness modeling, the joint surface fractal dynamic stiffness matching and the tolerance-cost multi-objective precision distribution design are carried out in parallel. Finally, the overall scheme is output. The overall stiffness and precision prediction error is controlled within 8% by the method, the composite component IT9-level machining requirements are met, and the research and development cycle is effectively shortened and the production cost is reduced.

The present application relates to the technical field of tire overall preparation, and proposes a variable stiffness tire and a tire overall preparation device, which can adapt to various driving conditions and realize the collaborative optimization of comfort and control performance, and the structure can effectively disperse flexural stress, and is not prone to heat accumulation, bulging and cracking, thereby significantly improving high-speed durability and load capacity, and the matching tire overall preparation device can adapt to the molding process of the tire body, effectively improve tire production efficiency and manufacturing precision, and comprises a tire body and a triangular rubber ring, wherein the tire body comprises a tread, a sidewall and an inner tire ring, the sidewall is divided into a shoulder section, a sidewall middle section and a bead section in the radial direction, the stiffness of the bead section, the shoulder section and the sidewall middle section decreases in turn, the sidewall middle section is a main flexible deformation area, the shoulder section provides lateral restraint, the bead section provides high stiffness support, the tread is fixedly connected with the shoulder section, and the inner tire ring is fixedly connected with the triangular rubber ring.

The present invention provides a three-way adjustable test loading system, comprising a test piece, a gravity balance system, a follow-up loading system, and a load-bearing ground rail; the test piece is mounted on the load-bearing ground rail; the gravity balance system comprises an airbag and a bending, shear, and compression coupling loading fixture, which is arranged on the top of the test piece, and the airbag is used to balance the gravity of the gravity balance system; the follow-up loading system comprises a lateral load-bearing column, an adjustable loading system, and a loading member; the lateral load-bearing column is arranged in the loading direction of the test piece; the load of the loading member is transmitted to the bending, shear, and compression coupling loading fixture via the adjustable loading system; the adjustable loading system is mounted on the lateral load-bearing column, and its position and height are determined by the loading point position of the bending, shear, and compression coupling loading fixture. The present invention utilizes the high rigidity characteristics of the load-bearing ground rail and the lateral load-bearing column to concentrate the distributed load in the height direction of the test piece at the top for loading, thereby facilitating follow-up adjustment of the load loading direction and improving the accuracy of the test loading.

The invention belongs to the field of motion platforms, and particularly relates to a high-rigidity box structure for a large motion platform, which comprises a high-rigidity box structure module and a frame structure arranged outside the high-rigidity box structure module, and a guardrail is arranged on the edge of the upper part of the frame structure; according to the invention, the mode of combining the high-rigidity box structure module and the frame type welding structure is adopted in the large motion platform, so that the weight of the platform is greatly reduced while the strength and the rigidity are met.