239 results about "High stiffness" patented technology

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.

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 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 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 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 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.

The application discloses a novel human-simulating flexible parallel wrist joint with redundant driving, and has the characteristics that the joint comprises a moving platform (1), an intermediate branch chain (2), a first driving branch chain (3-1), a second driving branch chain (3-2), a third driving branch chain (3-2) and a base (4). The application is based on bionics and bionically designs the bony structure and muscle system of a human wrist joint, adopts a rope driving mode, has a high stiffness bearing ratio, is driven redundantly and has good human-machine interaction performance. The joint can be pulled by three motors through external ropes, converts the rotation of the motors into the movement of the ropes through a movable pulley, realizes 2-DOF (degree of freedom) movement, and is suitable for occasions such as the end wrist joint of an industrial robot, a human-simulating arm wrist joint and an intelligent prosthesis.

The invention belongs to the technical field of digital orthodontic medical instruments and additive manufacturing, and discloses an anisotropic stress application unit of an invisible orthodontic appliance and an additive manufacturing method of the anisotropic stress application unit. The unit comprises a miniaturized rigid base structure located at the gingival end and a parameterized mechanical control panel connected to the upper portion of the miniaturized rigid base structure; wave geometric parameters and material attributes are optimized through a deep neural operator (FNO), and anisotropic biomechanical response is given to the unit. Longitudinal waves provide constant horizontal resilience force through the accordion effect to close and develop gaps. The transverse waves provide vertical thrust by utilizing the Euler anti-buckling strut effect so as to lower or raise teeth; the oblique waves and the buccal-lingual asymmetric stiffness distribution are used for generating a composite vector force and a couple moment. The limitation of a traditional hot-pressing film process is broken through, high-rigidity structure forming under the limit size of 0.5 mm is achieved, and a negative gap maintainer is converted into an active intelligent treatment system.

The present application relates to a kind of flexible composite curved surface structure and its preparation method, by reasonable forming process, multiple materials are compounded together, give full play to the advantage of component material, make up for each other in performance, form synergistic effect, so that flexible composite curved surface structure has high rigidity, high strength, to meet the use requirement under complex condition, solve the full coverage, full movement process protection requirement, can give consideration to deformation and bearing requirement, suitable for special protection of special-shaped curved surface component, meet the use condition of multiple working conditions, realize the surface protection of full coverage and real-time sticking under multiple movement states, reach the effect of full protection.

This invention relates to the field of sealing component punching technology, specifically a 3D sealing component punching device, including a punching frame and a movable sealing cover. The punching frame is internally equipped with a punching support unit and a punching adjustment unit. This invention uses a limit servo cylinder to push the movable limit frame downwards, causing the upper and lower support frames to form an upper and lower clamping support. At this time, a high-pressure air pump inside the metal frame inflates the rubber airbag. The airbag expands and compresses the internal granular filling layer. Utilizing the phase change effect generated by the dramatic increase in inter-particle friction, the originally loose and flowing granular layer instantly solidifies into a high-rigidity solid. The outer elastic film then tightly adheres to the complex curved surface of the 3D sealing component, solving the technical problem that traditional rigid clamps cannot adapt to irregular curved surfaces and are prone to damaging soft sealing surfaces. It achieves rapid switching from flexible wrapping positioning to rigid locking support, ensuring zero workpiece deformation and uniform distribution of support force at the bottom of the hole during the punching process.

The utility model relates to the technical field of side-hung vibration fixtures, in particular to a high-rigidity side-hung vibration fixture, which comprises a frame body, a mounting plate is fixedly mounted in the frame body, a test piece is movably mounted on the front surface of the mounting plate, the frame body comprises a bottom plate, a rear plate is fixedly mounted on the back surface of the bottom plate, and the test piece is movably mounted on the rear plate. A middle support plate is fixedly mounted in the middle of the bottom plate on the front side of the rear plate, and side plates are fixedly mounted on two sides of the upper surface of the bottom plate on two sides of the front side of the rear plate respectively; the back face of the mounting plate is fixedly connected with the middle supporting plate, the two sides of the mounting plate are fixedly connected with the side plates respectively, the steel bushings are fixedly mounted on the front face of the mounting plate in a rectangular array mode, and holes are formed in the four corners of the test piece respectively, and the test piece is arranged on the steel bushings in a sleeving mode. The side hanging type vibration clamp has the advantages of being high in structural stability, large in rigidity and good in damping performance, and solves the problem that a traditional side hanging type vibration clamp is low in fundamental frequency and prone to resonance to cause test failure.

The invention belongs to the technical field of aerospace composite materials, and particularly discloses a wing skin sandwich structure of a composite material and a preparation method of the wing skin sandwich structure. The sandwich structure comprises a panel and a core material, the core material is a chopped plant fiber tow, and plant fiber fabric and carbon fiber or glass fiber fabric are sequentially and symmetrically arranged on the two sides of the core material. Through the sandwich structure design of the composite material, the bending strength and the impact energy are improved while the light weight is maintained, the maximum bending strength is improved to 268 MPa, and the maximum impact energy reaches 66 kJ / m. The outer layer high-modulus carbon fiber / glass fiber fabric provides high rigidity and in-plane strength, and the inner layer plant fiber fabric and the chopped strand absorb energy synergistically, so that the contradiction that the overall performance is reduced due to natural fiber replacement is effectively solved; the raw material cost is remarkably reduced by introducing a large amount of plant fibers, and the structure is environment-friendly.

The utility model relates to the technical field of precise instruments, in particular to a high-rigidity resonance rod, which comprises a barrel and a mounting bottom surface, a connecting structure is arranged at the top of the barrel, and the mounting bottom surface is connected to one side, far away from the connecting structure, of the barrel. A connecting ring, an inner ring and a mounting ring are sequentially arranged on the side wall of the cylinder body in a step shape in the direction from the connecting structure to the mounting bottom surface, the connecting ring, the inner ring and the mounting ring are coaxially arranged, and a mounting hole is coaxially formed in the mounting bottom surface relative to the cylinder body; a mounting sleeve is connected to the periphery of the barrel, and a mounting block is arranged on the mounting sleeve and faces the mounting bottom face. According to the utility model, on the premise that the mass is not greatly increased, the structural rigidity is obviously improved, and meanwhile, good frequency stability and high quality factor are kept, so that the increasingly improved performance requirements in the modern precision measurement field are met.

The invention relates to a lattice structure performance characterization and optimization design method based on laser powder bed melting, and belongs to the technical field of additive manufacturing and structural design. The method aims at improving the mechanical property of a traditional BCC lattice structure under complex loads. The equivalent Young modulus of the lattice structure can be effectively represented by providing a lattice performance characterization method based on large unit cell hypothesis and establishing an analytic relationship between the equivalent Young modulus and the relative density of the lattice. In addition, topological optimization design of the BCC dot matrix is carried out by adopting an SIMP method, and redundant struts are removed and the structural shape is optimized by taking maximization of the equivalent Young modulus of the dot matrix as an optimization target. Finally, compared with a traditional BCC dot matrix, the T-BCC dot matrix structure manufactured through the LPBF process shows higher rigidity and strength. According to the optimization design method, the compression resistance of the lattice structure can be improved on the premise that the light weight of the lattice structure is kept, and the method has wide application prospects in the field of high-end equipment such as aerospace and automobiles.

The invention provides a reconfigurable parallel mechanism capable of switching joint rehabilitation modes and a design method thereof.The reconfigurable parallel mechanism comprises a first motion branch chain, a second motion branch chain, a third motion branch chain, a movable platform and a fixed platform, and the movable platform is connected with the fixed platform through the first motion branch chain, the second motion branch chain and the third motion branch chain; the first motion branch chain and the second motion branch chain are both of a CRC structure, the third motion branch chain is of a CCC structure, and motion pairs, fixedly connected with the movable platform and the fixed platform, of all the motion branch chains are vertically symmetrical along the middle plane. By means of rapid switching of a two-rotation and one-movement ankle joint rehabilitation mode and a two-movement and one-rotation knee joint rehabilitation mode, configuration reconfiguration of the parallel mechanism is achieved, operation is simple, the motion trail of the reconfigurable parallel mechanism coincides with the joint motion axis, and the parallel mechanism has the advantages of being high in rigidity and precision.

This invention discloses a frame decoupling structure and a MEMS resonant gyroscope incorporating it, belonging to the field of microelectromechanical systems (MEMS) technology. The frame decoupling structure is a centrally symmetric structure, comprising a drive decoupling frame and a detection decoupling frame. The drive decoupling frame is connected to a fixed anchor point via a first elastic support structure with low stiffness in the drive direction and high stiffness in the detection direction, and is connected to a mass block via a second elastic support structure with high stiffness in the drive direction and low stiffness in the detection direction. The detection decoupling frame is connected to the fixed anchor point via a third elastic support structure with low stiffness in the detection direction and high stiffness in the drive direction, and is connected to the mass block via a fourth elastic support structure with high stiffness in the detection direction and low stiffness in the drive direction. This design physically separates the mechanical paths of drive and detection using anisotropic stiffness beams, thereby effectively suppressing orthogonality errors and improving the gyroscope's performance and production yield.

The application discloses a kind of aerodynamic quasi-zero stiffness vibration isolator based on flat fold paper structure, to provide a kind of simple structure, versatile and adjustable vibration isolation device.The vibration isolator is switched between flat mode, quasi-zero stiffness vibration isolation mode and high stiffness support mode by air pressure adjustment, can effectively isolate low-frequency vibration and meet the demand of high load support.The paper structure design is light and easy to fold, convenient for transportation and storage, while using lightweight high-strength materials, ensuring good stability and durability.Compared with traditional vibration isolator, the application has significant adjustability, versatility and cost-effectiveness, suitable for aerospace, precision instruments, transportation and other fields, providing an innovative solution for vibration control.