11results about How to "Structural symmetry" patented technology

The invention relates to the field of ankle joint rehabilitation robots, in particular to a one-translation and two-rotation type parallel ankle joint rehabilitation robot and a working method. The parallel mechanism comprises a static platform, a first mixed branch chain, a second just constraint branch chain and a movable platform, and a basic kinematic chain containing two loops is formed. The mechanism only comprises a translation pair and a rotation pair, so that the mechanism has the advantages of high rigidity and good precision.

This invention discloses a polyolefin-containing DCPD epoxy resin and a copper-clad laminate composition thereof, and its preparation method. The method is characterized by: polymerizing polyallyl phenol and catalyst A at high temperature to form polyallyl phenol; then reacting DCPD, polyallyl phenol, and catalyst B at high temperature to form a polyolefin-containing DCPD phenol resin; subsequently, epoxidizing the resin with epichlorohydrin and alkaline catalyst C to synthesize a polyolefin-containing DCPD epoxy resin; finally, mixing the resin with maleimide resin, phosphorus-containing phenolic resin, imidazole accelerator, inorganic filler, and solvent to obtain the polyolefin-containing DCPD epoxy resin composition for copper-clad laminates. The polyolefin-containing DCPD epoxy resin and copper-clad laminate composition prepared by this invention exhibits low dielectric constant, low dielectric loss, and high heat resistance, making it particularly suitable as a raw material for copper-clad laminates and highly practical.

This invention discloses a heterocyclic polyarylamide-polyhydroxyarylamide precipitated fiber, its preparation method, and a heterocyclic polyarylamide-polybenzodioxazole paper, belonging to the technical field of high-performance organic fiber and paper preparation. The preparation method of the precipitated fiber includes the following steps: A. Preparation of the polymerization solution: 3,3'-dihydroxybenzyl diamine (DHB) and 2-(4-aminophenyl)-5-aminobenzimidazole (DAPBI) are dissolved in an organic solvent containing a solubilizing salt, and then terephthaloyl chloride is added to react and obtain a polymer solution with a solid content of 1-10%; B. Precipitation: After degassing, filtering, metering, and spinning, the polymer solution is mixed with a coagulation bath and precipitated to obtain the heterocyclic polyarylamide-polyhydroxyarylamide precipitated fiber. A heterocyclic polyarylamide-polybenzodioxazole paper prepared from this precipitated fiber is also provided. This invention introduces a heterocyclic polyaromatic amide structure through copolymerization, which not only improves the strength and composite properties of the cyclized PBO paper, but also maintains a decomposition temperature comparable to that of pure PBO fiber, exceeding 600℃, demonstrating excellent thermal stability. Furthermore, this method is simple and easy to implement, making it suitable for industrial production applications.

The invention provides a spatial two-rotation and one-movement three-degree-of-freedom parallel mechanism. The spatial two-rotation and one-movement three-degree-of-freedom parallel mechanism comprises a fixed platform, a movable platform and three main branch chains. Each main branch chain supports the movable platform to realize two-rotation and one-movement three-degree-of-freedom movement and comprises a first branch chain and a second branch chain; the first end of the first branch chain and the first end of the second branch chain are in spherical connection with the movable platform through equivalent spherical hinges, the second end of the first branch chain is rotationally connected with the fixed platform, and the second end of the second branch chain is rotationally connected with the fixed platform through a rotating pair. The parallel mechanism is high in bearing capacity, high in rigidity, high in fault-tolerant capability, high in reliability and high in stability, and stable supporting and stable movement of the movable platform can be achieved; spherical surface connection is achieved through equivalent spherical hinges, two-rotation and one-movement three-degree-of-freedom flexible movement is achieved only through a rotary hinge mode, and the parallel mechanism has the advantages of being large in working space, small in accumulative error, timely in motion response and high in motion output efficiency and precision.

The bipolar plate comprises two polar plates, namely an anode plate and a cathode plate, strip-shaped protrusions and block-shaped protrusions are formed on the polar plates in a punching mode, the length direction of the strip-shaped protrusions is consistent with the length direction of the polar plates, the block-shaped protrusions are arranged at the two ends of the strip-shaped protrusions in the length direction, and the strip-shaped protrusions and the block-shaped protrusions are arranged in a staggered mode. The blocky protrusions located at the two ends of the strip-shaped protrusion are symmetrically arranged, and the bipolar plate is formed after the two punch-formed polar plates are connected in a welded mode. The bipolar plate disclosed by the scheme is manufactured by adopting a mode of firstly stamping and then welding, the manufacturing mode is simple, the processing flow of the bipolar plate is simplified, excessive processing technologies and complicated dies are not needed, and the manufacturing cost and difficulty of the bipolar plate are reduced; and meanwhile, the front and back surfaces of the obtained bipolar plate are symmetrical in structure, so that the consistency of contact resistance between the bipolar plate and an electrode can be ensured.

The invention discloses a winding device, and relates to the technical field of automatic winding, and the winding device comprises four winding assemblies which are respectively located at four vertexes of a rectangle; the winding assembly comprises a mounting base, a lower die and an upper die, the lower die and the upper die can synchronously rotate around a vertical axis; the two transferring assemblies are located on the two sides of the four winding assemblies in the second direction respectively, and each transferring assembly corresponds to two winding assemblies distributed in the first direction at intervals; the transferring assembly comprises a first sliding rail, a second sliding rail, a third sliding rail and a material taking part. For the two winding assemblies which are distributed in the first direction at intervals, when one winding assembly conducts the winding process, the other winding assembly is matched with the transferring assembly to conduct the transferring process; the mounting base and the transferring assembly are located on the two sides of the upper die in the second direction, and the four winding assemblies are all arranged outwards. According to the winding device, multi-station efficient operation is guaranteed, meanwhile, the structure of the winding assembly can be simplified, and the observability and maintainability of equipment are improved.

This invention belongs to the field of vehicle vibration control technology and discloses a dual-valve, dual-capacity symmetrical integrated adjustable shock absorber, including a main hydraulic cylinder, dual electrically controlled adjustable valves, dual capacities, and symmetrical oil circuit connectors. The piston inside the main hydraulic cylinder divides the cylinder body into an upper working chamber and a lower working chamber; the dual electrically controlled adjustable valves include independently set tension-side and compression-side adjusting valves; the dual capacities are a tension stroke spiral tube and a compression stroke spiral tube, both adopting a spiral hollow high-pressure pipeline structure. The symmetrical oil circuit connectors seal and connect the main hydraulic cylinder, the two sets of adjusting valves, and the two sets of spiral capacities, forming two physically isolated, functionally independent oil circuits. This invention abandons the traditional single-valve, single-pipe coupling architecture and adopts a stroke decoupling layout. The dual valves independently control the oil flow to achieve continuously adjustable damping force, and the dual capacities provide directional capacities for their respective strokes. The valve-pipe integrated structure optimizes the oil circuit pressure transmission characteristics, enabling completely independent control of compression and tension stroke damping and capacities, overcoming the inherent defects of parameter coupling in existing technologies.

The utility model discloses a variable mode walking mechanism for all terrain vehicle, including track body, drive wheel body, action support, mobile arm assembly and hydraulic cylinder, the track body is all rubber flexible track, drive wheel body is arranged in the track body and is in contact with the inner wall of track body, action support is arranged on drive wheel body, two mobile arm assembly symmetrical arrangement is on drive wheel body and is connected with action support, two hydraulic cylinders symmetrical arrangement is on drive wheel body, and hydraulic cylinder piston end is connected with mobile arm assembly, this variable mode walking mechanism for all terrain vehicle, simple and reasonable structure, clever design, to realize different track body ground contact length and ground contact area, ensure the high passability under the soft ground, the obstacle passing performance and the high mobility performance under the hard ground, the whole structure symmetry, the processing and manufacturing aspect, system stability is good.

This invention discloses an arithmetic logic circuit suitable for balanced ternary systems, comprising a unary balanced ternary operation circuit, a balanced ternary half-adder circuit, a balanced ternary full-adder circuit, and a balanced ternary multiplier circuit. Single-input logic conversion is achieved through the combination of polarized ternary inverters and transistors. The half-adder consists of a basic unit and a transmission gate, realizing two-bit summation and carry output. The full-adder employs two cascaded half-adders and optimizes the carry path, significantly shortening the critical path and reducing the number of transistors. The multiplier uses the basic unit as the control core and combines it with a standard ternary inverter to achieve accurate multiplication. This invention overcomes the interconnection bottleneck of traditional binary logic, avoids the high hardware overhead of unbalanced ternary logic circuits in signed number calculations, and avoids the accuracy loss of approximate calculations in existing balanced ternary logic circuits. It has advantages such as simplified structure, low latency, low power consumption, and accurate operation, and is suitable for high-performance computing scenarios such as artificial intelligence, big data, and very large-scale integrated circuits.

The invention relates to the technical field of data transmission, and discloses a cross-device data transmission method and device.In cross-device data transmission, the working frequency of a first device executing sending operation is higher than the highest working frequency of a second device, and the bit width of a data interface used for sending by the first device is smaller than the bit width of a data interface of the second device. The method is applied to first equipment, and comprises the following steps: dividing original data into at least two sub-data segments with the same bit width; configuring first linear feedback shift registers with the same number as the sub-data segments to form a first driving chain; wherein the initial state of each stage of first linear feedback shift register except the first stage in the first driving chain is determined by parallel data output by the adjacent preceding stage of first linear feedback shift register in the current main clock period; and performing scrambling operation on the corresponding sub-data segments based on each level of first linear feedback shift register to obtain scrambled sub-data segments, and sending the scrambled sub-data segments to the second device.

The utility model belongs to cable manufacturing technical field discloses a direct current charging cable, including intermediate line body, elastic filling body, around the layer and outer sheath, intermediate line body includes two positive cable core, two negative cable core and an auxiliary cable core of same size and mutually twisted, intermediate line body has center gap, and elastic filling body fills in the center gap, and elastic filling body is with positive cable core, negative cable core and auxiliary cable core with arc curved surface and positive cable core, negative cable core and auxiliary cable core are pasted, and around the layer is with shape and is covered in the outer periphery of intermediate line body, and outer sheath is with shape and is covered in the outer periphery of around the layer. Such design can solve the existing direct current charging cable after using a period of time, the signal line of small line diameter, the positive line and the negative line of large line diameter, the internal copper wire is easy to break, the direct current charging cable is used, is often twisted, along with long -term use, the conductor in the internal cable core can produce deformation, influences its use safety problem.