80results about How to "Good structural symmetry" patented technology

The invention discloses a single-degree-of-freedom overconstrained shear-type deployable unit and space deployable mechanisms composed of the same. The single-degree-of-freedom overconstrained shear-type deployable unit comprises eight disc chucks, four sets of shear fork folding rods and eight sets of folding connecting rods; one set of the folding connecting rods limit the deployable degree of the basic deployable units by depending on the length of the connecting rods, the other seven sets of the folding connecting rods are all overconstrained connecting rods, and the overconstrained connecting rods can effectively improve the rigidity of the basic deployable units. Accordingly, the basic deployable units can be sequentially arranged in order, every two adjacent deployable units can form the first space deployable mechanism and the second space deployable mechanism by sharing four of the disc chucks and one set of the shear fork folding rods, and the length of the first space deployable mechanism and the size of the second space deployable mechanism can be changed by changing the quantity of the basic deployable units. The single-degree-of-freedom overconstrained shear-type deployable unit is simple in structure, has the high structural symmetry and is suitable for constructing an extendable space mast, a solar battery array support and a satellite plane reflecting antenna.

The invention relates to a nitrogen, silicon and chlorine thee-element synergic flame retardant tri{2-chloro-3-[tri(chloroethoxy)silicon acyloxy]propyl}isocyanurate compound and a preparation method thereof. The structure of the compound is shown as a formula in the specification. The preparation method comprises the following steps: dripping organic solvent solution of triglycidyl Isocyanurate into silicon tetrachloride, and reacting for 4 to 6 hours at a temperature of between 50 and 70 DEG C; and cooling to 30 DEG C, introducing ethylene oxide under the liquid surface, reacting for 2 to 3 hours at a temperature of between 45 and 55 DEG C, and purifying to obtain the tri{2-chlor-3-[tri(chloroethoxy)silicon acyloxy]propyl}isocyanurate. The compound has good flame retardant plasticization, and is suitable for flame retardant plasticizer such as polyvinyl chloride, polyurethane, epoxy resin, unsaturated resin and the like; and the method has simple production process and low cost, and is easy for industrial production.

A helical tube hot-extrusion die in porous magnesium alloy belongs to the technical field of die processing. The helical tube hot-extrusion die comprises an upper die, a middle die and a lower die, wherein, the upper die, the middle die and the lower die are sequentially sheathed and are of disk structures, and rabbets, locating pins and bolts are respectively arranged between the upper die and the middle die as well as between the middle die and the lower die for fixation. A helical flow supply mode is adopted for the upper die of the helical tube hot-extrusion die, which significantly lowers resistance formed by helical shaping of tube blank by special helical equipment when a tubular product is extruded; and a circular welding cavity is adopted for the lower die, which is beneficial for rotary welding of a magnesium alloy material of plastic flow in the welding cavity. Meanwhile, dimensional accuracy of a metal is ensured under the action of a forming cavity working tape when the metal is extruded out of the welding cavity, and the die structure has good symmetry, thus reducing non-uniformity of feed stock flow, and avoiding cracking of tube walls when a helical aperture is formed on the magnesium alloy material. The helical tube hot-extrusion die has the advantages of high preparation and production efficiency, few waste materials, good quality and being more favorable for meeting the requirements of continuous production.

The five-axis linkage serioparallel numerically-controlled machine tool is one kind of parallel machine tool superior to available six freedom parallel machine tool, which has high cost and complicated structure for five-axis motion. The five-axis linkage serioparallel numerically-controlled machine tool includes a frame; a moving platform; four link rods, each of which has one end connected to the frame and the other end hinged the operate moving platform; and one shifting work table set below the moving platform. The machine tool of present invention has high symmetry, high rigidity, high precision and high dynamic performance, no motion coupling, simple structure, low cost and easy manufacture. The present invention increases the structure forms of five-axis parallel machine tools, provides the theoretical research on four and five freedom parallel machine tools with mechanism prototype, and can realizes all the functions of available six freedom parallel machine tool.

The invention belongs to the technical field of instruments and meters, and relates to the manufacturing technology of a permanent magnetic torquer component for an inertia type instrument, in particular to a rare earth-cobalt-based radial permanent magnetic ring component and a manufacturing method thereof. The permanent magnetic ring component is made of rare earth- cobalt-based permanent magnetic alloy materials. Multiple radial magnetic pole blocks (1) are prepared through a powder metallurgy method, each radial magnetic pole block (1) has a single magnetic pole direction A, and the multiple radial magnetic pole blocks (1) are bonded and fixed to form the cylindrical permanent magnetic ring component. The permanent magnetic ring component is reliable in mechanical strength, magnetic elements can be precisely manufactured under a neutral state, the radial magnetic field of the surface of a magnetic pole after the permanent magnetic ring component is magnetized is high in strength and good in uniformity, and the problems that a radial permanent magnetic ring is low in surface magnetic performance, poor in uniformity and stability, and not high in assembling precision are solved.

The invention relates to a cooling fan for a traction converter of a high-speed electric locomotive. The cooling fan comprises a rectangular box body (5), wherein a clapboard (11) is arranged at the middle of the box body (5) to divide the box body (5) into two independent cavities, a motor (7) is installed at rear side of each cavity, and an air inlet (9) and an air outlet (8) are respectively arranged at the front side and the lower side of each cavity. The cooling fan is characterized in that the rear side of each cavity is connected with the front end of the motor (7), an impeller (4) is arranged in each cavity and is coaxially installed on the output shaft of the motor (7), and two impellers (4) rotate counterclockwise during working so as not to mutually intervene. The cooling fan provided by the invention is mainly used for cooling the traction converters of motor trains with speed per hour of more than 380 km/h, and can satisfy the requirements of resisting low-temperature impact and high-speed vibration.

A space folding and extending mechanism with double cylinders as extensible units comprises an octagonal support base, three-degree-of-freedom hinges, bevel-edge rods, first gaskets, the first air-pressure cylinders, second gaskets and the second air-pressure cylinders. The octagonal support base is fixedly connected with the three-degree-of-freedom hinges, and the bevel-edge rods, the air-pressure cylinders and the gaskets are connected through revolute pairs. Under the conditions of vibration, collision and the like in the movement process of the mechanism, the gaskets can play a damping role, so that motion shock on the mechanism is low; the mechanism has a high structural symmetry so that different large-scale space folding and extending mechanism bodies can be formed by arranging theextensible units; the space folding and extending mechanism can be used in a space station, a communication satellite platform, a space telescope and other space missions, and has the advantages of being wide in application range and high in practicability.

The invention discloses an elliptical resonance modal piezoelectric type MEMS circular ring gyroscope, which comprises a substrate provided with a concave cavity, and a circular ring harmonic oscillator and clamped beams are suspended above the concave cavity; the clamped beams are uniformly distributed along the outer side of the circular ring harmonic oscillator; the circular ring harmonic oscillator is connected with a peripheral clamped structure by means of the clamped beams, the peripheral clamped structure is fixed to the substrate, a central circle between an outer circle and an innercircle on the top surface of the circular ring harmonic oscillator is used as a reference circle, heat insulation grooves penetrating through the thickness direction are uniformly distributed along the reference circle, and top electrodes of the circular ring harmonic oscillator are differentially arranged along the inner side and the outer side of the reference circle. The elliptical resonance modal piezoelectric type MEMS circular ring gyroscope is simple in structure, small in size, easy to manufacture in batches and high in mechanical sensitivity.

The invention discloses an installation device and method for an arc-second-level three-dimensional optical deformation measurement device and aims at conducting reliable installation on the arc-second level three-dimensional optical deformation measurement device. The installation device is formed by a transmitting module installation device and a receiving module installation device, the transmitting module installation device is composed of a transmitting main lens cone, a transmitting tail adjustment support, a light source installation support, a transmitting lens pressing ring, a transmitting lens fixing cover, a diaphragm installation plate and a light source installation plate, and the receiving module installation device is composed of a receiving main lens cone, a receiving lens pressing ring, a receiving lens fixing cover, a receiving tail adjustment support and a detector installation support. A sliding control and pressure fixing mode is adopted to install an adjustment portion of the three-dimensional optical deformation measurement device. By means of the installation device and method, the measurement device can be reliably installed, the installation device has the advantages of being adjustable in accuracy, convenient to adjust, stable and reliable after adjustment and the like, and the installation device has good stability under physical conditions of changed environment temperature, changed stress states and the like.

The invention discloses a composite scissor-like hoop truss deployable antenna mechanism, which comprises N deployable mechanism units of the same structure. The adjacent deployable mechanism units are connected through sharing two upper and lower node connection members and an intermediate node connection member, and a multi-faceted hoop truss mechanism is together formed. Each deployable mechanism unit comprises two scissor rods, four connecting rods, four reinforcing rods, four upper and lower node connection members and two intermediate node connection member, and all rotating auxiliary axes connected onto the scissor rods, the connecting rods and the reinforcing rods in the same deployable mechanism unit are parallel. Motion pairs in the whole mechanism are all rotating pairs, the assembly manufacturing process is good, the structure symmetry is high, hoop truss spatial deployable mechanisms with different scales can be formed through changing the number of the deployable mechanism units and the lengths of the rods, and the antenna mechanism disclosed in the invention can be used as a support mechanism to be well applied to a spaceborne hoop truss deployable antenna.

The invention discloses a three-component force measurement sensor which is composed of an elastic body and a strain gauge. The elastic body is composed of a fixed end on the inner side of the circumference, a loading end on the outer side of the circumference and strain beams connected between the fixed end and an annular gap of the loading end. The four strain beams are distributed in the annular gap up, down, left and right; each strain beam is provided with four patch surfaces of a first axial patch surface and a second axial patch surface which are symmetrical along the axial direction, and a first circumferential patch surface and a second circumferential patch surface which are symmetrical in the radial direction; the pasting directions of the two strain gauges on the same patch surface point to the outer side of the circumference from the circle center of the sensor, and the strain gauges are correspondingly pasted on the patch surfaces of the strain beams in pairs so as to achieve stress in the horizontal radial direction, the vertical radial direction and the axial direction; and the strain gauges in the same component force direction are measured and are electrically connected to form a Wheatstone full-bridge circuit. The three-component force measurement sensor is high in sensitivity, small in inter-dimensional coupling degree and high in measurement precision.

The invention provides a prismatic multi-path power distributor/synthesizer based on a fan-shaped branch microstrip line. The prismatic multi-path power distributor/synthesizer based on the fan-shaped branch microstrip line is wholly prismatic and comprises a power distribution section and a power synthesis section, wherein the power distribution section and the power synthesis section are of the same structure, electromagnetic waves enter a cavity through an input end coaxial connector, and synthesized high-power signals are output from the cavity through an output end coaxial connector. An impedance deploy hole is punctured in a microstrip planar circuit of a fan-shaped branch power distribution/synthesis structure, the isolation among branches can be improved, the whole structure is connected through microstrip patches, and therefore the power distribution/synthesis structure can achieve a wide work frequency band. According to the requirement of actual power synthesis, by reasonably designing the size and position of the impedance deploy hole and the radius of the fan shape, equal-power distribution of all the branches can be achieved, and different power distribution/synthesis path numbers can be achieved conveniently according to the needs.

The invention discloses a cell array type single-degree-of-freedom peripheral truss expandable antenna mechanism which comprises N outer-layer single-degree-of-freedom expandable mechanism units and Ninner-layer single-degree-of-freedom expandable mechanism units, the outer-layer single-degree-of-freedom expandable mechanism units are formed by connecting inner joint connecting members, inner connecting rods, intermediate connecting rods, outer connecting rods and outer joint connecting members through rotating pairs, and the two types of single-degree-of-freedom expandable mechanism units are interspersed and arranged in an array and are connected by sharing two intermediate connecting rods, two inner joint connecting members and two outer joint connecting members to form a multi-facetedperipheral truss mechanism. The overall mechanism has a high structural symmetry, the peripheral truss expandable antenna mechanisms of different scales can be formed by changing the numbers of the inner-layer and outer-layer single-degree-of-freedom expandable mechanism units in the overall mechanism and the lengths of the rods inside, and the peripheral truss expandable antenna mechanism can beapplied to a large-caliber satellite-borne antenna well.

The invention provides a novel outer row compressed type multi-row axial plunger pump/motor, and relates to the field of axial plunger pump/motors of hydraulic machinery. The novel outer row compressed type multi-row axial plunger pump/motor comprises a shell, a cylinder body, a transmission shaft, a thrust plate, an inner swash plate and an outer swash plate; a front gland is connected with a front end cover through hexagonal screws; the front end cover is connected with the shell through hexagonal screws; the shell is connected with a rear pump cover through screws; the transmission shaft drives the cylinder body to rotate through splines, a baffle groove of the cylinder body is internally provided with a baffle, and the outer side of the cylinder body is sleeved with an outer compressedball sleeve; the outer ball surface of the outer compressed ball sleeve is hinged to the inner ball surface of an outer compressed plate, and outer row spring seats and outer row springs are installed in spring holes of the outer compressed ball sleeve; the side, close to the front end cover, of the transmission shaft is provided with the inner swash plate and the outer swash plate; and the innerswash plate and the outer swash plate are connected through swash plate positioning pins. According to the novel outer row compressed type multi-row axial plunger pump/motor, rotating bodies are of afull symmetrical structure, spring force is distributed uniformly, action baffles of the outer row springs are inserted in the cylinder body, cylinder body prepared materials are reduced, the cost isreduced, and the structure is simple and practical.

A space folding and extending mechanism with five-rod mechanisms as extensible units comprises an octagonal support base, three-degree-of-freedom hinges, pin shafts, bevel-edge rods, L-shaped rods, short rods and straight-edge rods. The octagonal support base is fixedly connected with the three-degree-of-freedom hinges, the bevel-edge rods are connected with the corresponding three-degree-of-freedom hinges through revolute pairs, the bevel-edge rods, the L-shaped rods, the short rods and the straight-edge rods are connected through the pin shafts, and the straight-edge rods are connected withthe corresponding three-degree-of-freedom hinges through revolute pairs. In the space folding and extending mechanism, each rod is composed of two rod bodies, movement pairs are all the revolute pairs, the structure is simple, the space folding and extending mechanism can be driven by motors, and the extending speed can be controlled through motor driving, and each extensible unit is high in stability and synchronism; the space folding and extending mechanism has the advantages of being low in mass, large in folding ratio, high in positioning precision, high in structural strength, high in stability and reliability, simple in structure and low in manufacturing cost, and the space folding process is simple.

A space folding and unfolding mechanism for simulating connection of a mimosa rigid hinge comprises a machine base, unfoldable units and the rigid hinge. The machine base is in a regular octagon shape. Each side of the machine base is connected with a support rod through a rotating pair. Each unfoldable unit comprises the support rods and a four-rod mechanism. One end of each support rod is connected with the machine base through the corresponding rotating pair. The two sides of each support rod are connected with the corresponding four-rod mechanism through rotating pairs. Each four-rod mechanism comprises a driving rod, a transmission rod and support connecting rods, wherein the driving rod and the support connecting rods are connected with the corresponding support rods through the corresponding rotating pairs respectively, the driving rod and the support connecting rods are connected with the transmission rod through rotating pairs. The rigid hinge is connected with the two unfoldable modules and can rotate around a rotating pair in the middle. The space folding and unfolding mechanism is light in quality, good in stability, large in folding ratio, large in structural strengthand high in reliability and precision and can be applied to aerospace tasks of communication with satellite platforms and earth observation.

The invention relates to a flame retardant dilphosphonic heterocyclic polysilicate compound and a preparation method thereof. The structure of the compound is shown as a formula in the description. The preparation method comprises the following steps of adding dimethyldichlorosilance and 2 to 2.4 mol of phosphocycloxy dimethylsilicate into an organic solvent; performing heat insulation reaction for 6 to 9h at 120 to 160 DEG C for completely exhausting hydrogen chloride; performing purification treatment; obtaining a product of the flame retardant dilphosphonic heterocyclic polysilicate. The compound provided by the invention belongs to an excellent silicon phosphorus cooperated flame retardant char forming agent which can be used as the flame retardant char forming agent of polyamide, polyester, polyurethane, polyolefin, epoxy resin, unsaturated resin and the like; the process is simple; the equipment investment is low; the industrialized production can be easily realized.