88 results about "Rotation symmetry" patented technology

A stereostructure spacecraft of the present invention comprises multiple deployable beam members, multiple tension members, and a spacecraft for storing the deployable beam members and the tension members. The stereostructure spacecraft is formed by deploying the deployable beam members and the tension members around the spacecraft. The deployable beam members stored in the spacecraft are deployed and arranged equidistantly in directions of multiple rotational symmetry axes, the rotational symmetry axes being rotational symmetry axes of a virtual polyhedron that is formed to have a substantial center of the spacecraft as an origin. The tension members support two end portions of two adjacent deployable beam members with tension. The respective end portions of the deployable beam members are simultaneously supported by three or more of the tension members.

A circularly polarized antenna includes a plurality of radiation units configured in a rotational symmetry manner, and a feed network connected to the plurality of radiation units. Each radiation unit comprises a patch element and a short circuit wall which is connected with the patch element and is suitable for enabling the patch element to be short-circuited. Different from the traditional sequential phase feed, the sequential phase feed only depends on the physical length of the delay line to realize the phase change, and the reactance loading feed line ingeniously utilizes the equivalent capacitance and inductance to change the phase. The method does not need to depend on a long delay line, and stable phase difference can be realized in a wide frequency band.

A technique for determining an angular orientation between a non-rotationally symmetric working end of a first part of a tool and a tool tracker carried by a second part of the tool is described. The first tool part is configured to be fixed to the second tool part in one of multiple angular orientations and comprises a reference structure. The reference structure is traceable by a tracked pointer and has a predefined angular relation to the working end. A method implementation of the technique comprises receiving first position data indicative of one or more positions of the tool tracker, receiving second position data indicative of pointer positions while the pointer is tracing the reference structure, and determining, based on the received first and second position data and the predefined angular relation between the reference structure and the working end, the angular orientation of the working end relative to the tool tracker.

The present invention relates to a tool for measuring the roundness of a rotationally symmetrical non-complete spherical surface and a method for using the tool. In view of the spherical forming characteristics of rotationally symmetrical non-complete spherical parts, the tool is used to measure the roundness error of a circular cross section that passes through the center of the sphere and intersects the equator at the largest possible deflection angle, thereby achieving accurate detection and identification of the spherical accuracy of such parts. The tool belongs to the field of bearing detection technology, wherein the tool comprises a workbench base, an angle adjustment mechanism, an angle locking mechanism, and a sliding workbench. The tool includes a roundness meter workbench, a differential cylinder, a core shaft, a measuring rod, and other components. Through the coordination of the coarse adjustment knob in the angle adjustment mechanism and the differential cylinder, rapid and precise adjustment of the workpiece's tilt angle and the position of the sphere center can be achieved, and the roundness detection cross section that envelops the spherical error as much as possible can be determined, ensuring that the roundness meter's central axis can accurately pass through the workpiece's sphere center. The tool provided by the present invention has a compact structure, flexible adjustment, and high measurement accuracy, overcoming the limitation that traditional roundness meters can only perform horizontal measurements.

To provide a workpiece holder capable of measuring a position and a direction of a held workpiece.SOLUTION: A workpiece holder (3) couples a workpiece (2) provided with reference surfaces (30) to a machining device for manufacturing a rotational-symmetrical tool having at least one geometrically defined cutting edge. The workpiece holder (3) comprises: a machining portion part configured to be connectable to the machining device in a releasable rotationally fixed manner; and a clamping portion configured to receive and clamp the workpiece (2) in a releasable manner. The clamping portion of the workpiece holder (3) comprises at least one slot (40) provided at a circumference thereof and configured to provide access to the reference surfaces (30) of the clamped workpiece (2) through the slot (40).SELECTED DRAWING: Figure 4

One aspect of the present invention is a reflector antenna provided with: a rotationally symmetric secondary reflecting mirror that is a secondary reflecting mirror having a shape (360 / n)-degree rotationally symmetric with respect to a prescribed axis serving as an axis of rotational symmetry, the prescribed axis being an axis that is prescribed; and a rotationally symmetric primary reflecting mirror that is a primary reflecting mirror having a shape (360 / m)-degree rotationally symmetric with respect to the prescribed axis serving as an axis of rotational symmetry. As compared with a reference reflector antenna, which is a reflector antenna provided with: a reference secondary reflecting mirror that is a secondary reflecting mirror having a cross-sectional shape coinciding with or substantially coinciding with a quadratic curve; and a reference primary reflecting mirror that is a primary reflecting mirror having a cross-sectional shape coinciding with or substantially coinciding with a quadratic curve, the rotationally symmetric secondary reflecting mirror has a shape obtained by rotating a part of the cross-sectional shape of the reference secondary reflecting mirror n times by (360 / n) degrees each time with respect to the prescribed axis serving as an axis of rotational symmetry, and the rotationally symmetric primary reflecting mirror has a shape obtained by rotating a part of the cross-sectional shape of the reference primary reflecting mirror m times by (360 / m) degrees each time with respect to the prescribed axis serving as an axis of rotational symmetry.

The present invention relates to a container (1) provided with a body (5) and a bottom (6), wherein the body (5) comprises a shoulder (4) and a neck (2), and the bottom (6) comprises at least one peripheral heel (7) defining a base (8), and a push-up (10); the container is characterized in that the bottom (6) comprises at least one central pin (12) having a side wall having a frustoconical overall shape that is rotationally symmetrical about the longitudinal axis X of the container (1) and the concavity of which is oriented toward the base (8), the push-up (10) extending from the central pin (12) to the heel (7) and having a height of between 11% and 18% of the base diameter ΦA, and the central pin (12) having a diameter of between 15% and 25% of the base diameter ΦA and extending above the push-up (10) by a height of between 9% and 18% of the base diameter ΦA.

The invention discloses a mechanical vibration control system configuration parameter optimization method and device based on a rotational symmetry Stewart platform, and belongs to the technical field of vibration control systems. The method comprises the steps of determining performance index requirements of a system and selecting branch chain structures according to the performance index requirements; the method comprises the following steps: selecting configuration parameters according to the characteristics of a rotational symmetry Stewart platform to obtain an optimization object, and constructing spatial vectors and Jacobian matrixes of all branched chains; constructing a simplified geometric model of the platform according to the spatial vector of each branch chain and the geometric parameters of each structure, solving the maximum outer envelope of the platform, and obtaining an optimization target; the condition number of the platform, the output force / torque of the whole platform, the minimum distance between branch chains and the characteristics of the movable table top are obtained, and a constraint function is obtained; on the basis of the penalty function, a fitness function is constructed, and an optimization parameter combination with the minimum fitness function is calculated. According to the method, the optimization result can meet various assembly and arrangement requirements of final real objects, and the engineering feasibility of the optimization design result is greatly improved.

A stereostructure spacecraft of the present invention comprises multiple deployable beam members, multiple tension members, and a spacecraft for storing the deployable beam members and the tension members. The stereostructure spacecraft is formed by deploying the deployable beam members and the tension members around the spacecraft. The deployable beam members stored in the spacecraft are deployed and arranged equidistantly in directions of multiple rotational symmetry axes, the rotational symmetry axes being rotational symmetry axes of a virtual polyhedron that is formed to have a substantial center of the spacecraft as an origin. The tension members support two end portions of two adjacent deployable beam members with tension. The respective end portions of the deployable beam members are simultaneously supported by three or more of the tension members.

The invention relates to a transparent intracorneal implant (2), which has a rotationally symmetrical shape and which has a first, anterior face (20) and a second, posterior face (21) opposite said first, anterior face, and also a centred optical axis, this implant (2) comprising a set of peripheral through-holes (22), the axis (A) of which is parallel to said optical axis, which bring said first, anterior face (20) into communication with said second, posterior face (21), characterized in that the inner wall of at least some of said peripheral through-holes (22) locally comprises an inclined surface (23), which is inclined with respect to said optical axis and with respect to a plane perpendicular to said optical axis, and in that the area (E1) of their opening (24) on the anterior face (20) side is greater than or less than the area (E2) of their opening (25) on the posterior face (21) side.

The present invention relates to a tool blade (14) having a structure (24) comprising at least two elements (22) on at least one side (26) of the tool blade (14), wherein the structure (24), together with its elements, is rotationally symmetric with respect to a rotation angle of less than 360°, particularly 180° at most, about the central blade rotation axis (R) of the tool blade (14), but is not mirror-symmetric with respect to any diameter of the tool blade (14) extending through the blade rotation axis (R). The present invention also relates to a tool mounting section (12), a tool blade system (15), and a power tool (10). The tool enables particularly safe operation.

The invention relates to a guide cage (40) intended to be positioned at least partially between two rings, one of which is a rotating ring rotatable relative to the other ring about an axis of rotation, the two rings forming two opposing contact tracks, each of which is rotationally symmetrical about the axis of rotation. The guide cage (40) comprises an annular body (62) forming at least one unit (66) intended to receive a rolling contact body (35), the guide cage (40) being characterised in that it comprises at least one movable centrifugal disengagement device (68), which is movable under the action of centrifugal force between a coupled position and an uncoupled position, in which the centrifugal disengagement device (68) is coupled to the annular body (62), and in which the centrifugal disengagement device (68) is uncoupled from the annular body (62). The coupling position is intended to be in frictional contact with the rotating ring below an angular velocity threshold of the guide cage about the reference axis, and the uncoupling position is not in contact with the two rings above a disengagement angular velocity threshold.

A stereostructure spacecraft of the present invention comprises multiple deployable beam members, multiple tension members, and a spacecraft for storing the deployable beam members and the tension members. The stereostructure spacecraft is formed by deploying the deployable beam members and the tension members around the spacecraft. The deployable beam members stored in the spacecraft are deployed and arranged equidistantly in directions of multiple rotational symmetry axes, the rotational symmetry axes being rotational symmetry axes of a virtual polyhedron that is formed to have a substantial center of the spacecraft as an origin. The tension members support two end portions of two adjacent deployable beam members with tension. The respective end portions of the deployable beam members are simultaneously supported by three or more of the tension members.

A ram clamping system (100) is provided with a rotationally symmetrical base body (110) which has an opening which passes through the rotationally symmetrical base body (110) along its axis of symmetry and in which opening a draw rod (140) runs, with a collet chuck (120) which can be clamped by means of the draw rod (140) for fixing a ram (190) belonging to the ram clamping system (100), and with an exchangeable holder (180), the interior (181) of which the ram (190) passes through before entering the collet chuck (120), in which at least a section of the collet chuck (120) projects beyond the end face of the base body (110), on which the exchangeable holder (180) is arranged, in the direction of extension of the draw rod (140) and enters the interior (181) of the exchangeable holder (180).

The invention provides a mask group plate for an ion implantation process and a use method. The mask group plate comprises a zero-layer mask plate and at least one current mask plate, at least one first overlay mark is arranged on the zero-layer mask plate, and the first overlay mark is of a first rotational symmetry structure with a first symmetry center; at least one second overlay mark is arranged at the position, corresponding to the at least one first overlay mark, of the current mask plate, and the second overlay mark is of a second rotational symmetry structure with a second symmetry center; the second symmetric center coincides with the first symmetric center, the rotational symmetry of the first rotational symmetric structure is the same as that of the second rotational symmetric structure, and the angular displacement of the second overlay mark and the first overlay mark is zero.

The invention refers to a hand-held and hand-guided random orbital polishing or sanding power tool (1). The tool (1) comprises a static body (31), a motor (15), an eccentric element (17) driven by the motor (15) and performing a rotational movement about a first rotational axis (10), and a plate-like backing pad (9) connected to the eccentric element (17) in a manner freely rotatable about a second rotational axis (16). The first and second rotational axes (10, 16) extend essentially parallel to one another and are spaced apart from one another. In order to provide for a power tool (1) particularly quiet and low in vibrations, it is suggested that at least part of an external circumferential surface of the eccentric element (17) has an at least discrete rotational symmetry in respect to the first rotational axis (10); and the power tool (1) comprises at least one first bearing (30) provided between the rotationally symmetric part of the external circumferential surface of the eccentric element (17) and the static body (31) of the power tool (1) so that the eccentric element (17) is guided in respect to the body (31) in a manner rotatable about the first rotational axis (10).

A workpiece (1) is rotationally symmetrical about an axis (L0), wherein a cross-section of a surface (5) to be polished, cut by a virtual plane encompassing the axis (L0), has an arc (5a) of more than 120° from a point intersecting the axis (L0) to one side of the axis (L0). When the workpiece (1) is polished with a rotary brush (10), the workpiece (1) is rotated about the axis (L0), and the rotary brush (10) is rotated and pressed against the surface (5) to be polished and moved along the arc (5a), while a rotation axis (L1) of the rotary brush (10) is kept perpendicular to a tangential surface of the surface (5) to be polished.When the surface to be polished (5) and the rotary brush (10) are viewed from a rotation axis direction (L1) along the rotation axis (L1), a rotation direction (R2) of the rotary brush (10) on a front side of a movement direction (M1) of the rotary brush (10) is opposite to a rotation direction (R1) of the workpiece (1).

The invention discloses a positioning device and a positioning method based on a rotational symmetry component, and belongs to the technical field of positioning detection, the positioning device comprises a workbench, an xy translation table, a placement table, a measuring instrument, a first theodolite and a second theodolite, the xy translation table can translate along x and y directions; the placing table is used for placing a to-be-tested rotational symmetry component, is arranged on the xy translation table, can translate along the x and y directions, and can horizontally rotate relative to the xy translation table; the measuring instrument is used for measuring the distance L and the rotation angle omega; and the first theodolite and the second theodolite are respectively used for measuring the rotational symmetry component to be measured. According to the positioning method, the position of the component is adjusted through the xy translation table and the placement table by taking a distance measurement result obtained by rotating the placement table for a circle as an adjustment basis and taking alignment of a datum line of a view field of the theodolite and a to-be-measured point as a basis. According to the invention, fixed-point detection can be carried out on the rotationally symmetrical component, the positioning difficulty is reduced, rapid calibration is carried out, and the positioning precision and the positioning efficiency can be obviously improved.

A technique for determining an angular orientation between a non-rotationally symmetric working end of a first part of a tool and a tool tracker carried by a second part of the tool. The first tool part is configured to be fixed to the second tool part in one of multiple angular orientations and includes a reference structure. The reference structure is traceable by a tracked pointer and has a predefined angular relation to the working end. A method implementation of the technique includes receiving first position data indicative of one or more positions of the tool tracker, receiving second position data indicative of pointer positions while the pointer is tracing the reference structure, and determining, based on the received first and second position data and the predefined angular relation between the reference structure and the working end, the angular orientation of the working end relative to the tool tracker.

Disclosed is a forced external circulation compression or expansion device intended for pseudo-isothermal transformations. The invention relates to a device that reduces the increases or decreases in temperature of the fluids (3) during these thermodynamic transformations. It consists of a fluid-tight cylinder (1), a mobile piston (2), of elongate shape free of rotational symmetries, performing the compression or expansion, a gaseous or supercritical fluid (3) undergoing this transformation, and two orifices, namely one (11) for discharging and one (10) for admitting the fluid (3). Outside the cylinder (1), the device includes a heat exchanger (4), pipes (6) and a fan (5). In the case of liquid piston, a pump or a hydraulic expander (8) ensures the displacement of the hydraulic liquid (9) via a hydraulic orifice (14). The device may include mobile, fluid-impermeable physical partitions (4), and external thermal reserves (7). The device improves the thermodynamic performance of compressors, heat pumps, ORCs, energy storage and liquefaction units.

According to the storage tank structure optimization design method and system based on the rotational symmetry model, the mechanical characteristic that the storage tank structure is rotationally symmetrical in the circumferential direction is utilized, the local model of the storage tank is established, and the speed of solving the bearing capacity through finite elements is greatly increased. On the basis, by building a storage tank structure parameter optimization process of parametric modeling, calculation, result extraction and parameter optimization, the storage tank design efficiency is greatly improved, the period of one to two months required by a traditional storage tank design method is shortened to one to two days, a fundamental breakthrough of obtaining an excellent design scheme within extremely short time is achieved, and the method is suitable for large-scale popularization and application. The method has great value for improving the rapid research and development and advanced manufacturing capability of aerospace equipment.

The invention relates to a sorter having a screen element (2) of substantially rotationally symmetrical shape, the screen element being open at its two ends (feed end and discharge end). Furthermore, a sorting-element-supporting rotor (3) is provided, the axis of rotation of which is identical to the axis of rotational symmetry, and the screen elements have different diameters between the feed end and the discharge end. As a result, a velocity difference between the sorting elements and the circumferential velocity component of the material to be sorted is maintained up to the discharge end. The sorter is characterized in that at least two rotor regions (3A, 3A', 3B, 3B'), having different diameters and associated diameter-adapted screen elements (2A, 2A', 2B, 2B'), are arranged in the axial direction, said rotor regions being rigidly connected to one another in the axial direction by means of an adapter (A, A') between the two screen elements. Thus, for example the feed-side rotor region can have a smaller diameter and the discharge-side rotor region can have a larger diameter. If the sorter operates according to the inflow principle, the rotor regions surround the screen baskets at a radial distance in the outward direction.

The invention relates to a three-blade dry type cutting curved surface machining numerical control cutter which comprises a cutter body (1) which is of a three-blade rotational symmetry structure, and is characterized in that a central air duct (9) is arranged in the center of the cutter body (1); each blade structurally comprises a chip groove (6), a blade mounting groove (7) and a semispherical cutter (5), each chip groove (6) is a groove and consists of two surfaces which are perpendicular to each other and are perpendicularly cut from the end surface of the cutter body (1), one surface is a first plane (61) perpendicular to the end surface of the cutter body (1), and the extension surface of the first plane (61) passes through the central axis of the rotational symmetry structure; the device is simple in structure and suitable for machining of curved surfaces with different curvatures, auxiliary heat dissipation of a gas medium and downward collection of cuttings can be achieved, and vibration and deformation in the machining process are reduced.

The invention relates to a roller bearing with a cage (10) which has at least one pocket (12) in which a roller (14) of the roller bearing is received and which is bounded by an axial end surface (16) that is a surface of the cage (10) and which, during operation, is in contact with a first end face (18) of the roller (14), wherein the axial end surface (16) has at least one first recess (20). It is proposed that the first recess (20), viewed from at least one point on a surface of the recess, is at least partially unbounded in a first direction (28) which is perpendicular to an axis of rotational symmetry (30) of a running surface (32) of the roller (14) and which intersects an axis about which an inner ring (34) of the roller bearing and an outer ring of the roller bearing are rotatably mounted relative to each other.

The application discloses a workpiece, and relates to the technical field of optics. In the application, the workpiece is a mask or a wafer, the workpiece has a functional area and an alignment area on a measurement plane, the alignment area is arranged around the functional area, the workpiece has a rotationally symmetric center, the alignment area has a plurality of alignment marks, one of any two alignment marks can be rotated around the rotationally symmetric center to a position coinciding with the other, and the alignment mark comprises two symmetrical sub-patterns and an asymmetrical sub-pattern arranged on the measurement plane. Each symmetrical sub-pattern has a first symmetry axis and a second symmetry axis perpendicular to each other. The asymmetrical sub-pattern is configured as a pattern asymmetric about the first symmetry axis and the second symmetry axis. The workpiece in the application has the alignment mark, so that a photolithography device can simultaneously realize direction identification and high-precision measurement, and the reliability of an alignment process is remarkably improved.

A boring head (1) comprises: a tool body (10) that has an axial core (X) and that can be mounted such that the axial core (X) is coaxial with the rotation axis of a main spindle of a machine tool; a synchronization member (40) that is accommodated in the tool body (10) so as to be rotatable; and a plurality of cartridges (20) that are attached to an end surface (14a) of the tool body (10) on the side where the synchronization member (40) is accommodated, so as to be movable in a direction perpendicular to the axial core (X), and that can hold a cutting blade (30). The plurality of cartridges (20) have, on the bottom surface thereof positioned on the side facing the tool body (10), a plurality of engagement grooves (26) formed in a direction perpendicular to the movement direction of the cartridges (20). The synchronization member (40) has a plurality of columnar engagement pins (46) engaged with the plurality of engagement grooves (26), and each of the plurality of engagement pins (46) is disposed at a position rotationally symmetric with respect to the axial core (X).

The present invention discloses a rapid analysis method for multi-dimensional uncertainty problems of a non-uniform medium rotationally symmetric body, and the steps are as follows: First, the mother plane of the rotationally symmetric body is modeled using non-uniform rational B-spline technology, reducing the previous three-dimensional volume meshing of the non-uniform medium target to two-dimensional surface meshing of the mother plane, and making the shape of the model be controlled by control points; Subsequently, a VIE-BOR matrix equation with shape and permittivity random variables is obtained by the perturbation method; Finally, different variation amounts are obtained through random sampling, and the radar cross section after the micro-variation of the shape and permittivity of the rotationally symmetric body, as well as the statistical mean and variance of the radar cross section are obtained. Compared with the VIE method, the present invention has a faster calculation speed and less memory usage, and can simultaneously handle multi-dimensional uncertainty problems of the geometric shape and permittivity of non-uniform media.

The invention provides a space vehicle, relates to the technical field of spaceflight, and solves the technical problem that tires of the space vehicle are insufficient in shock resistance in an outer space environment. The tire structure comprises a metamaterial structure formed by three planar cell elements, and each planar cell element comprises four unit structures; each unit structure comprises four arc-shaped ligaments, the four ligaments are rotationally and symmetrically distributed, and each ligament is provided with a first section close to the rotation center and a second section away from the rotation center; the first sections of the four ligaments define a quadrilateral frame, and the concave sides of the four ligaments face the rotation center; the four unit structures are connected in sequence, the two adjacent second sections of each unit structure are connected with the second sections of the two adjacent unit structures respectively, and each unit structure and the two adjacent unit structures are arranged in a mirror symmetry mode; each planar cell comprises two opposite first strips which are convex outwards and two opposite second strips which are concave inwards. The tire structure has good impact resistance.