56 results about "Curve shape" patented technology

The invention relates to a calculation method and device for construction tensioning force of a hybrid-composite beam cable-stayed bridge, and the method comprises the following steps: building a full-bridge finite element model, and setting the last tensioning force as a designed finished bridge cable force; constructing a target formula including a stay cable force, a main beam tangential displacement and a main tower longitudinal deviation influence matrix; calculating a bridge forming state initial value and establishing an optimization objective function; forming an iterative loop calculation system; the cable force uniformity of stay cables on the two sides of the side midspan, the stress limit values of a main tower and a main beam and the pressure reserve of a transition pier and an auxiliary pier are controlled; and finally, the tensioning force of each time in the construction process is determined. The method emphasizes the consistency of finite element simulation and on-site construction, considers the shapes of a vertical curve and a horizontal curve of the bridge and the bending effect, and is suitable for bridges with various spans and curve forms; the method can effectively consider the concrete shrinkage and creep effect, is rapid in convergence, high in efficiency and wide in application range, meets multi-parameter constraint conditions, and ensures that a finished bridge state is closed with an ideal result.

Provided is an external meshing cylindrical gear pair with a constant meshing characteristics constructed tooth pair. The external meshing cylindrical gear pair with a constructed tooth pair includes a cylindrical gear I with a constructed tooth pair and a cylindrical gear II with a constructed tooth pair based on conjugate curves. In the present disclosure, normal tooth profile curves of the cylindrical gear I with a constructed tooth pair and the cylindrical gear II with a constructed tooth pair are continuous combined curves with the same curve shape, which facilitates machining by the same cutter. A common normal at an inflection point or a tangent point of the continuous combined curve passes through a pitch point of the gear pair, and a position of the inflection point or the tangent point can be adjusted according to an actual demand. A contact ratio is designed as an integer.

A sensing device includes a housing including a first side wall member arranged in an up-down direction with respect to a bottom surface; a first handle formed in a closed curve shape, at least a portion of which is exposed to an outside of the housing and placed on a predetermined first surface, and coupled to one side of the first side wall member so as to be capable of orbital movement along an extension direction of the closed curve at a predetermined location on the closed curve; a first rotating body rotating around a predetermined first rotation axis in conjunction with the orbital movement of the first handle; a support member coupled to the housing, and supporting the first handle such that the first handle maintains a fixed position at the predetermined location; and a first sensor sensing information on a rotational movement of the first rotating body.

The objective is to provide a catheter that can realize a desired curve shape by preventing the curving axis of the catheter distal part from twisting, and preventing the catheter from kinking and decreased pushability. Disclosed is a catheter (1) having a shaft (2); at least one wire (30); a coil (60); a leaf spring (40) having a first connection part (41) where its proximal part is fixed to a distal end part of the coil (60); and a cover tube (50), wherein the coil (60) has a fixed part (61) where it is fixed to the shaft (2) at a position proximal to the proximal end of the cover tube (50); and the length from the distal end of the fixed part (61) to the proximal end of the cover tube (60) in the longitudinal direction is a length of 20 windings of the coil (60) or shorter.

1. Name of this design product: Press pump head (smooth, hair-like curve shape). 2. Purpose of this design: For use as a press pump head for packaging bottles. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

The invention relates to a method and device for designing a spatial streamline inlet of a rotational flow separator, and the method comprises the steps: determining an inlet angle alpha, a wrap angle beta, an incident angle gamma and an overturning angle theta of the inlet of the rotational flow separator according to the performance requirements of the rotational flow separator; the method comprises the following steps: selecting a control point at a rotational flow separator, generating a basic shape of a characteristic bus of the spatial streamline inlet through a spline curve equation, then selecting a type value point to carry out iterative optimization on the bus shape, and determining a final curve shape of the spatial streamline inlet through an entrance angle, a wrap angle, an incident angle and a flip angle; based on the inlet shape of the rotating flow separator, the section shape of a space streamline inlet is designed through a Bezier curve equation; and according to the final curve shape and the section shape of the spatial streamline inlet, the spatial streamline inlet structure of the rotating flow separator is determined. Compared with the prior art, pre-separation of particles / liquid drops is achieved through fluid inertia accelerated rotation, and the separation efficiency of the hydrocyclone is improved.

The application discloses a constant engagement characteristic pair-constructing external engagement cylindrical gear pair, and relates to the technical field of gear transmission, comprising a pair-constructing cylindrical gear I and a pair-constructing cylindrical gear II based on conjugate curves. The normal tooth profile curves of the pair-constructing cylindrical gear I and the pair-constructing cylindrical gear II are continuous combination curves with the same curve shape, facilitating machining with the same cutter; the common normal line at the inflection point or the tangent point of the continuous combination curve passes through the node of the gear pair, and the inflection point or the tangent point position can be adjusted according to actual requirements to adjust the sliding rate of the gear pair; the coincidence degree is designed as an integer, and the engagement stiffness can be kept constant, thereby greatly improving the dynamic engagement performance of the gear pair. In the application, the normal tooth profile of the pair-constructing cylindrical gear I and the pair-constructing cylindrical gear II is the same, the engagement point curvature radius is constant and tends to infinity, the sliding rate is constant, and the engagement stiffness is constant, and the application has the technical characteristics of low manufacturing cost, high bearing capacity, high transmission efficiency, low vibration and noise and the like.

The invention discloses a curve adjustment method and device based on feature control points, equipment, a medium and a product, and relates to the field of computer-aided geometric design, the method comprises the following steps: introducing a shape parameter a, and constructing a planar cubic Bezier curve with the shape parameter; according to design requirements, performing interpolation processing on feature points of the planar cubic Bezier curve, and determining curve segments with the feature points; based on a continuity constraint condition, splicing all curve segments with feature points; initializing adjustment parameters according to the curve type, the feature point type and the interpolation position of the planar cubic Bezier curve; according to the initialized adjustment parameters, control points of the curve segments with the feature points are calculated, and a linear equation set is constructed; the control parameters are optimized according to the linear equation set, the curve shape is adjusted according to the optimized control parameters, curve continuity can be improved, and the type of the insertion point can be controlled.

A method of fabricating an aircraft structural component for an aircraft includes providing a component precursor with a web and a flange. The web has a length, height shorter than the length, thickness shorter than the height, first end proximal to the flange and second end distal from the flange. A force is applied to the component precursor with a magnitude varying along the web height from a minimum at one of the first and second ends to a maximum at another of the first and second ends to increase length of the web to different extents. Then shaping the component precursor includes curving the component precursor into a curved shape having a first radius of curvature at the one of the first and second ends and a second radius of curvature at the another of the first and second ends, the second radius of curvature greater than the first.

The invention provides a blade assembly of a roller of a coal mining machine, the blade assembly comprises a plurality of blades connected end to end, the blades and the blade assembly are in a variable curve shape, the average longitudinal distance of the blades is h / n, the average rotation angle is C / n, the longitudinal distance h of the blade assembly is the vertical distance from the tail of the roller body to the surface of an end disc, and n is the number of the blades, the rotation angle of the blade assembly is the difference value of the first lead angle and the second lead angle of the blade assembly, the third lead angle of the previous blade is the fourth lead angle of the next blade, and the fourth lead angle of each blade is the sum of the third lead angle of each blade and the average deflection angle. And the twisting times of each blade and the number of the blades are in a multiple relationship. According to the sectional type blade assemblies, the shape or size of each blade can be flexibly designed, so that the blade assemblies can better improve the change condition of a coal containing space between the blade assemblies, and better deslagging efficiency is achieved.

The utility model discloses a gear which comprises a gear body and a bearing, the bearing comprises a bearing outer ring, the outer surface of the bearing outer ring is provided with periodically distributed groove textures, the gear body comprises an annular flange, and the inner surface of the annular flange is provided with protruding textures corresponding to the groove textures of the bearing outer ring. The groove textures and the protruding textures are fixedly connected in a clamping mode, the groove textures and the protruding textures are curve-shaped, preferably arc-shaped, and the height of the protruding textures is matched with the depth of the groove textures. The bearing outer ring is made of a Gr15 material, and the hardness of the bearing outer ring reaches HRC 60-63.5 through quenching treatment. Through the clamping design of the concave-convex textures, stable connection of the gear and the bearing is achieved, the assembly process is simplified, and the gear bearing is suitable for high-load and high-precision mechanical equipment.

According to the present invention, it is possible to provide a processing device and a manufacturing method that can suppress the remaining of air bubbles in a workpiece and can suppress the relative positional displacement between an upper mold and a lower mold. This machining device performs press machining on a workpiece, and is provided with: a lower die on which the workpiece is placed; an upper die that pressurizes the workpiece together with the lower die and has a convex curved shape in the pressurizing direction; and a plurality of positioning mechanisms that are respectively provided on the upper die and the lower die and that position the upper die with respect to the lower die, the upper die transitions from a curved shape to a flat shape from a state in which the upper die is in line contact with the workpiece at a position closest to the workpiece as the pressing force increases, and at least one of the positioning mechanisms is provided on an extension line of the contact line.

1. The name of the design product: Goryeolwa faucet. 2. The use of the design product: used for laying on the roof ridge to form the curve shape of the roof ridge end. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: perspective view.

Provided is an internal meshing cylindrical gear pair with a constant meshing characteristics constructed tooth pair. The internal meshing cylindrical gear pair with a constructed tooth pair includes an external cylindrical gear with a constructed tooth pair and an internal cylindrical gear with a constructed tooth pair based on conjugate curves. In the present disclosure, normal tooth profile curves of the external cylindrical gear with a constructed tooth pair and the internal cylindrical gear with a constructed tooth pair are continuous combined curves with the same curve shape, which facilitates machining by the same cutter. A common normal at an inflection point or a tangent point of the continuous combined curve passes through a pitch point of the gear pair, and a position of the inflection point or the tangent point can be adjusted as required, so as to adjust a sliding ratio of the gear pair.

To provide a heel core which enables a user to easily put on shoes and to obtain a fit feeling in a worn state.SOLUTION: The heel core 21 is provided in the heel portion 13 of the shoe 10. The guide portion (32) has a curved shape that is concave forward when viewed from above, the guide portion (32) has a rear guide portion (36) having an inclined shape that extends forward as it goes downward from an upper end 32t of the guide portion (32), and the through hole (26) is provided in the main body portion (31).SELECTED DRAWING: Figure 2

A cutting insert (1), comprising: a first surface (3) having a corner (9) with a convex-curved shape in an outward direction and a first side (11) and a second side (13) extending each from the corner (9), a second surface (5) which is arranged on one of the sides opposite the first surface (3), and a third surface (7) arranged between the first surface (3) and the second surface (5), wherein an imaginary plane that is orthogonal to a central axis (O1) passing through a center point of the first surface (3) and a center point of the second surface (5), and is arranged between the first surface (3) and the second surface (5), is assumed to be the reference plane, the first surface (3) further has an inclined surface (17) which approaches the reference plane with increasing distance from the corner (9), the inclined surface (17) a first inclined surface (19) which is inclined at a first angle (θ1), a second inclined surface (21) which is arranged further away from the corner (9) than the first inclined surface (19) and is inclined at a second angle (θ2), and a third inclined surface (23) which is arranged further away from the corner (9) than the second inclined surface (21) and is inclined at a third angle (θ3), the first inclined surface (19) has a concave-curved shape in a cross-section orthogonal to an angle bisector (L1) of the corner (9), the second inclined surface (21) is a flat surface, and, in a cross-section that includes the angle bisector (L1) of the corner (9) and is orthogonal to the reference plane, the second angle (θ2) is smaller than the first angle (θ1) and the third angle (θ3), wherein in a top view of the first surface (3) a length (L32) of the third inclined surface (23) in a direction orthogonal to the angle bisector (L1) of the corner (9) is greater than a length (L22) of the second inclined surface (21) in the direction orthogonal to the angle bisector (L1) of the corner (9).

This invention discloses an adaptive positioning and clamping device and method for hyperbolic panels. By integrating four basic degrees of freedom of motion—horizontal lateral movement, vertical lifting, horizontal rotation, and vertical pitch—it constructs a complete spatial posture adjustment capability. This enables precise arrival at the spatial coordinates of any preset point on a complex curved surface and adaptive adjustment to a final posture aligned with the surface normal at that point. This solves the problem of conformal clamping caused by continuous changes in the edge position and angle of hyperbolic panels. Through the coordinated operation of these four degrees of freedom, it achieves complete following and dynamic matching of the panel edge curve shape, accurately responding to changes in curvature distribution, and ensuring stable clamping with adaptive posture at any contour position. This breaks through the structural limitations of traditional fixed or limited adjustment clamping methods, providing a highly adaptable and high-precision positioning and clamping solution for the molding of aerospace composite material components with continuously variable curvature characteristics.

The invention provides a curved surface detection system of an ergonomic chair back, and relates to the technical field of irregular surface detection. Comprising a plurality of detection units, an adjusting unit for adjusting the plurality of detection units to a standard state, and a controller, the detection unit comprises a top contact piece used for abutting against the curved surface of the chair back to be detected, and the top contact piece is arranged in a sliding mode in the first direction; the first direction is perpendicular to the chair back to be detected; in a standard state, the top contact part is propped against the curved surface of the standard chair back; the deformation mechanism is arranged at the tail end of the top contact piece and deforms along with the sliding of the top contact piece; the pressure measuring mechanism is used for detecting pressure generated by deformation of the deformation mechanism and uploading the pressure to the controller; and the controller processes the received pressure and judges whether the curved surface of the chair back to be detected is qualified or not. According to the application, the curved surface bending shape of the chair back can be accurately detected, and the technical deficiency in the aspect at present is made up.

1. Name of this design product: Press Pump Head (Nike Function Curve Shape). 2. Purpose of this design: For use as a press pump head for packaging bottles. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

An end mill (1) extending in the axial direction along a center axis (C), the end mill (1) having a blade section (3) on the tip side of the end mill (1), four or more groups of cutting blades (7) being provided on the blade section (3) around the center axis (C), the diameter dimension (D) of the rotational trajectory of the cutting blades (7) around the center axis (C) being 3 mm or less, and the radial inner end of an end blade (71) being disposed at a distance from the center axis (C) in the radial direction. The rotation trajectory of the end cutting edge (71) around the central axis (C) has a curved shape that protrudes toward the tip side in a longitudinal cross-sectional view along the central axis (C), and in the longitudinal cross-sectional view, the curvature radius (R) of a convex curve formed by the rotation trajectory of the end cutting edge (71) is larger than the diameter (D), and the chip removal groove (4) has a groove cut-off section (10). And a groove cut-off section (10) which is positioned at the boundary between the rear end of the chip removal groove (4) and the outer peripheral surface (3b) of the blade section (3) and extends linearly, and the ratio (L / D) of the axial dimension (L) and the diameter dimension (D) between the tip of the end blade (71) and the rear end of the chip removal groove (4) is 2.0 or less.

The drill (10) includes a body (1) extending in an axial direction with a center axis (O) as a center, and the body (1) has a chip discharge groove (4), a rake face, a flank face (6), and a cutting edge (7). The rake face has a first rake face and a second rake face that is disposed radially outward of the first rake face and is connected to an outer peripheral surface 8. The second rake face extends in a direction opposite to a drill rotation direction (T) around the center axis (O) as the second rake face goes toward a radially outer side. The cutting edge (7) includes a first cutting edge (72) extending along a tip edge of the first rake face and a second cutting edge (73) that is connected to a radially outer end portion of the first cutting edge (72) and extends along a tip edge of the second rake face. The second cutting edge (73) has a linear shape or a concave curved shape, and a radial rake angle (θ) of the second cutting edge (73) is a negative angle over an entire length of the second cutting edge (73).

The present invention provides a design method for the edge curve of a fine milling blade. First, the theoretical profile of the workpiece to be machined is obtained, and the involute part of a single tooth profile is evenly divided in a rectangular coordinate system as the original coordinate points for curve fitting. Secondly, the improved moving least squares method (MLS) is used to fit the tooth profile coordinate points to obtain a curve shape that conforms to the involute of the tooth profile, and then it is reflected on the edge curve of the fine milling cutter head. Finally, a comparison is made between it and the edge curve of the tool designed by the traditional method: the approximate circular arc design based on the least squares method during milling, and the tooth profile allowance conditions after machining with the two different tools are obtained to verify the effectiveness of the proposed method. By constructing a new function, the present invention reduces the errors existing in the curve fitting process and applies it to the design of the edge curve of the fine milling blade, making the edge shape of the blade closer to the actual profile of the workpiece, optimizing the blade, and improving the accuracy of gear milling.

Device (1) adapted for internal gripping of an exhaust pipe, comprising: a hand piece (20); a gripping device (100) comprising a pull element (120) and a plurality of substantially rigid segments (111-119) connected in series and moveable relative to each other, wherein one of said segments (111) is connected to the hand piece, and another of said segments (119) is connected to the pull element (120); wherein the plurality of segments is moveable between a substantially straight configuration, in which the segments are substantially aligned along an first axis (A), and a curved configuration, in which the segments are substantially aligned along a curve, wherein the pull element comprises a flexible portion (125) extending though the segments; wherein the hand piece (20) is provided with a manoeuvring device (40) adapted for pulling on the pull element (120) to cause the segments of the gripping device to move relative to each other to the curved configuration in which they form a curved shape for gripping an inner surface of the exhaust pipe and with the flexible portion of the pull element extending in non-linear fashion through the curved shape.

The application discloses a constant engagement characteristic pair-gear-rack pair, and relates to the technical field of gear transmission, comprising a pair-gear rack based on conjugate curves and a pair-gear cylindrical gear. In the application, the normal tooth profile curve of the pair-gear cylindrical gear and the pair-gear rack is a continuous combination curve with the same curve shape, which is convenient for processing with the same cutter; the common normal line at the inflection point or the tangent point of the continuous combination curve passes through the node of the gear rack pair, and the inflection point or the tangent point position can be adjusted according to requirements to adjust the sliding rate of the gear rack pair; the pair-gear rack pair can be designed in a symmetrical form along the tooth width, and the overlap degree is designed as an integer, so that the engagement force action line and the engagement stiffness are constant. In the application, the normal tooth profile of the pair-gear rack and the pair-gear cylindrical gear is the same, the curvature radius of the engagement point is constant and tends to infinity, the sliding rate is constant, the engagement stiffness is constant, and the direction of the engagement force action line is constant, and the application has the technical characteristics of low manufacturing cost, high bearing capacity, high transmission efficiency and low vibration and noise.

To provide a method for manufacturing a columnar body that enables the columnar body to be produced more easily and at lower cost.SOLUTION: The method includes the steps of: calculating the radius of curvature along a generatrix direction with respect to a columnar surface having a desired curved shape; producing a plate-shaped body whose cross-sectional area is determined along the generatrix direction in proportion to the radius of curvature; and bending the plate-shaped body along the generatrix direction. The generatrix may be any differentiable curve, preferably a parabola, an ellipse, or a hyperbola, and may also be a curve having an inflection point.SELECTED DRAWING: Figure 3

The cutting insert includes a rake face (50), a flank face (70), and a cutting edge (10) comprising a ridge line (20) between the rake face and the flank face. A cutting edge is provided with: a first cutting edge part (1) for corner machining; a second cutting blade part (2) for low-cut broaching; a third cutting blade part (3) for high-cut broaching; a fourth cutting blade section (4) for finishing the surface; a first connecting cutting edge portion; a second connecting cutting edge part; and a third connecting cutting edge portion. The fourth cutting edge portion is disposed between the first cutting edge portion and the second cutting edge portion. The second cutting edge portion is disposed between the fourth cutting edge portion and the third cutting edge portion. The first cutting edge portion, the second cutting edge portion, and the fourth cutting edge portion each have a curved shape. The radius of curvature of the first cutting edge portion is 0.1 mm or more and 2.4 mm or less. The radius of curvature of the second cutting edge portion is 3 mm or more. The radius of curvature of the fourth cutting edge portion is 3 mm or more. The third cutting edge portion has a linear shape.

The invention discloses a star-shaped hyperbolic negative Poisson's ratio honeycomb structure based on auxetic metamaterials, which comprises structural shapes, the structural shapes comprise curve shapes and linear shapes, the curve shapes are positioned on the left and right sides of the structural shapes, the linear shapes are positioned on the upper and lower sides of the structural shapes, and main curve spaces are arranged in the curve shapes; a concave hyperbolic curve is arranged between the main curved spaces and located in the middle of the structural appearance, triangular spaces are arranged in the linear appearance and located on the upper side and the lower side of the structural appearance, a rhombic four-curve is arranged in each main curved space, and four auxiliary curved spaces are arranged at the upper position and the lower position of each rhombic four-curve. The auxiliary curved spaces are located on the left side and the right side of the inwards-concave hyperbolic curve. The star-shaped hyperbolic negative Poisson's ratio honeycomb structure based on the auxetic metamaterial has a guiding effect on negative Poisson's ratio structure research and practical application, and is beneficial for designing a most coincident structural form according to specific performance required by practical engineering.