133 results about "Circular section" patented technology

The invention discloses an inverted trapezoidal pile cap and connecting beam combined pile-supported embankment structure and a construction method thereof. The structure sequentially comprises a foundation treatment layer, a rigid pile layer, a pile cap layer, a connecting beam layer, a mattress layer, a reinforcement layer and an embankment filling layer from bottom to top. The rigid pile layer comprises a plurality of cast-in-place piles or precast piles vertically arranged in the foundation. The pile cap layer is arranged at the top of the rigid pile, the pile cap is of an inverted trapezoidal structure with a square section, and the top plane size is larger than the bottom to form a load diffusion slope. The adjacent pile caps are connected through connecting beams with circular sections to form a space overall stress system. Grouting pipelines are reserved in the pile cap and the rigid pile and used for later reinforcement. The load transfer area is enlarged through the inverted trapezoidal pile caps, the horizontal rigidity and the torsion resistance are improved through the circular connecting beams, and the overall stability, the anti-settling performance and the long-term service life of the embankment are remarkably improved by combining the grouting pipelines and the reinforcing ribs.

The present application belongs to the technical field of lightweight structure, and particularly relates to a lightweight structure rod layout and discrete size optimization method. The present application is a lightweight design for a three-dimensional structure, adopts point coordinates in a space coordinate system and the number of selected rods to determine the layout form of the three-dimensional structure, the rods are rods with circular cross sections, and then an improved double-value coding parameterization method (referred to as BCP method) is used to determine the diameter size of the selected rods, thereby forming a lightweight structure layout and discrete size optimization design method, so as to facilitate the extraction of geometric parameters of the optimization result, and also facilitate the selection of rods with common regular diameter sizes. The present application avoids the problems of cross overlap between rods, and can provide more design schemes for the optimal rod layout of similar truss structures.

The roughly circular section on the handle is a button that is operated by sliding it back and forth to adjust the water flow of the shower.

The utility model discloses a high-low plate semitrailer capable of longitudinally transporting cargoes with circular sections, which comprises a gooseneck type main frame, a front fixed platform arranged on the upper portion of the front end of the gooseneck type main frame and a rear fixed platform arranged on the upper portion of the rear end of the gooseneck type main frame, and a plurality of movable bottom plates are arranged on the upper portion of the rear fixed platform. Each movable bottom plate comprises a middle bottom plate and two foldable side bottom plates symmetrically arranged on the left side and the right side of the middle bottom plate, each movable bottom plate has two states, in the first state, the movable bottom plate and the rear fixed platform are in a horizontal attaching state, and in the second state, the movable bottom plate and the rear fixed platform are in a horizontal attaching state. And an included angle is formed between the movable bottom plate and the rear fixed platform. The semi-trailer has the advantages that the semi-trailer has various forms, can be used as a high-low plate semi-trailer, and can also be used as a goods transportation semi-trailer with a circular section; compared with a common high-low plate semi-trailer, the medium transported by the semi-trailer is more diversified.

This article is a packaging container formed by molding a sheet-like blank shown in the reference development diagram using a press. The blank shown in the reference development diagram is folded in mountain folds indicated by the dashed lines and in valley folds indicated by the two-dot chain lines. The blank is pressed and heated during molding, melting the synthetic resin coating layer on the surface of the blank, crimping the blank, and maintaining its shape as a packaging container. After the outer edge of the blank is hemmed to a generally circular cross section, the outer edge is pressurized from above and below to form a hemmed portion with a generally elliptical cross section and flat portions on the top and bottom surfaces at the edge of the container, thereby improving overall strength and stably maintaining the shape of the container. When a lid sheet material for sealing this article is adhered to the hemmed portion, the flat portions on the top surface of the hemmed portion improve adhesion. The hemmed portion with a generally elliptical cross section improves strength in the direction parallel to the horizontal direction (lateral direction), making it suitable for wrap packaging.

The invention belongs to the technical field of wire harness processing, and discloses an automobile wire harness cutting mechanism which comprises a guide piece and a clamping piece which are located at the end of a wire harness. The guide element is provided with a guide slope surface extending towards the radial outer side of the wire harness, and the guide slope surface is inserted into and acts on an interface between the braid layer and the insulating layer; an active deformation strategy of internal pressure and external expansion is adopted: a clamping and pressing piece acts on the inner side of the end part of the wire harness, and uniform pressure is applied to the center along the radial direction, so that an original circular section generates controllable local elliptical or flattened deformation. Due to basic conservation of the material volume, the inner side compression inevitably causes outward slight expansion of the outer side area, so that a continuous, annular and width-adjustable initial gap is formed at the interface of the braid layer and the insulating layer. The gap is not dependent on material relaxation, but is actively generated by mechanical force, and has high repeatability and process stability. The guide piece is smoothly wedged in through the gap, and structural damage caused by impact type insertion is avoided.

A delivery pen includes a reservoir including a non-circular shape, a plunger positioned in the reservoir, and a screw mechanism at least partially inserted within the reservoir. The screw mechanism includes a drive shaft including one or more protruding member at a proximal end and an elongated member extending longitudinally from the proximal end, an inner screw concentrically engaging the elongated member, an outer housing including a circular section rotatably engaging the one or more protruding member and a non-circular section sized to fit within the reservoir, and a pusher disposed between the inner screw and the outer housing to linearly translate the plunger so as to dispense a medication from the reservoir.

Voltage wave gears in pot or hat design with a. a circular spline (1) whose circular spline toothing (2) has a number of teeth Cz of 100 < Cz < 104, in particular Cz = 102 teeth, b. a flexspline (3) whose flexspline toothing (4) has a number of teeth Fz of Fz = Cz-2 and a pitch circle diameter TDFS and engages in the circular spline toothing (2) at two opposite points and whose wall (5) in its basic form is circular in cross-section and has a flexspline inner diameter IDFS, and with c. a shaft generator (6) having a radially flexible rolling bearing (7) by means of which an oval shaft generator insert (8) is rotatably mounted, characterized in that d. for the pitch circle diameter TDFS: 63.0 mm < TDFS < 64.0 mm, in particular 63.5 mm, and / or that for the flex spline inner diameter IDFS: 60.8 mm < IDFS < 61.8 mm, in particular IDFS = 61.3 mm, and that e. for the axial length LFS of the wall (5) of the flexspline (3) the following applies: LFS < IDFS / 3.00, in particular LFS < IDFS / 3.17 or LFS < IDFS / 3.73, and that i. the oval shape of the wave generator insert (8) in polar coordinates (φ, R(φ)) satisfies the following conditions: - For all φ ∈ {kπ | k ∈ ℤ}, Hmin < |R(φ)| < Hmax, where Hmin = 23.124 mm and Hmax = 23.132 mm, and - For all φ ∈ {π / 4 + kπ / 2 | k ∈ ℤ}, |R(φ)| > c, where c = 22.627 mm, and - For all φ ∈ {π / 2 + k·π | k ∈ ℤ}, the following holds: |R(φ)| < d, where d = 22.03 mm, and / or ii. that the radially flexible rolling bearing (7) has a cross-sectional height Sh in the direction φ=0 and a cross-sectional height Sn in the direction φ-π / 2 and that the oval shape of the radially flexible rolling bearing (7) in polar coordinates (φ, R(φ)) satisfies the following conditions: - For all φ ∈ {kπ | k ∈ ℤ}, Hmin + Sh < |R(φ)| < Hmax + Sh, where Hmin = 23.124 mm and Hmax = 23.132 mm, and - For all φ ∈ {π / 4 + kπ / 2 | k ∈ ℤ}, |R(φ)| > c+(Sh+Sn) / 3, in particular |R(φ)| > c+(Sh+Sn) / 2.6 or |R(cp)| > c+(Sh+Sn) / 2.3, where c = 22.627 mm, and - For all φ = {π / 2 + k·π | k ∈ ℤ}, |R(φ)| < d+Sn, where d = 22.03 mm.

The invention relates to the technical field of shear model boxes, and discloses a novel layered shear model box capable of simulating multi-directional vibration. Comprising a circular base, an outer stand column is fixedly connected to the upper surface of the circular base, a first spring is fixedly connected to the side surface of the outer stand column, and an inner annular steel sheet is fixedly connected to the end, away from the outer stand column, of the first spring. Through horizontal movement of the outward-extending steel rod, the outward-extending steel rod can drive the parallel stabilizing wheel to move horizontally, the parallel stabilizing wheel can roll on the surface of the external horizontal supporting rod, the stability of the outward-extending steel rod when the outward-extending steel rod drives the internal annular steel sheet to move horizontally can be improved, and the direct friction force between the outward-extending steel rod and the internal annular steel sheet is small; and the horizontal supporting rods on the external stable frame can play a role in restraining the outwards-extending steel rods, and it is guaranteed that the internal annular steel sheets only conduct shearing deformation in the horizontal direction.

According to the plastic protective shell for the air spring, the taper guide face and the arc transition face are arranged at the inlet of the annular assembly groove of the protective shell body so as to disperse stress and prevent cracking; the groove adopts a non-circular section and is provided with a one-way anti-retreating structure, so that bidirectional mechanical locking is realized, and loosening is prevented; targeted annular reinforcing ribs are arranged in the areas, corresponding to the grooves, of the shell so as to enhance fatigue resistance. The elastic characteristic of plastic is converted into the assembly advantage, the reliable connection problem of the plastic protective shell is systematically solved, the lightweight advantage of the plastic protective shell is practical, and meanwhile the assembly process is simple and efficient.

The present invention provides a support base structure that enables the maintenance of a facility in its correct position by generating rotational resistance even when rotational force is applied to the support due to wind pressure acting on the facility suspended from the support. According to a suitable embodiment of the present invention, the support base structure comprises a foundation block made of precast concrete, a support with its lower end inserted into the foundation block to a certain depth, and a fixing clamp that is fastened to an anchor bolt embedded in the foundation block and exerts a clamping force on the support. In this structure, a plurality of fixing keys for preventing rotation of the support are installed in a circular arrangement at the lower end of the support, and a support coupling hole is formed in the foundation block, which has a circular cross-section larger than the cross-section of the lower end of the support and is recessed to a certain depth from the upper surface, so that the lower end of the support is inserted to a certain depth, wherein a plurality of mortar-filling grooves for key coupling are formed in a circular arrangement with a certain depth on the inner surface of the support coupling hole. The above-mentioned support is characterized by the fact that a filling material is injected around the lower portion of the support and filled into a mortar filling groove for key coupling, and at the same time, a fixing key coupling groove is formed between the lower portion of the support and the inner surface of the support coupling hole to be coupled with a fixing key for preventing rotation of the support, and a cylindrical ring for preventing rotation is formed to have a filling groove coupling key filled in the mortar filling groove for key coupling.

The application relates to an aerodynamic profile suitable for a wind tunnel and a design method thereof, and belongs to the technical field of aviation aerodynamic wind tunnel tests. The front end surface of the aerodynamic profile is a square section, the rear end surface of the aerodynamic profile is a circular section, the middle part of the aerodynamic profile is a transition section, and the front and rear sections are connected through the change of the section shape from front to back. The research and development purpose is to provide a novel aerodynamic profile design method for the transition from a square section to a circular section, the flow field can be smoothly transitioned from a square to a circle, the influence on the flow field quality is minimized, the pressure loss is reduced, and the method of rounding the right angle and gradually increasing the rounding radius is adopted to realize the smooth transition from the square section to the circular section. The circular arc curve is gradually lengthened, the right angle side is gradually shortened, and finally the profile line is completely changed into a circular shape. The transition mode is natural and smooth, the change is gentle, the aerodynamic performance is good, and the interference on the flow field due to the change of the section shape can be obviously reduced.

The utility model belongs to the technical field of cleaning machine, especially relate to the cleaning machine inner bag structure, be located in the shell of cleaning machine, including the cavity of top opening, cavity top end is equipped with the annular step position of outward extension, the bottom of step position is equipped with the installation component of downward extension, and installation component and the annular support component cooperation of shell top, the cavity has the gradually changing cross -section structure of big down small, and the upper part is square section and gradually changes into circular section downward, the cavity lateral wall below is equipped with the air inlet, and the cavity bottom forms the arc flow guide portion of downward concave, and the flow guide portion is equipped with high -level water inlet and low -level drain, when the airflow flows into the cavity from the air inlet, the cavity bottom forms the airflow channel of low resistance, and the vortex is formed to the airflow rotation movement, makes air along the inner wall spiral ascending, prolongs the airflow path, improves the drying efficiency to the inner bag and the article in the cavity. The gradually changing cross -section structure design of big down small, reduces stress concentration, promotes the overall strength of inner bag structure, strengthens the compression resistance.

Stress wave gear in pot or hat design with a. a circular spline (1) whose circular spline toothing (2) has a number of teeth Cz of 100 < Cz < 104, in particular Cz = 102 teeth, b. a flexspline (3) whose flexspline toothing (4) has a number of teeth Fz of Fz = Cz-2 and a pitch circle diameter TDFS and engages in the circular spline toothing (2) at two opposite points and whose wall (5) in its basic form is circular in cross-section and has a flexspline inner diameter IDFS, and with c. a shaft generator (6) having a radially flexible rolling bearing (7) by means of which an oval shaft generator insert (8) is rotatably mounted, characterized in that d. for the pitch circle diameter TDFS: 34.4 mm < TDFS < 35.4 mm, in particular 34.9 mm, and / or that for the flex spline inner diameter IDFS: 33.4 mm < IDFS < 34.4 mm, in particular IDFS = 33.9 mm, and that e. for the axial length LFS of the wall (5) of the flexspline (3) the following applies: LFS < IDFS / 2.05, in particular LFS < IDFS / 2.16 or LFS < IDFS / 3.35, and that i. the oval shape of the wave generator insert (8) in polar coordinates (φ, R(φ)) satisfies the following conditions: - For all φ ∈ {kπ | k ∈ ℤ}, Hmin < | R(φ) | < Hmax, where Hmin = 12.830 mm and Hmax = 12.838 mm, and - For all φ ∈ {π / 4 + kπ / 2 | k ∈ ℤ}, the following holds: | R(φ) | > c, where c = 12.549 mm, and - For all φ ∈ {π / 2 + k·π | k ∈ ℤ}, the following holds: | R(φ) | < d, where d = 12.22 mm, and / or ii. that the radially flexible rolling bearing (7) has a cross-sectional height Sh in the direction φ=0 and a cross-sectional height Sn in the direction φ=π / 2 and that the oval shape of the radially flexible rolling bearing (7) in polar coordinates (φ, R(φ)) satisfies the following conditions: - For all φ ∈ {kπ | k ∈ ℤ}, Hmin + Sh < | R(φ) | < Hmax + Sh, where Hmin = 12.830 mm and Hmax = 12.838 mm, and - For all φ ∈ {π / 4 + kπ / 2 | k E ℤ}, | R(φ) | > c+(Sh+Sn) / 3, in particular | R(φ) | > c+(Sh+Sn) / 2.6 or | R(φ) | > c+(Sh+Sn) / 2.3, where c = 12.549 mm, and - For all φ ∈ {π / 2 + k·π | k ∈ ℤ}, the following holds: | R(φ) | < d+Sn, where d = 12.22 mm.

This application provides a process, apparatus, and design method for roll forming of non-circular cross-section irregular shells. The design method includes the following steps: A1, designing the three-dimensional shape of the punch based on the three-dimensional shape of the inner wall of the non-circular cross-section irregular shell; A2, determining the number of a set of cooperating forging rolls based on the three-dimensional shape of the outer wall of the non-circular cross-section irregular shell, wherein the number of forging rolls is greater than or equal to 2, and the axes of all forging rolls are coplanar; A3, designing the shape of the loading surface of each forging roll based on the three-dimensional shape of the outer wall of the non-circular cross-section irregular shell, wherein the intersection line of the loading surface and the contact plane constitutes the outer perimeter of the die orifice of the irregular shell forming apparatus, the intersection line of the outer wall of the punch and the contact plane constitutes the inner perimeter of the die orifice, and the contact plane is the plane formed by the intersection of the axes of all forging rolls. The technical solution of this application can effectively improve the roll forming quality of non-circular cross-section irregular shells.

A shoulder prosthesis baseplate (100) comprising a through-hole (102) for a compressive screw (101), wherein the through-hole (102) has a circular profile section and comprises a projecting edge (106) arranged internally and perpendicularly to an axis (102j of the through-hole (102), the projecting edge (106) being configured to axially retain a head (103) of the compressive screw (101) inserted in the through-hole (102). The projecting edge (106) has circular are shape and delimits a corresponding free portion (108) of the circular profile section internally to the through-hole (102), the free portion (108) being configured to allow the screwing passage of a threaded stem (104) of the compressive screw (101) to surpass the projecting edge (106).

The invention relates to a thermoplastic composite comprising:at least one straight portion having a circular section with an external diameter, and a longitudinal axis,at least one bent portion,at least one bending radius, of the at least one bent portion the bending radius being at most a factor f equal to 5 with respect to the external diameter of the at least one straight portion, anda thermoplastic matrix and a fiber reinforcement.The invention also relates to a structure to be reinforced comprising at least one thermoplastic, uses of a thermoplastic composite and a method for producing a thermoplastic composite.

The utility model relates to a tunnel boring machine with an adjustable section, and belongs to the technical field of tunnel boring machines. The section-adjustable cutter head comprises a telescopic inner beam and a cutting tool, and the excavation section is adjusted through hydraulic driving; the section-adjustable shield body is provided with an external variable-section shield shell, and the section shape is adjusted through a telescopic oil cylinder. And the central rotary joint is matched with the main drive to drive the cutterhead to rotate and control the cutting direction. The telescopic inner beam is hydraulically driven to stretch out and draw back, the shape of an excavation section is adjusted, the telescopic oil cylinder adjusts the shape of an external variable-section shield shell, conversion of a circular section, a rectangular section or a combined section is achieved, and meanwhile continuous deformation of the shield shell is achieved by synchronously controlling the stretching amount of the telescopic oil cylinder. The heading machine can complete adjustment of various sections in the shutdown state of the tunnel, the requirements of different tunnels are met, and the heading efficiency and flexibility are improved.

The invention belongs to the technical field of pipe fitting inner wall polishing, and particularly relates to an inner wall polishing device for hardware pipe fitting machining, which comprises a mounting frame, two guide rails, a movable frame, a connecting frame, a control module, a fixed frame, a sliding frame, an electric cylinder and the like, the two guide rails are symmetrically mounted on the mounting frame, and the movable frame is slidably arranged between the two guide rails; a control module is installed on the lower portion of the connecting frame, a fixed frame is installed on the left side of the upper portion of the connecting frame, a sliding frame is fixedly arranged on the right side of the movable frame, and an electric cylinder is installed on the mounting frame. The electric cylinder drives the limiting frame to ascend and descend, the height position of the polishing rod can be accurately adjusted, it is ensured that the axis of the polishing rod is aligned with the centers of inner holes of pipe fittings with different diameters, and the polishing rods with different inner diameters can be rapidly replaced under the condition that other parts are not disassembled by combining sliding sleeving connection of the polishing rod and the prismatic rod and a non-circular section transmission structure; and the universality, the remodeling efficiency and the operation convenience of the equipment are obviously improved.

The invention discloses a reinforcement-solid waste concrete bonding strength prediction method based on an improved failure criterion, and belongs to the field of reinforcement-solid waste concrete mechanical modeling. The method comprises the steps that a simplified circular section is divided into a plastic area and an elastic area, and the two areas and a radial stress calculation equation provided by the passive constraint component are determined respectively; putting forward an extended Mohr-Coulomb criterion, and defining yield lines of an interface shearing behavior and a sliding behavior under a sufficient constraint condition; introducing a crack expansion factor to correct the strength of the solid waste concrete, and searching a to-be-optimized parameter value through a particle swarm optimization algorithm; and embedding the existing physical model into the residual error network loss function item to construct a residual error network model. The method can quantitatively describe the evolution law of the bonding strength of the reinforcing steel bar-solid waste concrete interface under different material and structure parameters, is high in prediction precision and strong in extrapolation capability, and is suitable for anchoring design and mechanical property evaluation of a reinforcing steel bar-solid waste concrete structure.

Seals for medical fluid connectors are disclosed. A seal as molded may have an elliptical cross-sectional shape, an aperture on the top face of the seal, a well inside the seal, and a divet on the bottom face of the seal. The seal as molded becomes assembled when it is constrained by a housing. When constrained by the housing, the seal has a circular cross-sectional shape, and the aperture becomes an elongate insertion area. The elongate insertion area is closed such that fluid cannot permeate the seal as assembled. However, the seal as assembled is penetrable by a center post through the elongate insertion area, and the center post creates a fluid path through the seal when the center post penetrates the seal.

Voltage wave gears in pot or hat design with a. a circular spline (1) whose circular spline toothing (2) has a number of teeth Cz of 200 < Cz < 204, in particular Cz = 202 teeth, b. a flexspline (3) whose flexspline toothing (4) has a number of teeth Fz of Fz = Cz-2 and a pitch circle diameter TDFS and engages in the circular spline toothing (2) at two opposite points and whose wall (5) in its basic form is circular in cross-section and has a flexspline inner diameter IDFS, and with c. a shaft generator (6) having a radially flexible rolling bearing (7) by means of which an oval shaft generator insert (8) is rotatably mounted, characterized in that d. for the pitch circle diameter TDFS: 42.6 mm < TDFS < 43.6 mm, in particular 43.1 mm, and / or that for the flex spline inner diameter IDFS: 41.2 mm < IDFS < 42.2 mm, in particular IDFS = 41.7 mm, and that e. for the axial length LFS of the wall (5) of the flexspline (3) the following applies: LFS < IDFS / 2.47, in particular LFS < IDFS / 2.61 or LFS < IDFS / 3.54, and that i. the oval shape of the wave generator insert (8) in polar coordinates (φ, R(φ)) satisfies the following conditions: - For all φ ∈ {kπ | k ∈ ℤ}, Hmin < | R(φ) | < Hmax, where Hmin = 15.398 mm and Hmax = 15.406 mm, and - For all φ ∈ {π / 4 + kπ / 2 | k ∈ ℤ}, the following holds: | R(φ) | > c, where c = 15.159 mm, and - For all φ ∈ {π / 2 + k·π | k ∈ ℤ}, the following holds: | R(φ) | < d, where d = 14.90 mm, and / or ii. that the radially flexible rolling bearing (7) has a cross-sectional height Sh in the direction φ=0 and a cross-sectional height Sn in the direction φ=π / 2 and that the oval shape of the radially flexible rolling bearing (7) in polar coordinates (φ, R(φ)) satisfies the following conditions: - For all φ ∈ {kπ | k ∈ ℤ}, Hmin + Sh < | R(φ) | < Hmax + Sh, where Hmin = 15.398 mm and Hmax = 15.406 mm, and - For all φ ∈ {π / 4 + kπ / 2 | k ∈ ℤ}, | R(φ) | > c+(Sh+Sn) / 3, in particular | R(φ) | > c+(Sh+Sn) / 2.6 or | R(φ) | > c+(Sh+Sn) / 2.3, where c = 15.159 mm, and - For all φ ∈ {π / 2 + k·π | k ∈ ℤ}, the following holds: | R(φ) | < d+Sn, where d = 14.90 mm.

The utility model relates to the technical field of gas lasers, in particular to a folding tube reflecting seat, an adjustable reflecting mirror seat system and a multi-folding laser. According to the utility model, the annular boss is arranged at the beveled elliptical interface, the inner side via hole is arranged to have a circular cross section, and the top edge of the via hole is arranged to have an inward concave cambered surface along the annular direction, so that the annular boss and a reflector seat are assembled and installed; an interface matched with the reflector seat is changed from an ellipse to a perfect circle, and is processed on a circular outline, so that compared with the ellipse, the processing difficulty of the interface is reduced, the processing of the top cambered surface of the interface is more convenient, the contact gap between the circular cambered surface and the reflector seat is more uniform, and the sealing performance is better; the concave cambered surface arranged on the annular boss can form a two-dimensional angle-adjustable structure with the plane fitting edge of the existing reflector seat, and can also form a three-dimensional angle-adjustable structure with the spherical fitting edge of the existing reflector seat, so that the debugging is convenient, the grinding amount is small, and the debugging efficiency is favorably improved.

This invention belongs to the field of pipeline inspection technology, specifically relating to a pipeline inner diameter measurement system and method based on stepping rotation scanning. A drive module drives a ranging sensor to rotate stepwise around a motor axis within a circular cross-section pipeline. A control module collects the radial distance from the sensor to the pipe wall at preset angular intervals, obtaining N sets of angle-distance data covering the entire circumference of the pipeline's inner wall, and converts these into a set of Cartesian coordinate points. After randomly sampling and iteratively removing abnormal coordinate points, ellipse fitting is performed to extract the length of the minor semi-axis of the ellipse. When the fitting result is an ellipse, twice the minor semi-axis is taken as the pipeline inner diameter; when the fitting result meets the circularity criteria, the diameter of the fitted circle is taken as the pipeline inner diameter. This invention is based on the geometric principle that the minor semi-axis of an ellipse with an oblique cylindrical cross-section is always equal to the radius of the cylinder. It eliminates the need to place the device at the center of the pipeline or calibrate the parallelism of the sensor axis; accurate measurement can be achieved regardless of the device's placement.

The present disclosure relates to the technical field of aircraft, and discloses a shock-absorbing device, a gimbal, and an unmanned aerial vehicle, including a first fixing plate; second fixing plates disposed on one side of the first fixing plate at intervals; and a first shock-absorbing mechanism including a first elastic member connected between the first fixing plate and the second fixing plate. The first elastic member has a hollow structure, the first elastic member has a circular cross-section in a direction parallel to the first fixing plate, the first elastic member includes a first installing portion, a second installing portion, and a first buffering portion connected between the first installing portion and the second installing portion, the first installing portion is fixed to the first fixing plate, and the second installing portion is fixed to the second fixing plate.

Voltage wave gears in pot or hat design with a. a circular spline (1) whose circular spline toothing (2) has a number of teeth Cz of 100 < Cz < 104, in particular Cz = 102 teeth, b. a flexspline (3) whose flexspline toothing (4) has a number of teeth Fz of Fz = Cz-2 and a pitch circle diameter TDFS and engages in the circular spline toothing (2) at two opposite points and whose wall (5) in its basic form is circular in cross-section and has a flexspline inner diameter IDFS, and with c. a shaft generator (6) having a radially flexible rolling bearing (7) by means of which an oval shaft generator insert (8) is rotatably mounted, characterized in that d. for the pitch circle diameter TDFS: 50.3 mm < TDFS < 51.3 mm, in particular 50.8 mm, and / or that for the flex spline inner diameter IDFS: 48.6 mm < IDFS < 49.6 mm, in particular IDFS = 49.1 mm, and that e. for the axial length LFS of the wall (5) of the flexspline (3) the following applies: LFS < IDFS / 2.81, in particular LFS < IDFS / 2.97 or LFS < IDFS / 3.74, and that i. the oval shape of the wave generator insert (8) in polar coordinates (φ, R(φ)) satisfies the following conditions: - For all φ ∈ {kπ | k ∈ ℤ}, Hmin < | R(φ) | < Hmax, where Hmin = 18.205 mm and Hmax = 18.213 mm, and - For all φ ∈ {π / 4 + kπ / 2 | k ∈ ℤ}, the following holds: | R(φ) | > c, where c = 17.802 mm, and - For all φ ∈ {π / 2 + k·π | k E ℤ}, the following holds: | R(φ) | < d, where d = 17.32 mm, and / or ii. that the radially flexible rolling bearing (7) has a cross-sectional height Sh in the direction φ=0 and a cross-sectional height Sn in the direction φ=π / 2 and that the oval shape of the radially flexible rolling bearing (7) in polar coordinates (φ, R(φ)) satisfies the following conditions: - For all φ ∈ {kπ | k ∈ ℤ}, Hmin + Sh < | R(φ) | < Hmax + Sh, where Hmin = 18.205 mm and Hmax = 18.213 mm, and - For all φ ∈ {π / 4 + kπ / 2 | k ∈ ℤ}, | R(φ) | > c+(Sh+Sn) / 3, in particular | R(φ) | > c+(Sh+Sn) / 2.6 or | R(φ) | > c+(Sh+Sn) / 2.3, where c = 17.802 mm, and - For all φ ∈ {π / 2 + k·π | k ∈ ℤ}, the following holds: | R(φ) | < d+Sn, where d = 17.32 mm.

The invention relates to the technical field of steel cord production, in particular to a flat structure steel cord production defect detection device which comprises a feeding detection assembly, a flattening assembly and a discharging detection assembly which are sequentially arranged in the steel wire running direction. The steel wire has a circular section before entering the flat assembly, and forms a flat rectangular section after being extruded by the flat assembly. The feeding detection assembly is used for detecting and blocking the steel wire with the non-circular section, the discharging detection assembly is used for detecting and blocking the steel wire with the non-rectangular section, and therefore shape recognition of the steel wire before and after flattening machining is achieved. The flat assembly is composed of an installation shell, a flat wheel set and an adjusting rod, rolling wheels are arranged in an up-down staggered mode, and the adjusting rod is used for adjusting the extrusion gap. Real-time judgment of the section state of the steel wire is achieved through the front and back double detection structures, abnormal steel wires are prevented from flowing into or out of the flattening process, and the production stability and the finished product quality of the flat structure steel cord are improved.

Voltage wave gears in pot or hat design with a. a circular spline (1) whose circular spline toothing (2) has a number of teeth Cz of 100 < Cz < 104, in particular Cz = 102 teeth, b. a flexspline (3) whose flexspline toothing (4) has a number of teeth Fz of Fz = Cz-2 and a pitch circle diameter TDFS and engages in the circular spline toothing (2) at two opposite points and whose wall (5) in its basic form is circular in cross-section and has a flexspline inner diameter IDFS, and with c. a shaft generator (6) having a radially flexible rolling bearing (7) by means of which an oval shaft generator insert (8) is rotatably mounted, characterized in that d. for the pitch circle diameter TDFS: 42.6 mm < TDFS < 43.6 mm, in particular 43.1 mm, and / or that for the flex spline inner diameter IDFS: 41.2 mm < IDFS < 42.2 mm, in particular IDFS = 41.7 mm, and that e. for the axial length LFS of the wall (5) of the flexspline (3) the following applies: LFS < IDFS / 2.47, in particular LFS < IDFS / 2.61 or LFS < IDFS / 3.54, and that i. the oval shape of the wave generator insert (8) in polar coordinates (φ, R(φ)) satisfies the following conditions: - For all φ ∈ {kπ | k ∈ ℤ}, Hmin < | R(φ) | < Hmax, where Hmin = 15.503 mm and Hmax = 15.511 mm, and - For all φ ∈ {π / 4 + kπ / 2 | k ∈ ℤ}, the following holds: | R(φ) | > c, where c = 15.164 mm, and - For all φ ∈ {π / 2 + k·π | k ∈ ℤ}, the following holds: | R(φ) | < d, where d = 14.76 mm, and / or ii. that the radially flexible rolling bearing (7) has a cross-sectional height Sh in the direction φ=0 and a cross-sectional height Sn in the direction φ=π / 2 and that the oval shape of the radially flexible rolling bearing (7) in polar coordinates (φ, R(φ)) satisfies the following conditions: - For all φ ∈ {kπ | k ∈ ℤ}, Hmin + Sh < | R(φ) | < Hmax + Sh, where Hmin = 15.503 mm and Hmax = 15.511 mm, and - For all φ ∈ {π / 4 + kπ / 2 | k ∈ ℤ}, | R(φ) | > c+(Sh+Sn) / 3, in particular | R(φ) | > c+(Sh+Sn) / 2.6 or | R(φ) | > c+(Sh+Sn) / 2.3, where c = 15.164 mm, and - For all φ ∈ {π / 2 + k·π | k ∈ ℤ}, the following holds: | R(φ) | < d+Sn, where d = 14.76 mm.

The utility model provides a ball bearing support capable of avoiding machining cracking and a transmission shaft supporting structure, and relates to the technical field of ball bearing supports, the ball bearing support capable of avoiding machining cracking comprises a support cover plate and a support base, the support cover plate and the support base are both provided with bearing installation parts, and the bearing installation parts are provided with bearing holes. At least one of the bearing installation parts of the support cover plate and the support base is provided with a non-circular section part, the outer edge of the non-circular section part is provided with a concave-convex structure, and the stamping outlines of the support cover plate and the support base are arranged to be non-circular sections such as incomplete circular sections, so that a material port can be prevented from cracking due to instant impact, and the service life of the material port is prolonged. And moreover, the non-circular section part reduces the ductility requirement of the material, so that the purchasing convenience and the economical efficiency are better.

To provide a hanging tool and storage facility that has good design and is easy to install. [Solution] The groove insertion portion 4 has a first protruding piece 41 and a second protruding piece 42 that protrude from the connection portion 5, and the first protruding piece 41 and the second protruding piece 42 are arranged at a distance from each other and are each elastically deformable, and when the distance between the first protruding piece 41 and the second protruding piece 42 inside the groove portion 23 becomes large, the fixing portion 6 is attached to the groove portion 23 and has a rotating shaft portion 61 that is arranged at the distance between the first protruding piece 41 and the second protruding piece 42 and is rotatable around an axis, and the rotating shaft portion 61 has a cylindrical portion 611 with a circular cross-sectional shape perpendicular to the axial direction, and a protrusion portion 612 that protrudes radially outward from the outer peripheral surface of the cylindrical portion 611, and is switchable between a fixed position in which the protrusion portion 612 comes into contact with the first protruding piece 41 to widen the distance between the first protruding piece 41 and the second protruding piece 42 and a released position in which the distance between the first protruding piece 41 and the second protruding piece 42 is not widened by rotating around the axis.