40 results about "Elliptical cylinder" patented technology

The invention discloses a component-level digital twin railway tunnel engineering three-dimensional model three-dimensional tile conversion method, which comprises the following steps: opening a tunnel BIM model file, and obtaining external setting parameters, artificial constraint parameters and model information to generate triangular mesh model data; establishing an association relationship between the semantic attribute information and the triangular mesh model, and mapping one by one to obtain LOD4 hierarchical model data; screening and cleaning the semantics, and removing a specified component to obtain LLO3 hierarchical model data; obtaining a maximum outer bounding box fitting elliptic cylinder of the tunnel model, and performing similar block replacement to obtain LOD2 hierarchical model data; the method comprises the following steps: traversing sprayed concrete members according to a line trend sequence to obtain coordinates of geometric center points of bounding boxes of the sprayed concrete members, and forming an ordered point set fitting line as an LOD1 hierarchical model; performing format conversion on the LOD models of different hierarchies, and finally organizing the LOD models into a tree structure to form three-dimensional tile structure data; the method is simple and high in execution efficiency.

The utility model relates to the technical field of spray pipe machining, and discloses a clamping tool for spray pipe machining, which comprises a fixed seat, a limiting sliding groove is arranged on the fixed seat, a two-way screw is arranged in the limiting sliding groove, a motor is arranged on one side of the fixed seat, a sliding block is sleeved on the two-way screw, a support ring is arranged on the front side of the sliding block, and the two-way screw is sleeved on the support ring. An annular clamping groove is formed in the inner side of the supporting ring, and a movable ring is rotationally clamped in the annular clamping groove. Due to the fact that the movable ring is rotationally connected with the supporting ring in a clamped mode, the movable ring can be driven to rotate by shifting a hydraulic rod, the machining angle of the spray pipe is rotationally adjusted, then a pressing rod is pressed downwards to make the end, with the long inner diameter, of an elliptic cylinder make extrusion contact with one side of the movable ring, and the elliptic cylinder conducts extrusion positioning on the movable ring; the spraying pipe is prevented from rotating when being machined, and when the angle of the spraying pipe is adjusted, the pressing rod is lifted up, so that the end, with the long inner diameter, of the elliptic cylinder is far away from the movable ring to be extruded, and therefore the movable ring can recover to rotate.

This invention discloses an ellipticity standard component and measurement method for measuring the quality of duct bending deformation. The standard component includes several grooves cut from top to bottom on the surface of a cylindrical body. The cross-sections at the groove locations are elliptical, and the ellipticity of each elliptical cross-section is unequal. Each elliptical cross-section and the groove wall along the central axis constitute several elliptical cylinder standard components. A coordinate measuring machine (CMM) is used to calibrate the standard component: First, coordinate points are collected on the outer cylindrical surface of the standard component, and the central axis is fitted to obtain it. Then, coordinate points are collected on the elliptical cylinder surface of the standard component and projected onto a plane with the central axis as the normal vector, and the geometric parameters of the elliptical cylinder are fitted to obtain it. Finally, the ellipticity corresponding to each elliptical cylinder is calculated, completing the fabrication of the ellipticity standard component. This invention establishes a standard for the detection and evaluation of ellipticity after duct bending deformation and proposes a method for measuring ellipticity using a coordinate measuring machine, which has good versatility and high accuracy.

The invention relates to the technical field of semiconductor lasers, in particular to a metasurface element, a laser and a preparation method. The metasurface element comprises a first column body and a second column body, and the first column body and the second column body are sequentially arranged from bottom to top; the first column body is an elliptic column, and the second column body is a circular column; in addition, the first column body and the second column body have biaxial anisotropy, namely, the polarization state of light is regulated and controlled through the anisotropy. According to the embodiment of the invention, different structural designs of the upper layer and the lower layer of the metasurface element are utilized, that is, the metasurface element can be used for biaxial anisotropy and regulation and control of the polarization state of light, so that radial and angular high-order modes of output light of the laser are effectively inhibited, high-order transverse modes are reduced, the signal-to-noise ratio is improved, and finally the quality of the output light is improved.

The utility model discloses a tester capable of automatically adjusting optical density and concentration, the overall appearance of the tester is in an elliptic cylinder shape, the tester is provided with a main body shell and an inner wall, the main body shell, an internal first-layer space and an internal second-layer space are sequentially arranged at the upper part from outside to inside, the internal first-layer space is arranged between the main body shell and the inner wall, and the internal second-layer space is arranged between the main body shell and the inner wall. The interior of the inner wall is an internal second-layer space; a central control panel is mounted on the main body shell, an external light source and a monochromator are arranged in a first layer space inside the main body shell, a second layer space inside the main body shell consists of four cuvettes and a liquid pool positioned in the center, and a vortex oscillator and an ultrasonic dispersion system are arranged at the lower part of the inner wall of the main body shell.

The invention provides a tunnel point cloud adaptive elliptic cylinder filtering method based on affine constraint, and relates to the technical field of point cloud data processing, and the method comprises the steps: extracting a tunnel center line, and setting a cross section; initializing parameters of the elliptic cylinder model by using principal component analysis; setting an initial screening threshold value, and dynamically estimating an optimal threshold value by adopting an RANSAC (Random Sample Consensus) algorithm; constructing a multi-objective optimization function comprising a data fitting error term, a parameter smoothing constraint term and an affine transformation constraint term, and optimizing model parameters; and filtering the point cloud data based on the optimized model and the dynamic threshold. Affine transformation constraint and self-adaptive parameter constraint mechanisms are innovatively introduced, the constraint threshold is dynamically adjusted according to the local curvature and the deformation degree, a special recognition and processing mechanism is developed for a special area, the geometric continuity of the model and the adaptability to the complex environment are remarkably improved, and the method is suitable for large-scale popularization and application. The separation effect of noise points and structural points is improved, and a reliable data basis is provided for tunnel three-dimensional reconstruction and deformation analysis.

The present application relates to a kind of easy to dismantle buckle, including buckle body, elliptic cylinder is arranged above the bottom surface of buckle body, mounting hole is arranged in the bottom surface of buckle body and goes into the lower end of elliptic cylinder, the upper end of elliptic cylinder is not connected with buckle body, and recessed hole is arranged on the upper end surface of elliptic cylinder, and opposite clamping teeth are arranged on the side wall of recessed hole;Through hole is arranged at the corresponding place of buckle body and recessed hole.This technical solution realizes the fixation of four-way pipeline by four groups of opening and closing devices, and the disassembly between each pipeline is not affected by each other, can be independently operated, and the convenience and versatility are better.The present application realizes the fixation of four pipelines in limited space and designs the locking mechanism that is easy to disassemble, realizes the maximization of function and space utilization.The present application has mounting hole, sets up damping pad inside, and sets up shock pad outside, effectively improves the reliability and quietness after fixing.

The utility model relates to the technical field of tubular aerators, in particular to a tubular aerator membrane which comprises a membrane arranged on a pipeline aeration opening, the membrane comprises an inner layer, a bearing layer, an outer layer and a protective layer which are sequentially arranged from inside to outside, the membrane is of a hollow structure, and the front portion and the rear portion of the membrane are of an oval cylinder structure with openings. The opposite edges of the two sides of the membrane are each of a U-shaped structure. And the mounting and dismounting mechanism is fixedly arranged at the end part of the pipeline aeration opening and is detachably assembled with the membrane. Through the supporting function of the inner layer, the strength support of the bearing layer, the wear resistance of the outer layer and the bacteriostatic protection function of the protective layer, the effectiveness of the membrane in various application scenes is ensured, and the functions of all the layers supplement each other, so that the membrane can show excellent performance in actual use; and the membrane at the aeration port of the pipeline can be conveniently mounted and dismounted, and can be replaced or cleaned at any time, so that the service life of the membrane can be prolonged, and the maintenance is simple.

The invention provides a single-shaft type vibration exciter with an elliptic motion trail and a vibrating screen, relates to the technical field of vibration exciters, and mainly aims to solve the problem that the elliptic motion trail and the vibration angle of a three-shaft vibration exciter in the prior art cannot be specifically adjusted. The single-shaft type vibration exciter is mainly composed of a motor, a rotating shaft, an eccentric sliding block, a replaceable oval template and a base, when the motor drives the rotating shaft to rotate, a rolling wheel abuts against an oval cylindrical surface under the action of centrifugal force, the eccentric sliding block is forced to do oval motion in the radial direction of the rotating shaft, and the centrifugal force generated by the eccentric sliding block is transmitted to the base; therefore, the base generates vibration with an elliptical motion trail. Due to the fact that the elliptic cylindrical surface is in an elliptic shape meeting the material screening requirement, and the installation angle of the elliptic cylindrical surface is adjustable, accurate control over the elliptic motion trail and the vibration angle can be visually and concrete achieved. In addition, the single-shaft type vibration exciter and the vibrating screen have the advantages of being high in energy efficiency ratio and long in bearing service life.

The invention relates to a flow channel shape optimization method and a microfluidic device, the method is used for a flow channel with an obstacle on one side, and the method comprises the following steps: S1, for a semi-cylindrical or semi-elliptic cylindrical obstacle, determining the shape parameter of the obstacle; s2, according to the shape parameters of the obstacle, a corrected shell layer area is arranged in the area, adjacent to the obstacle, in the flow channel; and determining a shape parameter of the corrected shell layer region, so that scattering disturbance of the corrected shell layer region to the flow field is counteracted with scattering disturbance caused by an obstacle. According to the method, the additional flow resistance can be remarkably reduced, the circulation efficiency is improved, and the additional pressure drop caused by obstacles can be effectively eliminated by correcting the counteracting effect of the shell layer area on the scattering effect of the obstacles.

The application provides a three-dimensional camera perspective-based ellipse pattern generation method and system. The method according to the application comprises: transforming a three-dimensional curved surface to a local coordinate system of an elliptic cylinder to obtain a converted three-dimensional curved surface; obtaining user input, defining an elliptic cylinder based on the user input and a three-dimensional camera perspective; performing intersection detection calculation on the converted three-dimensional curved surface and the elliptic cylinder, and visually outputting the intersection result to obtain a final ellipse pattern; the method further comprises: dynamically adjusting an intersection condition in the intersection detection calculation process according to user demand; wherein the intersection condition comprises a value range of an intersection region. That is, the application provides a three-dimensional elliptic cylinder surface intersection detection method based on coordinate transformation. Points in a world coordinate system are converted to a local coordinate system of an elliptic cylinder, and an elliptic equation is combined for judgment, thereby realizing high-precision and high-efficiency geometric recognition and pattern generation.

To provide a cavitation surface treatment nozzle capable of giving a strong compression stress to a target object surface and promoting grinding of the target object surface.SOLUTION: A cavitation surface treatment nozzle 10 includes a nozzle tip 13. The nozzle tip 13 includes: a first plan surface 13a from which liquid is jetted and perpendicular to a jet axis 1; a second plan surface 13b perpendicular to the jet axis 1 and being an opposite surface from the first plan surface 13a; and a nozzle hole 21. The nozzle hole 21 includes: a semi-columnar discharge groove 23 arranged in the first plan surface 13a and extending in a first direction perpendicular to the jet axis 1; a jet hole 25 extending along the jet axis 1, connected to the discharge groove 23, having a long diameter extending in the first direction and having a right elliptic columnar shape having an oval cross section; and an introduction part 27 having a right circular cone surface 27a with the jet axis 1 as a center axis and connected to the jet hole 25.SELECTED DRAWING: Figure 4

The inner pipe arm lifting device comprises a fixing support and a driving mechanism fixedly connected with the interior of the fixing support, the upper end of the driving mechanism is fixedly connected with a running mechanism, and a self-adaptive mechanism is arranged on the outer side of the upper end of the running mechanism. A lifting platform is fixedly mounted at the upper end of the running mechanism, an elliptical cylinder and a cylinder are arranged on the upper side of the fixed support, and the cylinder is arranged in the elliptical cylinder in a sleeving manner; by arranging the stepping motor, accurate position control can be realized by utilizing the open-loop control characteristic of the stepping motor, the high transmission precision of the ball screw and the displacement encoder, so that high-precision positioning is realized, and the internal space of the circular tube is fully utilized through direct contact between the guide ball on the disc and the inner wall of the circular tube; extra external fixed guide rails are not needed, so that the overall structure is very compact, and the effects of compact structure and high space utilization rate are achieved.

The application discloses a local elliptic cylinder magnet magnetic field calculation method and system based on an equivalent magnetic charge method, establishes a local elliptic cylinder magnet magnetic field mathematical model, sets parameters of the local elliptic cylinder magnet, brings the parameters of the local elliptic cylinder magnet into the local elliptic cylinder magnet magnetic field mathematical model, solves the model, and obtains the magnetic field of the local elliptic cylinder magnet. The application can accurately and quickly calculate the space magnetic field of the local elliptic cylinder magnet magnetized in any direction in the xoy plane, is helpful for subsequent accurate solution of the magnetic field gradient, control of the space magnetic force, and analysis of the dynamic movement of the magnetic beads.

The invention discloses a circular and elliptic composite configuration double cyclone matched with a cyclone trapped vortex combustion chamber. The circular and elliptic composite configuration double cyclone comprises an inner cylinder, a middle cylinder, an outer cylinder, a venturi tube, N1 first blades and N2 second blades, the inner cylinder is a solid cylinder, the middle cylinder is a hollow cylinder, and the outer fixed cylinder is a hollow elliptic cylinder; the N1 first blades are uniformly arranged between the outer cylinder and the middle cylinder in the circumferential direction, and the N2 second blades are uniformly arranged between the inner cylinder and the middle cylinder in the circumferential direction, so that the inner cylinder, the middle cylinder and the outer cylinder are coaxially arranged from inside to outside; and the upstream of the venturi tube is coaxially and fixedly connected with the downstream of the middle cylinder, and the venturi tube is used for promoting crushing and atomization of fuel oil. According to the invention, gas is swirled through the first-stage circular swirler to generate an on-duty stable backflow area so as to ensure the stability of on-duty flames; meanwhile, through the two-stage oval swirler, high-speed rotating jet flow is generated in a main combustion area of the head of the combustion chamber, oil and gas mixing is promoted, and the structure of the novel trapped vortex combustion chamber is matched with that of the novel trapped vortex combustion chamber on the basis of guaranteeing flame stability.

The utility model relates to the technical field of building construction, in particular to an elliptic cylinder for constructional engineering, which comprises two first support bodies, the two first support bodies are the same in shape and size, the corresponding surfaces of the two first support bodies are fixedly connected to form the elliptic cylinder, and a plurality of transverse ribs and a plurality of vertical ribs are arranged on the two first support bodies. A plurality of first through holes are formed in the transverse ribs, a plurality of second through holes are formed in the vertical ribs, connecting plates are arranged at the tops and the bottoms of the two first supporting bodies, reinforcing ribs are arranged at the tops of the connecting plates, threaded holes are formed in the connecting plates, and through ingenious structural design and reasonable material selection, high strength and high stability are achieved; and the elliptic cylinder is suitable for various constructional engineering scenes needing to be supported or decorated by the elliptic cylinder.

The present invention discloses a method for utilizing fluid-induced vibration energy based on an actively rotating elliptical cylinder, comprising: Step 1, introducing a physical model of a rotating elliptical cylinder into a pre-constructed external flow field to obtain a corresponding physical model of the flow field; Step 2, using a high-precision numerical simulation method to simulate the physical model of the flow field to obtain the distribution of the flow field over time and the motion data of the rotating elliptical cylinder; Step 3, analyzing the vibration response results of the rotating elliptical cylinder according to the data obtained in Step 2 to obtain the characteristics of the amplitude change and the law of the reduced velocity varying with the rotation frequency at lock-in. The method provided by the present invention aims to significantly increase the peak amplitude of vibration in the resonance region and enhance the vibration stability by endowing the elliptical cylinder with the degree of freedom of active rotation, optimizing the aspect ratio of the elliptical cylinder, and actively adjusting the rotation speed.

The application discloses a borehole wall roughness measurement system and method. The method comprises the following steps: creating a general elliptic cylindrical surface fitting equation, and creating a fitting reference surface according to the general elliptic cylindrical surface fitting equation; configuring the fitting reference surface in a borehole wall coordinate system; expanding the borehole wall coordinate system along the fitting reference surface to obtain an expanded plane of the fitting reference surface; obtaining a plurality of axial sampling lines parallel to a borehole axis of the expanded plane; obtaining borehole axial profile lines corresponding to the axial sampling lines; and obtaining axial roughness evaluation parameters of the borehole axial profile lines.

The present invention relates to a microreactor and a method for preparing nanoparticles, comprising a main channel and at least two flow channels connected in sequence, each flow channel being connected in series; the cross section of the flow channel is rectangular, a first side wall of the flow channel is provided with a first semi-elliptical cylindrical protrusion connected to the flow channel, a first semi-elliptical cylindrical diverter is provided in the flow channel; a second side wall is provided with a second semi-elliptical cylindrical protrusion connected to the flow channel; a fourth side wall is provided with a third semi-elliptical cylindrical protrusion connected to the flow channel; the second and third protrusions are symmetrically distributed along the length of the flow channel; a fourth semi-elliptical cylindrical protrusion connected to the flow channel is provided on the third side wall, and a second semi-elliptical cylindrical diverter is provided in the flow channel. The present invention maximizes the reaction intensity of the homogeneous microreactor by introducing a three-dimensional secondary flow structure, while minimizing the distance required for the reaction.

The clamp spring auxiliary installation device comprises a workbench, a clamp spring containing table is arranged on the workbench and installed on a supporting table through a sliding sleeve, a round clamp spring groove is horizontally formed in the upper surface of the end of the clamp spring containing table, and a workpiece hole is formed in the bottom of the clamp spring groove; a through hole is also formed in the supporting table, a vertical groove is formed in the end of the clamping spring containing table, and the vertical groove communicates with the clamping spring groove; a driving assembly is further arranged on the workbench, an inner supporting assembly is arranged on the driving assembly, the inner supporting assembly is arranged at the end, close to the clamping spring groove, of the clamping spring containing table, the inner supporting assembly comprises a vertically-arranged driving plate, and an elliptic cylinder is arranged at the end, close to the vertical groove, of the driving plate; the axis of the elliptic cylinder is parallel to the plane of the driving plate, and a limiting plate is arranged at the top of the elliptic cylinder. The problems that the expansion process of the clamp spring cannot be accurately controlled, the clamp spring is easy to pop out or deform, and the fatigue strength is high are solved.

The invention discloses double-mechanical-arm cooperative automatic oil taking equipment, and relates to the technical field of oil taking equipment.The double-mechanical-arm cooperative automatic oil taking equipment comprises a double-mechanical-arm robot body and further comprises an oil taking assembly arranged on one side of the double-mechanical-arm robot body, and for insulating oil which is used for a short time and has few impurities, a straight flow channel is adopted for sampling, so that impurity interference is reduced; for the insulating oil which is used for a long time and sinks to the bottom, through the modes that the inner wall of the spiral flow channel adsorbs impurities, the stopping block stops and stirs an oil sample, the flow line of the insulating oil is changed, the contact area is increased and the like, the impurities flowing out along with the oil are effectively reduced, the impurities are prevented from interfering a detection instrument, the misjudgment or missed judgment risk of transformer faults is reduced, and the detection accuracy is improved. When the blocked insulating oil bypasses the elliptic cylinder, the flow speed is increased due to the limited flowing space, a low-speed wake flow area is formed behind the elliptic cylinder, vortex motion is generated, oil samples are promoted to be fully mixed, sampling deviation caused by local concentration difference is avoided, and the detection accuracy and reliability are further improved.

The utility model relates to the technical field of budget showing stands, and discloses an angle-adjustable budget showing stand which comprises a frame, rotating rods are rotationally connected to the left side and the right side of the top of the frame respectively, adjusting grooves are formed in the two rotating rods respectively, and first connecting rods are rotationally connected to the outer sides of the two rotating rods respectively. Rotating handles are fixedly connected to the outer sides of the two first connecting rods correspondingly, first bevel gears are fixedly connected to the adjacent ends of the two first connecting rods correspondingly, elliptic cylinders are slidably connected to the upper ends and the lower ends of the two adjusting grooves correspondingly, and threaded rods are in threaded connection to the adjacent ends of the interiors of the multiple elliptic cylinders correspondingly; the adjacent ends of the multiple threaded rods are fixedly connected with second bevel gears. According to the utility model, the elliptic cylinder is controlled to slide inwards and outwards by rotating the rotating handles on the two sides of the frame, the fixed frame is adjusted to a comfortable angle after the elliptic cylinder slides inwards, and then the elliptic cylinder is controlled to slide outwards to abut against the frame by rotating the rotating handles reversely.

The application discloses a tunnel excavation face limit support force calculation method based on a whole analysis method, and comprises the following steps: step 1: a limit support force calculation model of an excavation face is proposed based on the whole analysis method; step 2: according to the theoretical model, a calculation formula of the limit support force of a shield excavation face is derived; and step 3: a corresponding loose zone model of a shield tunnel damage is proposed, wherein the model comprises a shallow-buried shield tunnel damage model and a deep-buried shield tunnel damage model. The whole analysis method is applied to the excavation face stability problem, and a calculation model of the excavation face stability is established. According to the tunnel deep and shallow burying, an elliptic cylinder-type general arch model considering the soil arching effect is established. The limit support force obtained by the application presents a consistent development trend with the numerical simulation and the existing theoretical results. In addition, the calculation time of the analytical solution is far less than the calculation time of the numerical simulation, and a new idea is provided for the design of the limit support force of the excavation face.

The invention discloses a supporting device of an elliptic cylinder radar, and relates to the technical field of radar structures. The supporting device comprises a radar body, the radar body sequentially comprises a radar rear boundary, a radar rear end, a radar front end, an antenna part and a radar front boundary from back to front, and the two sides of the radar front end and the two sides of the radar rear end are fixedly provided with a first supporting frame and a second supporting frame through fixing bolts; and two groups of limiting and leveling pieces are arranged between the first supporting frame and the second supporting frame which are arranged on the same side. The radar main body is effectively supported through the first supporting frame and the second supporting frame, the connecting stability of the first supporting frame and the second supporting frame is further improved in cooperation with the limiting leveling piece, the stability requirement of the radar main body in the three-axis six-direction direction can be met, stable supporting guarantee can be provided in the radar main body transferring process, and the stability of the radar main body is improved. And the structure is convenient to adjust, the radar main body can be tested without disassembly, and both the transfer efficiency and the test efficiency are considered.

The application discloses a kind of double mechanical arm collaborative automatic oil taking equipment, it is related to oil taking equipment technical field, including double mechanical arm robot body, still include: the oil taking assembly of being arranged in double mechanical arm robot body one side, for the insulating oil of little impurity that is used shortly, direct channel sampling is adopted, reduce impurity interference, for the insulating oil of impurity bottoming that is used for a long time, by screw flow passage inner wall adsorption impurity, block block and agitate oil sample, change insulating oil streamline increase contact area etc., effectively reduce the impurity with oil flow out, avoid impurity interference detection instrument, reduce the misjudgment or the risk of missing judgment to transformer fault, improve detection accuracy, the dispersion component of flow outlet inner wall makes the insulating oil that is blocked in bypassing oval cylinder, because flow space is limited, flow rate increases, low-speed wake region is formed behind oval cylinder, vortex motion is generated, promote oil sample fully mixed, avoid local concentration difference to cause sampling deviation, further improve detection accuracy and reliability.

The present invention relates to a design method for a test model of the ultimate bearing capacity of a column structure, comprising the following steps: the first step: the column is an elliptical column, in a three-dimensional coordinate system, the coordinate origin O is the center of the ellipse of the bottom section of the column, the X axis is the direction of the major axis of the elliptical section, the Y axis is the direction of the minor axis of the elliptical section, and the Z axis is the height direction of the column; the second step: the major axis of the elliptical section is ≥2m, the height of the elliptical column is ≥3m, and the ultimate bearing capacity in the height direction is ≥500t; the third step: a bottom plate is provided at the bottom end of the column, the length of the bottom plate is 1.1-1.2 times the major axis of the elliptical section, and the width of the bottom plate is 1.2-1.3 times the minor axis of the elliptical section; the fourth step: a plurality of transverse brackets and longitudinal brackets are provided between the column and the bottom plate. The present invention can provide technical means for studying the damage mechanism and failure mode of large column structures under extreme compression loads, and thus provide support for the design of large column structures.

The invention relates to a necklace anti-pull structure, comprising a necklace, wherein a first connector and a second connector are fixed at both ends of the necklace respectively; a socket for inserting the second connector is arranged at the end of the first connector, and a damping rubber sleeve matched with the second connector is fixedly arranged in the socket; the inner hole of the damping rubber sleeve is in the shape of an elliptical cylinder; the second connector is in the shape of a cylinder, and a plurality of groups of arc-shaped protrusions are symmetrically arranged on the side surface; during assembly, the second connector is inserted into the damping rubber sleeve in the socket, at which time the arc-shaped protrusions are aligned with the two elliptical ends of the inner hole of the damping rubber sleeve, and the second connector is rotated after being inserted into place, so that the arc-shaped protrusions squeeze the damping rubber sleeve to deform it, and a positioning effect is achieved by relying on the squeezing force. When encountering external pulling force, when the arc-shaped protrusion is pulled out of the socket, the damping rubber sleeve and the arc-shaped protrusion interact with each other to form a damping buffer, thereby achieving the effect of preventing the necklace itself from being torn off.

The invention discloses a blade deformation detection method based on laser correlation sensors and feature point extraction. The method comprises the following steps: mounting an elliptic cylinder baffle plate vertical to the cross section of a hub on the hub of a ducted fan; the transmitting end and the receiving end of the laser correlation sensor are installed on the same straight line, and it is ensured that the straight line is tangent to a hub of the motor fan. A plurality of feature reference points with high-contrast colors are uniformly marked on the leaves; when the laser correlation sensor is triggered, the high-speed camera connected with the laser correlation sensor is used for shooting a static image and a dynamic image of the blade in an external triggering manner; performing similarity screening on the collected images; and calculating a deformation vector by comparing the relative positions of the feature points in the static image and the dynamic image so as to judge the deformation degree of the blade. According to the invention, high-precision and real-time monitoring of the blade deformation of the ducted fan can be realized, the accuracy and efficiency of blade deformation detection are improved, blade deformation abnormity can be found in time, corresponding maintenance measures can be taken, and safe and stable operation of the ducted fan is ensured.

The utility model discloses a measuring device for a cylinder, an elliptic cylinder and a spherical surface, which comprises a sliding sleeve, a movable measuring probe slides in the sliding sleeve, the bottom end of the movable measuring probe penetrates out of the sliding sleeve, the sliding sleeve is provided with scale marked lines along the length direction of the sliding sleeve, and the movable measuring probe is provided with indication marked lines; a connecting bottom frame is arranged on the outer side of the sliding sleeve, and a plurality of measuring supporting legs are connected to the bottom of the connecting bottom frame. The beneficial effects are that a plurality of measuring support legs are in contact cooperation with a to-be-measured surface, the movable measuring probe moves up and down, so that the indicating marking line indicates the scale marking line on the sliding sleeve, the radius / diameter of the outer wall of a cylinder, the radius / diameter of the long side / short side of an elliptic cylinder and the radius / diameter of a spherical surface can be measured, and the device is simple in overall structure and convenient to operate. Operation is simple, using is convenient, and the application range is wide.

The present invention belongs to the technical field of communication optical cables and discloses a multi-unit, self-supporting butterfly-shaped optical drop cable comprising at least two identical butterfly-shaped drop units, a protective housing, and multiple reinforcement members. The butterfly-shaped sheath of the butterfly-shaped drop unit is formed in the shape of a portion of two elliptical cylinder surfaces, and the butterfly sheath also has a flat surface. The protective housing is composed of 2n shell bodies and extension bodies. All the shell bodies are sequentially connected to form a closed structure with a shell cavity formed inside. The extension body extends outward from the top of the shell body. The butterfly-shaped drop unit is located within the shell cavity. The extension body has at least two sequentially arranged extension holes; the reinforcement members are located within the extension holes, where n is a positive integer. The present invention has the following major beneficial technical effects: a novel, simple, and easy-to-manufacture structure, excellent anti-bite performance, high tensile strength, stable and reliable optical performance, a more reasonable number of drop units, and more reliable fixation.