80results about How to "Avoid mechanical properties" patented technology

The invention relates to an agricultural robot, and discloses an animal husbandry pushing robot autonomous navigation method based on a laser radar, which comprises a microsecond-level multi-sensor time synchronization architecture based on an FPGA (Field Programmable Gate Array); in a navigation layer, seamless switching between the GNSS and the laser SLAM is realized by constructing a virtual fusion observation value by utilizing extended Kalman filtering and a self-adaptive dynamic weight algorithm; in the sensing layer, an RGB-I multi-mode model fused with laser reflectivity and a biological micro-motion detection technology are adopted, and feed and biological obstacles are accurately distinguished; and in the execution layer, flexible self-adaptive material pushing is achieved in combination with material groove edge fitting and force-position hybrid control, and the navigation precision, the operation quality and the safety of the material pushing robot in the all-weather and unstructured pasture environment are effectively improved.

A kind of vocal cord repair device based on advanced biological printing technology assisted, comprising: imaging positioning component, including endoscope imaging module and three-dimensional reconstruction processor;Surgical operating component, including glottis exposure mechanism and elephant trunk type flexible mechanical arm, glottis exposure mechanism exposes glottis to provide field of view, and mechanical arm high-precision operation;Biological repair component, including micro printing head, compatible hydrogel, injection tube and motion control mechanism, realize vocal cord reconstruction and function recovery.Integrate biological printing component and imaging positioning component, system can accurately obtain the three-dimensional structure data of vocal cord damage area, and realize the millimeter level accurate deposition of biological material, so that the millimeter level precision of imaging positioning, micron level operation of mechanical arm and controllable printing of biological material form closed loop feedback system, improve the overall success rate of vocal cord repair, realize the leap of vocal cord repair from "empirical operation" to "precision engineering", provide safer and more effective treatment options for patients with vocal cord dysfunction.

The invention provides an engine in-cylinder brake test bench and a test method, relates to the technical field of engine test, and aims to solve the problem that an existing test bench cannot reproduce valve lift loss under a real high-pressure load. In the process that a power driving source drives a cam shaft to force a brake valve to open, the loading mechanism continuously applies a reverse mechanical acting force to the valve, so that a huge blocking load generated by high-pressure gas in a cylinder to the valve in a compression stroke of a real engine is approximately simulated physically; the valve and a transmission mechanism of the valve are passively in a real high-load stress state, so that lift reduction caused by elastic deformation or hydraulic compression of parts is simulated, a high-load operating environment in a cylinder is effectively restored, and real dynamic data including actual lift loss are measured.

The invention relates to a high-intensity focused ultrasound-assisted laser lift-off method, and belongs to the technical field of silicon carbide wafer lift-off. The method comprises the following steps: a, forming a modified layer: providing a silicon carbide crystal ingot, positioning a laser focus point F of a pulse laser ray L at a preset depth in the silicon carbide crystal ingot by adopting the pulse laser ray L with the wavelength permeable to the silicon carbide crystal ingot, and forming the modified layer in the silicon carbide crystal ingot by relatively moving the silicon carbide crystal ingot and the laser focus point F; and b, a wafer stripping step: providing a high-intensity focused ultrasound generating device. According to the invention, the fundamental innovation of the stripping mechanism is realized, the stripping efficiency is high, the action position is accurate, and the damage is more controllable; energy is highly concentrated and precisely acted, energy dispersion is avoided, and the stripping precision is improved; process integration is achieved through synchronous machining, the problems of secondary clamping, interface re-healing and the like are avoided, and efficiency and consistency are improved; the thermal damage and the mechanical damage are obviously reduced; by adjusting the focus position, the system can adapt to complex structures and deep modification.

The invention relates to the technical field of water conservancy project automation control, and discloses a water conservancy facility operation state monitoring system based on digital twinning, and the system comprises a data collection unit which is used for collecting a basic control instruction and an actual measurement state response of an execution mechanism in real time; the generalized impedance observation unit is used for calculating the state deviation between the actually measured state response and the theoretical reference trajectory and mapping the state deviation into an equivalent disturbance quantity; the track time base modulation unit is used for establishing a load-time base association rule of the equivalent disturbance quantity and the time scaling factor; the nominal model simulation unit is used for generating a theoretical reference trajectory under the constraint of a time scaling factor, the generation rate of the theoretical reference trajectory is actively reduced through a load time base association rule when it is detected that the system resistance is increased, and the safety space of an execution mechanism is replaced by time; and the contradiction between the execution capability decline of the aged water conservancy facility and the rigid control target is solved.

The invention discloses a boron carbide composite ceramic tool bit and a preparation method thereof. The boron carbide composite ceramic tool bit comprises a tool bit body and a welding transition body, the tool bit body is internally provided with a boron carbide ceramic framework with a three-period minimal curved surface topological structure, three-dimensional communicating holes of the framework are filled with a metallic bond and diamond abrasive particles, and the welding transition body is a pure metallic bond transition layer. A hard wear-resistant phase is arranged on the outer surface of the combination body. The method comprises the following steps: constructing a boron carbide ceramic skeleton with a pore surface micro-nano diversion trench through additive manufacturing, and depositing an electromagnetic sensitive phase; injecting the powder into the three-dimensional communicated pores and assembling a green body; applying mechanical oscillation pressure and a high-frequency alternating electromagnetic field at the sintering temperature, and inducing an in-situ metallurgical reaction by utilizing local joule heat generated by a skin effect to finish densification sintering; and a surface hard wear-resistant phase is generated through chemical heat treatment or component in-situ reaction. Compact interlocking of the internal structure is achieved, the service life of the tool bit is prolonged, and the welding strength of the tool bit is improved.

The application discloses a three-level coordinated production line body intelligent control method and system, and belongs to the technical field of intelligent manufacturing. The method comprises the following steps: establishing a global task planning layer, performing semantic analysis and logical disintegration at a first preset frequency, and generating an atomic action sequence; establishing a local space perception layer, receiving the atomic action sequence at a second preset frequency, constructing a dynamic local map by using sensor data, determining a workpiece pose by point cloud registration, and mapping the atomic action sequence into a continuous motion trajectory flow; establishing a real-time action execution layer, receiving an instantaneous target pose at a third preset frequency, calculating a theoretical driving torque by combining a Lagrange dynamics equation, switching to an impedance control mode at a contact moment, and driving an execution mechanism to complete work; and establishing an asynchronous coordination layer, realizing three-layer asynchronous communication through an industrial network, and controlling the three-layer frequencies to be distributed in a ladder type in an increasing manner. The application has the effects of improving the flexibility, precision and safety of a production line.

This utility model relates to the field of road surface maintenance technology in municipal engineering, and more particularly to a leveling device for road surface maintenance in municipal engineering. It solves the problem in existing technologies where the height adjustment mechanism lacks a locking device, leading to loosening of the adjustment components and loss of height control due to vibration during operation. The leveling device for road surface maintenance in municipal engineering includes two mounting frames and a mounting plate positioned between the two frames. Both sides of the bottom of each mounting frame are equipped with casters, and each mounting frame contains a lifting rod. The two ends of the lifting rod are connected to the interior of the mounting frame via a vertical guide structure, and the top of the lifting rod is connected to the top of the mounting frame via a vertical adjustment structure. This utility model, through the cooperation of the lifting rod and the detachable locking structure, achieves rigid fixation after adjustment, effectively preventing height changes caused by operational vibration and improving the stability and accuracy of the leveling operation.

This utility model discloses a mud scraper structure for a tracked excavator, belonging to the technical field of tracked excavators. It includes a mud scraper, a first positioning plate, and a second positioning plate. The side of the mud scraper has a locking groove, which engages with the track plate. The upper end of the mud scraper is provided with the first and second positioning plates, which are connected to the mud scraper and engage with the track ribs on the track plate. This structure efficiently removes mud, sand, and other deposits from the chassis, preventing chassis corrosion or mechanical component failure due to long-term accumulation, reducing unnecessary friction and load, and protecting the structural integrity of the chassis and related components. Furthermore, the engagement with the track plate via the locking groove and with the track ribs via the first and second positioning plates ensures secure installation, easy disassembly, and convenient replacement after damage.

The application belongs to the technical field of power system automatic control, and relates to a power equipment safety regulation system based on data analysis, which comprises a data acquisition unit, a state space analysis unit and a nonlinear adaptive regulation unit; a running state space is constructed by using a real-time output state sequence, a state offset modulus of a state point relative to a safety boundary is solved; then a control gain is dynamically mapped according to the modulus, and an integral link is constrained by using a body temperature change rate data, so as to output a safety regulation instruction; a system built-in parameter baseline back-off logic is provided; through dynamic mapping of a running state to a control parameter space, the application realizes mode conversion of power equipment from passive over-limit removal to active energy envelope regulation, effectively solves the mutual exclusion contradiction between regulation response bandwidth and steady-state accuracy, and improves the nonlinear disturbance receiving capacity of a hub node under a 50Hz fundamental frequency.

The invention provides a grating compression device, a compression method thereof and an optical fiber laser system. The grating compression device, the compression method thereof and the optical fiber laser system have the following beneficial effects that after being diffracted by the grating in the cavity, laser is reflected between mirrors such as the grating in the device to be compressed, and a light beam compressed by the grating can be translated by a certain distance in the vertical direction and is transmitted in the reverse direction through the basic turn-back mirror; the volume of the grating compressor is effectively reduced, and the cost is saved; and the angle between the incident laser and the grating pair and the distance between the grating pairs are adjusted through electric control, so that the device is adaptive to different laser systems, high-precision control of dispersion compensation amount is realized, and introduction of mechanical clearance or angle deviation caused by manual adjustment is avoided.

The utility model relates to the technical field of ellipsometer application, in particular to an ellipsometer platform capable of synchronously adjusting light paths. An ellipsometric platform capable of synchronously adjusting light paths comprises a base and a parallelogram connecting rod mechanism vertically arranged on the base, and the parallelogram connecting rod mechanism comprises a first connecting rod, a second connecting rod, a first laser fixing plate, a second laser fixing plate, a fixing pin and an adjusting block capable of moving in the vertical direction; one end of the first connecting rod is hinged with the adjusting block, and the other end is hinged with the upper end of the first laser fixing plate; one end of the second connecting rod is hinged with the adjusting block, and the other end is hinged with the upper end of the second laser fixing plate; the lower end of the first laser fixing plate and the lower end of the second laser fixing plate are both hinged to a fixing pin. Based on the parallelogram principle, geometric forced synchronization of an incident angle and a reflection angle is achieved, angle adjustment is simple, and cost is moderate.

The application provides a carbon block loading and unloading device, which comprises a loading and unloading station mechanism and a second conveying line; a clamping jaw assembly is movably installed on a rack and reciprocally moves between a car space and the first conveying line; the clamping jaw assembly clamps the carbon block in the car space and moves the carbon block in the car space to the first conveying line when moving towards the car space; the carbon block is transferred to the first conveying line under the driving of the clamping jaw assembly and is conveyed along the conveying direction of the first conveying line; at this time, the feeding end of the second conveying line is connected to the output end of the first conveying line, and the output end of the second conveying line is connected to the arrangement line; the carbon block is moved from the first conveying line to the second conveying line and is directionally shaped by the shaping assembly in the second conveying line, so that the carbon block is input to the arrangement line in the same direction, thereby realizing the automatic transfer of the carbon block between the car space and the arrangement line, avoiding manual transfer or semi-mechanical transfer, and improving the loading and unloading efficiency of the carbon block.

This invention discloses a modular, environmentally friendly metal-enclosed switchgear, specifically relating to the field of power distribution switchgear technology. It includes: a mounting box, a cabinet, a first track, a second track, a slide rail, and a floating mechanism. The cabinet comprises a rectangular shell composed of multiple plates. An elastic reset structure is provided on the inner side of the rectangular shell. The rectangular shell deforms under the pressure of the mounting box, allowing the elastic reset structure to provide elastic support for the rectangular shell in the horizontal plane, thereby compensating for the assembly tolerance between the mounting box and the slot. This invention, by providing slide rails on both sides of the mounting box, which cooperate with the first and second tracks on the inner side of the cabinet, constitutes a stable dual-track guiding system. This significantly reduces the resistance during the insertion and removal of the mounting box, achieving nearly interference-free smooth sliding, thereby greatly reducing wear on the guide surface and contact surface, and extending the overall service life of the drawer module and the cabinet.

The application discloses a kind of biocompatible materials and preparation method for bionic porous intervertebral fusion cage, belong to intervertebral fusion cage material technical field.A kind of biocompatible materials for bionic porous intervertebral fusion cage, by weight parts includes the following components: polyether ether ketone 65-80 parts, modified functional filler 15-25 parts, hydroxyapatite 8-12 parts, flow modifier 0.5-1 part;The modified functional filler is graphene oxide coated modified barium titanate functional filler.By introducing surface conductive modified nano piezoelectric ceramic particles, realize the effective conversion and transmission of mechanical stimulation to bioelectric signal, this microstructure design makes the insulating polyether ether ketone matrix possess the electric activity of simulating natural bone stress-electric signal response mechanism, so as to be favorable to activate osteoblast activity and promote bone integration of implant interface.

This invention relates to the field of furniture metal frame processing and provides a CNC laser cutting device for metal frames. The device includes a limiting frame, which comprises a multi-stage drive frame and multiple multi-position limiting beams mounted on the multi-stage drive frame. These multi-position limiting beams are used to limit the metal sheet. Each multi-position limiting beam includes multiple unit limiting beams arranged in a straight line in an array. Each unit limiting beam includes an L-shaped guide block with a laterally adjustable position. A support plate with a longitudinally adjustable position is slidably mounted on the L-shaped guide block. An adjustable-height pressing plate is mounted on the support plate. This device achieves multi-point dispersed staggered limiting of the metal sheet based on overall limiting, flexibly responding to the disappearance of the limiting force at the cutting edge during cutting, ensuring flexible and real-time provision of limiting force at the cutting point of the metal sheet, and improving the stability of the metal sheet during the cutting process.

The invention discloses an electromagnetic shielding-based layered wiring structure with a main manipulator easy-to-disassemble design. The structure comprises a structural member serving as a supporting framework and an easy-to-disassemble shell detachably mounted on the outer side of the structural member, and the structural member and the easy-to-disassemble shell are matched to form a wiring space; a guiding shielding piece is arranged in the wiring space and divides the space into at least two physical levels, and the guiding shielding piece is used for guiding different types of main wire harnesses to conduct layered wiring and achieve electromagnetic shielding. In addition, a first closed space formed by a fixing plate and an electromagnetic shielding cover is arranged in the base frame so as to contain a control element, and the tail end holding rotation mechanism guides the cable to be arranged in a split mode through the wiring open groove and the axial channel. According to the invention, electromagnetic crosstalk is effectively inhibited through layered shielding wiring, and the signal precision is improved; the maintenance process is simplified by utilizing the easy-to-disassemble shell; and through a scientific wiring path, the abrasion and shearing risks of the cable under complex movement are prevented, and the reliability and durability of the main manipulator of the surgical robot are remarkably enhanced.

This invention discloses a vehicle compartment protection device, including a vehicle compartment body, a roller structure rotatably connected to the top of the rear door, and a flexible roller shutter structure connected thereto. The roller structure can rotate to roll up or lay down the flexible roller shutter structure to open or close the rear door of the vehicle compartment. It also includes a drive assembly for transmitting the roller structure, a stop system for detecting the rolling or laying position information, and a main control module electrically connected to both. This invention controls the drive assembly by receiving signals from the stop system through the main control module, realizing the automatic opening and closing of the rear door and its stopping at the designated position. When rolled up, the flexible roller shutter structure does not occupy any space for entry and exit through the rear door, ensuring rapid loading and unloading of materials and personnel; when laid down, it completely encloses the rear door of the vehicle compartment from top to bottom, effectively preventing materials from slipping or being lost during transportation. This invention combines the advantages of fully enclosed protection with unobstructed and rapid loading and unloading, has a reliable structure, and is particularly suitable for transport vehicles such as military trucks that require rapid response and material protection.

The application discloses a kind of based on anti-amplitude and rate saturation paddle drive unmanned vehicle formation control method, belong to unmanned vehicle formation control technical field.The existing paddle drive unmanned platform executor is aimed at solving the problem of control failure and system oscillation caused by amplitude and rate saturation constraint in physical level, including: paddle drive unmanned vehicle dynamics model is established integrated executor dynamic characteristics;Based on the dynamics model, the control constraint model for paddle drive unmanned vehicle is constructed;Design anti-saturation formation cooperative control law under combined connected topology.The method offsets saturation deviation by auxiliary compensation system, and combines neural network to estimate system disturbance online.The amplitude and rate saturation problem of paddle drive unmanned vehicle under the vertical plane working condition is solved, the formation stability is maintained under the topology switching environment, and the control accuracy and safety of the system are improved.

An optical path device, an optical detection method and a detection device, the optical path device comprising a side incidence optical path assembly and a lens assembly, the side incidence optical path assembly comprising a detection light source and an expander mirror set, the detection light source providing an incident light beam, the expander mirror set being configured to spread and shape the incident light beam in a first direction to form parallel first direction detection light beams and to spread and shape the incident light beam in a second direction to form non-parallel second direction detection light beams; the first direction detection light beams exiting the lens assembly to form a light spot on a surface to be detected of an object to be detected; the second direction detection light beams non-parallelly entering a surface of the lens assembly and having a beam size, the second direction detection light beams exiting the lens assembly to the surface to be detected and forming the light spot. The present application provides a detection optical path avoiding a central aperture of the lens assembly, which can effectively reduce the risk of lens damage and achieve more reliable and efficient wafer defect detection.

The invention relates to a round pipe stand column assembling tool, in particular to a large-pipe-diameter round pipe stand column on-site opening convenient assembling tool which comprises two semicircular pipe clamps symmetrically arranged on the outer side of a round pipe stand column with the to-be-adjusted wrong leather weight, the two semicircular pipe clamps can be spliced into an annular clamping structure, and a plurality of adjusting supports are arranged on the outer walls of the semicircular pipe clamps. Each adjusting support is provided with an adjusting assembly, each adjusting assembly comprises a screw rod and a rotating rod head fixedly connected to one end of the screw rod, the rotating rod heads are rotated to drive the screw rods to move front and back in the axial direction of the screw rods, and the large-pipe-diameter round pipe stand columns are pushed to achieve position adjustment. Semicircular pipe clamps capable of being spliced are arranged on the outer side of a circular pipe, and a plurality of adjusting assemblies capable of being independently finely adjusted are used for directly abutting against the pipe wall to conduct position adjustment, so that thermal damage and mechanical damage caused by a traditional horse plate welding mode to circular pipe base metal are avoided, the field port assembling precision is guaranteed, welding material consumption and labor input are reduced, and the production efficiency is improved. Therefore, the construction efficiency and progress are improved.

The present application relates to rotary excavator control method technical field, especially in kind for rotary excavator multi-cylinder synchronous PID control method and system, the method includes S1, hardware foundation, S2, inner and outer ring PID control, S3, work mode judgment, S4, normal synchronous mode, S5, blocked follow mode, S6, fault protection mode, the present application is under normal synchronous mode condition, according to displacement outer ring control generates the actual basis speed of each oil cylinder independence and increases cross coupling speed compensation mechanism, improves the synchronization accuracy between multi-cylinder, realizes the horizontal synchronous displacement of multi-cylinder, when the blocked situation appears to certain oil cylinder, limit the remaining oil cylinder to follow in the vicinity of the blocked cylinder, avoid structural deformation and mechanical hard top, when oil cylinder appears serious anomaly, the system turns into fault protection mode, to oil cylinder speed zero and outputs fault alarm and stop interlock, realizes equipment safety protection.

This invention discloses an automated crop planting device for cuttings, relating to the field of agricultural machinery. It includes a planting cylinder and a lifting platform. The upper part of the planting cylinder has a seedling delivery component within a seedling separation chamber. Its trumpet-shaped support plate, with its wide opening facing upwards, accommodates seedlings. A concentric seedling separation plate at the bottom is driven to rotate by an independent motor. Mechanical single-plant separation is achieved through seedling holes and notches. Seedlings fall under gravity through the delivery tube into the lower cutting chamber. The rotation speed of the seedling separation plate is linked to the walking speed and the cutting frequency to ensure proper spacing between plants. The cutting chamber is equipped with an adaptive cutting component. Seedlings fall between a pair of synchronously rotating inward-facing conveying gears, and are elastically clamped by a tension spring to adapt to irregular shapes and avoid damage. Simultaneously, the V-shaped clamp of the vertical cutting component moves downwards to correct tilting, achieving precise vertical insertion of seedlings into the soil. This device realizes mechanical single-plant separation, elastic adaptive clamping, and vertical cutting, improving operational efficiency and survival rate.

The invention relates to the technical field of material tensile test detection, and discloses a ceramic matrix composite material high-temperature tensile creep test device, which comprises a tensile testing machine, a liftable lifting plate is arranged on the tensile testing machine, a first clamp is mounted on the tensile testing machine, and the first clamp is mounted on the tensile testing machine through a vertical rod; a first clamp is mounted on the lifting plate, a second clamp is mounted on the lifting plate through a vertical rod, the first clamp is arranged right opposite to the second clamp, a fixing plate is fixed on the tensile testing machine body, and the fixing plate is arranged in the height direction of the tensile testing machine. According to the invention, through a closed cover body structure formed by splicing the double moving covers, the ceramic matrix composite material in the testing process is completely wrapped, so that high-speed chippings generated when the material is broken are effectively prevented from splashing, and mechanical injury and high-temperature scalding risks to operators are avoided.

The application discloses a kind of virtual-real migration closed-loop feedback training methods based on three-dimensional brain organoids, the method of the application adopts the technical route of "virtual-real migration", and three-dimensional brain organoids are trained by multimodal closed-loop feedback, i.e. Environmental feedback, punishment feedback and reward feedback effectively avoid the long time mechanical debugging and hardware wear problems caused by traditional physical environment training. In particular, in the initial training period, this method avoids the mechanical vibration caused by the violent collision of real mobile robots, prevents the damage of mechanical hardware and the damage of brain organoids activity, so as to maintain the activity of biological computing carrier and the stability of signal acquisition to the greatest extent while ensuring the training intensity.

The present application relates to a kind of reversible immunomagnetic beads for quickly separating target cells and its preparation method. Specifically, the present application provides a kind of reversible immunomagnetic beads, which includes magnetic carrier, affinity ligand and the connecting arm of the connection between the two, wherein the connecting arm contains a nucleotide sequence that can be specifically recognized by enzyme cutting, preferably containing deoxyinosine (dI) base.The present application also provides a kit comprising the magnetic beads and specific cleavage enzyme (such as endonuclease V).The magnetic beads of the present application can be cleaved by enzyme to achieve mild and rapid dissociation of the magnetic beads and target cells, with high separation efficiency and good cell viability, solving the problem of cell damage caused by irreversible binding of traditional immunomagnetic beads.The present application is simple to operate, does not require complex equipment, and the separated cells can be directly used for in vitro expansion, differentiation or cell therapy, and has wide research and clinical application prospects.

This invention discloses a non-contact yarn twisting motion analysis experimental platform based on machine vision, comprising a frame module, a yarn twisting device, and an optical observation module. The frame module is a three-dimensional rectangular aluminum profile frame, forming the main structure of the experimental platform. The yarn twisting device includes a base, a back plate, a rotating mechanism, a plying mechanism, and a take-up mechanism, and the speed of yarn twisting is controlled by a drive motor. The optical observation module includes an LED light, a high-speed camera, and a universal bracket, and is used to capture images of yarn motion within the yarn twisting area. This platform, through non-contact optical measurement, can accurately study the yarn twisting motion law, meeting the testing and analysis needs under different fiber types and spinning speeds, and providing reliable experimental basis for optimizing the twisting process, reducing production losses, and achieving mass production of high-quality yarn.

The utility model relates to the technical field of automobile part transfer equipment, in particular to an automobile skylight sliding rail transfer device. According to the technical scheme, the trolley comprises a trolley plate and further comprises a plurality of storage boxes connected to the upper surface of the trolley plate in a sliding mode, and each storage box is provided with a plurality of storage grooves; the identification mechanism is mounted on the vehicle plate to open or close the storage box; and the springback mechanism is arranged at the bottom of the storage box and is used for locking the identification mechanism in the opening or closing state. According to the automobile skylight sliding rail transfer device, the storage box, the storage groove, the identification mechanism, the springback mechanism and other structures are matched, sliding rails of different models can be clearly separated, workers can be helped to quickly find the sliding rails of the needed models, and the time for finding the sliding rails due to disorder is shortened. Smooth operation in the production process can be guaranteed by taking the sliding rail of the correct model, and the mechanical fault or the product quality problem caused by the wrong model is avoided.

The impurity removing device comprises a machine body, an impurity removing barrel is rotationally installed in the machine body, a feeding opening communicated with the impurity removing barrel is formed in the machine body, an air blowing and flower turning mechanism is arranged in the impurity removing barrel, an impurity removing net is arranged at the bottom of the impurity removing barrel, a dust removing opening is formed in the top of the impurity removing barrel, and the air blowing and flower turning mechanism is arranged in the dust removing barrel. And a dust collection mechanism covers the position, located above the dust removal opening, in the machine body, a discharging opening is formed in one side of the impurity removal barrel, a movable blocking door is hinged to the side, located at the upper end, of the discharging opening, and a material receiving drawer is detachably installed at the position, located below the impurity removal barrel, in the machine body. According to the jasmine flower impurity removing device, the blowing flower turning mechanism is arranged in the impurity removing barrel, the blowing flower turning mechanism turns jasmine flowers through airflow, mechanical extrusion and friction to the jasmine flowers are avoided, damage to the flowers is reduced, and impurities can be discharged from the impurity removing net at the bottom in the jasmine flower turning process.

This invention provides an aortic pre-fenestration branch guidewire guidance system, comprising a central catheter, a capture ring, and a sliding cannula. The capture ring is connected to the outer wall of the central catheter. The sliding cannula is coaxially sleeved on the outside of the central catheter and can slide along the axial direction of the central catheter. When the sliding cannula moves proximally, the capture ring is released from the constraint of the sliding cannula and unfolds radially outward of the central catheter, thereby forming a capture opening that can accommodate the target guidewire. When the sliding cannula moves distally, the sliding cannula radially compresses the capture ring in its unfolded state, forcing the capture ring to undergo radial compression deformation. The radial compression deformation of the capture ring reduces the cross-sectional area of ​​the portion surrounding the target guidewire, thereby clamping the target guidewire and improving the success rate.