31results about How to "Lightweight structure" patented technology

The invention discloses an integrated assembly type steel structure outer envelope system which comprises a steel structure body and further comprises two coamings located on the inner side and the outer side of the steel structure body respectively. The outer decorative plate is arranged on the surface of the surrounding plate on the outer side of the steel structure main body; the buffer layer is adhered to the surface of the coaming on the inner side of the steel structure main body; and the inner decorative plate is arranged on the side, away from the steel structure body, of the buffer layer. According to the integrated assembly type steel structure outer envelope system, the inner decorative plate, the outer decorative plate, the basic plate, the heat preservation cotton and the like are integrated together, and after the integrated assembly type steel structure outer envelope system is assembled on the steel structure body, integrity is high, the inner decorative plate and the outer decorative plate are not prone to falling off, and safety is good.

The application discloses a rice disease image segmentation method based on frequency domain modulation and topological constraint, which comprises the following steps: 1, frequency domain decomposition is carried out on rice disease image data to obtain amplitude spectrum and phase spectrum features; 2, a frequency domain adaptive modulation module is constructed to selectively enhance the frequency components of the structural key information; 3, the topological invariants of the image are extracted through a topological constraint module, and the reference topological structure is obtained by down-sampling the label to construct a topological consistency loss; 4, the topological consistency loss and the rice disease image segmentation loss are jointly optimized, the model training under multi-level structure constraint is realized, and a rice disease image segmentation model is constructed. The sensitivity of the model to the structure features of the rice disease lesion is enhanced through frequency domain modulation, and the morphological consistency of the segmentation result is maintained through topological constraint, so that the robustness of the model under natural conditions such as light change and background complexity difference is effectively improved, and the performance of the disease image segmentation in an open farmland scene is improved.

The invention relates to a high-precision photoelectric load servo stabilization system which is characterized in that an outer frame is connected with a carrier, and an inner frame is connected with a load supporting platform; the rotary biprism light beam pointing control module is installed on the load supporting platform and provides a light beam pointing adjusting function. The outer frame and the inner frame are connected through a passive vibration reduction and isolation array, and the passive vibration reduction and isolation array is composed of a plurality of sets of cross-shaped flexible parts which are symmetrically arranged, supports the inner frame and achieves passive high-frequency vibration isolation. The active vibration reduction and isolation array is connected between the outer frame and the inner frame through a coil component support and a permanent magnet component support, and the active vibration reduction and isolation array is composed of a plurality of sets of symmetrically-arranged voice coil motors and used for actively restraining six-degree-of-freedom low-frequency vibration of the inner frame. The system is used for providing a stable working environment and a light beam pointing control function for a photoelectric load carried on a carrier, and has the advantages of being good in vibration reduction and isolation effect, low in friction resistance, high in space utilization rate and good in light beam pointing control dynamic performance.

The present invention relates to a concrete axial tension self-balancing test device in the field of concrete testing technology, including a vertical tension test mechanism and a horizontal tension test mechanism; the vertical tension test mechanism includes a reinforcement plate 1, a reinforcement plate 2, a reinforcement plate 3 and a reinforcement plate 4, and the pressure is converted into tension through a jack 1, and the horizontal tension test mechanism includes reinforcement plates 5, 6, 7, 8 and 9, and the pressure is converted into tension through a jack 2. During the test, the concrete specimen is respectively bonded to the reinforcement plate 2, the reinforcement plate 1, the reinforcement plate 6 and the reinforcement plate 7 through epoxy resin glue. By applying force in two directions at the same time, the tensile strength of the concrete component when it is simultaneously subjected to force in two directions can be more accurately tested. The concrete specimen can be self-balanced when subjected to tension, is not prone to overload, and the test result is more accurate.

The invention relates to a heat exchanger of a liquid rocket engine, in particular to a wall surface integrated type 3D printing efficient heat exchange barrel with a water-drop-like section flow channel, and aims to solve the problems that an independent external heat exchanger and a pipeline thereof in an existing liquid rocket engine are complex, so that the requirement for compactness of an engine system is difficult to meet; and the complex pipeline increases the flow resistance of the liquid medium and affects the heating efficiency of the heat exchanger and the overall performance of the engine system. According to the wall surface integrated type 3D printing efficient heat exchange barrel with the water-drop-shaped section flow channel, a heat exchanger is integrated into the wall surface of a high-temperature gas pipeline, a pressurizing medium in a storage box is introduced into a second flow channel for heating, and then the pressurizing medium is introduced into the storage box to complete pressurizing; and compared with an independent external heat exchange scheme, the occupied volume and mass are greatly reduced, the thrust-mass ratio of the engine is increased, and the saved weight can be used for increasing the effective load.

The invention discloses a large-caliber rib column tensioning type deployable antenna mechanism, relates to a deployable antenna, and aims to solve the problems that an existing tensioning type antenna mechanism is lack of a large-scale deploying mechanism at present, and a large-caliber antenna deploying structure is large in mass and low in rigidity, the large-caliber rib column tensioning type deployable antenna mechanism comprises a telescopic stand column, a plurality of rib units and a motor lead screw speed control unit, the motor lead screw control unit is installed in the middle of the telescopic stand column, the multiple rib units are evenly distributed in the circumferential direction, and the root of each rib unit is connected with the motor lead screw control unit. By adopting the forked design at the tail ends of the ribs, the length of the tension cable at the outermost ring is reduced, so that the suspension depth of the cable is reduced, the effective aperture of a larger antenna can be obtained under the condition that the number of the ribs is small, and the structural mass is lighter due to the small number of the ribs. Through the design of the three circles of crossed tensioning cables between the adjacent ribs, the telescopic stand column in the center and the tensioning cables at the tail ends of the ribs, the structure is tensioned into a whole, and the rigidity of the structure can be improved. The invention belongs to the technical field of aerospace engineering.

The invention relates to the field of photovoltaic technology, and discloses a photovoltaic power station power prediction method and device, computer equipment and a storage medium, and the method comprises the steps: obtaining the operation data and environment data of a photovoltaic power station; calculating a target attenuation coefficient of the photovoltaic power station according to the operation data and the environment data; and correcting an initial power predicted value of the photovoltaic power station based on the target attenuation coefficient to obtain a target power predicted value, the initial power predicted value being determined according to meteorological data of the photovoltaic power station. The method solves the problems that in the prior art, the interaction effect between photovoltaic panel aging and dust deposition is not considered, and due to the fact that a complex model or newly-added hardware is depended on, the power prediction precision of an old photovoltaic power station is low, and the applicability is poor.

The invention discloses a bearing fault identification method based on multi-scale space-time synchronization attention and space-time alignment. The method comprises the following steps: carrying out sliding window segmentation and normalization preprocessing on an original vibration signal; constructing an adjacent matrix by using a K-nearest neighbor algorithm, and extracting local spatial features by using a graph convolutional neural network; bidirectional sequence features are extracted through a bidirectional gating loop unit network, and weighted fusion is carried out in combination with a global attention mechanism; and after space and time sequence features are spliced, fault prediction is realized through adaptive average pooling and a full-connection classifier. According to the method, graph modeling, GCN, BiGRU and an attention mechanism are fused, cooperative extraction of space-time double-path features is realized, the problems of weak space modeling and lack of time sequence dependence in a traditional method are effectively solved, and the bearing fault recognition precision and generalization ability in a multi-working-condition and strong-noise environment are remarkably improved.

The utility model discloses a kind of rotating devices, belong to X-ray automatic detection equipment technical field, specifically related to a kind of high-precision X-ray source intelligent rotating device, comprising: driving motor, installation bottom plate, hollow rotating platform and X-ray source assembly;The driving motor is installed in the rear side of the installation bottom plate, the hollow rotating platform is installed in the front side of the installation bottom plate, and the X-ray source assembly is installed on the hollow rotating platform;Arranged on the installation bottom plate is in-place inductor and limit block;The X-ray source assembly is provided with the inductive sheet matched with the in-place inductor;The utility model uses hollow rotating platform as core rotating element, and is directly driven by motor, and this design reduces the generation of cumulative error from the root, ensures the high-precision rotating performance;And simplify overall structure, under the premise of guaranteeing function, reduce volume, weight and cost, show significant technical advantage.

The invention discloses a web version train number drawing method, system and device and a medium, and the method comprises the steps: dividing a drawing area into continuous subareas, determining a corresponding initial graph area according to the text attribute of a target train number when the target train number is drawn or updated, and determining an initial subarea occupied by the initial graph area; indexing the graphic area coordinate information of other train numbers stored in the initial partition through a cache structure, and carrying out collision detection on the coordinate information of the initial graphic area and the graphic area coordinate information of other train numbers; under the condition that collision is detected, selecting a candidate graphic area without collision from the generated candidate graphic areas, and determining the selected candidate graphic area as a final drawing area; and drawing the target train number in the final drawing area, and updating the cache structure. The calculation process of collision detection is effectively reduced, the problem of overlapping and shielding of train numbers is solved, and the visual definition of a working diagram is improved.

The application discloses a Jerusalem unit double-layer FSS broadband wave-absorbing structure and a preparation method and application thereof, and belongs to the field of electromagnetic wave-absorbing technology design in electromagnetic stealth technology. The structure is sequentially arranged from bottom to top as a metal bottom layer, a dielectric layer 1, a patterned resistance layer 1, a dielectric layer 2 and a patterned resistance layer 2. Periodic array distributed multiple unit cell structures are formed on the surfaces of the patterned resistance layer 1 and the patterned resistance layer 2, and each unit cell structure adopts a Jerusalem cross pattern. The Jerusalem unit double-layer FSS broadband wave-absorbing structure provided by the application has a wide-frequency absorption characteristic. Through the regulation of geometric sizes on a macro scale and the structure design on a micro scale, the wave-absorbing structure can realize an absorption rate of more than 99% in a full frequency band of 8-12 GHz, and has a good absorption effect on low-frequency electromagnetic waves.

The invention provides a compact quick unfolding and locking mechanism for an air rudder, which comprises a control surface, a rudder fork and an unfolding and locking mechanism, a control surface rotating shaft hole and a rudder fork rotating shaft hole are correspondingly formed in the control surface and the rudder fork, and the unfolding and locking mechanism comprises a torsion spring and a locking device; the two ends of the torsion spring are connected with the control surface and the rudder fork in a fastening mode respectively, and when the control surface is in a folded state, the torsion spring is provided with a pre-torsion angle for providing unfolding torque; the locking device comprises a compression spring and a locking block, a clamping groove is formed in the hole wall of the control surface rotating shaft hole, and when the control surface is in an unfolded state, the locking block is inserted into the control surface rotating shaft hole and abuts against the clamping groove of the control surface rotating shaft hole. The air rudder unfolding torque is provided through the torsion spring, and the positioning and locking effects of the rudder surface and the rudder fork after the air rudder is unfolded are achieved through the locking spring and the compression spring; and by adopting an unfolding and locking integrated structure, the space volume can be reduced, the structural mass can be reduced, and the problem of uneven stress can be effectively solved.

The utility model discloses an agricultural transport trailer carriage, which aims at solving the problems that the existing agricultural carriage is heavy in weight, poor in reliability and high in manufacturing cost, the upper ends of two end frames are rigidly connected through a left upper longitudinal beam and a right upper longitudinal beam to form a carriage body frame, and the two ends of two lower inclined panels are respectively connected with a front vertical plate and a rear vertical plate. The two lower inclined panels, the two side vertical plates, the front vertical plate and the rear vertical plate form a carriage body, inclined surface rib beams are arranged at the two ends of the outer side faces of the two lower inclined panels and fixedly connected with inclined beams of the front end frame and the rear end frame respectively, inclined surface rib beams are arranged on the outer side faces of the two lower inclined panels at equal intervals, inclined surface straining beams are horizontally arranged on the outer side faces of the two lower inclined panels, and inclined surface straining beams are arranged on the outer side faces of the two lower inclined panels. The two ends of the two inclined plane straining beams abut against the two adjacent inclined plane rib beams in the middle, and transverse straining beams are arranged on the left upper longitudinal beam and the right upper longitudinal beam and are designed to be in an upper arch arc shape. The utility model is suitable for the installation and use of agricultural transport trailers.

The present application relates to whip antenna technical field, specifically to carbon fiber whip antenna structure and forming method. The existing carbon fiber whip antenna conduction performance is poor, the resistance value is large, the radiation efficiency is low. The carbon fiber whip antenna structure includes first metal joint, carbon fiber tube and second metal joint and the conductive wire connecting two metal joints. Its forming method is that the first metal joint and the second metal joint are installed at both ends of the mold; carbon fiber prepreg is laid; the conductive wire is wound; carbon fiber prepreg is laid again; the antenna outer surface is wrapped with metal mesh; the metal mesh is wound and fixed with the conductive wire; the connecting part of the metal mesh and the first metal joint and the second metal joint is wound with carbon fiber prepreg respectively; compaction and solidification; demolding. The carbon fiber whip antenna has good conduction performance, small resistance value, high resistance radiation efficiency, light structure quality, excellent mechanical properties, fatigue resistance, corrosion resistance, large power bearing, high radiation efficiency, long service life, high efficiency of the workpiece.

This invention discloses an onboard multi-sensor active-passive collaborative stabilization device and method, relating to the field of stability control technology for autonomous vehicle perception systems. The device includes a vehicle mounting base, a passive vibration isolation module, an active compensation module, a multi-sensor common reference support platform, an attitude and vibration sensing module, and a collaborative control module. The passive vibration isolation module attenuates mid-to-high frequency vibrations and impact loads transmitted from the vehicle body to the support platform. The active compensation module compensates for the pitch, roll, and / or yaw attitudes of the support platform in real time. The collaborative control module preprocesses disturbance information, identifies disturbances, divides frequency bands, and allocates control, ensuring that low-frequency attitude disturbances are compensated by the active compensation module, mid-to-high frequency vibrations are attenuated by the passive vibration isolation module, and outputs stabilized multi-sensor data and / or residual attitude information. This invention improves the installation stability and relative pose stability of multiple sensors such as cameras, lidar, and IMUs during vehicle operation, reduces image blurring, point cloud distortion, and attitude drift, and enhances the stability and accuracy of multi-sensor fusion perception, localization mapping, and autonomous driving systems.

The application discloses a gas nozzle adjusting device and method for a solid rail control engine, and the gas nozzle adjusting device is used to adjust the angle of the gas nozzle based on the engine cabin body, improve the position precision of the thrust axis of the rail control engine, and realize the accurate control of the rail control engine. The structure comprises a nozzle, a connecting flange, a base, a spherical column, an end cover, a positioning tool, a positioning core rod, a cabin body, an O-shaped ring, a fastening screw, a fixing screw and a positioning pin. The layout form is shown in the drawings, the nozzle of the rail control engine is fixed with the connecting flange through threads, the positioning tool is positioned with the cabin body through two positioning pins, two fixing screws are used for fixing, the positioning tool and the positioning core rod ensure that the angle of the gas nozzle is adjusted in place, and the connecting flange, the base and the end cover are fixed with the spherical column through the fastening screw.

The utility model relates to the technical field of power transmission, and discloses an aluminum alloy bus duct shell, which comprises a first side plate, a second side plate, a first cover plate and a second cover plate, the first side plate and the second side plate are C-shaped plates, the first side plate and the second side plate are oppositely arranged, a gap is arranged between the first side plate and the second side plate, a first heat dissipation part is arranged outside the first side plate, and a second heat dissipation part is arranged outside the second side plate. A first heat dissipation part is arranged on the outer side of the first side plate, a second heat dissipation part is arranged on the outer side of the second side plate, the first cover plate is connected with one end of the first side plate and one end of the second side plate, the first cover plate is an I-shaped plate and comprises a first vertical plate, a first horizontal plate and a second vertical plate which are sequentially connected, and a first supporting plate is arranged on the outer side surface of the first horizontal plate; the second cover plate is connected with the other end of the first side plate and the other end of the second side plate, the second cover plate is an I-shaped plate, the second cover plate comprises a third vertical plate, a second horizontal plate and a fourth vertical plate which are connected in sequence, and a second supporting plate is arranged on the outer side surface of the second horizontal plate. The LED lamp is high in supporting capacity, not prone to deformation, even in heat dissipation and light in weight.

The utility model relates to the technical field of traffic facilities, and discloses a traffic isolation guardrail which comprises a plurality of connecting knots detachably and fixedly arranged on a road at intervals, protective plates detachably and fixedly installed on the two sides of the connecting knots and used for connecting every two adjacent connecting knots, and end columns fixedly arranged at the ends of the multiple mutually-connected protective plates. The bottoms of the end columns are detachably and fixedly connected with a road. A brand-new frame skin structure is adopted, the stability and safety of the guardrail can be considered at the same time, and meanwhile the overall structure is light in weight and convenient to transport; during installation, different structural parts are firmly connected through the fasteners, so that the overall stability and external force resistance of the guardrail are high.

The application provides a turbine disc ultra-light topology optimization method considering equal strength targets, which comprises the following steps: discretizing a turbine disc design domain and setting design variables, obtaining unit physical density through density filtering and Heaviside mapping, establishing a finite element model to solve structure displacement and von Mises stress, calculating enhanced stress standard deviation, dispersion factor and mass fraction after von Mises stress punishment, constructing an aggregate objective function and an approximate maximum stress constraint, performing sensitivity analysis and updating design variables, and iteratively obtaining a turbine disc topology configuration. The method can improve the stress utilization degree of the bearing material region while meeting the strength constraint.

The application belongs to the technical field of computer vision, and particularly relates to an image semantic segmentation method based on dynamic fusion and context perception, comprising the following steps: inputting an input image into a lightweight multi-scale feature extraction backbone network to output shallow, middle and deep layer features; inputting the shallow, middle and deep layer features into an MRFM module to output first, second and third enhanced semantic features; inputting the third enhanced semantic feature into an LACP to output an enhanced context feature; inputting the first, second enhanced semantic features and the enhanced context feature into a DWFM to output a fusion feature; inputting the enhanced context feature into a double-branch prediction structure to output a final segmentation prediction map; constructing a joint loss function to perform end-to-end training and optimization on the network formed by steps S1 to S5; and solving the problems of rigid fusion strategy, weak context perception capability and model parameter redundancy in the existing image semantic segmentation method.

The application relates to a combined air unit frame connecting structure, which comprises a plurality of frame rods, reinforcing rods, corner connecting pieces for connecting the frame rods and intermediate connecting pieces for connecting the frame rods and the reinforcing rods; the corner connecting piece comprises a bearing base, a first plug connected to the bearing base and used for transversely connecting the frame rods and a second plug used for longitudinally connecting the frame rods; outward first convex structures are arranged on two mutually-perpendicular side walls of the second plug; the intermediate connecting piece comprises a connecting plate and a plug-in block arranged on the connecting plate, the connecting plate is fixed on the frame rod, and the plug-in block is used for plugging in the reinforcing rod; the plug-in block has at least one partially concave side wall. The modular connecting structure designed in the application has high assembly efficiency, light structure quality, high connecting rigidity and is suitable for application places with large air volume and high static pressure.

The embodiment of the invention provides a multi-node UWB relative positioning method and system based on a liquid neural network. The method comprises the steps that observation data between known node pairs are collected in real time through UWB; obtaining a multi-frame time sequence feature sequence corresponding to a moment based on observation data between known node pairs acquired in real time; inputting the multi-frame time sequence feature sequence into a liquid neural network model based on an ordinary differential equation, and outputting a prediction distance result between known node pairs; based on the real distance result and the predicted distance result, optimizing the liquid neural network model by using a loss function to obtain a trained liquid neural network model; using the trained liquid neural network model to obtain a prediction distance result between the unknown node pairs; and obtaining the relative position of the unknown node at the current moment based on the predicted distance result between the unknown node pairs and the relative position of the unknown node at the previous moment. The method can give consideration to the real-time performance and robustness of positioning.

The invention discloses a multivariate time series deep federation anomaly detection method and system, and the method comprises the steps: carrying out the local feature coding and normal behavior paradigm learning at an edge device, constructing a local paradigm set, only uploading an embedded network parameter and a paradigm module to a central server, and achieving the collaborative modeling under a data localization processing condition; the central server executes federal optimization aggregation on model parameters uploaded by multiple devices, performs clustering alignment on local examples, generates a global embedded model and a global example set, and then synchronizes the global embedded model and the global example set to each edge device for iterative optimization; according to the method, a unified anomaly judgment mechanism based on cosine similarity is adopted, so that the deviation degree of the to-be-detected sample and the paradigm feature is taken as an anomaly score, and accurate recognition of unknown anomaly and fine anomaly is realized. According to the method, original time sequence data does not need to be transmitted, the communication overhead can be remarkably reduced, the privacy protection capability is enhanced, and the method has the adaptive capability to multiple types of equipment and dynamic environment changes.

The invention discloses a deep learning-based SAR (Synthetic Aperture Radar) and visible light remote sensing image fusion method. An adopted fusion model comprises a feature extraction part, a fusion part and an image reconstruction part. An overall loss function used for training the fusion model at least comprises similarity loss and brightness distribution loss; for similarity loss, each modal feature is extracted by using a preprocessing model, and the retention degree of important information in visible light and SAR images is quantified by using entropy and standard deviation calculation; according to the brightness distribution loss, the feature correlation is measured by using a Gram matrix, and then the inconsistency degree of the fusion result image and the original SAR image in feature distribution is obtained. According to the method, complementation of different resolution characteristics is realized, effective combination of reflection intensity information in an SAR image and detail information in a visible light image is ensured, SAR information in a fusion result can be highlighted, key characteristics are reserved, and visual quality and information integrity are improved.

The invention discloses a rotor head structure of a single-rotor flybarless unmanned helicopter, belonging to the technical field of unmanned aerial vehicles, and comprises a rotor seat, a rotor blade clamp assembly and a flapping damper. The rotor seat is located below the rotor blade clamp assembly, the flapping damper is located in the middle of the rotor seat, the front end surface of the rotor blade clamp assembly is provided with three evenly distributed transverse holes, the middle parts of the three transverse holes are provided with a pull button piece structure, the rotor blade clamp assembly comprises two blade clamps, a rotor transverse axis is provided between the two blade clamps, bearings are provided on the left and right sides of the rotor transverse axis, pull button pieces are fixedly connected on the left and right sides of the rotor transverse axis, a bearing spacer is provided on the inner side wall of the bearing, and a pressure cover is provided above the rotor transverse axis. The rotor structure is simplified in form, the number of parts is reduced, the structural weight is reduced, the structural parts can operate flexibly and stably with each other, and in addition to meeting the functions required for flight, the rigidity and weight of the parts are in a good state.

The invention discloses an extremely few sample remote sensing scene classification method based on dynamic sparse feature enhancement. The method comprises the following steps: acquiring high-resolution remote sensing image data; extracting multilayer features of the image data through a trunk convolutional neural network; performing adaptive sparsification processing on the features extracted by the trunk convolutional neural network to obtain sparse features; carrying out confidence weighted fusion on the sparse features to obtain enhanced features; and performing classification based on the enhanced features, and outputting a scene category and a confidence result of the remote sensing image. According to the method, a dynamic sparse mapping and uncertainty perception feature fusion mechanism in a deep learning network is utilized to realize adaptive feature extraction and confidence coefficient weighted classification of high-resolution remote sensing images, and a high-precision and high-robustness classification result can be obtained under the condition of extremely few labeled samples; and carrying out scene category judgment and result output on the purified key representation. The remote sensing scene classification method is suitable for the condition of extremely few sample supervision.

The invention discloses a double-side controllable deformation single-degree-of-freedom multi-joint mechanism, and belongs to the technical field of underwater detection equipment, the double-side controllable deformation single-degree-of-freedom multi-joint mechanism comprises N joint units connected in sequence, and a degree-of-freedom adjusting rod is connected between the adjacent joint units; the joint unit comprises a swing rod, a frame rod, a crank connecting rod and a sliding block and forms a plane connecting rod mechanism. The swing rod is connected with the front end of the frame rod through a first pin shaft, the other end of the frame rod is connected with one end of the crank connecting rod through a second pin shaft, the sliding block is assembled on the swing rod and forms a linear moving pair moving along the swing rod, and the other end of the crank connecting rod is connected with the sliding block through a third pin shaft. The rear end of the swing rod is fixedly connected with the front end of the swing rod in the rear adjacent joint unit; the two ends of the freedom degree adjusting rod are connected with the third pin shafts in the two joint units correspondingly. The multi-joint mechanism has the advantages that the number of driving units is small, control is easy, the track is accurate, the structure is light, reliability is high, bearing capacity is high, motion characteristics are adjustable, and the position of a driving link is flexibly selected.

The invention relates to the field of sealing structures, in particular to a short-stroke high-reliability reusable sealing structure which comprises a male head, a female head, a connecting sleeve, an inner side sealing ring and an outer side sealing ring. A butt-joint cavity is formed in the pipe wall of the butt-joint section of the female head, an opening of the butt-joint cavity is located in the butt-joint end face of the female head, and the butt-joint section of the male head is inserted into the butt-joint cavity. The inner side sealing ring and the outer side sealing ring are located in the butt joint cavity, the inner side sealing ring is located between the inner wall face of the butt joint section of the male head and the inner side inner wall face of the butt joint cavity, and the outer side sealing ring is located between the outer wall face of the butt joint section of the male head and the outer side inner wall face of the butt joint cavity; the connecting sleeve is provided with an assembling channel penetrating through the two ends, the exposed portion of the butt joint section of the male head and the butt joint section of the female head are both located in the assembling channel, the positioning end of the connecting sleeve is connected with the rear end face of the butt joint section of the male head in a clamped mode, and the connecting sleeve is detachably connected with the connecting section of the female head. The sealing effect can be improved, and the sealing structure can adapt to multiple times of insertion and extraction so that the sealing structure can be repeatedly used.

The slope excavation supporting device for the water conservancy project comprises a retaining wall, blocking mechanisms and a plurality of sand filling grooves formed in the top end of the retaining wall, the multiple sets of blocking mechanisms are arranged at the bottom of the retaining wall in an arrayed mode, and the multiple sets of blocking mechanisms are used for sand discharging and blocking of the multiple sand filling grooves respectively; the top supporting structure is arranged at the bottom of the retaining wall and used for supporting the bottom of the retaining wall in an abutting mode. A plurality of through openings are formed in the middle of the retaining wall, and blocking mechanisms are detachably installed at the through openings and used for blocking the through openings. The retaining wall is provided with the through hole and the sand filling groove, so that the volume structure of the retaining wall is reduced, the prefabricated retaining wall structure is lighter in weight, the retaining wall is more convenient to transfer, and meanwhile, the blocking mechanism which can be detachably mounted is additionally arranged, so that the blocking mechanism can be additionally arranged according to actual support requirements; and the retaining wall is arranged more flexibly.

The invention discloses a connecting piece vibration and noise reduction method and device based on a vibration absorption superstructure, and the method comprises the steps: analyzing the vibration condition of a connecting piece between a vibration source and other parts in a vibration system, then carrying out the design of a vibration reduction structure according to the demands, and embedding a proper vibration absorption superstructure in the connecting piece, thereby achieving the vibration reduction of the connecting piece. And the band gap interval of the vibration absorption superstructure covers the target vibration reduction rate. And according to the configuration of the joint of the connecting piece, the metal rubber vibration isolation pad is designed and arranged, and vibration energy is secondarily dissipated. According to the design method, the vibration direction, the transmission path and the vibration frequency are comprehensively evaluated, and the customized vibration absorption superstructure is used for low-frequency vibration reduction, so that efficient vibration suppression of actual equipment can be realized. The low-frequency broadband vibration and noise reduction device has higher engineering equipment practicability and vibration and noise reduction capacity, and can be applied to low-frequency broadband vibration and noise reduction of mechanical equipment with connecting pieces between various main system vibration sources with cylinder equipment as a typical body and other parts.