111results about How to "Achieve precise positioning" patented technology

The application discloses a group positioning method, device and communication equipment, and belongs to the technical field of wireless communication. The group positioning method comprises the following steps: a first communication equipment acquires position-related information of each communication equipment in a positioning group and a first propagation time delay difference quantity; and the first communication equipment determines target position information of a target reflector according to the position-related information and the first propagation time delay difference quantity. The positioning group comprises M communication equipments including the first communication equipment, the number of the first propagation time delay difference quantity is N, one first propagation time delay difference quantity is a propagation time delay difference quantity of a propagation path between any two communication equipments in the positioning group, the propagation path is a path reflected by the target reflector, different first propagation time delay difference quantities correspond to two communication equipments in the positioning group, and the two communication equipments are not completely the same. N and M are positive integers, and M is greater than or equal to N and N is greater than or equal to 3.

A simulation method and related equipment for machining process training are disclosed. The method includes: acquiring engineering data and process data of the target workpiece; extracting features from the engineering data and combining them with the process data to construct a case resource library; performing semantic association analysis between the pre-set knowledge resource library and the machining cases in the case resource library to generate a process knowledge network; constructing a virtual training environment based on the process knowledge network; collecting interaction data of learners in the virtual training environment and evaluating the interaction data to obtain evaluation results; and generating guidance animations based on the evaluation results and the process knowledge network. This application can improve the learning efficiency of simulation training.

The utility model discloses a tray positioning tool of special-shaped plate material, including tray base and tray panel, and the tray base includes a plurality of tray support feet set in the corner, and the lifting lug for hoisting is set on each tray support foot, and a plurality of positioning adjusting rods are set on the tray panel, the tray panel includes outer frame and inner frame, and the outer frame includes two groups of outer horizontal connecting rods and outer longitudinal connecting rods that are connected head to tail in proper order, and the inner frame includes a plurality of longitudinal inner rods and horizontal inner rods, and each positioning adjusting rod is movably clamped on the longitudinal inner rod and the horizontal inner rod, a movable support part is arranged at the bottom of outer frame and inner frame, a plurality of jack insertion jacks for forklift are arranged on the movable support part, and a protective plate is arranged on the circumference of outer frame, and the utility model aims at solving the problem that the existing tray can only be suitable for the same shape plate, and needs a plurality of types of trays to adapt to different shape plates, and reduces the overall process efficiency.

This invention relates to the field of resource and environmental technology, specifically to a CFD simulation method for detecting marine foreign objects based on muon imaging. The method includes: collecting muon flux and scattering angle data by deploying a three-dimensional detection network on the sea surface and seabed; inverting the three-dimensional density field of the target sea area by combining environmental parameters to identify density anomaly regions; constructing a CFD three-dimensional flow field simulation model based on marine geographic and topographic data, using the inverted density field as initial and boundary conditions, and setting fluid parameters and turbulence models; initiating CFD simulation to simulate fluid transport and foreign object diffusion processes, and iteratively coupling the measured muon density field with the simulated density field until the deviation converges, achieving precise synchronization between the density field and the flow field; fusing density anomaly characteristics and flow field distribution to accurately locate the foreign object, identify its type, predict its trajectory and evolution trend, and generate early warning information. This invention achieves efficient, accurate detection and dynamic monitoring of marine foreign objects.

The application discloses a precise intelligent agricultural greenhouse control system based on Zigbee transmission technology and relates to the technical field of intelligent agricultural greenhouse environment control. The system continuously monitors leaf surface temperature, air temperature and humidity and breeze speed, identifies local dewing risks by combining the change track of the leaf surface temperature to the dew point temperature and the influence of the breeze speed on the leaf surface air boundary layer, constructs link congestion states by combining the node retransmission times and the cache queue occupation amount, and realizes the priority scheduling of the control instruction and the environment data transmission. In the case that the dewing risk is increased and the link is congested, the anti-dewing control instruction is preferentially issued to the local microcirculation fan and the top ventilation window, and the non-key sensing node report is dynamically suspended, so that the high precision, real-time performance and spatial positioning of the anti-dewing control are realized. The application can prevent the local low wind speed area from dewing in advance, improves the yield and quality of the greenhouse crops, and effectively reduces the local disease risk.

The application discloses a cigarette case intaglio printing surface quality evaluation method and system based on image features, and relates to the fields of cigarette case intaglio printing quality detection and machine vision technology; the application collects cigarette case intaglio printing images through an image acquisition unit and pre-processes the images into gray-scale images, extracts multi-scale gradient features to obtain a comprehensive feature index for preliminary defect determination, analyzes edge morphology and texture periodicity in a transition area to obtain a comprehensive defect discrimination index, obtains a defect score based on the multi-scale comprehensive feature index and the comprehensive defect discrimination index, and completes defect classification and positioning through spatial clustering and secondary verification; four quality grades are divided based on defect proportions and defect numbers, a defect labeling map, a heat map and a standardized quality evaluation report are generated, and the problem that extracted image features cannot effectively distinguish normal dots from defective dots and result in a high false detection rate is effectively solved, and the precision and efficiency of cigarette case intaglio printing surface defect detection are significantly improved.

The cyanobacterial bloom salvaging device comprises a rubber boat, the top of the rubber boat is fixedly connected with a sewage collecting pool, the rear side of the sewage collecting pool is fixedly connected with a lifting mechanism, the top of the front side of the lifting mechanism is fixedly connected with an air flotation machine, and the air flotation machine is fixedly connected with a water outlet of the air flotation machine. A slag scraping plate is fixedly connected to the top of the air flotation machine, a shovel plate is fixedly connected to the front side of the top of the sewage collection tank, a traction rope roller is arranged in the middle of the top of the rear side of the sewage collection tank, and a positioning mechanism is fixedly connected to the middle of the rear side of the sewage collection tank; by arranging the rubber boat, the sewage collection tank, the air flotation machine, the slag scraping plate, the shovel plate, the traction rope roller and the positioning mechanism, efficient salvage and collection of cyanobacterial blooms are achieved; an operator only needs to float the whole device on the surface of a water pool through a rubber boat, and cyanobacterial blooms are conveyed into a sewage collection pool through a shovel plate and separated through an air flotation machine.

The utility model discloses a double-tool-turret lathe capable of machining different parts of a workpiece, and relates to the technical field of numerical control machining equipment. The device comprises a rack and a workbench fixed to the upper side of the rack, a first main shaft mechanism, a first X-axis conveying mechanism located on one side of the first main shaft mechanism and two second X-axis conveying mechanisms located on one side of the first X-axis conveying mechanism are arranged on the workbench, a second main shaft mechanism is arranged on the first X-axis conveying mechanism, and the second main shaft mechanism is arranged on the second X-axis conveying mechanism. And a tool turret mechanism is arranged on the second X-axis conveying mechanism. Through the arrangement of the first main shaft mechanism, the second main shaft mechanism and the double-tool-turret mechanism, the multi-process automatic machining of different parts of a workpiece can be realized by matching with the movement control of the second X-axis conveying mechanism and the Y-axis conveying mechanism, the problems of workpiece displacement, vibration, frequent shutdown adjustment and the like caused by the clamping limitation of a single main shaft of the lathe are reduced, and the machining efficiency is improved. And the production efficiency of processing is effectively improved.

The invention relates to the technical field of semiconductors or photovoltaics, in particular to feeding equipment, a feeding method and a battery piece passivation process system, and aims to reduce the site requirement of the process system. The feeding equipment comprises a bearing frame, a positioning frame and an AGV, the positioning frame is provided with a first channel, a floating platform and a plurality of positioning pieces, the floating platform is used for supporting the bearing frame, each positioning piece is arranged corresponding to at least one positioning part, and the positioning pieces are used for being in positioning fit with the corresponding positioning parts so as to limit the position of the bearing frame on the positioning frame; the AGV is used for transporting the bearing frame to the positioning frame, and the AGV enters and exits the positioning frame through the first channel. According to the feeding equipment provided by the embodiment of the invention, a site for loading the flaky materials can be separated from a site for carrying out process processing on the flaky materials, and the site requirement on a process system is reduced.

The utility model provides a distributed communication relay device for an unmanned target vehicle cluster, which comprises a main control cabin body, a communication module cabin and a power supply cabin, the communication module cabin is detachably connected above the main control cabin body, and the power supply cabin is detachably connected below the main control cabin body; a main control circuit board is arranged in the main control cabin body, and a power interface is arranged on the right side surface of the main control cabin body; a laser communication unit is fixed in the middle of the top of the communication module cabin, and a radio unit is arranged in the communication module cabin; lithium battery packs connected in parallel are arranged in the power supply cabin, a charging interface and a power connector assembly are arranged on the right side face of the power supply cabin, and the power connector assembly is connected with a power interface of the master control cabin body in a pluggable mode. According to the utility model, a split type detachable structure is adopted to reduce the size of the device, rapid deployment and maneuvering guarantee are facilitated, complementary communication guarantee is formed for an unmanned target vehicle cluster by adopting the directional laser communication unit and the radio unit, and the device is particularly suitable for unmanned cluster combat requirements under field operation conditions.

This application relates to the field of escalator technology, and in particular to an escalator step missing detection device, including an escalator body, escalator steps arranged on the inner side of the escalator body, and a fixed inner cavity opened on the inner side of the escalator body. A fixed box is fixedly connected to the inner side of the fixed inner cavity near the side of the escalator step. Through several sets of guide holes, sliding bases and corresponding auxiliary rollers arranged at equal intervals on the outer side of the fixed box, detection can be performed simultaneously at multiple different positions of the escalator steps, with a wide coverage range, effectively avoiding omissions in single-point detection, and improving the comprehensiveness and accuracy of step missing detection. Each set of sliding bases, conductive springs and conductive contacts independently corresponds to a specific step position. When a step is missing, only the conductive spring at the corresponding position contacts and conducts electricity, thereby triggering different states of the alarm light, realizing the precise location of the missing step, facilitating rapid troubleshooting and maintenance.

The invention discloses a high-toughness flame-retardant cable protection tube and a preparation method thereof, and the preparation method comprises the following steps: S1, carrying out melt blending and dynamic vulcanization reaction on a mixture containing bimodal distribution high-density polyethylene, a polyolefin elastomer with a double long branch chain structure and a dynamic cross-linking agent at a first temperature interval and first shear strength, a pre-crosslinked base material is obtained; s2, cooling the pre-crosslinked base material to an interface anchoring temperature interval, adding the composite fiber system, and carrying out first-stage melt blending under medium shear strength; s3, heating the mixture obtained in the step S2 to a second temperature interval, increasing the temperature to second shear strength, carrying out second-stage high-shear melt blending, and adding a halogen-free intumescent flame-retardant system and a multi-walled carbon nanotube at the same time; and S4, orientation locking and gradient forming. The polyolefin elastomer with a double-long-branch-chain structure is introduced, and a step-by-step process is adopted, so that the low-temperature impact strength, the toughness and the flame-retardant grade of the material can be remarkably improved.

The present application relates to the field of space in-orbit close-range relative visual navigation technology, and particularly relates to a space target visual measurement method combined with acceleration drift estimation, a tracking spacecraft is provided with an acceleration sensor and a camera, S1: obtaining initial relative position information and relative velocity information through a measurement system, S2: obtaining acceleration values and space target images in real time; S3: establishing a relative motion equation, substituting the obtained acceleration values and the relative position and relative velocity information at the previous moment into the relative motion equation to calculate position information; S4: calculating an error amount, and estimating the errors of the relative position information, the relative velocity information and the acceleration values in the dynamic equation through a filtering algorithm according to the error amount to correct the calculation results obtained in the dynamic equation, so that accurate positioning of a target spacecraft can be realized.

The utility model relates to a kind of special-shaped copper contact milling tool, belong to low-voltage electrical apparatus processing technical field, including bottom plate, the bottom plate is equipped with several special-shaped copper contacts located at the front end of bottom plate, the rear end of special-shaped copper contact is equipped with with bottom plate and is inserted into the positioning block of bottom plate, the rear end of bottom plate is equipped with the pressure plate for the crimping limit of special-shaped copper contact, the front end of special-shaped copper contact is equipped with with bottom plate and is inserted into the floating rod of bottom plate, the lower part of bottom plate is equipped with with floating rod and is threadedly connected self-locking nut.With compact structure, easy operation and good effect characteristics.Solve the accurate positioning, reliable clamping and prevent deformation problem of special-shaped, small, easily deformed copper parts during processing.

The invention discloses an aircraft landing method and system and a storage medium, and the method comprises the steps: receiving an aircraft landing instruction, and controlling a visual recognition module to determine an idle target parking apron within a preset range below an aircraft; controlling a visual identification module to identify a visual positioning identifier on the target parking apron so as to determine a first pose of the aircraft relative to the target parking apron; controlling a radar identification module to identify a radar positioning identifier on the target parking apron so as to determine a second pose of the aircraft relative to the target parking apron; and a fusion pose is determined according to the first pose and the second pose, and the aircraft is controlled to land on the target parking apron according to the fusion pose. According to the invention, the accuracy of positioning between the aircraft and the target parking apron is improved, and then the safety of the aircraft during automatic landing is improved.

The utility model provides a kind of prefabricated leakage orifice mould for prefabricated T beam, it is related to a kind of prefabricated leakage orifice mould technical field for prefabricated T beam, including leakage orifice mould body, the upper portion of leakage orifice mould body is provided with lifting frame, lifting frame rests on the both sides mode of prefabricated T beam, the downward fixed connection of lifting frame is opposite the boom of the position of leakage orifice mould body, the lower end of boom is provided with connecting mechanism, the top of leakage orifice mould body is fixedly connected with inverted U type pull rod, and the connecting mechanism is detachably fixedly connected to pull rod.The utility model is by setting detachable connecting mechanism, the installation of leakage orifice mould body can be conveniently disassembled, lifting frame is used, the vertical position of leakage orifice mould body can be accurately positioned, and leakage orifice mould body is lifted after pouring and is removed, save time and labour, avoid damaging leakage orifice inner surface.

The application provides a mobile high-speed railway lubricating and wear-reducing device and a mobile high-speed railway lubricating and wear-reducing system. The mobile high-speed railway lubricating and wear-reducing device comprises a walking support assembly, an adjusting assembly and a coating assembly. The adjusting assembly has a first driving part and an elastic adjusting part. One end of the elastic adjusting part is in abutment with a secondary support part. The coating assembly is connected to a primary support part at a first preset angle through a mounting member, and the mounting member can adjust the position of the coating assembly in the vertical direction. The total length of the primary support part and the secondary support part is adapted to the width of the track by using the adjusting assembly, that is, the width direction is adjusted and limited. The height direction of the coating assembly is adjusted by using the mounting member, so that the output end of the coating assembly corresponds to the position to be coated, that is, the height direction is adjusted and limited. The application realizes accurate positioning of the position to be coated by adjusting and limiting the height direction of the coating assembly and adjusting and limiting the width direction.

This invention discloses a method for identifying the deterioration of subgrades of long-service highways based on a shear modulus inversion model. It utilizes various sensors embedded in the subgrade to acquire multi-source monitoring data of the target road segment, including environmental parameters, mechanical response parameters, physical state parameters, and spatial location information, and performs preprocessing. By constructing hysteresis features and removing recursive features, an in-situ subgrade shear modulus inversion model is established, transforming the multi-source monitoring data into a shear modulus distribution field that considers the temporal changes in the subgrade's state and includes spatial information. Based on the inverted spatial distribution field of the shear modulus, spatial variability indices such as the coefficient of variation and Moran's index are calculated, and the subgrade deterioration state is identified based on its evolution trend, outputting the deterioration identification result. This invention provides a scientific basis for maintenance decisions.

The utility model relates to welding frock technical field more specifically says a kind of fixing device suitable for fuel oil manifold assembly welding, including main body positioning and pressing mechanism and auxiliary positioning and pressing mechanism;The main body positioning and pressing mechanism includes bottom plate, support, positioning plate, bolt I, pressing plate I, screw II, gasket II, gasket III, nut III and pressing plate II, and the auxiliary positioning and pressing mechanism includes supporting block, adjusting support, nut IV, pressing plate III, support, bolt II and nut VI;The utility model realizes the positioning between parts, to avoid the temperature higher generated in welding process, operator cannot directly use hand to fix the position between each part.

This utility model discloses a heat insulation film molding die for composite material parts, including a die body with a two-stage stepped structure. The upper stepped surface of the die body has a first model-attaching surface, and the lower stepped surface of the die body has a second model-attaching surface. Positioning bosses are provided at both ends of the first and second model-attaching surfaces, and positioning grooves are provided on the positioning bosses. In this utility model, the die is an integral structure. By setting two model-attaching surfaces on the die and providing positioning bosses at both ends of the first and second model-attaching surfaces, the positioning grooves on the positioning bosses can match the lugs of the pre-formed sheet, achieving precise positioning of the sheet and the die. This utility model uses a single die for two transfers combined with heat insulation film pre-forming technology to achieve precise preparation of Z-shaped part preforms, significantly improving the part forming quality and effectively reducing tooling costs.

The application discloses a kind of laser cutting platform for equipment metal accessory processing, it is related to metal accessory processing technical field, including upper frame and lower frame, the inside of upper frame is provided with placing disc, and the bottom of placing disc is equipped with adjusting assembly for assisting the cutting of inclination angle, the adjusting assembly includes ball shaft, ball sleeve, threaded rod, outer screw, link disc, servo motor one, driving gear and transmission gear, and ball sleeve is rotatably installed at the bottom of ball shaft, the bottom of ball sleeve is rotatably provided with threaded rod, and the outer surface of threaded rod is screw-mounted with outer screw, the bottom of outer screw is provided with transmission gear, and driving gear is engagedly installed on one side of transmission gear.The laser cutting platform for equipment metal accessory processing is integrally arranged with the lower frame by link disc, and support column is symmetrically distributed, and the stable transmission of servo motor two and connecting shaft in cooperation with driving assembly can drive the stable rotation of placing disc, to realize the accurate positioning of workpiece circumferential direction.

The invention discloses a method for rapidly screening traditional Chinese medicine chemical components based on a UHPLC-HRMS multi-dimensional data filtering technology, and relates to the technical field of mass spectrum data analysis and the technical field of traditional Chinese medicine complex system component analysis. Comprising the following steps: acquiring sample mass spectrum data, performing format conversion on the data, and importing into an analysis system; a polygonal mass loss filtering window is set for different types of target objects, and preliminary screening of data is achieved; secondary fine screening is carried out through diagnosis ion filtering and neutral loss filtering, and screening results are classified, identified and distinguished; carrying out fine analysis on the complex data region by adopting a region segmentation strategy; and finally associating primary and secondary mass spectrum information to complete the identification of the target compound. According to the method, through multi-stage filtration and visual interaction, the screening efficiency and accuracy of the target compound in the complex matrix are remarkably improved, and the method can be widely applied to rapid discovery and accurate identification of the target compound in the fields of traditional Chinese medicine complex systems, natural products, metabonomics and the like.

This utility model discloses a hydraulic pressing device for assembling gear shafts, belonging to the field of gear shaft technology. It includes: a worktable; a U-shaped pressing plate installed on the worktable surface, with an inverted L-shaped vertical plate welded to the outer wall behind the U-shaped pressing plate; an assembly component disposed within the U-shaped pressing plate and centripetally holding a gear component; a hydraulic pressing component longitudinally installed on the inner top wall of the L-shaped vertical plate, with a shaft body pressed down at its bottom lifting end, the bottom end of the shaft body being inserted into the shaft hole of the gear component; the gear component is centripetally clamped by two symmetrically arranged arc-shaped internal gear plates on its circumference. During the pressing process of the hydraulic pressing component, the shaft body is raised and lowered for positioning by a positioning auxiliary component to prevent the shaft body from getting stuck in the shaft hole. This utility model avoids the errors caused by traditional manual adjustment, achieves precise positioning of the gear component, improves assembly efficiency, and achieves the effects of improving assembly accuracy and reducing manual labor intensity.

The application relates to a clamping mechanism and a clamping device, the clamping mechanism comprising a clamping seat, a clamping assembly, a limiting piece and a sensing assembly, the clamping assembly comprising a fixed clamping piece, a movable clamping piece and a clamping driving piece, the fixed clamping piece being fixedly arranged on one side of the clamping seat, the movable clamping piece being movably arranged on one side of the clamping seat and oppositely arranged with the fixed clamping piece, the clamping driving piece being arranged on the clamping seat and being drivingly connected with the movable clamping piece, the limiting piece being arranged on the clamping seat and being located between the movable clamping piece and the fixed clamping piece, and the sensing assembly being arranged on the clamping seat and being located between the movable clamping piece and the fixed clamping piece. The clamping mechanism can clamp a workpiece by the movable clamping piece and the fixed clamping piece, the position of the workpiece can be limited by the limiting piece before clamping, accurate positioning of the workpiece can be realized, the movable clamping piece and the fixed clamping piece can accurately grab the workpiece, and the sensing assembly can abut against the workpiece after limiting, so that whether the workpiece is grabbed can be detected, and the movable clamping piece and the fixed clamping piece can be prevented from grabbing the workpiece.

The utility model relates to the technical field of chip plastic packaging equipment, in particular to an automatic chip plastic packaging device, which comprises a mounting rack, a chip placing plate is arranged at the top of the mounting rack, a plurality of plastic packaging modules are embedded in the top surface of the chip placing plate, a movable positioning mechanism is arranged between the chip placing plate and the mounting rack, and the plastic packaging modules are arranged on the mounting rack. A fixing frame is fixedly mounted on the outer side of the mounting frame, a controller is fixedly arranged on the rear side of the fixing frame, a synchronous electric push rod is fixedly mounted on the top of the fixing frame, a moving plate is arranged at the bottom of the fixing frame, a U-shaped support is fixedly mounted on the outer side of the moving plate, and a plurality of injection molding openings are formed in the top of the moving plate. The bottom of the moving plate is provided with an upper module, and the top end of the positioning column is fixedly provided with an anti-falling block, through the arrangement of the automatic chip plastic packaging device, the plastic packaging effect of the device is ensured through the structural design in the moving positioning mechanism, and subsequent use is facilitated.

The utility model discloses a PCIe Gen 6 data connector, and relates to the technical field of connectors. Comprising an insulation shell and a PCB, the insulation shell is provided with an elastic piece used for being connected with a board end connector in a locked mode, the connector further comprises a pull belt, one end of the pull belt is connected with the end, away from the insertion end of the circuit board connector, of the elastic piece, and the other end of the pull belt serves as a free end and is used for pulling the elastic piece, so that the circuit board connector and the board end connector are separated from locking. According to the utility model, by pulling the drawstring, the elastic sheet is deformed to realize unlocking, and the drawstring plays a role of a lever, so that the unlocking is more labor-saving.

The application belongs to the field of track assembly and relates to a positioning mechanism for assembly, which is used for positioning a plurality of products arranged in a straight line. The positioning mechanism comprises a bottom base plate, a locking piece and a correcting piece. The bottom base plate has a front surface and a back surface. The back surface is configured to be connected with the ground in a positioning mode, and the front surface is configured to support the splicing ends of two adjacent products. The positioning mechanism can quickly realize accurate positioning of the products through cooperation of the locking piece and the correcting piece, so that the positioning operation can be quickly realized when the products are spliced. In addition, the splicing accuracy of the two products can be ensured through the correcting piece. Once position deviation occurs after splicing, the correcting piece can be used for re-correction, and the efficiency is high and the maintenance difficulty is low.

The application relates to the technical field of intelligent fault diagnosis, and discloses an intelligent fault diagnosis method and system for an agricultural tractor engine, the method comprising the following steps: collecting vibration, temperature and rotating speed original operation parameters of key positions of the tractor engine, obtaining a denoising parameter sequence through multi-point synchronous collection and denoising treatment; extracting time sequence characteristic analysis parameters to analyze parameter change trends, triggering abnormal detection when the parameters exceed a preset threshold value, and determining local abnormal components of the engine; combining a historical fault database to perform component fault potential correlation analysis and generate a cause distribution diagram, matching real-time correlation data to locate implicit damage components; adjusting engine load parameters, synchronously updating a fault library and optimizing fault matching rules, and generating fault diagnosis basis suitable for a current working environment. The method can realize accurate diagnosis, early warning and closed-loop self-optimization of diagnosis rules of engine faults under complex working conditions.

The invention relates to the technical field of corner combining machines, and discloses a corner combining machine with an adjustable presser foot frame and a presser foot frame debugging method.The corner combining machine comprises a rack, a corner combining cutter and a front presser foot frame, the corner combining cutter moves on the rack, the front presser foot frame is arranged on the rack, the corner combining machine further comprises a rear presser foot frame moving on the rack, and the rear presser foot frame comprises a main frame body, a presser foot top and a distance fixing assembly; the presser foot tops are arranged on the main frame body and are distributed in the vertical direction, and each presser foot top is provided with a first presser foot edge and a second presser foot edge which are used for abutting against a sectional material in the corner combining process and intersect with each other; the distance fixing assembly comprises a mounting seat, an adjusting seat, an adjusting piece and a distance adjusting seat; the mounting seat is mounted on the main frame body; the adjusting seat is provided with a first distance side which corresponds to and is parallel to the first presser foot side; the distance adjusting base moves on the adjusting base in the direction parallel to the moving direction of the adjusting base relative to the mounting base and is provided with an extending part, and the extending part is provided with a second distance fixing edge and a third distance fixing edge which correspond to and are parallel to the second presser foot edge. The machining quality can be improved.

The invention discloses an underwater sound source target detection, identification and positioning method and device based on a millimeter wave radar, and belongs to the technical field of underwater target detection, identification and positioning. The method comprises the following steps: acquiring a water surface echo signal by using a millimeter wave radar, and performing Fourier transform to obtain a distance-time spectrum; extracting a slow time phase sequence of each range gate in a radar beam coverage range, and obtaining a sound-induced water surface vibration signal after unwinding and filtering; performing correlation calculation on the vibration signal and a preset target feature library, or realizing target recognition through a deep learning model; a multi-radar cooperation or single-radar digital beam forming technology is adopted for target positioning, and large-range water area searching is achieved. According to the invention, the millimeter-wave radar is used for detecting micron-sized water surface vibration with high phase sensitivity, the defects of short distance, complex arrangement and the like of traditional acoustic and optical detection are overcome, and the system has large-range, real-time and non-contact underwater target detection and positioning capability.