10230results about How to "Improve work efficiency" patented technology

The invention discloses a device judging whether or not an earth pressure balance shield earth chamber is full. The device comprises a pressure detector disposed on the upper portion of a front shield earth chamber of the earth pressure balance shield; the signal output end of a pressure sensor is connected with an upper computer; the upper computer judges whether or not the chamber is full; if not, a warning signal is sent to an alarm unit. The device has the advantages that whether or not the earth chamber is full can be judged anytime during earth pressure balance shield tunneling, full-chamber shield tunneling can be ensured and the application of full-chamber tunneling decreases the danger of collapse ahead.

Provided is an environment-friendly mobile collecting box for decoration cutting dust. The mobile collecting box comprises a box body, wherein a water tank is fixedly mounted on one side of the bottomsurface of the inner wall of the box body, the bottom surface and the outer side of the water tank are fixedly connected to the inner wall of the box body separately, the inner side of the water tankis fixedly connected to one side of the box body, and openings are formed in the top surface and the other side of the box body; a first through hole is formed in the bottom of the inner side of theinner wall of the water tank, a switching valve is disposed in the first through hole, and a second through hole is formed in one side of the box body; the interior of the first through hole communicates with the interior of the second through hole, and the second through hole communicates with the interior of the box body; the top surface of the water tank is fixedly connected to one end of a hose, and the other end of the hose is arranged in the box body, and a floating plate is fixedly mounted on the periphery of the other end of the hose. Sediment in the box body can be pushed directly into the garbage bag through cooperative use of a mud box and a garbage bag, and the mud box can be taken and placed freely; after the mud box is taken out, a sealing cap of the garbage bag containing the sediment is removed, and after the garbage bag is replaced by a new garbage bag, the mud box is put back, and the sediment is not in contact with the mud box, and cleaning of the mud box by a user is not needed, so that time and labor are saved.

The invention discloses an automatic torsion testing machine. The automatic torsion testing machine comprises a first table support, a second table support, a third table support, a fourth table support and stand bars, wherein the framework of the whole torsion testing machine is formed by the first table support, the second table support, the third table support and the fourth table support, the stand bars are installed on the bottom corners of the framework, a working table is arranged above the third table support and the fourth table support, a second part detecting sensor is installed above the third table support and on the working table, and a first part detecting sensor is installed above the fourth table support and on the working table. The automatic torsion testing machine has the advantages that working efficiency is improved, labor intensity of workers is relieved, and the integral advanced level of an enterprise can be improved.

The automatic soot blowing furnace comprises a furnace body, a conveying device is arranged outside the furnace body, the conveying device is used for conveying a cupel into the furnace body, and a furnace door capable of being automatically opened and closed is arranged on the furnace body; and an endoscopic camera is arranged in the furnace body and is used for monitoring a soot blowing end point. The device can control the cupel to automatically enter and exit from the hearth, frequent door opening and closing are not needed, the temperature in the furnace is stable, energy consumption loss is reduced, harmful gas emission is reduced, and cost reduction and efficiency improvement are facilitated; image data are acquired by adopting a light supplementing lamp and an endoscopic camera, so that the method is more reliable and accurate; and the cupel subjected to soot blowing is taken out in time through the material taking module, the loss of metal silver is reduced, and the extraction content is increased. Due to feeding and discharging of the cupel, automatic operation is achieved, the working efficiency is improved by 50%, and the cupel can be in butt joint with full-automatic equipment.

The invention relates to the technical field of measurement and detection, in particular to a test sieve calibration method based on machine vision. Comprising the following steps: acquiring a test screen image by a microscope, firstly performing graying processing on an original image, and converting a color image into a grayscale image; the method comprises the following steps: carrying out binarization processing on a grey-scale image, carrying out binarization on the image, setting a grey-scale value of a pixel point on the image to be 0 or 255, enabling the whole image to present an obvious visual effect which is only black and white, and better analyzing the shape and the contour of an object through binarization; and performing connected domain analysis on the binary image, finding a pixel point to which each sieve hole belongs, endowing each pixel point with a label through the connected domain analysis, and forming a connected domain by the pixel points with the same label value so as to realize segmentation of the region of interest. The method is applied to the measurement calibration work of the test sieve, the working efficiency of verification and calibration personnel can be greatly improved by using the method, and human resources are saved.

The utility model discloses a grading screening type machine-made sand processing device which comprises a working table, a bottom cover, a top cover and a crushing and grading screening synchronizing mechanism, the bottom cover is arranged at the top end of the working table, and a plurality of coaxially-arranged circular-truncated-cone-shaped supporting cylinders are arranged at the upper end, where the inner side of the bottom cover is located, of the working table; the synchronizing mechanism comprises an inverted circular-truncated-cone-shaped shell, the shell is coaxially arranged on the inner side of the supporting cylinder, and the shell is provided with a crushing unit; the crushing unit is connected with the bottom cover through the top cover, the outer wall of the shell is divided into a plurality of filtering units through a first annular framework from bottom to top, the mesh number of the filtering units is sequentially reduced from bottom to top, and a sealing plate is arranged at the bottom end of the shell; the sealing plate is rotationally connected with the top end of the workbench through a driving motor, and a plurality of annular grading filter screens are coaxially connected to the periphery of the shell from bottom to top. According to the device, the working efficiency of grading screening is improved, the production cost is saved, the occupancy rate of a construction site is reduced, the yield of machine-made sand processing is improved, and particle size mixing of finished machine-made sand particles is avoided.

The application provides a low-grade oil reservoir water injection development effect evaluation method, comprising the following steps: S1, collecting core scale limit oil displacement efficiency data; S2, collecting well pattern controlled reserve degree data; S3, calculating sweep efficiency of the low-grade water drive oil reservoir; S4, correcting the sweep efficiency according to the changes of reservoir physical property parameters caused by near-well pollution and reservoir energy decline; and S5, calculating the reference recovery rate and evaluating the development effect. The application can effectively avoid collecting and arranging a large number of cumbersome production dynamic data, fully utilize the flow characteristics and dynamic physical property parameter evolution of the low-grade oil reservoir, accurately evaluate the development effect of the low-grade oil reservoir, and be beneficial to efficient development of the low-grade oil reservoir.

This application belongs to the technical field of air compressor safety, and particularly relates to a safety operation method for a piston air compressor. A safety operation method for a piston air compressor includes the following steps: S1, a flexible baffle is provided on an air-cooled plate cooler connected to the piston air compressor; S2, temperature data of each cooling unit at the current moment is obtained, and at the same time, the temperature change trend and the opening area change trend of the air outlet end of each cooling unit are obtained; S3, according to the pressure dew point temperature of the air outlet end of each cooling unit at the current moment, the opening area of each cooling unit at the current moment is adjusted to change the coverage degree of the flexible baffle on the air-cooled flow channels of each cooling unit at the next moment, so that the temperature of the air outlet end of each cooling unit is always above the corresponding pressure dew point temperature. This application can尽量避免活塞式空压机在运行的过程中发生冰堵或油乳化,保证活塞式空压机的安全运行。 It should be noted that there is an unclear part in the original Chinese text "尽量避免活塞式空压机在运行的过程中发生冰堵或油乳化,保证活塞式空压机的安全运行。" which may need to be further clarified for a more accurate translation. The above translation is based on the best understanding of the current text.

The invention relates to the technical field of intelligent traffic, and discloses a device for intelligent automatic control of cleaning of a hydraulic supporting rod. The device comprises a closed disc, the interior of the closed disc is movably connected with a movable sliding block and a reset spring, the lower part of the closed disc is movably connected with a pollution discharge track, theinterior of the pollution discharge track is movably connected with a pollution control sliding block, the right side of the closed disc is movably connected with a transmission wheel, the upper partof a transmission wheel valve is movably connected with a cleaning wheel, and the left side of the cleaning wheel is movably connected with a supporting base. The cleaning wheel is controlled to startrotating to drive the movable sliding block to rightwards move, the movable sliding block resets under the elasticity effect of a movable spring, meanwhile, the lower part of the movable sliding block is movably connected with a pollution removal brush, dust and the like on the outer side of the hydraulic rod is removed through motion of the pollution removal brush, thus the effect of cleaning the outer side of the hydraulic rod is achieved, and the working efficiency is improved.

The invention discloses a gas forklift, which comprise a forklift body and also comprises a gas tank, wherein the gas tank is arranged on a rear seat of the forklift body through a fixed support; the fixed support comprises a support frame and clamp rings; the clamp rings are formed by hinging two arc-shaped clamp arms; the end parts of one arc-shaped clamp arm is provided with a clamp splice; the clamp splice is provided with a through hole; the end part of the other arc-shaped clamp arms is hinged with an insertion; and each insertion is provided with an insertion rod which passes through the through hole and is locked by a nut. By adopting the structure, the gas forklift disclosed by the invention has the following advantages that 1, as the gas tank is installed on the rear seat of the forklift, the service time of the gas of the forklift can be prolonged, frequent gas filling is avoided, and the working efficiency is increased; 2, meanwhile, the gas tank is convenient in replacement, so that operation troubles brought by opening the rear seat of the forklift when gas filling is performed are avoided; and 3, the two arc-shaped clamp arms can be conveniently connected or loosened, therefore, not only is the gas tank fixed but also the gas tank can be conveniently replaced.

The invention discloses a digital twinning long-span bridge earthquake wind vibration and vibration reduction and isolation system and method, the system takes a high-fidelity digital model for constructing a long-span bridge as a basis, comprises full life cycle monitoring and management of the bridge under earthquake, wind vibration and vibration reduction and isolation conditions, and is based on a sky-air-ground-water integrated ubiquitous sensing module. In combination with artificial intelligence algorithms such as deep learning and a pulse neural network, real-time state evaluation of a bridge structure, material nonlinear analysis, geometric nonlinear analysis, multi-point excitation and pile-soil-structure interaction simulation, wind-induced fatigue damage prediction, earthquake vulnerability evaluation and closed-loop control scientific decision based on an artificial intelligence body are realized. According to the invention, system support and method guidance can be provided for large-span bridge anti-seismic and anti-wind design, intelligent monitoring, operation and maintenance management and vibration reduction and isolation system optimization.

The invention relates to the technical field of time length detection, and discloses a news simulcasting time length detection alarm method based on voice recognition, which comprises the following steps: S1, noise reduction: integrating an advanced digital signal processing technology and a professional noise reduction algorithm to form a refined processing system adaptive to'news simulcasting 'audio, according to the system, aiming at collected useless components such as environment noise and equipment noise, noise characteristics are captured through a multi-dimensional signal analysis model, an effective information core identifier is defined, a differentiated characteristic database of signals and noise is constructed, and a technician sets scientific noise reduction parameters according to the differentiated characteristic database. And accurate noise identification and stripping: integrating an advanced digital signal processing technology and a professional noise reduction algorithm, capturing noise characteristics through a multi-dimensional signal analysis model, accurately stripping environmental noise (such as studio echo and external interference sound) and equipment noise (such as sound recording equipment floor noise and transmission link electromagnetic interference), and simultaneously retaining the original texture of effective audio.

The utility model discloses a round rubber part flash cutting device which comprises a workbench, a fixing mechanism is arranged above the workbench, the fixing mechanism comprises a shell, and the fixing mechanism is used for fixing a round rubber part; a rotating mechanism is arranged below the shell, and the rotating mechanism is used for rotating the shell; a moving block is arranged at the position, corresponding to the shell, above the workbench, a connecting rod is connected to the side, close to the shell, of the moving block, and a cutter is connected to the lower portion of the end, close to the shell, of the connecting rod; after cutting is completed, a first motor and a third motor rotate reversely, a cutting knife and a positioning block are made to be far away from the circular rubber part, at the moment, the circular rubber part is taken down from the containing table, then the flash of the next circular rubber part can be cut, and after the flash of the circular rubber part is cut, the flatness of the circular rubber part can be guaranteed; and the use is convenient, and the working efficiency can be improved.

The invention discloses an air pipe air leakage detection device which comprises a metal plate base, supporting legs are welded and fixed to the metal plate base, and telescopic shafts are slidably connected to the supporting legs. The test panel is rotationally connected to the telescopic shaft, an assembly plate is detachably connected to the test panel, a plurality of mounting discs are arranged on the surface of the assembly plate, and test pipes are mounted on the mounting discs; the air valve assembly is located on each installation disc. A plurality of test tubes can be simultaneously measured by the plurality of mounting discs in batches, so that the working efficiency of the test is improved. The connecting pipelines of the air valve assemblies are mutually connected in series, so that the interiors of the test pipes are communicated, when the interiors of the test pipes are inflated, air can be conveyed into the test pipes through series connection of the air valve assemblies, and therefore sealing performance testing is carried out in batches. And the height position of the detachably connected assembly plate can be adjusted on the test panel, so that the installation height of the test tube is adjusted, and the practical function is further improved.

The application discloses a double-hearth two-stage heating vacuum distillation furnace, which comprises an evaporation furnace and a condensation furnace which are communicated through a gas passage, wherein the evaporation furnace comprises an evaporation furnace body and at least one top heating mechanism which is detachably arranged on the top of the evaporation furnace body; and the condensation furnace comprises a condensation furnace body, a side heating structure and a furnace cover, wherein the condensation furnace body is divided into a temperature control condensation chamber and a plurality of layers of multistage condensation chambers, and the gas passage can be combined or replaced according to the required reaction conditions of different materials. The vacuum distillation furnace can collect different metals through the gradient change of the temperature of the two hearths, reduces the process of secondary distillation of volatile matters after the furnace is stopped, can complete the processing of diversified raw materials, improves the work efficiency and reduces the processing cost; the modular top heating mode directly radiates heat to the materials, improves the heat utilization rate, can realize the working mode of stopping the furnace without stopping the work, helps to improve the work efficiency, and is convenient for completing the furnace cleaning, maintenance and solid material taking and placing.

The utility model relates to the technical field of breeding equipment, in particular to a safe and residue-free piglet milk supplementing system which comprises a feeding device, a weighing device, a mixing device, a conveying device and an ingestion device. The automatic milk supplementing device is particularly suitable for milk supplementing operation of piglets, automatic operation of milk supplementing of the piglets is achieved, manual participation is reduced, the working efficiency is high, accurate feeding of the piglets can be achieved, and growth and development of the piglets are better facilitated. The required accurate amount of raw materials such as milk powder can be added into the mixing device through the feeding device and the weighing device, the required amount of water is added, the materials are stirred evenly and then enter the conveying device, the required amount of milk is conveyed into the corresponding feeding trough through the conveying device, only the required amount of milk is conveyed into one feeding trough each time, personalized feeding is achieved, and the feeding efficiency is improved. Development of different piglets is facilitated, automatic operation is more convenient, manual operation is reduced, and the working efficiency is high.

The utility model relates to the technical field of building material test piece manufacturing equipment, in particular to a test piece batching tool for a proportioning test of construction waste roadbed filling soil, which comprises a frame body, a front cover, a partition plate, an unloading drawing plate, a drawing plate film and a film roller, wherein the front cover is mounted at one end of the frame body, the unloading drawing plate is mounted at the lower part of the frame body, the frame body, the front cover and the unloading drawing plate form a batching box with an upper opening, and the partition plate is mounted in the frame body and used for partitioning the space in the batching box; the material supply proportion is controlled through the partition plate, weighing operation is converted into measurement operation, the operation process is simplified, meanwhile, the installation angle and position of the partition plate are changed, continuous change of the proportion of a single test piece can be achieved, the function of testing indexes of test pieces with different proportions at different positions of the same test piece is achieved, the manufacturing amount of the test pieces is reduced, and the cost is reduced. And the efficiency of related work is improved.

The invention discloses a multi-delivery robot path collaborative optimization system and a scheduling method, and aims to solve the problems of non-uniform scheduling load, unsmooth path, weak conflict avoidance capability and poor dynamic adaptability of existing multi-robot scheduling. The system comprises a central scheduling module, a distribution robot terminal, an environment sensing module and a map management module, and realizes task analysis, state monitoring, path planning and conflict coordination. According to the method, region division and task balanced distribution are completed by improving a DARP algorithm, path coverage efficiency and smoothness are optimized by fusing a BA * algorithm, a cattle farming method and a TEB algorithm, multi-type path conflicts are solved by adopting a time window reservation and distributed negotiation strategy, and dynamic adjustment under new task access, robot faults and environment sudden change is supported. According to the method, the load balance, the path optimization effect and the conflict avoidance capability of multi-robot collaborative distribution can be remarkably improved, the efficient and stable execution of the distribution task is ensured, and the method is suitable for terminal distribution scenes such as communities and office buildings.

The invention discloses a roadway tunneling and conveying all-in-one machine with impact cutting teeth for assisting rock breaking. The roadway tunneling and conveying all-in-one machine comprises a walking mechanism, a main machine body, a material conveying mechanism, a material receiving mechanism, a multi-dimensional adjusting mechanism, a rotary driving mechanism and a cutting head mechanism. Cutting tooth units distributed along a spiral track are arranged on the surface of the cutting head mechanism, energy storage rebound mechanisms are arranged in the cutting tooth units, impact inertia kinetic energy is stored and released through multi-layer irregular arrangement of balls, secondary rock breaking is achieved, and the cutting efficiency and the hard rock adaptability are improved. The multi-dimensional adjusting mechanism expands the operation range through cooperation of a rotating base, a hydraulic cylinder and a hydraulic telescopic rod. The material receiving mechanism comprises an angle-adjustable material containing plate and symmetrically-arranged material sweeping wheels, the material sweeping wheels buffer a material pushing plate through springs to avoid collision damage, and an auxiliary feeding mechanism is arranged to enhance the material conveying continuity. Impact kinetic energy is recycled, the cutting range is flexible and adjustable, efficient collection and conveying of materials are integrated, and the device is suitable for high-hardness rock stratum roadway tunneling.

The present application relates to the technical field of shelves, especially to an intelligent cantilever three-dimensional combined shelf, which comprises a base and a vertical plate, both ends of the top of the base are equipped with the vertical plate, multiple cantilever plates are evenly fixed on both sides of the vertical plate through screws, the inner side of the base is equipped with a quick connection mechanism, the quick connection mechanism is used for connecting between two adjacent bases, a lifting mechanism is equipped between the base and the vertical plate, the lifting mechanism is used for height adjustment of the vertical plate, the quick connection mechanism comprises a strip plate, a surface groove, a force guide rod, a recess, a spring, a plugging plate and a chuck, the structure design of the quick connection mechanism makes the device convenient for quick connection between two adjacent bases, accelerates work efficiency and improves the efficiency of the device, and the structure design of the lifting mechanism, the limiting mechanism and the control box makes the device capable of intelligently adjusting the height of the vertical plate, so that the use effect is good and the flexibility of the device is improved.

The application discloses a powder bonding forming device and method for a complex geological model, which comprises a 3D printing control system, a material conveying tank, a powder falling and paving assembly, a forming box, an inkjet printing assembly, a rack, a forming box moving assembly, a longitudinal beam module and a powder cleaning assembly; the material conveying tank is fixed above the powder falling and paving assembly; the powder falling and paving assembly and the inkjet printing assembly are respectively fixed on longitudinal beam sliding rails of the longitudinal beam module through sliding blocks, and the two are separately moved without interfering with each other during printing and forming; the forming box is located directly below a rectangular space surrounded by the longitudinal beam module, and a forming platform is located in the forming box; the forming box moving assembly is arranged at the bottom of the forming box, and the forming box can be moved along a tow chain to realize moving in for printing and moving out for powder cleaning. The powder paving and bonding functions of the equipment are realized through different modules, the printing efficiency is improved, in addition, the forming platform is lifted from the side, the overall height of the equipment is greatly reduced, and stable vertical movement of the equipment is ensured.

The utility model relates to the technical field of welding quality detection, in particular to an integrated rapid welding detection device for pore analysis and automatic interpretation, which comprises a detection table, a controller, a detection mechanism and an adjusting disc, an adjusting plate is arranged between the adjusting disc and the detection table, a rotating mechanism is arranged between the adjusting plate and the adjusting disc, and the rotating mechanism is connected with the detection table. A displacement mechanism is arranged between the adjusting plate and the detection table, a fastening plate is arranged on the adjusting disc, a T-shaped groove is formed in one side of the fastening plate, an iron plate is arranged on the T-shaped groove, a T-shaped block is arranged on the T-shaped groove, a clamping assembly is arranged at one end of the T-shaped block, an electromagnet is embedded into the other end of the T-shaped block, and a clamping assembly is arranged on the other end of the clamping assembly. According to the structure, the adjusting disc can rotate by 360 degrees in the detection process through the rotating mechanism, it is ensured that each angle of the welding position can be comprehensively detected, and detection blind areas possibly existing in a traditional method are avoided.

The utility model discloses an anti-tilt scaffold which comprises a steel frame and two crossed supporting rods arranged on the two sides of the steel frame, the outer sides of the four corners are respectively provided with a pair of fixing pieces, an inner rod is arranged between the fixing pieces, a plurality of limiting holes are formed in the inner rod, a sleeve rod is arranged on the outer side of the inner rod, and the sleeve rod is connected with the steel frame. An adjusting knob is arranged on the sleeve rod, through holes are formed in the two sides of the lower portion of the sleeve rod respectively, an inserting rod is arranged at the bottom of the sleeve rod, a spring is arranged on the outer side of the inserting rod, a base is arranged at the bottom of the inserting rod, rotating pieces are arranged on the two sides of the base respectively, and a bottom plate is arranged below the rotating pieces. According to the scaffold, the two sides of the steel frame can be supported, the steel frame is prevented from inclining towards the two sides, the safety risk of workers is reduced, and through friction between the inserting rods and the sleeve rods and the buffering effect of the springs, shaking of the scaffold can be reduced, and the scaffold is stabilized.

The utility model relates to the technical field of valve maintenance equipment, in particular to a portable anti-explosion valve cleaning device, which is characterized in that the polarities of the opposite surfaces of two fixed magnetic field sources are the same, and a movable electromagnetic coil is arranged between the two fixed magnetic field sources; the control unit is used for periodically changing the polarity of current supplied to the movable electromagnetic coil and driving the movable electromagnetic coil to reciprocate, the plunger pump is provided with a grease inlet and a grease outlet, the grease outlet is used for being communicated with a valve to be cleaned, and the grease inlet is used for being communicated with a grease body box; according to the utility model, the electromagnetic driving mechanism is adopted to replace the existing manual driving, so that the pumping-out speed and the working efficiency of cleaning fluid or lubricating grease are improved, the maintenance operation time of a single valve is shortened, and operators are liberated from heavy repeated physical labor.

This utility model discloses a testing device for pathological specimens, relating to the technical field of pathological specimen testing equipment. It includes a placement box, a testing mechanism, and a movable seat. The placement box has a hinged door on its front. The testing mechanism is mounted on the top of the placement box and is connected to it. Two first sliding grooves are formed on the bottom surface of the placement box. The bottom of the movable seat is slidably connected to the two first sliding grooves via a sliding connector. Two second sliding grooves are formed laterally on the top of the movable seat. An adjustable clamping and fixing mechanism is included, comprising a limiting frame, a bearing seat, a double-ended lead screw, a brake motor, and a clamping base. The limiting frame is fixed to the top of the movable seat by multiple support legs, and a through-hole limiting groove is formed inside the limiting frame. This utility model can be applied to the limiting and fixing of test tubes of various sizes, greatly improving the applicability and practicality of the device.

The application relates to a napping machine which comprises a rack, two rotating rollers connected to the rack, rotating members connected to the rotating rollers, installation cavities arranged in the rotating rollers, a plurality of brush groups connected to the rotating rollers, a plurality of first brushes in the brush groups, one end of the first brushes being used for contacting with cloth, the other end of the first brushes penetrating through the inner wall of the installation cavities, a moving assembly arranged in the installation cavities, the moving assembly being used for slidingly connecting the first brushes to the rotating rollers and driving the outer wall of the rotating rollers to push the lint away from the first brushes. The moving assembly drives the first brushes to move along the rotating rollers, the outer wall of the rotating rollers pushes the lint on the first brushes away from the first brushes, so that the lint on the surface of the rotating rollers can be manually cleaned, the cleaning time is reduced, and the work efficiency is improved.

The utility model discloses a kind of for building decoration tool's cleaning device, it is related to cleaning device technical field.The utility model includes cleaning tank, motor is fixedly connected in cleaning tank inner wall, motor top output end is fixedly connected with rotating plate by coupling, the rotating plate top is fixedly connected with several agitating blocks, and the agitating block is annular array with rotating plate as center.The utility model is through setting spoiler, specifically is motor starting driving rotating plate rotation, then again through rotating plate rotation to drive agitating block rotation, when agitating block rotation, inside water flow rotation will be stirred, when water flow rotation, it will impact on spoiler, so that the direction of water flow changes, causes water flow to appear disorder, then again through the friction between the water flow of disorder and tool to clean, simultaneously make that cleaning fluid can evenly distribute on tool surface, improve work efficiency, realize the uniform cleaning of tool.

The utility model discloses a kind of automatic circuit board feeding machines, including mounting bracket and the support leg connected in the bottom of mounting bracket, transverse moving assembly is installed with transverse moving frame on mounting bracket, the bottom of transverse moving frame is connected with longitudinal moving assembly, lifting assembly is installed in the both sides of longitudinal moving assembly, the bottom of lifting assembly is connected with suction assembly, cleaning assembly is connected in the both sides of suction assembly, suction assembly below is equipped with automatic lifting platform, one side of automatic lifting platform is equipped with belt conveyor.The utility model can be through suction assembly suction circuit board, and through lifting assembly, longitudinal moving assembly and transverse moving assembly drive suction assembly lifting, longitudinal moving and transverse moving, realize the movement of circuit board multidirectional, replace artificial feeding, reduce artificial cost, greatly improve work efficiency.

This application discloses an intelligent reflective surface and a covert communication system, belonging to the field of wireless communication technology. The intelligent reflective surface includes multiple intelligent reflective surface units arranged in an array; each intelligent reflective surface unit includes: a first substrate, a second substrate, and a third substrate; a metal patch and a varactor diode, located on the side of the third substrate opposite to the second substrate; the metal patch includes a first patch and a second patch, and the varactor diode is located between the first patch and the second patch, with its negative and positive terminals electrically connected to the first patch and the second patch, respectively; a metal ground plane, located between the first substrate and the second substrate; a first bias line and a second bias line, located on the side of the first substrate opposite to the second substrate; the first bias line is electrically connected to the metal ground plane and the first patch, respectively, and the second bias line is electrically connected to the second patch. This application can achieve precise control of electromagnetic waves, reduce electromagnetic energy loss, improve energy transmission efficiency, suppress electromagnetic wave leakage, and improve communication covertness.