28results about How to "Ensure strength" patented technology

This utility model discloses a shearing device for residual injection molded parts gates, comprising a rotary feeding system consisting of bottom support legs, a machine base, a rotating table, and a product placement slot; a shearing mechanism consisting of pneumatic shears and a drive unit; a clamping mechanism consisting of a lead screw, a movable rod, and a clamping block; and a waste collection system consisting of a through hole, a collection box, and a cleaning strip. This device achieves efficient and safe treatment of injection molded parts gates through its integrated design of continuous rotary feeding, automatic shearing and clamping, and directional waste collection. This utility model has advantages such as high production efficiency, safe operation, and thorough waste collection, and is suitable for mass production of various injection molded parts.

This utility model relates to the field of new energy battery support structure technology, specifically to a lightweight battery pack composite material bracket, including a skeleton layer and a reinforcing layer covering the skeleton layer. Connection holes are provided on the skeleton layer and the reinforcing layer, with metal bushings pre-embedded in the connection holes. The skeleton layer includes a lower support plate connected to the battery pack and an upper support plate connected to the vehicle base. The reinforcing layer includes outer reinforcing ribs covering the outer end faces of the lower and upper support plates and inner reinforcing ribs covering the inner end face of the upper support plate. The skeleton layer is made of continuous fiber nylon, and the reinforcing layer is made of short fiber plastic. The upper and lower support plates are connected by side support plates, and the reinforcing layer also includes a side covering layer covering the side support plates. This battery pack composite material bracket solution achieves both lightweight design and high load-bearing capacity while reducing costs.

The invention discloses a light-weight corrosion-resistant gas storage tank with a built-in pressure early warning device, which belongs to the technical field of pressure vessels and comprises a gas storage tank body, and a gas inlet and a gas outlet are symmetrically formed in two sides of the gas storage tank body. The pressure display mechanism composed of the first shaft rod, the pointer and the dial plate is arranged in the outer shell outside the gas storage tank body; through cooperation with a pressure early-warning transmission mechanism composed of an inner plate, a supporting sleeve, a membrane cavity, a membrane, a fixing plate, a sliding rod, a first spring, a sleeve, a spiral groove, a sliding block, a first permanent magnet and a second permanent magnet at the end of a first shaft rod in the gas storage tank body, real-time pressure display can be conducted during use, and non-contact transmission of magnetic coupling is adopted; the air storage tank body does not need to be additionally provided with a mounting hole, so that the strength and the air tightness of the air storage tank body are ensured, and the air storage tank is safer to use.

The invention discloses a multi-layer composite springback corrugated board and a production method thereof, and aims to provide the multi-layer composite springback corrugated board which is large in elastic coverage range, simple in structure and high in elastic buffering performance. According to the technical scheme, the multi-layer composite springback corrugated board is characterized in that a first springback layer is arranged in the middle of a corrugated coating layer, and a second springback layer is arranged in the middle of the corrugated coating layer; the second springback layer is arranged between the first springback layers to form a composite springback interlayer, the first springback layer is provided with a first springback space after the second springback layer is stressed, when the second springback layer is stressed to the maximum value, the second springback layer is further provided with a second springback space, the inner paper and the outer paper extrude the first springback layer, and the composite springback interlayer is formed. The first springback layer extrudes the second springback layer to form a first springback space and a second springback space, the first springback space and the second springback space are compressed, when pressure acting on the inner paper and the outer paper disappears, the second springback layer forms acting force on the first springback layer again, springback reset is formed, and therefore the optimal springback effect on the corrugated board is achieved, and the service life of the corrugated board is prolonged. The invention is suitable for the technical field of corrugated board production and manufacturing.

The utility model relates to a toothbrush with toothpaste storage bin, including the front toothbrush handle of card solid connection, rear toothbrush handle, the front toothbrush handle upper end is equipped with toothbrush head, the toothbrush head is planted with brush, and the handle body of front toothbrush handle is equipped with toothpaste storage bin, toothbrush head corresponds the side of brush hair and is equipped with the toothpaste outlet pipe mouth, the toothpaste outlet pipe mouth is equipped with self -sealing structure, the toothpaste storage bin with toothpaste outlet pipe mouth between is equipped with the connecting channel, the one end of toothpaste storage bin corresponds rear toothbrush handle and is equipped with open, and the inside of open end is equipped with sealing plug, sealing plug lower extreme is equipped with the advancing washer, the lower extreme of front toothbrush handle with the upper end of rear toothbrush handle cooperation is equipped with the card solid structure, the rear toothbrush handle is equipped with the advancing screw rod for driving advancing washer axial movement, the lower extreme of rear toothbrush handle is connected with manual knob, the toothbrush with toothpaste storage bin of the utility model, the whole structure is reliable, and the toothpaste outlet pipe mouth is reliable, and extruding toothpaste outlet is convenient, can add toothpaste repeatedly, and repeatedly uses.

This utility model discloses a seat frame outer guard plate installation structure, including a lower connecting plate for an adjuster, a seat frame side plate, a seat frame outer guard plate, and a steel wire assembly. The steel wire assembly includes front and rear support steel wires. The rear support steel wire extends in an upward-opening U-shape, with foot plates welded to both ends. The front support steel wire extends from the front end of the seat frame outer guard plate to the middle of the rear support steel wire and is welded to it. A foot plate is welded to the front end of the front support steel wire, and the foot plates are fixed to the seat cushion side plate. Multiple slots are spaced apart on the inner side of the seat frame outer guard plate, and the seat frame outer guard plate is engaged with the steel wire assembly through these slots. A cover is also engaged at the rear end of the seat frame outer guard plate, covering the inner rear end of the seat frame outer guard plate and pre-fixed to the lower connecting plate for the adjuster. The cover has an opening for the adjuster to pass through. This utility model solves the problems of easy deformation of the rear end of the existing seat frame outer guard plate under pressure and incomplete coverage of the internal structure of the seat frame.

The utility model relates to domestic appliance safety technical field discloses anti -tilt device, including flexible connecting piece and a plurality of anti -tilt support, flexible connecting piece is annularly arranged, a plurality of anti -tilt support are sequentially spaced apart along the extension circumferential direction of flexible connecting piece and are connected with flexible connecting piece, a plurality of anti -tilt support of the utility model are sequentially connected through flexible connecting piece, make whole structure can utilize the deformable characteristic of flexible connecting piece, flexible adaptation different the various shape of the article to be supported, whether regular square, round, or with the irregular mode such as rised, anti -tilt support can better adhere to the profile of the article to be supported through the adjustment of flexible connecting piece, thereby ensure that on various shapes of the article to be supported can stably install and play the anti -tilt effect, improve the versatility and adaptability of device, solved the problem that the anti -tilt base structure adaptability of purifier is limited.

This utility model discloses a high-efficiency degumming device for flax fibers, including a base. A degumming frame is fixedly installed on the top left side of the base, and a housing is fixedly installed on the top right side of the base. A motor is fixedly installed on the front side of the housing, and a rotating rod is fixedly installed at the output end of the motor. The other end of the rotating rod passes through the interior of the housing and is fixedly connected to a half gear. A toothed plate is movably engaged on the left side of the half gear, and a beating plate is fixedly installed at the bottom of the toothed plate. Through the combination of the above structures, this utility model achieves beating of the degummed flax fibers, thereby thoroughly separating the fiber bundles from the xylem, improving the fiber extraction rate, and removing residual glue and impurities, thus ensuring the strength and quality of the final yarn.

The invention relates to the technical field of welding equipment, and provides road anti-collision fence auxiliary welding equipment which comprises a frame body, a workbench is fixedly connected to the top of the frame body, air cylinders are fixedly connected to the two ends of the bottom of the workbench, movable seats are fixedly connected to the output ends of the two air cylinders, and the two movable seats are slidably connected to the two ends of the workbench correspondingly; telescopic shafts penetrating through the movable seats are rotationally connected to the top ends of the two movable seats, positioning mechanisms are arranged at one ends of the two telescopic shafts, a welding device used for butt welding of the handrails is arranged at one end of the top of the workbench, a driving mechanism is arranged at the other end of the top of the workbench, and a cooling mechanism is arranged in the middle of the workbench. The positioning mechanism adopts the design of a pressing rod, a clamping plate and a pressure spring to quickly clamp the handrail, so that the operation error caused by manual alignment is thoroughly avoided, and the welding position precision of the stand column flange bottom plate and the anti-blocking block is ensured.

The invention discloses a passive positioning method, device and system for a base station, a medium and a product, and relates to the technical field of computers, and the method comprises the steps: dynamically adjusting the beam optimization parameter of each phased-array antenna through a beam optimization resource allocation algorithm; navigation signals from a communication satellite and reflection signals from a plurality of passive terminals are received according to the beam optimization parameters of the phased-array antennas; performing signal analysis on the navigation signal and each reflection signal to obtain a distance difference value of each passive terminal; and processing the distance difference value by using a distributed phased array passive positioning algorithm so as to position each passive terminal. According to the embodiment of the invention, the accuracy of passive positioning of the base station can be improved.

The utility model discloses a clamping device for clamping stacked cylindrical bars one by one. The clamping device comprises a mounting bracket, a retractable bracket, a driving motor and a transmission component, at least one group of retractable brackets are arranged along the length direction of the mounting bracket; and if only one group of retractable bracket is arranged, a fixed bracket arranged along the length direction is also fixed on the mounting bracket. Each set of retractable support is provided with a transmission assembly, each transmission assembly comprises a connecting piece and an adjusting lead screw, the connecting pieces are installed on the installation supports in a sliding mode and move in the length direction of the installation supports, the retractable supports are fixedly connected to the lower portions of the connecting pieces, and the adjusting lead screws are rotationally installed in the installation supports and connected with the connecting pieces in a screwed mode. The driving motor is fixed to the middle of the mounting support, and an output shaft of the driving motor is in power connection with the adjusting lead screws of the transmission assemblies. The device has the advantages of being simple in structure, flexible to operate, wide in application range and high in stability, the clamping and carrying efficiency and safety of the cylindrical bar are remarkably improved, and high practicability and economical efficiency are achieved.

The utility model provides a disc type workpiece feeding and discharging device which comprises a workbench, a rotating mechanism and a rotating disc, the rotating mechanism and the rotating disc are arranged on the workbench, the rotating mechanism is fixed on the workbench and arranged at the bottom of the rotating disc in a supporting mode, the rotating mechanism is used for driving the rotating disc to rotate intermittently, and at least two stacking frames are distributed on the circumference of the top of the rotating disc. The stacking frame is provided with at least three limiting rods used for limiting and stacking the disc type workpieces, the limiting rods are circumferentially distributed and fixed to the top of the rotary disc at equal intervals, a heightening table is fixed between the limiting rods and the rotary disc, placing steps are formed between the top of the heightening table and the limiting rods, and an unstacking mechanism is arranged on the outer side of the stacking frame. The unstacking mechanism comprises a pair of steel forks used for being inserted into the area between the heightening tables, a translation mechanism arranged on the workbench and a lifting mechanism arranged on the translation mechanism. The disc type workpiece feeding and discharging device is simple in structure, high in loading capacity and low in cost.

The utility model relates to the technical field of building engineering, and discloses an assembly type building construction formwork which comprises a foundation, bearing rods are fixedly connected to the left side of the outer wall of the foundation at equal intervals, an outer wall is fixedly connected to the left sides of the bearing rods, and supporting plates are fixedly connected to the inner sides of the bearing rods. According to the utility model, the two outer walls are placed together in an aligned manner, then the two outer walls are spliced in an aligned manner towards the sealing gasket, the sealing gasket is clamped with the lines of the clamping block I and the clamping block II, and after the outer walls are spliced together in an aligned manner, the fixing block II slides into the inner side of the fixing block I, and the threaded rod enters the threaded hole in the outer wall of the fixing block II; the two outer walls can be fixed by rotating and tightening the threaded rods, so that the first fixing block and the second fixing block are tightly attached to the sealing gasket, the defect that pitted surfaces and honeycombs appear on the surface of a concrete layer due to the fact that cement paste flows out of gaps of the outer walls is avoided, and the strength and durability of the concrete layer are effectively improved.

This utility model discloses a connecting structure for shaped tube splicing, including a plate body. The plate body is made of metal, and multiple bends are formed in a straight line along the width direction of the plate body, arranged sequentially along the length direction of the plate body. The plate body can be bent along the bends, and the two ends of the plate body can be connected to form a shaped tube. Using a flat metal plate instead of a shaped steel tube blank as raw material significantly reduces material costs. Stamping to form the bends and punching holes in the unfolded flat state avoids the "flatness and height" difficulties caused by the shaped tube structure, resulting in more precise blanking dimensions and more accurate hole processing. This effectively solves the technical problems of large dimensional errors and difficulty in removing burrs inside holes and on the end faces in traditional processes, thereby improving product dimensional stability and overall quality.

The utility model discloses a pipeline argon filling welding protection device which comprises two protection units. The protection unit comprises a ventilation pipe, a guide ring arranged at one end of the ventilation pipe and a positioning frame arranged at the other end of the ventilation pipe. An elastic sealing ring is arranged on the periphery of the guide ring; an annular groove is formed in the outer wall of the guide ring; the elastic sealing ring is connected in the annular groove in a sliding manner; the guide ring is provided with a first joint; three adjusting screws are arranged on the periphery of the positioning frame; and the adjusting screw is in threaded connection with the positioning frame. An argon protection cavity is formed in the position between the two welding pipes, operation is easy and convenient, and the welding quality and efficiency can be improved; the protection device is firmly fixed on the pipe wall by adjusting the screw, so that the protection device is prevented from loosening and displacing; and meanwhile, the guide ring provides guiding and supporting effects for the elastic sealing ring, the sealing effect between the elastic sealing ring and the pipe wall is improved, and the service life of the elastic sealing ring is prolonged.

The utility model relates to an integrated flow guide structure and a water pump applying the same, and solves the problems that the structure is complicated, the assembly size is difficult to control, axial movement occurs during working and the like in the prior art. According to the technical scheme, the water purifier comprises an inner cylinder, an outer cylinder and a flow guide cover arranged in an inner cavity of the inner cylinder, the inner cylinder and the outer cylinder are provided with center water inlet channels which are sequentially communicated, the inner cylinder, the flow guide cover and the outer cylinder are of an integrated structure, and a plurality of flow guide walls which are arranged in a centrosymmetric vortex mode are arranged on the inner side wall of the outer end of the inner cylinder. The flow guide cover is fixed to the flow guide wall in a buckled mode, the outer side wall of the flow guide wall and the outer side wall of the flow guide cover are the inner side walls of the flow guide channel, the inner side wall of the inner cylinder is the outer side wall of the flow guide channel, and a flow guide opening is formed in the side wall of the outer cylinder. The integrated flow guide structure has the advantages of being beneficial to structure simplification, convenient to produce, machine and assemble, beneficial to improvement of assembly reliability and sealing performance, beneficial to prevention of axial movement, beneficial to guarantee of hydraulic efficiency of the water pump and reduction of noise due to the adoption of the integrated flow guide structure.

This utility model discloses a processing device for shielding covers of electronic products, including a feeding rack, a suction cup below the feeding rack, a connecting pipe at the top of the suction cup, an adapter and a conveying pipe on one side of the connecting pipe, an action plate on the outside of the conveying pipe with an action groove, a displacement groove on the inside of the conveying pipe with a displacement plate in the displacement groove, a movable block on one side of the displacement plate, an offset sleeve slidingly fitted on the outside of the conveying pipe, a linkage block on one side of the action plate with a linkage spring on one side of the linkage block, an adaptation block on the outside of the conveying pipe, a traveling plate on one side of the offset sleeve with a stepping plate, a stepping frame on one side of the adapter with a stepping rod in the stepping frame, a polygonal rod on the inside of the adapter, a sliding sleeve on the inside of the conveying pipe with a polygonal sleeve on the inside of the sliding sleeve, an adaptation sleeve on one side of the sliding sleeve, and multiple moving grooves on the outside of the conveying pipe. This utility model achieves flexible adjustment of the suction speed and intensity and ensures adsorption stability.

The application relates to the battery technical field and discloses a cover plate structure and a battery. The cover plate structure comprises: a plate body, which is provided with a pole mounting hole; a cantilever part is arranged around the pole mounting hole; a pole assembly is mounted in the pole mounting hole and abuts against the cantilever part; the surface of the cantilever part for supporting the pole assembly is a first surface of the cantilever part; the surface of the plate body on the same side of the first surface of the cantilever part is a first surface of the plate body; and the first surface of the cantilever part is lower than the first surface of the plate body in the direction perpendicular to the first surface of the plate body, thereby forming a staggered structure. The cover plate structure provided by the application realizes the thinning of the thickness of the cantilever part by making the first surface of the cantilever part lower than the first surface of the plate body, thereby reducing the material consumption in the forming process of the cantilever part, avoiding the uneven flow of the material in the extrusion forming process, and ensuring the uniform thickness of the cantilever part.

The utility model provides a booster pump which comprises a volute, a rotating impeller is arranged in the volute, the impeller comprises an upper cover plate and a lower cover plate, a liquid inlet is formed in the middle of the upper cover plate, a vertical conical cylinder is arranged in the middle of the lower cover plate, the upper end of the conical cylinder is arranged in the liquid inlet, Z-shaped blades are evenly distributed on the conical cylinder in the circumferential direction, and the lower end of the conical cylinder is connected with the volute. The lower ends of the Z-shaped blades are fixedly connected with the conical cylinder, the upper ends of the Z-shaped blades incline upwards and are connected with the inner wall of the upper cover plate, arc-shaped plates are arranged between the edges of the upper cover plate and the lower cover plate at intervals, and the arc-shaped plates correspond to the Z-shaped blades one to one. Through the arrangement of the Z-shaped blades and the conical cylinder, working liquid is guided and preliminarily pressurized, and then the working liquid enters the arc-shaped channel to be further pressurized, so that the pressurizing effect of the booster pump is improved, and the large outlet flow is realized.

This utility model relates to an embedded steel-clad wood-concrete composite beam, belonging to the field of composite beam technology. It includes a concrete slab with a trapezoidal groove extending along its length at the bottom. A wooden beam is positioned below the concrete slab, and the wooden beam has trapezoidal protrusions that mate with the groove, inserted into the groove. Several shear pins are arranged along the length of the wooden beam, fixing it to the upper part. An outer steel beam with a rectangular cavity is positioned below the concrete slab, and the wooden beam is embedded within this cavity. Two sets of barbed bolts are provided on the concrete slab, located on opposite sides of the trapezoidal groove. This utility model utilizes the compressive strength of steel and the tensile strength of wood in synergy, achieving efficient connection through mortise and tenon joints, pins, and bolts, enhancing overall load-bearing capacity and stability. It is suitable for large spans and negative bending moment areas, possessing excellent assembly adaptability and durability.

The invention discloses a foundation bottom sealing grouting construction method and structure of a jacket of a rear pile method booster station. The foundation bottom sealing grouting construction method comprises the steps that a first-time water fetching test procedure is carried out; sealing and grouting; a strength maintenance procedure; a secondary water fetching verification procedure and a formal grouting procedure. The structure is arranged in an annular space between a jacket pile leg and a steel pipe pile, and comprises a passive packer, a bottom sealing grouting pipe, a first grouting pipe, a drainage port and a grout overflow port, wherein a bottom sealing grouting layer formed by solidifying a quick-hardening grouting material is further formed above the passive packer, and the bottom sealing grouting layer and the passive packer form a composite grouting layer. By constructing a composite plugging system of the passive packer and the quick-setting bottom sealing grouting layer, even if the packer is damaged in the piling process, the bottom sealing layer can still provide effective sealing, the risks of sludge return and grouting leakage are fundamentally eradicated, and the cleanliness and the final strength of a grouting connection section are ensured.

This application provides a pallet device, a support device, a battery pack, and a workpiece processing method. The pallet device includes: a roll-formed pallet body having two first edges opposite each other along a first direction, the first edges extending along a second direction perpendicular to the second direction, a portion of the first edge protruding along the first direction to form a plurality of lifting parts, the plurality of lifting parts being spaced apart along the second direction; the pallet body having a plurality of first regions spaced apart along the second direction, the lifting parts being located at least in the first regions, a second region being provided between two adjacent first regions, the first regions and the second regions being connected by a first transition zone, the thickness T1 of the first region and the thickness T2 of the second region satisfying: T1 > T2. The pallet device of this application achieves lightweight design while meeting structural strength requirements.

The utility model relates to steel node technical field discloses a kind of auxiliary support connection steel nodes, including pre-burying mechanism, the upper and lower ends of the pre-burying mechanism are fixedly provided with column mechanism by the way of concrete pouring, the periphery of the pre-burying mechanism is fixedly provided with beam mechanism by the way of concrete pouring, the pre-burying mechanism includes first vertical plate, the middle position of the first vertical plate is fixedly provided with second vertical plate by the way of welding, the surface of the first vertical plate and second vertical plate is evenly spaced and provided with a plurality of through holes, the two sides of the first vertical plate and one side of the second vertical plate are evenly spaced and provided with a plurality of fixed bolts by screw thread setting. In the utility model, by applying it in small assembly type concrete beam-column structure, column is within three layers full-length column, solve the work that column of multistory building needs to be installed calibration on site in the process of traditional assembly type house construction, improve the practicability of the device.

The utility model discloses a water-cooling tool whole die for forging a tong head, and relates to the technical field of forging. The die comprises a die body, a plurality of sub-cooling mechanisms and a plurality of arc-shaped cushion blocks, an installation inner cavity is formed in the die body, an operation opening communicated with the installation inner cavity is formed in the peripheral side face of the die body, the areas, located above and below the operation opening, of the installation inner cavity form end cavities, the sub-cooling mechanisms are annularly installed in the installation inner cavity, and every two sub-cooling mechanisms are attached to each other. The separate cooling mechanism comprises a set of end shells, a middle shell and a cover plate, and the end shells are arc-shaped shells. A large number of sub-cooling mechanisms are designed, each sub-cooling mechanism independently cools the corresponding area, cooling modularization is achieved, all the modules can be independently controlled and are vertically arranged, the uniformity of the corresponding cooling area is high, the problem that uniformity is poor due to the fact that a water cooling channel is too long is solved, and the cooling efficiency is improved. The cooling effect and efficiency are improved, and the using effect and service life of the mold are ensured.

The utility model discloses a turbulence structure for plate heat exchanger belongs to heat exchange equipment field. The utility model adopts technical scheme for a turbulence structure for plate heat exchanger, including heat exchange plate, both sides of heat exchange plate are equipped with the flow guide cavity for medium flow, several groups turbulence flange that are spaced apart in the flow guide cavity along medium flow direction, form turbulence passage between adjacent turbulence flange, turbulence flange height is less than the depth of groove body, turbulence flange cross section is trapezoidal, the utility model discloses through setting the turbulence flange and turbulence passage of special shape, has increased the turbulence degree of medium, and the trapezoidal cross section of turbulence flange has strengthened the structural strength, and the design of turbulence passage also is convenient for cleaning incrustation, has the advantages such as improving heat exchange efficiency, strengthening structural strength and convenient for cleaning incrustation.

The application discloses a micro-pipe type liquid cooling heat exchanger and a production method thereof. The micro-pipe type liquid cooling heat exchanger comprises a shell, a cover and a plurality of micro-pipes. The cover is installed at the end of the shell. The cover comprises a cover seat, a first lining plate and a second lining plate. The cover seat comprises an abutting surface. The first lining plate and the second lining plate are stacked between the abutting surface and the shell. The first lining plate is located between the second lining plate and the abutting surface. The first lining plate is provided with a plurality of through holes. The second lining plate is provided with a plurality of through holes. The through holes are in one-to-one correspondence and are communicated. The outer diameter of the micro-pipe is larger than the through hole. The end of the micro-pipe extends into the through hole and is blocked and limited by the first lining plate. The application can meet the heat exchange demand of new energy vehicles.

This utility model discloses a fully open wearable stereo earphone, including a charging case, an inner tray, earphone bodies, an earphone fixing assembly, and a circuit assembly. The charging case includes an upper box body with a lower box body disposed on the upper box body. The inner tray includes an upper cover, a lower cover and a bonding piece disposed below the upper cover, with the bonding piece fixed to the upper and lower cover respectively. The earphone body is disposed on the earphone fixing assembly, which includes a storage block. A first earphone chamber and a second earphone chamber communicating with the first earphone chamber are disposed on the upper surface of the storage block. The circuit assembly includes a protective shell, which is a cavity structure with an opening at the top and a hollow interior, and has a mounting groove. This fully open wearable stereo earphone adopts a healthy sound solution, combining a wide sound field and a free and comfortable listening experience without intruding into the ears with the convenience of earphones, and does not produce sound leakage.

The invention belongs to the technical field of agricultural biology, and particularly relates to a method for improving verticillium wilt resistance of cotton, which comprises the following steps of: constructing a systematic process of disease-resistant single plant screening in a disease place, complex adding generation in south Hainan, disease nursery multi-generation directional breeding and strain double-path identification; physiological index verification and molecular assisted selection are combined, the breeding period is remarkably shortened to 3-5 years, and the cotton line with stable disease resistance and excellent agronomic characters is efficiently obtained.