338results about How to "Not easy to fail" patented technology

The invention discloses a photovoltaic module, a preparation method and a welding tool, and relates to the technical field of photovoltaic modules. The photovoltaic module comprises one or more battery strings, each battery string comprises a plurality of battery pieces, a plurality of high-temperature welding strips and a plurality of low-temperature welding strips, and the high-temperature welding strips and the low-temperature welding strips are connected with the battery pieces in series. Each battery piece is provided with a plurality of first main grids; each high-temperature welding strip is connected in series with two corresponding first main grids of two adjacent battery pieces; and each low-temperature welding strip is arranged between the two adjacent first main grids on the battery pieces and is connected with the two adjacent battery pieces in series. According to the embodiment, the high-temperature welding strip and the low-temperature welding strip are arranged in the photovoltaic module at the same time, and part of the main grids in the battery piece are reserved, so that the purposes of reducing the silver paste cost and the gram weight of an adhesive film can be achieved, and the problem that the photovoltaic module is prone to failure in the outdoor long-term operation process is solved.

The invention belongs to the technical field of road engineering materials, and discloses a wide-temperature-range crack pouring adhesive based on rubber modified asphalt and a preparation method thereof.The wide-temperature-range crack pouring adhesive is prepared by taking the rubber modified asphalt as a matrix through a response surface method and adding SBS, basalt fibers and a modifier. The performance of the material is tested through a conventional test, and meanwhile, a test with more characteristics in northeast regions is provided, and the performance of the material is detected through injection depth, viscosity, low-temperature stretching after aging and freeze-thaw cycle stretching. Results show that a test designed by a response surface method has very strong reliability, and the modified heating type crack pouring adhesive added with the basalt fiber can significantly improve the high and low temperature performance of the crack pouring adhesive, and also has good anti-aging performance and freeze-thaw cycle resistance. And the filling depth and the viscosity of the sealant are not obviously lower than those of the same type of sealant.

The invention relates to a shoe material and a manufacturing method thereof, in particular to a folding-resistant laminated plate, a sole, a shoe and a laminated plate manufacturing method. The folding-resistant laminated plate comprises a middle layer group and a carbon fiber layer, the middle layer group comprises a basalt fiber layer, and the laying angle of the basalt fiber layer is 0 or 90 degrees; or the middle layer group comprises at least two basalt fiber layers which are stacked in sequence, and the laying angles of every two adjacent basalt fiber layers are 0 degree and 90 degrees respectively; or the middle layer group comprises two basalt fiber layers, and the laying angles of the two basalt fiber layers are 90 degrees. The sole and the shoe both comprise the folding-resistant laminated plate. The carbon fiber layers are compounded on the two sides of the middle layer, and the laying angle of the basalt fiber layer in the middle layer is limited, so that rigidity attenuation after multiple times of bending can be slowed down, the bending resistance is improved, meanwhile, the ductility of the laminated plate can be improved, brittle failure is avoided, and the structure is not prone to failure.

The invention belongs to the technical field of lithium ion batteries, and discloses an amidated polyacrylic acid water-based polymer binder for a silicon-based negative electrode of a lithium ion battery and a preparation method and application of the amidated polyacrylic acid water-based polymer binder for the silicon-based negative electrode of the lithium ion battery. The preparation method comprises the following steps: under a protective atmosphere, sequentially adding 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride, N-hydroxysuccinimide and levodopa, stirring to fully react, carrying out dialysis freeze-drying treatment to obtain a primary product PL, and uniformly mixing the PL with glycerol to obtain the product. According to the binder, a dynamic bond is successfully introduced, the transportation efficiency of lithium ions is improved, a three-dimensional network structure is constructed, adverse stress generated by volume expansion of a SiOx negative electrode material in the charging and discharging process of an electrode can be effectively inhibited, and the SiOx negative electrode shows good cycling stability.

The invention discloses a magnetic control silicon-based adhesive as well as a preparation method and application thereof. The magnetic control silicon-based adhesive is prepared from the following components in parts by weight: 60 to 70 parts of silane modified polyurethane, 15 to 25 parts of a silane coupling agent, 40 to 60 parts of a magnetic nano material, 15 to 45 parts of microcrystalline silicon, 25 to 40 parts of nano calcium carbonate, 5 to 15 parts of titanium dioxide, 5 to 10 parts of talcum powder, 10 to 15 parts of amino silane, 3 to 8 parts of color paste and 1 to 4 parts of a catalyst. The silane modified polyurethane, the magnetic nano material and the microcrystalline silicon are reasonably compounded, so that the obtained adhesive not only has good adhesive force, but also has excellent water resistance and aging resistance, the introduction of the magnetic nano material not only can be matched with electromagnetic equipment to realize remote repair, but also can improve the curing capacity of the adhesive, so that the adhesive has a good application prospect. And the microcrystalline silicon enables the chemical properties of the adhesive to be more stable, and can meet the building repair requirements in various complex environments.

The pot seedling transplanter comprises a seedling feeding mechanism, a seedling clamping mechanism and a seedling planting mechanism, the seedling feeding mechanism is driven by a motor and provided with a dial, a plurality of notches are formed in the periphery of the dial, and when the notches rotate to an induction area of a first sensor, the first sensor sends out a signal enabling the motor to stop rotating to finish one-time seedling feeding; the seedling clamping mechanism comprises a seedling clamping cylinder rotationally mounted on the pivot, a plurality of pairs of seedling clamps are mounted on the seedling clamping cylinder, one end of the seedling clamping cylinder is connected with a signal disc, an induction part is arranged on the signal disc, and when the induction part rotates to an induction area of a second sensor, the second sensor sends out a signal for enabling the motor to rotationally feed seedlings. Mechanical seedling clamping and electric seedling feeding are adopted, the speed is high, accuracy is achieved, the structure is simple, the production cost is low, faults are not prone to occurring during operation, and the duckbilled seedling planting mechanism is adopted, so that the pot seedling transplanter can be universally suitable for dry land crops such as vegetables, cotton and tobacco.

The invention relates to the technical field of non-woven fabrics, in particular to a hydrophobic non-woven fabric and a preparation method thereof.The preparation method comprises the steps that perfluorodecanethiol and octavinyl polysilsesquioxane are used as raw materials to react to generate fluorine-containing polysilsesquioxane, then the fluorine-containing polysilsesquioxane is dispersed in an ethanol solution to form a hydrophobic modified solution, and the hydrophobic modified solution is added into the hydrophobic modified solution to prepare the hydrophobic non-woven fabric. Fluorine-containing polysilsesquioxane molecules in the hydrophobic modification solution not only have the organic-inorganic hybridization characteristic of polysilsesquioxane, but also contain hydrophobic groups of perfluorodecanethiol, so that the hydrophobic modification solution has excellent hydrophobic performance, the antibacterial non-woven fabric with the surface coated with silver-loaded chitosan is subjected to impregnation modification, and the antibacterial non-woven fabric with the surface coated with perfluorodecanethiol has excellent antibacterial performance. According to the present invention, with the silver-loaded chitosan, the fluorine-containing polysilsesquioxane molecules can be adsorbed and attached to the surface of the non-woven fabric to form the compact hydrophobic layer, the good antibacterial property of the non-woven fabric can be maintained due to the existence of the silver-loaded chitosan, and the chemical bond formed by the fluorine-containing polysilsesquioxane and the surface of the non-woven fabric is stable so as to achieve the good antibacterial property; the modified non-woven fabric keeps stable hydrophobic performance and antibacterial performance.

The invention provides a method for improving the thickness of an oxide on the side wall of a deep trench, and the method comprises the steps: providing a substrate, forming an epitaxial layer on the substrate, and sequentially forming a pad oxide layer, an etching stop layer, a polycrystalline silicon layer and a hard mask layer on the epitaxial layer; a photoresist layer is formed on the hard mask layer, the exposure focal length is adjusted to open the photoresist layer so as to define the forming position of the deep groove, the exposed hard mask layer is opened through etching to form an opening pattern, the side wall of the opening pattern is in an inclined shape, and the section of the opening pattern is in a trapezoid shape with the wide upper portion and the narrow lower portion; a deep groove is formed through etching, and the remaining photoresist layer is removed; forming a thermal oxide layer on the side walls of the polycrystalline silicon layer and the deep trench by using a thermal oxidation method, wherein the thermal oxide layer at the side wall of the polycrystalline silicon layer is in a convex shape; etching the thermal oxide layer to enable the thermal oxide layer to be reserved on the side wall of the deep groove; and forming a filling layer for filling the residual deep groove by using a deposition and grinding method. The method can improve the thickness of the oxide layer on the side wall of the deep trench.

The invention belongs to the technical field of electroacoustics, and particularly relates to a vibrating diaphragm of a sound production device and the sound production device. The vibrating diaphragm of the sound production device comprises at least one phenyl silicone rubber layer, the phenyl silicone rubber layer contains a network polymer, and the phenyl silicone rubber layer is formed by curing liquid phenyl silicone rubber compound. The liquid phenyl silicone rubber compound comprises methyl phenyl vinyl polysiloxane, methyl phenyl vinyl silicone resin and phenyl hydrogen-containing silicone oil. According to the vibrating diaphragm with the phenyl silicone rubber layer, the bonding force between the vibrating diaphragm and a shell and between the vibrating diaphragm and a voice coil can be remarkably improved, and meanwhile, phenyl hydrogen-containing silicone oil and methyl phenyl vinyl polysiloxane have good compatibility, so that the phenyl silicone rubber layer is better in curing uniformity, more balanced in mechanical property and not prone to failure; in addition, the vibrating diaphragm has high damping performance, THD distortion of the vibrating diaphragm can be remarkably reduced, and the vibrating diaphragm has better acoustic performance.

The utility model discloses a transportation pulling rope quick connecting device which comprises a steel wire mesh sleeve, a locking piece and a clamping sleeve, the diameter of the steel wire mesh sleeve is matched with that of a transportation pulling rope, the locking piece is a hollow cylinder with the wall thickness not smaller than 2mm, the inner diameter of the locking piece is larger than the sum of the outer diameter of the transportation pulling rope and the double diameter of a steel wire of the steel wire mesh sleeve, and the clamping sleeve is connected with the steel wire mesh sleeve. The outer circle surface of the jacket is smooth, the two ends of the jacket are chamfered, a through threaded hole is formed in the center of the cylindrical surface of the jacket, the inner diameter of the jacket is smaller than the outer diameter of a transportation traction rope, the steel wire mesh sleeve can freely penetrate through the jacket in the initial state, the outer circle surface of the jacket is smooth, the two ends of the jacket are chamfered, and the two ends of the inner circle are subjected to arc guiding treatment. The clamping sleeve enables the steel wire mesh sleeve to radially contract towards the middle when the steel wire mesh sleeve is tensioned, the friction force between the steel wire mesh sleeve and a transportation traction rope is increased, and the effect that the steel wire mesh sleeve is tensioned more and more tightly is achieved. Due to the fact that the steel wire mesh sleeve is large in flexibility, the steel wire mesh sleeve can smoothly pass through a winch without causing deformation and damage at the joint.

The invention provides an aluminum alloy, a preparation method of the aluminum alloy and a motor rotor, the aluminum alloy comprises the following components in percentage by mass: 0.38-0.60% of Si, not more than 0.15% of Fe, not more than 0.05% of Cu, not more than 0.05% of Zn, 0.005-0.01% of Ti, not more than 0.03% of Ga, 0.01-0.1% of Sm, 0.005-0.05% of Er, 0.5-0.8% of Mg and the balance of Al and other elements, the total amount of the other elements is less than 0.1%, and the single content of the other elements is less than 0.01%. According to the aluminum alloy provided by the invention, the high-temperature yield strength of the aluminum alloy can be improved on the premise of keeping good conductivity through reasonable proportioning of all the element components, and when the aluminum alloy is used for preparing the motor rotor of the electric vehicle, the obtained motor rotor can run for a long time under the conditions of high rotating speed and high acceleration and is not prone to deformation or failure.

The invention relates to the technical field of batteries, and particularly discloses a battery cover plate assembly and a battery, and the battery cover plate assembly comprises a connecting block and a pole. One end of the pole penetrates through the connecting block and then is riveted with the first step surface of the first sinking table, the end, riveted with the first step surface, of the pole expands towards the periphery to form a riveting part, a seam is formed between the peripheral side wall of the riveting part and the first side wall of the first sinking table, and the seam of the riveting part and the first side wall of the first sinking table is welded to form a welding part. Wherein the diameter of the riveting part is d1, the distance between the center line of the welding part and the peripheral side wall of the riveting part is n, and the relation between n and d1 meets the condition that n / d1 is larger than or equal to 0.0125 and smaller than or equal to 0.025. By improving the welding structure between the pole and the connecting block, the connecting strength between the pole and the connecting block is relatively high, the over-current capability is good, and the performance of the battery cover plate assembly is relatively good. The invention also provides a battery which comprises the battery cover plate assembly.

The invention discloses a mining air-leakage-stopping flame-retardant anti-static spraying foaming material and a preparation method thereof, and relates to the technical field of spraying foaming materials, the mining air-leakage-stopping flame-retardant anti-static spraying foaming material comprises a first component and a second component, the first component comprises the following raw materials in parts by weight: polyether polyol, a flame retardant, a catalyst, a foam stabilizer, an antistatic agent, a filler, a plasticizer and a foaming agent; the second component is prepared from the following raw materials in parts by weight: diisocyanate, a plasticizer, a flame retardant and filler. Efficient anti-static is achieved through the modified conductive graphite, and the problem that a traditional antistatic agent is poor in compatibility is solved; the flame retardant property is remarkably improved by adopting an efficient flame retardant composition, and spontaneous combustion in a high-temperature environment is prevented; the combination of polyether polyol and diisocyanate is optimized, so that the compressive property and the mechanical strength are improved; and low-temperature reaction reduces potential safety hazards, construction is convenient, and various conditions are adapted. The material effectively solves the problems of insufficient anti-static, flame-retardant and compression-resistant properties, and provides safe and reliable technical guarantee for underground coal mines.

The utility model provides a battery and electric equipment, and relates to the field of batteries. A battery includes a battery cell and a support. The battery monomer comprises a shell and a pressure relief component, the shell comprises a first wall part, and the pressure relief component is arranged on the first wall part. The pressure relief part comprises a first groove, and the pressure relief part is configured to be capable of cracking along the first groove when the battery monomer is subjected to pressure relief. The supporting piece supports the first wall part and is provided with a supporting face facing the first wall part, and the supporting face is provided with an avoiding part. The projection of the first groove is located in the avoiding part in the thickness direction of the first wall part. The avoiding part is arranged on the supporting piece, and the projection of the first groove in the thickness direction of the first wall part is located in the avoiding part, so that the avoiding part can avoid the first groove, the supporting piece is not easy to abut against the outer side of the first groove when the battery monomer is subjected to pressure relief, the cracking of the first groove is not easy to inhibit, and the service life of the battery monomer is prolonged. Therefore, the first groove can crack in time when the battery monomer is decompressed, and the reliability of the battery is improved.

The utility model provides a battery monomer, a battery and electric equipment, and relates to the field of batteries. The battery cell includes a housing having a first wall and a pressure relief member. The pressure relief component is arranged on the first wall, the pressure relief component comprises a first weak part, the first weak part defines a preset pressure relief area, and the pressure relief component is configured to be capable of cracking along at least one part of the first weak part when the battery monomer is subjected to pressure relief. The pressure relief component further comprises a second weak part, and the second weak part is configured to guide at least one part of the preset pressure relief area to turn over so as to open at least one part of the preset pressure relief area. Each battery monomer is provided with a first weak part and a second weak part, and when the pressure of the battery monomer is released, the first weak part is cracked, so that a fluid medium in the battery monomer flows out to release the pressure. By arranging the second weak part, the predetermined pressure relief area can be turned over and opened under the guidance of the second weak part, so that the opening speed of the predetermined pressure relief area is favorably improved, quick pressure relief is realized, and the reliability of the single battery is favorably improved.

The utility model discloses an integrated vibration transmitter. The periphery of a transmitter assembly is wrapped by a heat shrink tube, so that a better insulation effect is realized; the height of the heat shrink tube is not lower than the height of a printed circuit board at the top of the transmitter assembly, and gaps among all parts of the transmitter assembly in the heat shrink tube are filled with silica gel, so that the problem of deformation or displacement of electronic components caused by original epoxy resin packaging can be solved, and external impact can be buffered to better protect the electronic components; meanwhile, the length, reserved below the bottom of the transmitter assembly, of the heat shrink tube is smaller than the radius of the bottom of the transmitter assembly, so that part of the central area of the bottom of the transmitter assembly cannot be completely wrapped by the heat shrink tube, and epoxy resin is filled between the area and the shell to guarantee good vibration transmission performance; and finally, epoxy resin is encapsulated between the heat shrink tube and the shell until the position near the height of the encapsulation opening on the shell, so that the integrated vibration transmitter which is high in pressure resistance, good in use performance and resistant to impact is formed.

The invention relates to the technical field of semiconductors, in particular to a silica gel packaging power module of a novel chip bonding point reinforcing process scheme. Comprising a chip; the back surface of the chip is arranged in a conductive copper layer power circuit etching region of the insulating ceramic substrate, and the front surface of the chip is connected to the conductive copper layer power circuit etching region of the insulating ceramic substrate through a bonding wire to form a power loop; and the reinforcing layer is arranged on the bonding points on the front surface of the chip. According to the invention, the bonding point is coated with the reinforcing layer, and the bonding point is cured and reinforced, so that in a power cycle reliability tolerance experiment with higher chip junction temperature and larger temperature change, the bonding point is less deformed under the constraint of the reinforcing layer and is subjected to relatively small stress, and the bonding and binding with the chip are less prone to failure. Therefore, the application of higher junction temperature resistance of the module can be improved, the power cycle or temperature cycle resistance of the bonding and binding process is higher, and the reliability of the module is improved.

The utility model discloses a new energy charging pile with electric leakage detection, which relates to the technical field of new energy charging piles and comprises a charging pile assembly and a winding assembly arranged on one side of the charging pile assembly, a charging gun component is arranged on one side of the winding assembly, a drying assembly is arranged in the charging pile assembly, and the charging pile assembly comprises a pile body. A through opening groove is formed in one side of the pile body, a protection plate is arranged on one side of the through opening groove, heat dissipation opening grooves are evenly distributed in the middle of the protection plate, the drying assembly comprises a heating plate component fixedly installed in an inner cavity of the pile body, the heating plate component is provided with an installation cavity groove box, and a second motor is arranged on one side of the installation cavity groove box. By means of the arrangement, the problem that an existing new energy charging pile is affected by the humid environment when the new energy charging pile is located outside for a long time is solved through the drying assembly, the pile body can be dried at any time, the problem that the charging pile is likely to break down is solved, and the practicability of the device is improved.

The invention discloses a high-stability lithium ion battery electrolyte which comprises the following raw materials: LiPF6, ethylene carbonate, dimethyl carbonate and an additive. Compared with the traditional electrolyte, the electrolyte prepared by the method provided by the invention has good stability, and can maintain a high battery capacity retention rate after 100 cycles, thereby improving the use performance and durability of the battery.

The invention relates to an unmanned aerial vehicle rotor wing with a super-hydrophobic microstructure on the surface and a forming method thereof, aiming at the unmanned aerial vehicle rotor wing, the unmanned aerial vehicle rotor wing comprises a porous curved plate, and the surface of the porous curved plate is densely covered with holes and is used as a core material of the rotor wing; the micron-sized rough surface structure layer is made of a thermoplastic composite material, covers the surface of the porous curved plate and serves as a surface layer of the rotor wing; the reinforcing body is made of a thermoplastic composite material, the holes of the porous curved plate are filled with the reinforcing body, and the reinforcing body and the micron-sized rough surface structure layer are integrally formed. The forming method for the rotor wing of the unmanned aerial vehicle comprises the following steps that S1, stamping and shaping operation is executed, and S2, cleaning operation is executed; s3, executing surface activation treatment operation; s4, injection molding operation is executed, and a micro mold is used for wrapping the porous curved plate subjected to the previous operation; and a carbon fiber grid layer or a glass fiber grid layer is wound and fixed on the surface of the porous curved plate. The unmanned aerial vehicle rotor surface solid-liquid separation device is beneficial to unmanned aerial vehicle rotor surface solid-liquid separation and ice prevention.

The invention discloses hectorite composite antibacterial and antioxidant hydrogel and a preparation method and application thereof.The preparation method comprises the steps that hectorite is dispersed in deionized water to obtain dispersion liquid, zwitterionic monomers are added, the dispersion liquid is adsorbed on the surface of hectorite through the interaction between ions, and a zwitterionic monomer-hectorite compound is prepared; adding the zwitterionic monomer-hectorite compound, a main monomer, a cross-linking agent, an initiator and a catalyst into water, fully stirring to obtain a precursor solution, and cross-linking and curing to obtain double-cross-linked hectorite composite hydrogel; the preparation method comprises the following steps: preparing a functional polymer deionized water solution, adding inorganic copper salt, carrying out ultrasonic dispersion, adding EGCG, carrying out a reaction, carrying out centrifugal separation on a final product, washing, and carrying out freeze drying to prepare an EGCG-Cu nano complex; and immersing the bi-crosslinked hectorite composite hydrogel into a deionized water solution of an EGCG-Cu nano complex to fully swell the hydrogel layer, taking out the hydrogel layer, and carrying out vacuum drying to obtain the EGCG-Cu nano hydrogel. The hydrogel material provided by the invention can realize the wound dressing with antibacterial and antioxidant properties at the same time.

The invention provides a regenerated graphite composite negative electrode material, a preparation method of the regenerated graphite composite negative electrode material and a secondary battery. The preparation method of the regenerated graphite composite negative electrode material comprises the following steps: firstly, placing waste graphite in a strong alkali solution for pore-forming treatment to obtain porous regenerated graphite; then, in an inert atmosphere, depositing silane gas on the surface and in pores of the porous regenerated graphite to obtain a composite material; and mixing and granulating the composite material, a binder and a conductive agent, and performing post-treatment to obtain the regenerated graphite composite negative electrode material. According to the preparation method of the regenerated graphite composite negative electrode material provided by the invention, the regenerated graphite composite negative electrode material with relatively high gram volume, cycling stability and fast charging performance can be prepared.

The utility model relates to the field of door locks, in particular to an anti-jamming integrated door lock. Comprising a mounting panel; the lock cylinder is mounted on the mounting panel, and the lock cylinder comprises a shifting piece; the lock body is slidably arranged on the mounting panel, the upper end of the lock body is propped against the shifting piece, and a spring bolt is arranged at the lower end of the lock body; the rotating handle is rotationally arranged on the mounting panel; the square rod is arranged on the rotating handle and rotates together with the rotating handle; a locking groove is formed in the limiting disc, and the limiting disc is arranged on the square rod in a sleeving mode; the reset device is arranged in the lock groove; the first reset spring is used for enabling the limiting disc to return to the initial position; wherein the shifting piece is rotated to enable the lock body to move downwards, and at the moment, the spring bolt is inserted into the lock groove; according to the utility model, the lock body and the rotary handle directly form a mechanism locking relationship, so that the whole forms a group of structures, the structure is simpler, and faults are not easy to occur.

The utility model discloses a photovoltaic system and a buckle cover type waterproof structure thereof, which belong to the field of photovoltaic technology and comprise a waterproof buckle cover arranged at a gap between two adjacent photovoltaic assembly frames. The waterproof buckle cover comprises a water retaining part which shields right above the gap, a buckle part which extends downwards from the water retaining part and is inserted into the gap, and a sealing part which extends from the water retaining part to two opposite sides of the gap and covers the A surface of the photovoltaic module frame, and the buckle part is buckled and fixed with the B surface of the photovoltaic module frame. And a sealing rubber strip is arranged between the sealing part and the A surface of the photovoltaic module frame. According to the waterproof cover plate, a small gap between the sealing part and the A surface is secondarily blocked through the sealing rubber strip, the waterproof reliability is improved, and therefore compared with a conventional waterproof cover plate, the waterproof cover plate can greatly improve the waterproof effect.

The present invention discloses an integrated multifunctional fuel filter, which comprises a cylinder, a filter element which divides the cylinder into a lower crude oil side and a lower clean side, a mounting cover which is arranged on the upper end of the cylinder, a partition plate which divides the inner side of the mounting cover into an upper crude oil side and an upper clean side, and an exhaust valve which is arranged in the upper crude oil side and is used for controlling the on-off of the upper crude oil side and the upper clean side. The exhaust valve can automatically complete the exhaust of the upper crude oil side, effectively improve the combustion efficiency of the engine, and has a certain auxiliary effect on the emission.

The utility model relates to the technical field of automobile awning sunshade curtains, and discloses a clip for an automobile awning sunshade curtain, which comprises an inner support arm, the anti-falling part is positioned at the root part of the inner supporting arm; the supporting part is connected with the anti-falling part; the magnet mounting part is positioned below the supporting part, and a magnet is arranged in the magnet mounting part; and the outer supporting arm is connected with the magnet mounting part. The utility model has the beneficial effects that the structure is more symmetrical, and the stress is easier to balance.

The invention relates to the technical field of soilless culture, and particularly discloses a vegetable soilless culture seedling culture and a seedling culture method thereof, and the seedling culture method of the vegetable soilless culture seedling culture comprises the following steps: cleaning and disinfecting vegetable seeds, soaking the vegetable seeds in a soaking solution, carrying out dark treatment, planting the vegetable seeds in a soilless culture substrate, and culturing to obtain vegetable seedlings. The soilless culture substrate comprises a solid substrate and a liquid substrate, the solid substrate comprises modified rock wool, modified perlite and gravel, and the liquid substrate comprises vegetable crop rotten vegetables, a leavening agent, brown sugar, a PH regulator and a heavy metal ion chelating agent. The vegetable soilless culture substrate prepared by the invention is good in water-retaining property, has a certain prevention and treatment effect on diseases and insect pests, and can solve the problem of heavy metal pollution in seedling culture, and the seedling culture method used by the invention has the advantages that vegetable seeds are high in germination rate, strong in disease and insect pest resistance and good in growth state.

The utility model discloses a two -dimensional code protection device, it includes the fixed plate, the fixed plate one side is provided with the flip, the fixed plate with the hinge between the flip is hinged, the fixed plate inside is provided with two -dimensional code inlay groove, the fixed plate inside is provided with one number and places the groove, the fixed plate with the inside four corners symmetry of flip is provided with a plurality of limit hole, the limit hole inside all are fixedly connected with magnet, one number and places the groove inside fixed connection one rubber strip, the two -dimensional code inlay groove with limit hole between being provided with the protection groove, the protection groove inside fixed connection has no.

This invention discloses a vertical cylinder double eccentric ball joint linkage vacuum check valve and method. The check valve includes a valve body, double eccentric valve discs, a valve stem, a valve cover, a vertical cylinder, and a valve disc shaft support. The valve body has a valve seat hole, and the double eccentric valve discs are rotatably mounted on the valve body via the valve disc shaft. An arc-shaped contact surface is integrally formed on the outer side of the valve discs. Balls are embedded at the bottom of the vertically arranged valve stem, and the balls roll in contact with the arc-shaped contact surface. The valve cover is sealed and fixed to the upper end of the valve body. The vertical cylinder is vertically mounted on the valve cover, and its piston rod is rigidly connected to the valve stem coaxially. The valve disc shaft support is symmetrically fixed to the valve body and supports the valve disc shaft. This solution uses a vertical cylinder coaxial drive combined with ball rolling transmission, eliminating the traditional hard top pressure friction and significantly reducing the opening and closing resistance. The double eccentric valve discs rotate stably, and the closing response speed is faster, effectively solving the defects of slow valve closing and severe seal wear in traditional check valves. The overall assembly is stable and suitable for the long-term airtight operation requirements of industrial negative pressure vacuum systems.

A board edge fixing terminal of a circuit board is used to fix the circuit board on a main board, and comprises: a base, a buckle spring arm, a first limiting arm and a second limiting arm, wherein the base is fixed to the main board and has a first side and two second sides, and the first side and the two second sides correspond to the first board edge and the second board edge of the circuit board respectively; the buckle spring arm is connected to the first side and has a buckle part; the first limiting arm and the two second limiting arms are connected to the first side and the two second sides respectively; wherein the buckle part corresponds to the buckle first board edge, the first limiting arm limits the first board edge, and each second limiting arm limits each second board edge respectively. In this way, the convenience and quick use effect of being able to use without assembly, and the effect of not being easy to fail, damage and having a high yield can be achieved.