43results about How to "Clean surface" patented technology

The invention discloses a preparation method of a high-orientation hydrophobic oxide antireflection film for a diamond infrared window, and belongs to the technical field of optical film preparation. The preparation method comprises the steps of diamond surface precision polishing, diamond surface acid boiling, magnetron sputtering and the like. According to the invention, the high-orientation oxide composite target material is adopted to prepare the high-orientation antireflection film, and a low-temperature and high-temperature alternate coating mode is adopted, so that the prepared antireflection film has the characteristics of slight hydrophobicity and high orientation; the synthesis process is good in process continuity and simple in synthesis process.

The utility model discloses an ash removal device for hollow brick processing, relates to the field of hollow brick processing, and solves the problems that an existing ash removal device adopts a brush for cleaning, hollow bricks with different lengths are difficult to clean by the brush, cleaning omission easily exists in the cleaning process, the ash removal work is difficult to complete in the actual use process, and the cleaning efficiency is high. The device comprises a bottom plate, a conveying assembly is fixedly installed at the top of the bottom plate, and a cleaning assembly is fixedly installed at the top of the bottom plate; and the cleaning assembly comprises an air compressor and a hose, the air compressor is fixedly installed at the top of the bottom plate, and the hose is fixedly connected with the output end of the air compressor. According to the hollow brick cleaning device, hollow bricks can be cleaned, so that the surfaces of the hollow bricks are cleaner, the hollow bricks can be cleaned repeatedly, the situation that residues exist is prevented, the surfaces of the hollow bricks are cleaner, harm of dust to respiratory tracts or eyes of workers is reduced, and the using effect is improved accordingly.

The outdoor environment cleaning robot suitable for the power transmission circuit comprises a plurality of power transmission cables, a supporting frame is placed at the tops of the power transmission cables, a connecting rope is connected to the top of the supporting frame, an unmanned aerial vehicle is connected to the other end of the connecting rope, and a plurality of cleaning assemblies are arranged at the bottom of the supporting frame. According to the scheme, inspection personnel do not need to climb to install the power transmission cables, use is convenient and flexible, the multiple cleaning assemblies are placed at the tops of the multiple power transmission cables at the same time, the moving stability of the robot is improved, and in the moving process, the cleaning assemblies are arranged at the tops of the power transmission cables, so that the cleaning efficiency of the robot is improved. According to the power transmission cable cleaning device, multiple power transmission cables can be cleaned at the same time, the cleaning efficiency of the power transmission cables is improved, entanglements are cut, the entanglements are broken on the power transmission cables so as to be separated from the power transmission cables, large entanglements can be cleaned, and potential safety hazards caused by the entanglements on the outer surfaces of the power transmission cables are avoided.

The invention discloses a process for preparing a V2O3 / ZnV2O3 total battery by simultaneously using vanadium oxide in a zinc ion battery as a positive electrode material and a negative electrode material, which comprises the following steps: reacting ammonium metavanadate with absolute ethyl alcohol by adopting a solvothermal synthesis method, washing, drying, and calcining in a tubular furnace to obtain V2O3; in the preparation process of the V2O3 positive electrode material, only V2O3, acetylene black serving as a conductive agent and PVDF serving as a binder are mixed in proportion and then are coated on graphite paper, other coating protection materials do not need to be introduced into a V2O3 / Zn negative electrode, and V2O3 is used as a protection layer to inhibit growth of zinc dendrites, relieve hydrogen evolution side reaction of the zinc negative electrode and reduce corrosion of zinc. Vanadium oxide V2O3 is directly used as a core positive electrode material, the zinc negative electrode coating is developed by utilizing the characteristics of the vanadium oxide V2O3, a material is formed, meanwhile, the performance optimization of the positive electrode and the negative electrode is realized, the used raw materials are simple and easy to obtain, the process is simple and easy to implement, and the preparation process is simple and easy to implement from V2O3 raw material synthesis to positive and negative electrode piece preparation to V2O3 / ZnV2O3 total battery assembly. And comprehensive improvement of positive and negative electrode performances of zinc ions is simultaneously realized by a single material.

The invention relates to the technical field of roll-dividing equipment, and particularly discloses a roll-dividing machine for an ultrathin narrow steel strip, which comprises a rack and further comprises an unwinding unit arranged on the rack, and the unwinding unit is used for unwinding the steel strip; the braking unit is used for making contact with the released steel belt and detecting whether the steel belt exists or not, and when it is detected that no steel belt exists, the unwinding unit is controlled to be braked; the burr scraping unit is used for scraping burrs on the two sides of the steel strip; the chip removing unit comprises a blowing pipe, and the blowing pipe is used for blowing air flow; the tension adjusting unit is used for adjusting the winding tension of the steel belt; and the rolling unit is used for rolling the steel belt. Burrs and chippings can be effectively removed, and it is guaranteed that the edge of the steel belt is smooth and the surface is clean.

The application discloses a kind of high tough AlSi10MgMn alloy and preparation method thereof, the composition of high tough AlSi10MgMn alloy includes: silicon 8.0~11.0%, magnesium 0.17~0.60%, manganese 0.2~0.6%, titanium 0.08~0.40%, boron 0.004~0.018%, strontium 0.3~0.6%, rare earth metal 0.1~0.3%, unavoidable impurity less than 1%, the balance is aluminum, the aforementioned percentage is mass percentage.The high tough AlSi10MgMn alloy of the application, surface neat, the mechanical properties such as tensile strength and elongation are significantly improved;Alloy grain is fine, dispersion uniform, no aggregation, no burning loss;Preparation method is simple and easy to operate.

The utility model discloses a clamping device for packing box processing, and relates to the technical field of clamping devices, the clamping device for packing box processing comprises a collecting box, the surface of the collecting box is fixedly connected with a filter screen, the surface of the collecting box is fixedly connected with a portal frame, and the surface of the portal frame is fixedly provided with a motor; a guide groove is formed in the surface of the portal frame, an output shaft of the motor is fixedly connected with a two-way threaded rod, the two-way threaded rod is rotationally connected with the inner wall of the guide groove, the surface of the two-way threaded rod is in threaded connection with a guide block, the guide block is slidably connected with the inner wall of the guide groove, and the surface of the guide block is fixedly connected with a guide block. The surface of the fixing plate is fixedly connected with a clamping plate, cleaning cotton slides downwards to clean the surface of the packaging box, then when the packaging box is used subsequently, the surface of the packaging box is cleaner and tidier, and then foreign matter and dust are prevented from being attached to the surface of the packaging box.

The utility model discloses a ventilation pipeline cleaning device which comprises a main body assembly, a cleaning assembly and a cleaning assembly. The camera is fixed on the top surface of the movable rod; the protection assembly comprises a set of supporting rods, a movable plate, a sliding groove and a sliding block. The supporting rods are fixed to the top ends of the movable rods, the movable plate is movably connected between the top ends of the inner sides of the supporting rods, the sliding grooves are formed in the two sides of the movable plate, and the sliding blocks are slidably connected into the sliding grooves. The pipeline cleaning device aims to solve the problems that when an existing pipeline is cleaned, a cleaning device needs to be placed in the pipeline, then a worker operates the cleaning device from the outside, the cleaning device in the pipeline cleans the pipeline, meanwhile, the worker observes the cleaning condition in the pipeline through a camera on the cleaning device, and during cleaning, the cleaning device is not convenient to clean. And dust and other sundries in the pipeline can cover the camera shooting position of the camera, so that the camera shooting picture is fuzzy.

The utility model belongs to the technical field of mechanical equipment, and particularly relates to a hand-operated magnet tension testing machine which comprises a magnet tension testing machine and rotating shafts, the bottom of the magnet tension testing machine is fixedly connected with a base, and the rotating shafts are symmetrically and rotatably connected to the outer walls of the two sides of the base. Cleaning blocks are symmetrically assembled on the top of the base in a sliding mode, a rotating shaft is fixedly connected with a dust cover through a first connecting rod, rotating plates are fixedly connected to the two ends of the rotating shaft and located in the base, and one end of one rotating plate is fixedly connected with a second connecting rod. The base of the magnet tension testing machine is protected through the rotatable dustproof cover, dust and other impurities are prevented from being accumulated on the base, the cleaning block can be driven to clean the surface of the base through opening and closing of the dustproof cover, the surface of the base is cleaner, the magnet and the base are better attracted, the accuracy of measured numerical values is ensured, and the service life of the magnet tension testing machine is prolonged. Time and labor are saved.

The utility model relates to the technical field of inclined plate sedimentation tanks, in particular to a solar power supply system for an inclined plate sedimentation tank. The device comprises a solar power supply device. The solar power supply device comprises a solar panel assembly, a corner assembly, a rotating assembly and a track assembly, the track assembly is mounted at the top of the inclined plate sedimentation tank through a mounting frame, one ends of the rotating assembly and the corner assembly are connected with the top of the track assembly, and the other ends are hinged to the solar panel assembly; the rotating assembly rotates to drive the solar panel assembly and the corner assembly to rotate around the axis of the rotating assembly along the outer contour line of the track assembly along with movement of the sun, and the corner assembly can drive the solar panel assembly to change the included angle between the solar panel assembly and the horizontal plane. Through the corner assembly, the rotating assembly and the track assembly, the front face of the solar panel assembly can face the sun, the solar energy absorption efficiency of the solar panel assembly is improved, and environmental pollution is prevented from being aggravated.

The invention discloses polymethylsilane capable of regulating and controlling the C / Si atomic ratio and a preparation method and application thereof.The preparation method comprises the steps that metal sodium is cut and crushed, and metal sodium fragments are obtained; adding the metal sodium fragments into an organic solvent, and heating until the metal sodium is in a molten state to obtain a mixture; stirring and cooling the mixture to obtain a sodium sand mixture; mixing methyl dichlorosilane, allyl methyl dichlorosilane, tetrahydrofuran and 15-crown ether-5, and then dropwise adding the mixture into the sodium sand mixture to react; the sodium sand in the preparation method has the characteristics of uniform particle size, high activity and clean surface; tetrahydrofuran and 15-crown ether-5 are added into dichloromethylsilane and allyl methyldichlorosilane, so that the single electron transfer rate of metallic sodium to dichloromethylsilane can be increased, the reaction activation energy can be reduced, the reaction efficiency can be improved, the molecular structure can be optimized, the loss of carbon elements can be made up, and the problem that PMS is rich in silicon after pyrolysis can be solved.

The invention relates to the technical field of detection, and provides aluminum alloy B-type cabin intermediate product precision detection equipment which comprises an operation table, a detection mechanism, a dust removal mechanism, a cleaning mechanism and a drying mechanism. The left side of the upper end of the operation table is fixedly connected with the detection mechanism, and the right side of the operation table is fixedly connected with the dust removal mechanism; the right end of the rear side of the operation table is fixedly connected with a cleaning mechanism, the left end of the rear side of the operation table is fixedly connected with a drying mechanism, and arc-shaped T-shaped transverse baffles are evenly distributed at the upper end of the operation table. Through the cooperation of the operation table and the detection mechanism, the precision of automatically and continuously detecting the arc-shaped T-shaped transverse baffle is achieved, the arc-shaped T-shaped transverse baffle needing to be detected only needs to be manually placed at the upper end of the arc-shaped clamping base at the right end of the front side, then the detected arc-shaped T-shaped transverse baffle is taken down from the upper end of the arc-shaped clamping base at the left end of the front side, and the detection efficiency is greatly improved. The difficulty of precision detection is reduced, the detection precision is high, and the efficiency is high.

The utility model discloses a microfiber synthetic leather air permeability modifying device, and particularly relates to the technical field of synthetic leather production, the microfiber synthetic leather air permeability modifying device comprises a milling cutter head, a machine body, a synthetic leather polishing assembly and a dye pool, a feed port is formed in the center of the left side of the machine body, a discharge port is formed in the center of the right side of the machine body, and the synthetic leather polishing assembly is arranged on the right side of a guide roller; the dye pool is arranged on the right side of the body inner cavity; the synthetic leather polishing assembly is used for polishing the two faces of the microfiber synthetic leather, the fiber structure of the microfiber synthetic leather is strengthened, gaps among fibers are increased, air circulation is promoted, the surface structure of the microfiber synthetic leather is more uniform, dirt and impurities on the surface of the leather are removed, the surface becomes smoother, the dyeing process is more uniform, and the quality of the microfiber synthetic leather is improved. The surface of the synthetic leather is coated with the cleaning agent, the pore openness of the surface of the synthetic leather is increased, the adsorption performance of dye is improved, adsorption and attachment of a dyeing coating are facilitated, a good foundation is provided for subsequent dyeing work, and dust attached to the surface of the synthetic leather is removed through the ultra-long brush.

The utility model discloses a continuous casting machine roller bed clean lubrication integrated device relates to mechanical casting technical field, including mounting bracket, one side rotation connection has the roller bed body between the mounting bracket, the lower extreme of one side between the mounting bracket is provided with the two -way threaded rod, and the upper end of two -way threaded rod is provided with the cleaning mechanism for wiping the outside of roller bed body, the cleaning mechanism includes movable block, and movable block is connected in the outside of two -way threaded rod with screw, the top of movable block is articulated to have articulated link, and the top of articulated link is installed with the cleaning brush through the fixed box. This continuous casting machine roller bed clean lubrication integrated device, through the fixed link of moving can exert certain pressure to extrusion plate, thereby making extrusion plate will evenly to elastic gasbag exert the inference, making the lubricating oil in the inside of elastic gasbag is extruded and sprays from the oil nozzle place through the hose, and the oil nozzle can guide lubricating oil to carry out lubrication treatment to the outside of roller bed body.

The utility model discloses a sampling device for coal germanium ore geological exploration, which belongs to the technical field of geological exploration and comprises a support frame, a movable plate is lapped in the support frame, a sampling barrel is arranged in the movable plate, a threaded sleeve is arranged on the sampling barrel, a screw rod is in threaded connection with the inside of the threaded sleeve, a conical stop block is lapped in the sampling barrel, and the conical stop block is in threaded connection with the inside of the threaded sleeve. Two telescopic rods are arranged in the sampling barrel, and the bottom ends of the telescopic rods are connected with the conical baffle block. According to the sampling device for geological exploration of the coal germanium ore, through the arrangement of the sampling barrel, the rotating disc, the lead screw, the telescopic rod and the conical stop block, under the mutual cooperation of the sampling barrel, the rotating disc, the lead screw, the telescopic rod and the conical stop block, the situation that part of shallow soil is not mixed into sample soil is further avoided; and meanwhile, the upper soil is blocked by the conical baffle block, so that the geological exploration error is greatly reduced, the geological exploration result is more accurate, the operation is simple and convenient, and the overall practicability is greatly improved.

This invention relates to the field of molecular sieve technology, specifically to a SAPO-34 molecular sieve, its preparation method, and its applications. The preparation method includes: aging, pre-crystallization, and crystallization of a gel containing an aluminum source, tetraethylammonium hydroxide, a silicon source, a phosphorus source, and water; wherein the aging temperature is 40-80℃, and the aging time is 4-12 h; the pre-crystallization temperature is 90-130℃, and the pre-crystallization time is 2-24 h; and the crystallization temperature is 180-210℃, and the crystallization time is 24-50 h. The SAPO-34 molecular sieve prepared by this invention has a nanometer-sized particle size, uniform morphology, clean surface, high regularity, and the preparation operation is simple and environmentally friendly.

This invention provides a roll packaging machine, relating to the field of packaging film sealing and cutting technology. It includes a sealing and cutting packaging machine, a second sealing and cutting mechanism, a third sealing and cutting mechanism, and a separating and transporting mechanism. The sealing and cutting packaging machine includes a feeding platform, a film feeding mechanism, a pushing mechanism, a first sealing and cutting mechanism, and a discharge and transporting mechanism. The film feeding mechanism wraps the packaging film around the outside of the roll material. The pushing mechanism pushes three roll materials placed on the feeding platform onto the discharge and transporting mechanism. A second sealing and cutting mechanism is located on both the left and right sides of the discharge and transporting mechanism, and a separating and transporting mechanism is located on the side of the discharge and transporting mechanism furthest from the sealing and cutting packaging machine. Through this technical solution, three roll materials placed side-by-side can be independently sealed each time, improving packaging efficiency.

This invention provides a method and apparatus for laser debonding, belonging to the field of semiconductor technology. The method includes the following steps: providing a temporary bonding body for a wafer, the temporary bonding body comprising a silicon carrier, an interposer, a carbon-rich thin film, a bonding layer, and a wafer stacked together; in a vacuum environment, irradiating the temporary bonding body with an infrared pulsed laser, causing interface peeling at the carbon-rich thin film, thus completing the laser debonding between the silicon carrier and the wafer. This invention uses a carbon-rich thin film as the laser release layer, reducing costs. It possesses broad-spectrum, high-efficiency absorption characteristics in the infrared laser band, enhancing laser scattering and light-trapping effects, and improving laser energy absorption efficiency. By performing laser debonding in a vacuum environment, impurities such as microparticles generated during interface peeling can be removed from the cavity, avoiding wafer contamination and interference with the laser path, thus improving the cleanliness, stability, and overall device yield of the debonding process.

The utility model belongs to the technical field of flushing devices, and particularly relates to an efficient flushing device for a municipal water supply network pipe, which comprises a flushing device, an inner groove is arranged in the flushing device, a circular plate is arranged on the side surface of the inner wall of the inner groove, and a fence is arranged on the surface of the circular plate; an inner plate is installed on the surface of the inner wall of the inner groove, and a clamping groove is formed in the inner plate. When the surface of the water supply net pipe is cleaned, the water supply net pipe needs to be arranged in the circular plate and the fence, the telescopic rod connected with the power source is started, the telescopic rod pushes the brush plate on the inner wall of the arc plate to be connected with the fence, and meanwhile the flushing device connected with the power source is started; the water supply net pipe in the fence is driven to rotate while the circular plate rotates, and the surface of the water supply net pipe in the fence is cleaned by the brush plate, so that cleaning of the surface of the water supply net pipe can be completed, and the cleaned surface of the water supply net pipe is cleaner and tidier.

The utility model discloses a plate cutting machine, which relates to the field of plate cutting and comprises a working table, a motor is mounted at the lower end of the working table, a dust collection component is mounted on the left portion of the upper end of the working table, a U-shaped frame is mounted on the rear portion of the upper end of the working table, and a rotatable supporting plate is mounted on the front portion of the upper end of the working table. An XZ moving part is installed on the upper wall of the U-shaped frame, a box body is installed at the lower end of the XZ moving part, an organ cover is installed at the lower end of the box body, a cutting part is installed at the front end of the box body, and two sets of fixing parts which are symmetrically distributed front and back are installed at the upper end of the supporting plate. The working efficiency can be improved through the cooperation of the supporting plate, the motor and the fixing part, plates can be continuously cut, the idle time of the cutting part waiting for loading and unloading of the plates is shortened, the productivity is improved, and dust generated by cutting can be absorbed through the cooperation of the dust collection part, the box body and the organ cover.

The invention belongs to the technical field of substrate edge grinding, and particularly relates to a flexible self-adaptive substrate edge grinding machine of a printing head. Comprising a workbench, an XYZ three-axis module, a rotating shaft R, a plate conveying belt line, a primary alignment mechanism which is arranged on the plate conveying belt line and aligns an A side, a secondary alignment mechanism which aligns a B side and aligns twice so as to eliminate an error that the two sides of a substrate are not parallel, namely the widths of the two ends are not consistent, and a grinding wheel mechanism (double grinding wheels, a diamond grinding sheet and a spraying assembly). According to the automatic edge grinding device, manual operation is converted into automation, a base plate is positioned by a first push plate through conveying of a first belt, then the base plate is subjected to 45-degree edge grinding of 0.10 + / -0.05 mm through combination of an X / Y / Z three-axis module and an organ suction nozzle and action programming, the base plate is put back to the first belt after edge grinding is completed, and the base plate is subjected to automatic edge grinding. Automatic feeding is carried out while the edged substrates are conveyed out of the working range through the first belt, and no manual operation is needed to directly participate in edging operation in the whole process.

The invention relates to hard film anti-rust oil and a preparation method thereof. The hard film anti-rust oil comprises the following raw materials: base oil, a film-forming agent, a plasticizer and an anti-rust agent, the film-forming agent comprises rosin, and the plasticizer comprises dodecanol. The hard film anti-rust oil contains rosin and dodecanol at the same time, the rosin and the dodecanol are compounded, high adhesive force brought by polar groups of the rosin is reserved, the flowability of molecular chains is improved through long-chain alkyl of the dodecanol, and the bending performance is improved while the high adhesive force of a film layer is kept. In addition, conjugated double bonds in the rosin are easy to oxidize and yellow under the action of illumination and oxygen, so that the appearance of the film becomes poor; long-chain alkyl of dodecanol can wrap rosin molecules, contact between the rosin molecules and air and ultraviolet rays is reduced, and through an accelerated aging test, the yellowing degree of a mixed system is reduced to 3.2 or below from 8.5 of pure rosin.

The invention discloses circuit board processing equipment and a processing method thereof, and particularly relates to the technical field of circuit board processing, the circuit board processing equipment comprises a mounting plate, a fixing plate is fixedly connected to the front side of the top of the mounting plate, a vibration structure is arranged in the mounting plate, and a cleaning structure is arranged on the rear side of the fixing plate. A fixing structure is arranged above the mounting plate, the vibrating structure and the cleaning structure are arranged, the vibrating structure can make corrosive liquid act on the surface of the circuit board more evenly, the corrosion rate is increased, and meanwhile the phenomenon of uneven corrosion is reduced. The cleaning structure can effectively remove residues which are not corroded on the surface of the circuit board, the cleanliness of the circuit board is ensured, possible problems in follow-up machining are avoided, the circuit board can be stably fixed in the machining process by arranging the fixing structure, the machining precision is ensured, and the machining efficiency is improved. Therefore, the circuit board does not displace in the corrosion and cleaning process.

This utility model relates to the field of cast-in-place pile construction technology, specifically disclosing a reinforcing bar fixing device for cast-in-place piles. The device includes a steel formwork, which is circular in shape. Several sets of limiting rods are welded circumferentially to the top of the formwork, extending radially inwards towards the inside of the formwork. Limiting rings are welded to the ends of the limiting rods furthest from the formwork. Main reinforcement sleeves are fitted onto each set of limiting rods, and two limiting clamps are engaged at the top of the sleeves. This utility model ensures accurate positioning of the main reinforcement bars after pile head removal, and that the protective layer meets design requirements. It also ensures accurate pile diameter and top elevation after excavation and pile head removal, preventing damage to the pile head. Furthermore, it ensures straight and clean reinforcing bars after the pile head concrete is removed, guaranteeing the quality of the reinforcing bar construction.

The invention relates to a photovoltaic panel-adjustable photovoltaic power supply device and method, and relates to the related field of photovoltaic power generation, the photovoltaic panel-adjustable photovoltaic power supply device comprises a photovoltaic panel body, a support is fixed at the bottom of the photovoltaic panel body, the photovoltaic panel-adjustable photovoltaic power supply device further comprises a mounting plate, a supporting piece is fixed on the mounting plate, a transmission disc is arranged at the top of the supporting piece, a limiting ring is coaxially fixed on the transmission disc, and the limiting ring is fixed on the mounting plate. The transmission disc is rotationally connected with a limiting groove formed in the top of the supporting piece through a limiting ring, an adjusting assembly is installed on the transmission disc and connected with the support, a transmission assembly is installed in the supporting piece and connected with the adjusting assembly and a driving assembly, and the driving assembly is installed on the installation plate. The driving assembly is connected with the transmission disc, the pitching angle is adjusted while the driving assembly rotates to adjust the direction, and on the premise that programming (continuous one-way output) of the driving assembly is not conducted, adjustment along with the sun in the daytime and adjustment back to the initial state at night can be achieved.

The invention discloses a coupled biomass-based nano generator with both PENG and TENG and a preparation method of the coupled biomass-based nano generator. Belongs to the technical field of nano-generators. By regulating PVDF-HFP and regenerated cellulose molecular chains to form inter-chain hydrogen bonds,-F chemical bonds with huge electronegativity in regenerated cellulose / PVDF-HFP can provide a good triboelectric effect, meanwhile, added KNN nano-particle filler can be effectively loaded in a regenerated cellulose matrix, good piezoelectric performance is provided, and the piezoelectric effect is good. And the prepared nano generator has excellent piezoelectric and frictional electricity output performance. According to the invention, the idea is simple and clear, the KNN nanoparticle filler is added into the regenerated cellulose, the electrical output performance is further enhanced, and the prepared coupled biomass-based nano generator with both PENG and TENG has sufficient environmental friendliness and has wide application prospects.

The invention relates to a direct patterning method of a two-dimensional material, which comprises the following steps of: aligning and loading a quartz mask with a metal pattern layer and a substrate on which the two-dimensional material is uniformly distributed to obtain a substrate-mask assembly; ultraviolet light is utilized to excite oxygen to generate ozone to etch the substrate-mask assembly, and then direct patterning of the two-dimensional material is completed. The invention provides a direct patterning solution which can be compatible with an existing semiconductor production line and is suitable for various two-dimensional material systems, and a reliable process basis is provided for application of two-dimensional materials in high-performance electronic devices.

The utility model discloses a beef fascia removing device with rolling blade mechanism, including frame, the inner wall bottom of frame is placed with the material collecting frame, the inside of frame is equipped with the blanking mechanism, and the blanking mechanism includes motor, pivot, gear, hobbing blade roller and blanking roller, one side of frame is rotatably connected with two pivots and extends to the pivot outside frame, and the gear of mutual meshing connection is fixedly installed to one end of two pivots outside frame, and the outer ring of one pivot is fixedly installed with hobbing blade roller. Through the hobbing blade roller will drive the beef fascia that removes to continue to rotate, when the beef fascia on hobbing blade roller passes blanking roller, at this moment, the beef fascia that will stick to its surface is removed under the rotation of blanking roller, and then is collected through the material collecting frame, thereby avoiding its stick on hobbing blade roller, and causing pollution, thereby can remove the beef fascia that sticks to the surface of hobbing blade roller, and make its surface more clean.

This invention discloses a method for preparing polymethylsilane. The method includes cutting and crushing metallic sodium to obtain sodium fragments; adding the sodium fragments to an organic solvent and heating to a molten state to obtain a mixture; stirring and cooling the mixture to obtain a sodium sand mixture; mixing dichloromethylsilane, tetrahydrofuran, and 15-crown ether-5 and then adding the mixture dropwise to the sodium sand mixture for reaction, followed by cooling, solid-liquid separation, and distillation. This preparation method obtains a sodium sand product with uniform particle size, high activity, and clean surface by rapidly cooling after high-temperature dispersion of metallic sodium in a specific organic solvent system. By adding tetrahydrofuran and 15-crown ether-5 to dichloromethylsilane, the single electron transfer rate of metallic sodium to dichloromethylsilane can be increased, the activation energy of the reaction can be reduced, and the reaction efficiency can be improved. Furthermore, the continuous dropwise addition saves reaction time.

The utility model discloses a fine chemical engineering screening device, which relates to the technical field of screening devices and comprises a processing pipeline, a screening component is arranged in the processing pipeline, a layering component is arranged at one end of the processing pipeline, a plurality of storage boxes are fixedly mounted at the bottom of the processing pipeline, and the screening component comprises a small screening filter cartridge, a medium screening filter cartridge and a large screening filter cartridge. The layering assembly comprises a rotating shaft, a first baffle and a second baffle, when the rotating shaft rotates, particles of different sizes enter different storage boxes through the small screening filter cartridge, the medium screening filter cartridge and the large screening filter cartridge through the first baffle and the second baffle, a stirring assembly is arranged on the outer wall of the rotating shaft, and the stirring assembly comprises a stirring plate and an electrostatic plate; when the stirring plate rotates, the electrostatic plate can be driven to rotate, and when the electrostatic plate rotates, fine impurities in the chemical particles can be adsorbed, so that the probability that the impurities are adhered to the surfaces of the small particles and cannot be discharged in time is reduced, and the screening effect is further improved.