31results about How to "Has a dual role" patented technology

The invention discloses a post-poured hidden coping construction method for converting simply supported beam into continuous beam. Plate girders are precast in a plant, are then connected with precast plate girders at two sides thereof via cast-in-situ copings so as to convert the precast plate girders into continuous beams, wherein the method of combining supports is adopted to carry out construction, in the method, a temporary support for installing the precast plate girders and a formwork support for installing the post-poured hidden copings are combined to be one, thus obtaining excellent effect.

The invention discloses a method and an apparatus for laser shock processing of a weldment at an ultralow temperature and aims to improve mechanical properties and corrosion resistance of a weldment through laser shock processing of the weldment at an ultralow temperature. According to the invention, the weldment is disposed in liquid nitrogen at an ultralow temperature, and the colorless transparent liquid nitrogen is used as a low temperature auxiliary environment and as a restraint layer for laser shock processing; thus, on the one hand, the apparatus for laser shock processing at an ultralow temperature is simplified, and on the other hand, laser shock processing of the weldment at an ultralow temperature is realized and the weldment serves at a same temperature, which guarantees consistency of the processing environment and the service environment of the weldment and thus enabling toughness, corrosion resistance and other mechanical performances of the weldment at an ultralow temperature to be improved.

The invention discloses an adjustable lifting cloth storage rack, which comprises a cloth storage rack upper frame, a cloth storage rack lower frame, a telescopic cylinder and sliding rods. Four corners of the cloth storage rack upper frame and four corners of the cloth storage rack lower frame are provided with supports; the sliding rods are vertically arranged on the supports and support the cloth storage rack upper frame and the cloth storage rack lower frame; upper guide roller groups are parallelly arranged on the cloth storage rack upper frame; lower guide roller groups are parallelly arranged on the cloth storage rack lower frame; and the adjustable lifting cloth storage rack is provided with an adjusting mechanism which comprises a driving steel roller, a driving device in drive connection with the driving steel roller, and a pinch rubber roller matched with the driving steel roller; the lower parts of the lower guide roller groups of the cloth storage rack lower frame are provided with at least two guide rollers; the lower part of the cloth storage rack upper frame is provided with a connecting piece; and the cloth storage rack lower frame is detachably connected with the connecting piece. Therefore, the positions of the cloth storage rack upper frame and the cloth storage rack lower frame can be adjusted, so that thin films are stressed uniformly and extended flatly.

The invention belongs to the technical field of civil engineering and discloses a combined multifunctional steel bar cage manufacturing framework and manufacturing method. The combined multifunctionalsteel bar cage manufacturing framework comprises a framework body, a main rib positioning plate and bearing beams. The framework body is provided with arc moulding beds matched with a steel bar cageto be manufactured; the main rib positioning plate rolls in a matching manner or is slidably supported on the moulding beds, main rib placing grooves are distributed in the main rib positioning plate,and main ribs of the steel bar cage are matched in the main rib placing grooves; and the bearing beams are used for supporting and steadying the steel bar cage in a welding process. The combined multifunctional steel cage manufacturing framework is reasonable in design, steady in support, convenient for machining and rapid in disassembly and assembly, not only can be used in a machining shed, butalso can be used nearby a construction site and a pile site for directly hoisting the steel bar cage or steel bar framework to be directly in position.

The invention discloses an ERD + coal saturated steam catalytic combustion denitration device. The ERD + coal saturated steam catalytic combustion denitration device comprises a decomposing furnace, wherein a secondary air inlet is formed in the bottom of the decomposing furnace, and connected with a cement rotary kiln; the decomposing furnace comprises a reduction zone, a main burning zone, a reburning zone and a burning-out zone from the bottom up, a reduction zone saturated steam catalytic combustor and a reburning zone saturated steam catalytic combustor are respectively mounted in the reduction zone and the reburning zone; the reduction zone saturated steam catalytic combustor and the reburning zone saturated steam catalytic combustor are connected with a steam flow metering device, the steam flow metering device is connected with a steam surge tank, the steam surge tank is connected with a steam main pipe, the main burning zone and the burning-out zone are respectively connected with tertiary air and over-fire air, and are oxygen enriched combustion zones, to ensure that pulverized coal of the system is burnt out. The invention further discloses an ERD + coal saturated steam catalytic combustion denitration technique, and has the advantages of high denitration efficiency, simple and easily operated technological process, low operation cost, high system stability, optimized clinker production technology, energy-saving and consumption-reducing effects and the like.

The invention discloses a smart Internet of Things cloud monitoring service system for a roller shutter door. The system comprises a monitoring detector which monitors state information of a roller shutter door in real time. The monitoring detector is connected with a roller shutter door monitoring server. The roller shutter door monitoring server is in communication connection with a network monitoring server, a cell phone intelligent network device monitoring server and a roller shutter door network monitoring center server through a wireless transmission module. The system has real-time monitoring and early-warning functions, and can give an alarm in time, and a terminal is simple in structure and small in size, and can be taken along, thereby facilitating monitoring. Monitored information can be transmitted to a monitoring service center, and the monitoring center performs cloud storage on relevant information so as to evaluate risks of normal operation of the roller shutter door. According to the system, through network technology and communication facilities, the alarm has dual functions, and alarm reliability is improved.

The invention provides an efficient compound anti-swelling oil displacement agent, which is prepared from following raw materials in percentage by weight: 30 to 50 percent of polyacrylamide, 15 to 30 percent of dichloroethane, 10 to 15 percent of sodium octylbenzenesulfonate, 5 to 20 percent of potassium alginate, 1 to 5 percent of NaOH and 5 to 15 percent of KCl. The oil displacement agent of the invention has rich raw material sources, less energy consumption, low cost, high oil displacement efficiency and comprehensive mechanization, and has double effects of inhibiting clay swelling and improving displacement efficiency. In the oil displacement by using the 0.8 percent oil displacement agent of the invention, the recovery ratio of crude oil can be improved by 15 to 25 percent, and continuous injection-production of a water injection well can be ensured. The efficient compound anti-swelling oil displacement agent has the advantages of low Kraff point, high lime soap dispersing performance and wetting ability, capacity of emulsifying the crude oil and high adaptability. The invention also provides a method for preparing the oil displacement agent.

The invention discloses a ceramic pot structure. The structure comprises a pot body and a pot cover, two symmetrical pot ears are arranged at the outer side wall of the pot body, a section of arc inserting groove is formed in the pot edge of the left side of the pot body, a vertical inserting groove is formed in other pot edge of the pot body, an arc inserting plate and a vertical inserting plate matched with the arc inserting groove and the vertical inserting groove in positions and sizes are arranged at the edge of the bottom of the pot cover, a material adding pipe is arranged at the left side of the pot cover, a seasoning hopper is connected to the upper portion of the material adding pipe, the lower portion of the material adding pipe penetrates through the pot cover, a penetrating baffle inserting groove is formed in the left side wall of the material adding pipe, a baffle is aslant inserted into the baffle inserting groove downward, the most right end of the baffle abuts against the inner wall of the material adding pipe, and a cross rod perpendicular to the baffle is arranged at the left end of the baffle. Through the ceramic pot structure, the leakproofness of a ceramic pot is improved, seasonings are convenient to add, and the pot cover is convenient to place and cannot drip water.

The invention provides a full automatic water dispensing system. The system comprises a water storage tank and a water trough, and the water trough is arranged below the water storage tank; the system further comprises a control device, a cold water pump and a heating device, the control device and the cold water pump are arranged on the end portion of the water trough respectively, and the heating device is connected with the water storage tank; a far infrared sensing module, a transmission unit, an electric control unit, a pressure reduction module and a power supply module are arranged in the control device; the far infrared sensing module senses moving of surrounding domestic animals and feeds signals back to the transmission unit, then the transmission unit feeds the information back to the electric control unit, and finally the signals are directly fed back to a water level controller; the transmission unit receives and uploads data, so that the data is subjected to processing, analyzing and cleansing; the electric control unit receives and processes the signals and controls switching-on of the water pump and the water level. According to the full automatic water dispensing system, a solar heating device and a heating element are utilized to enable the system to normally run in sunny days and rainy days respectively, and the water dispensing system is safe, clean and high in automation degree.

The invention discloses a method for gasification of fluidized bed gasified fly ash retaining to a furnace, and belongs to the technical field of comprehensive utilization of coal carbon. According tothe fluidized bed gasification method, firstly, fly ash collected by a gas dust removal system of fluidized bed gasifier is mixed with a catalyst, then the fluidized bed gasified fly ash is transported to the fluidized bed gasifier in a jet flow mode by using an oxygen-containing airflow; a combustion reaction or a gasification reaction of the gasified fly ash occur in a dilute phase area of thefluidized bed gasifier, and gas is produced or heating is provided for the gasification reaction; and at the same time, coal for gasification is transported from the middle lower part of the fluidizedbed gasifier to the gasifier, and partial oxidation and the gasification reaction occur between the coal and a gasification agent in the gasifier. The method can realize furnace retaining gasification of the circulating fluidized bed gasified fly ash, the process is simple, the gasification effect is good, and the problem of utilization of the fly ash of an enterprise is solved.

The invention discloses a toothpaste composition with effects of promoting discharge of heavy metal and improving immunity. The toothpaste composition comprises the following raw material components in percentages by mass: 0.1-3% of vitamin C magnesium ascorbyl phosphate, 0.1-3% of calcium glycerophosphate, 0.1-3% of licorzinc, 0.1-3% of selenium carrageenan and the balance of toothpaste substrate. The toothpaste has a certain discharge promoting effect on heavy metal accumulated in human bodies due to environmental pollution, and further can improve immunity, and people can be away from harmcaused by heavy metal pollution while oral cleaning and nursing are implemented.

The invention discloses a MOFs (metal organic frameworks) material for a cigarette filter and a preparation method and application of the MOFs material. The MOFs material for the cigarette filter is prepared by taking terephthalic acid and metal oxides or metal hydroxides as raw materials, adding an activator, and by performing a light irradiation process in a DMF (dimethyl formamide) solution through one-step photochemistry synthesis. The MOFs material disclosed by the invention not only is capable of achieving efficient adsorption of toxic gases in cigarette smoke, but also achieves the purpose of catalytic degradation of the toxic gases, has dual roles, and thus is capable of effectively reducing the harm of cigarettes to human bodies.

The invention discloses a mold for manufacturing an obstructing and explosion suppression ball. The mold comprises a first seat plate, a second seat plate, a fixed mold mechanism, a movable mold mechanism, an ejecting mechanism, a cooling mechanism, a filling mechanism, a limiting mechanism, a resetting mechanism, an exhaust mechanism and a fixing mechanism; the fixed mold mechanism and the movable mold mechanism are arranged between the first seat plate and the second seat plate, an explosion suppression ball space for injection molding arranged in the inner part is of a thin-walled frameworkstructure, the ejecting mechanism ejects the explosion suppression ball, a sleeve barrel with magnetorheological fluid is additionally arranged on the resetting mechanism to actively control the displacement of a movable mold, the impact of vibration on an injection molding workpiece is reduced, the problems of complex structure, difficult manufacturing, low efficiency and high replacement rate of an explosion suppression filler are solved, and the advantages that the surface quality of the produced explosion suppression ball is smooth, shrinkage defects are eliminated, the wall surface can be thinner, the mass is less, the volume is small, and output is stable are achieved.

The invention discloses an adjustable lifting cloth storage rack, which comprises a cloth storage rack upper frame, a cloth storage rack lower frame, a telescopic cylinder and sliding rods. Four corners of the cloth storage rack upper frame and four corners of the cloth storage rack lower frame are provided with supports; the sliding rods are vertically arranged on the supports and support the cloth storage rack upper frame and the cloth storage rack lower frame; upper guide roller groups are parallelly arranged on the cloth storage rack upper frame; lower guide roller groups are parallelly arranged on the cloth storage rack lower frame; and the adjustable lifting cloth storage rack is provided with an adjusting mechanism which comprises a driving steel roller, a driving device in drive connection with the driving steel roller, and a pinch rubber roller matched with the driving steel roller; the lower parts of the lower guide roller groups of the cloth storage rack lower frame are provided with at least two guide rollers; the lower part of the cloth storage rack upper frame is provided with a connecting piece; and the cloth storage rack lower frame is detachably connected with theconnecting piece. Therefore, the positions of the cloth storage rack upper frame and the cloth storage rack lower frame can be adjusted, so that thin films are stressed uniformly and extended flatly.

The invention belongs to the field of two-dimensional material preparation, and particularly relates to a method for preparing a large-size single-crystal two-dimensional material based on chemical vapor deposition. The method comprises the steps that carrier gas A and carrier gas B are mixed to serve as current-carrying gas, a near-flat micro-convex temperature field is constructed by setting a ratio of the carrier gas A to the carrier gas B, then a flat temperature field is constructed by adjusting the ratio of the carrier gas A to the carrier gas B, and then, the large-size single-crystal two-dimensional material is obtained through chemical vapor deposition, wherein the carrier gas A is inert gas, and the carrier gas B is gas different from the carrier gas A in thermal conductivity. According to the invention, gases which do not participate in the chemical reaction of the two-dimensional material and have different thermal conductivities are introduced into a reaction chamber, so interaction between substances is enhanced, the temperature field in the reaction chamber is effectively regulated and controlled, the conversion from the convex temperature field to the flat temperature field in the growth area of the two-dimensional material is designed and realized, the temperature driving force is fully provided; and thus, transverse growth of a two-dimensional material core is promoted, and finally, the high-quality large-size single-crystal two-dimensional material is obtained.

The invention discloses a self-shielding cold-insulation direct-current high-temperature superconducting current-limiting cable which comprises a cooling channel, a cable skeleton, a semiconductor layer, a superconducting layer, an insulating layer and a protective layer. The cooling channel is located in the center of the cable skeleton, the semiconductor layer is arranged outside the cable skeleton, and a superconducting odd layer n is arranged outside the semiconductor layer; a superconducting even number layer 2n is arranged outside the superconducting odd number layer n, the semiconductorlayer and the insulating layer are sequentially arranged between the superconductive odd-number layer n and the superconductive even-number layer 2n from inside to outside, and the protective layer is arranged on the outermost superconducting layer. The current running directions of the superconductive odd-number layer n and the superconductive even-number layer 2n are opposite, and the strip winding directions are the same. The current running directions of the adjacent superconductive odd-number layer n and the superconductive even-number layer 2 (n + 1) are the same, and the strip windingdirections are opposite. The self-shielding cold-insulation direct-current high-temperature superconducting current-limiting cable of the scheme has the advantages of dual functions of transmission and current limiting, self-shielding and no electromagnetic interference, does not need to connect a superconducting current limiter, and enables the device cost and the operation and maintenance cost to be reduced.

The present invention relates to a kind of preparation method of α-azide aryl ketone derivative, this method is by adding substituted styrene, azidotrimethylsilane and oxidizing agent in Schlenk reaction bottle, then add water as solvent again, at a certain temperature , stirring and reacting under an oxygen atmosphere to obtain the azidation / oxidation product α-azide aryl ketone derivative.

The invention discloses a knife sharpener. The knife sharpener comprises a shell formed by splicing a first half shell and a second half shell, the shell comprises a knife sharpening part and a handlepart, the first half shell and the second half shell are positioned and fixed through a positioning column structure, and the positioning column structure comprises a first positioning column, a second positioning column, a third positioning column and a fourth positioning column; the knife sharpener further comprises a first knife sharpening support arranged on the first positioning column and the fourth positioning column in a sleeving mode, a second knife sharpening support arranged on the second positioning column and the third positioning column in a sleeving mode, a first knife sharpening strip and a second knife sharpening strip, and the first knife sharpening support and the second knife sharpening support are distributed in a crossed mode to form an X-shaped included angle structure capable of clamping a knife edge; a first rail groove is formed in the upper end of the first knife sharpening support, a first spring cavity is formed in the lower end of the first knife sharpening support, and a first spring is arranged in the first spring cavity; and a second rail groove is formed in the upper end of the second knife sharpening support, a second spring cavity is formed in the lower end of the second knife sharpening support, and a second spring is arranged in the second spring cavity.

The invention discloses a channel type and static heating combined fuel oil heating structure. The channel type and static heating combined fuel oil heating structure comprises a middle vertical platewith an arc-shaped horizontal section, wherein the surface of the side, facing the circle center of the fuel oil heating structure, of the middle vertical plate serves as the inner surface, and the surface of the other side serves as the outer surface; an inner heat dissipation plate and an outer heat dissipation plate are fixedly connected to the inner surface and the outer surface of the middlevertical plate in an attached mode, an upper support plate is connected to the top end of the middle vertical plate, a lower support plate is connected to the lower end of the middle vertical plate,and the upper support plate and the lower support plate are used for being connected with the inner surface of a shell of the fuel filter in a pressing mode, so that a gap is formed between the outerheat dissipation plate and the inner wall of the shell of the fuel filter, the shell is prevented from being heated directly, heat dissipated to the outside is reduced, and the fuel oil heating efficiency is improved. After the channel type and static heating combined fuel oil heating structure is adopted, a heating mode of combining channel type heating and static heating is realized, the heatingefficiency is higher, the energy loss is little, fuel oil at a channel is heated more uniformly, the fuel oil at the channel and static fuel oil are both heated, and the filter resistance when the fuel oil passes through a filter layer is reduced to the maximum extent while the energy is saved.

The invention discloses a toothpaste composition with effects of promoting discharge of heavy metal and improving immunity. The toothpaste composition comprises the following raw material components in percentages by mass: 0.1-3% of vitamin C magnesium ascorbyl phosphate, 0.1-3% of calcium glycerophosphate, 0.1-3% of licorzinc, 0.1-3% of selenium carrageenan and the balance of toothpaste substrate. The toothpaste has a certain discharge promoting effect on heavy metal accumulated in human bodies due to environmental pollution, and further can improve immunity, and people can be away from harmcaused by heavy metal pollution while oral cleaning and nursing are implemented.

The invention discloses a preparation method of 3-hydroxymethyl-4-phenyl-3,4-dihydroquinolinone compound. The method uses acetonitrile as the reaction medium, and potassium monopersulfate promotes the epoxidation of N-methyl-N-aryl-2-phenylacrylamide-intramolecular Friedel-Crafts alkylation series reaction to generate 3-hydroxymethyl ‑4‑phenyl‑3,4‑dihydroquinolinone compound; the method has the advantages of mild conditions, simple operation, environmental protection, easy access to raw materials, excellent compatibility of substrate functional groups, and high reaction yield.

The invention relates to the technical field of air conditioners, in particular to an auxiliary heat dissipation structure, an air conditioner and a control method.The auxiliary heat dissipation structure comprises an air guide channel located in the air conditioner, an air outlet of the air guide channel points to a to-be-cooled element, an air inlet of the air guide channel points to a water collecting tank, and the water collecting tank is connected with a water receiving disc of evaporator condensate water; an atomizer is arranged in the water collecting tank, an induced draft fan is arranged in the air guide channel, an air outlet of the induced draft fan is located in one side of an air outlet of the air guide channel, and the auxiliary heat dissipation structure combines the draught fan for blowing air and condensate water to dissipate heat of a to-be-cooled element and supplement and cool the heat dissipation element and has the advantage of being high in heat dissipation stability.

The invention discloses a post-poured hidden coping construction method for converting simply supported beam into continuous beam. Plate girders are precast in a plant, are then connected with precast plate girders at two sides thereof via cast-in-situ copings so as to convert the precast plate girders into continuous beams, wherein the method of combining supports is adopted to carry out construction, in the method, a temporary support for installing the precast plate girders and a formwork support for installing the post-poured hidden copings are combined to be one, thus obtaining excellenteffect.

The invention relates to a box culvert jacking construction method and a construction device, comprising an angle-adjustable bow slope mounted at the front end of a box culvert, an adjustable pulley arranged between the top of the box culvert and a head-up beam of an original line, a jack of the angle-adjustable bow slope, a steel bow slope and a triangular structure formed at the front end of the box culvert, the bottom face of the installed steel bow slope inclines upwards, an inclination angle is formed between the bottom face and the horizontal plane, and the hydraulic synchronous control system controls the jacks to eject or retract to change the inclination angle of the steel bow slope. The adjustable tackle comprises a vertical jack and a tackle body fixed above the vertical jack, a pulley of the tackle body makes contact with the transverse lifting beam, and the hydraulic synchronous control system changes the height of the adjustable tackle body by controlling the vertical jack to act. The device not only can automatically adjust the gradient of the bow slope to prevent the phenomenon of head pricking or head raising during box culvert jacking, but also can protect the top of the box culvert from damaging an original line, and has double functions.

The invention discloses a side-entering type force increasing mud cutting mechanism. Before the side-entering type force increasing mud cutting mechanism works, the position of suspension is adjusted,and then the suspension is fixed with a fixing screw. A mud cutting cylinder acts, a piston rod of the mud cutting cylinder retreats, a sliding block moves upwards, a knife rack is pulled up by a pulling rod, a stop block presses downwards a force increasing spring, energy is stored, then a conveying belt is started, a combination of a support plate and a mud column is put onto the conveying belt, and the conveying belt drives the mud column to move forwards. When meeting with a position sensor, the conveying belt stops moving, the mud cutting cylinder acts to move the knife rack downwards till a mud cutting knife cuts off the mud column, at the moment, the stop block increases mud cutting force under the action of the force increasing spring, after the mud column is cut off, the knife rack retreats, and the force increasing spring stores energy and waits for the next time of work order. Through the side-entering type force increasing mud cutting mechanism, the problems that traditional mud cutting equipment is low in efficiency and low in automation degree, and cutting-off length cannot be adjusted are solved, meanwhile an automatic production line can be formed conveniently, andthe advantages of simple operation and good cut-off quality are achieved.

The invention belongs to the technical field of heat storage, and particularly relates to a method and device for inhibiting the supercooling degree of an erythritol phase change heat storage material. According to the invention, low-temperature nitrogen bubbles are used as a cold source and are pumped into the supercooled erythritol, and the erythritol on the surfaces of the bubbles is rapidly cooled to form a huge temperature difference locally, so the erythritol on the surfaces has enough potential energy to overcome intermolecular hydrogen bond acting force; and therefore, the supercooled erythritol in the heat storage device is induced to be solidified and to release heat by virtue of crystal nucleuses formed by mutual aggregation. The device comprises a nitrogen generating device, a nitrogen cooling device, a nitrogen atomizing device and the like. The nitrogen generating device is used for generating nitrogen needed in the method, the generated nitrogen firstly enters the nitrogen cooling device, and the nitrogen cooling device cools the nitrogen to 15 DEG C or below and is used for strengthening inhibition effect on supercooling behaviors. The nitrogen atomizing device is used for atomizing nitrogen in a pipeline into small bubbles, so a plurality of inducible freezing points exist in the erythritol, and a solidification rate and a heat release rate are accelerated.

The invention belongs to the field of two-dimensional material preparation, and in particular relates to a method for preparing large-size single-crystal two-dimensional materials based on chemical vapor deposition. The method is as follows: using a mixture of carrier gas A and carrier gas B as the carrier gas, first constructing a nearly flat and slightly convex temperature field by setting the ratio of carrier gas A and carrier gas B, and then adjusting the ratio of the two to construct a flat and flat temperature field. A large-size single-crystal two-dimensional material is obtained through chemical vapor deposition; the carrier gas A is an inert gas, and the carrier gas B is a gas with different thermal conductivity from the carrier gas A. By introducing into the reaction chamber gas that does not participate in the chemical reaction of two-dimensional materials and has different thermal conductivity, the invention can effectively regulate the temperature field in the reaction chamber while strengthening the interaction between substances, and design and realize the two-dimensional material in the reaction chamber. The transition from the convex temperature field to the flat temperature field in the material growth region fully provides the temperature driving force, which in turn promotes the lateral growth of the core of the two-dimensional material, and finally obtains a high-quality large-size single-crystal two-dimensional material.

The present invention relates to a kind of preparation technology of 3-peroxy-2-indolone compound, this method takes 2-indolinone derivative as raw material, water is reaction solvent, and peroxide tert-butanol at a certain temperature and Under air conditions, the 3-peroxy-2-indolinone compounds were prepared in high yield. The inventive method does not use any additive, realizes C (sp in green solvent) 3 The peroxidation reaction of )-H bond has the advantages of simple synthesis and post-treatment process, low cost and environmental friendliness.

The invention discloses a dendritic graphene and a preparation method thereof, and relates to the field of graphene material preparation. The present invention utilizes copper salt and reducing agent to react under alkaline conditions, and self-assembles to form a dendritic three-dimensional copper substrate; through chemical vapor deposition technology, graphene is deposited on the dendritic three-dimensional copper substrate; adding corrosion solution to remove the copper substrate, namely Dendritic three-dimensional graphene was obtained. The dendritic three-dimensional graphene of the present invention has a good dispersion type, and effectively prevents problems such as stacking, porosity, and unstable configuration. The preparation process of the invention is simple, the conditions are mild, and the source of raw materials is wide, which is suitable for mass production and has broad application prospects.