106results about How to "Avoid the risk of electric leakage" patented technology

The invention discloses an orbital type coal transporting trestle automatic polling robot and system. The polling robot comprises a machine cabin with a track walking mechanism and a polling image acquisition device, the machine cabin is of a closed structure and is provided with a wireless charging receiving module, and a power module, a control module and a wireless communication module are arranged in the machine cabin. The track walking mechanism comprises a walking drive device and a main frame, the main frame is provided with a guide load bearing wheel assembly and a pair of sliding slots, the two sides of the walking drive device are provided with connecting posts which transversely extend out, and the connecting posts are slidably arranged in the sliding slots; and a track mountingposition is formed between the guide load bearing wheel assembly and a track walking component of the walking drive device, one end of each sliding slot is provided with a pressure regulating deviceused for adjusting the frictional force of the track mounting position, and the connecting posts abut against or are supported to the pressure regulating devices. The orbital type coal transporting trestle automatic polling robot and system have the advantages of good protection performance, strong environmental adaptability, safe and reliable charging, strong driving capability, long service lifeand good walking stability.

The invention relates to a liquid metal insulation and heat-conduction material. The liquid metal insulation and heat-conduction material comprises a liquid metal and an insulation matrix material, the liquid metal is modified with a surface modification solution, and is uniformly dispersed in the insulation matrix material in a nano-level liquid droplet form, the liquid metal is metal or alloy having a melting point being 7-200 DEG C, and the surface modification solution is prepared through adding a surfactant into anhydrous ethanol. The liquid metal insulation and heat-conduction material prepared in the invention can guarantee a good insulation property, makes the volume resistivity equal to or more than 10<10> omega.m, has a high heat conduction property, allows the heat conductivityto reach 3.4 W / m.K or more, overcomes the defect of poor stability in the prior art, well meets the requirements of electronic devices for high performances and good heat dissipation property, has anexcellent application prospect, and promotes the further development and application of liquid metal thermal interface materials.

The embodiment of the application provides a traffic signal lamp control method and system; the traffic signal lamp control system can be applied to various of application scenes, and has the following features: 1, the traffic signal lamp can be connected to the network via Ethernet port, GPRS, and NB-IoT modes, and communicates with control equipment; 2, the control equipment gives a network order so as to control the signal lamp to be on / off; 3, the signal lamp can detect a lamp color output state in real time and sends the state to the control equipment via the network, and the control equipment determines whether a signal lamp set output state in a crossing has abnormity or not; when the control equipment does not response, the signal lamp set in the crossing can form a network via theinternet, and continuously outputs a pre-stored lamp color output scheme in synergy; 4, if certain signal lamp is cut off from the network or damaged, the signal lamps can all enter a yellow lamp scintillation state.

A clothes dryer (1) is provided with: a heat pump device (7) formed by connecting a compressor (2), a condenser (3), a throttle section (4), and an evaporator (5) by a pipe path (6) so that a refrigerant circulates therethrough; a drying chamber (9) for receiving an object to be dried; and an air flow path (10) for conducting drying air to the drying chamber (9). The clothes dryer (1) is also provided with: a blower (8) for delivering the drying air to the drying chamber (9); a discharge section (15) disposed upwind of the evaporator (5) and discharging cleaning water toward the evaporator (5); a water supply path (16) for supplying the cleaning water to the discharge section (15); and a ground section (13) for discharging electrical charges within the heat pump device (7) to the ground. The ground section (13) is provided so as to be in contact with at least a part of the cleaning water discharged from the discharge section (15).

The present invention discloses a solar cell and preparation method thereof, a battery piece based on a solar cell and a photovoltaic module. Transmitting electrodes on a silicon substrate of a solarcell are a plurality of independent transmitting electrodes, and preset distances are arranged between edges of the adjacent transmitting electrodes; the positive electrode patterns and the negative electrode patterns of a dye-sensitized solar cell are a plurality of independent electrode patterns, and each transmitting electrode corresponds to one independent positive electrode pattern and one independent negative electrode pattern up and down. When the solar cell is sliced, the portion between the edges of the adjacent transmitting electrodes perform cutting for the solar cell to prevent thesolar cell from damaging the pn junction in the slicing process to cause performance degradation of the solar cell and avoid edge leakage and short circuit because the electrode residual slurry afterslicing and the metal powder in the slicing process pollute a notch; and moreover, the notch stress is small to reduce the battery piece fragmenting or subfissure caused by stress releasing and improve the slicing yield and module reliability.

The invention discloses an instant-heating type water dispenser and a water vapor separating device thereof. The water vapor separating device comprises a housing, a hot water outlet nozzle, a hot water inlet nozzle, an upper gas exhaust nozzle, a first water vapor blocking rib, and a second water vapor blocking rib, wherein the housing is formed by connecting an upper cover and a lower cover in asealing node, and is provided with a separating cavity therein; the hot water outlet nozzle is arranged at the first tail end of the lower cover; the hot water inlet nozzle and the upper gas exhaustnozzle are arranged on the upper cover; the first water vapor blocking rib upwards extends from the inner side surface of the lower cover; a hot water circulating hole of a hot water flowing path is formed between the first water vapor blocking rib and the hot water outlet nozzle; the second water vapor blocking rib extends downwards from the inner side surface of the upper cover; the second watersteam blocking rib is positioned between the hot water inlet nozzle and the first water vapor blocking rib; and the lower tail end position of the second water vapor blocking rib is lower than the upper tail end position of the first water vapor blocking rib. The instant-heating type water dispenser is simple in structure, discharges hot water stably, and can prevent splashing while hot water isdischarged to improve use safety.

The invention provides a flip-chip light emitting diode chip and a method of manufacturing the flip-chip light emitting diode chip. An N-type metal electrode layer extends to the edge of an N-type semiconductor step. A light emitting layer, a P-type semiconductor layer and a transparent conductive layer are disposed in a middle portion of the flip-chip light emitting diode chip, and thus, a Mesa step (a quantum well) is away from the edge of the chip. When crack breakage happens to the edge of the flip-chip light emitting diode chip and solder paste is connected with a P or N pole, short circuit of a P-type metal electrode layer and an N-type metal electrode layer is not caused, and leakage failure does not occur. Through three times of photoetching of the flip-chip light emitting diode chip manufacturing method, the number of photoetching processes is reduced, the use cost of raw materials such as a photoresist and a developer involved in the photoetching process can be saved, and theyield loss brought by photoresist residue can be effectively improved.

The invention provides an upside-down mounted LED chip and a manufacturing method thereof. N type metal electrode layers are arranged in the peripheral edges of the upside-down mounted LED chip, and aP type metal electrode layer is arranged in the middle part of the upside-down mounted LED chip. Even if solder paste is connected with P or N poles due to damage of an insulating layer in the edge of the upside-down mounted LED chip, the P type and N type metal electrode layers are avoided from short circuit and electric leakage failure. A light emitting layer, a P type semiconductor layer and the P type metal layer are arranged in the middle part of the upside-down mounted LED chip, so that a mesa step (quantum well) is far from the edge of the chip, and the problem that a traditional upside-down mounted LED chip has the risk of electric leakage due to tendency to short circuit of the P and N electrodes and lack of an isolated slot is solved. The leakage risk can be reduced effectively,the working reliability of products is improved, and the yield rate of the products is improved.

The invention discloses a vehicle engine cabin lighting control device, a vehicle engine cabin lighting system, a vehicle engine cabin lighting control method and a vehicle. The control device includes a receiving unit used for receiving opening signals indicating the opening of a hood of an engine cabin and receiving light intensity, and a control unit which is connected with the receiving unit and is used for starting up a photosensitive sensor installed in the engine cabin when receiving the opening signals so as to enable the photosensitive sensor to detect light intensity in the engine cabin, and is used for determining light emitting strategies of a light-emitting device which irradiates the interior of the engine cabin according to the received light intensity, and controlling the light-emitting device to emit light according to the determined light emitting strategies. With the vehicle engine cabin lighting control device, the vehicle engine cabin lighting system and the vehicle engine cabin lighting control method of the invention adopted, automatic control on the lighting of the engine cabin can be realized, and abundant light can be provided when the engine cabin is opened to repair equipment at night or under dark environment, and therefore, the state of the equipment can be seen clearly, and repair can be facilitated.

The invention discloses cake desserts. The cake desserts are prepared by stirring microwave cake powder with eggs. The microwave cake powder comprises the following raw materials: white granulated sugar, wheat starch, corn starch, non-dairy cream, glucose, modified starch, baking powder, a compound emulsifier, and xanthan gum; the raw materials are mixed and stirred, and then, sieved so as to prepare the microwave cake powder; and the prepared microwave cake powder is stirred together with the eggs. Moreover, the wheat starch and the corn starch are utilized instead of low-gluten flour, so that the prepared cakes are softer, finer and smoother. When the desserts are being prepared, the raw materials are carefully selected, mixed and stirred, and exhausting and packaging are carried out. By utilizing a powder-packing on-line automatic exhaust device, air in plastic packages is exhausted, so that the breakage rate caused by extrusion during the transportation process of the cake desserts is reduced from 30% to 1%; and a large amount of production time and manpower costs are effectively saved.

The invention discloses a system used for heating through solar and electromagnetic heating and having a heat storage function. The system comprises a solar heat collector, an electromagnetic heater, a heat storage body and a heat dissipation unit. With the system, heating is performed through electromagnetic induction in the valley period by the aid of the difference between peak and valley electricity prices, heat is stored in a heat storage unit, the stored heat is used in the peak period, the electromagnetic heater is used for auxiliary heating in the flat period, economical and saving effects are realized, and meanwhile, a grid can be optimized through peak reducing and valley filling.

A piezoresistive pressure sensor includes a substrate and a silicon device layer. The substrate has a cavity. The silicon device layer includes a diaphragm and a support element. A top surface of the diaphragm is connected to a top surface of the support element by one or more side surfaces. A recess of the silicon device layer is defined by the top surface of the diaphragm and the one or more side surfaces. A plurality of piezoresistive regions are on the top surface of the diaphragm, on the one or more side surfaces and on the top surface of the support element. A plurality of conductive regions are on the top surface of the support element. The plurality of conductive regions do not extend to the top surface of the diaphragm. The plurality of piezoresistive regions have a first ion dosage concentration. The plurality of conductive regions have a second ion dosage concentration. The second ion dosage concentration is greater than the first ion dosage concentration.

The invention relates to a chiffon cake. The chiffon cake is formed by stirring chiffon cake premixed flour, eggs and water, wherein the chiffon cake premixed flour contains the following raw materials: white granulated sugar, wheat flour, wheat starch, an emulsifying agent, baking powder and table salt. A preparation method of the chiffon cake comprises the following steps: adding eggs and water into the chiffon cake premixed flour, uniformly mixing, rapidly mixing for about 5 minutes by adopting a stirring device, then adding edible oil, uniformly stirring, putting into an oven at the temperature of 180 DEG C, and baking for about 45 minutes, so that the chiffon cake with mellow taste can be obtained. Besides, the chiffon cake premixed flour is blended in advance when the chiffon cake is prepared, a powder instant drying technology is adopted after mixing and stirring, moisture of starch can be reduced by 2-4% within 5 seconds, the problems that the baking powder loses efficacy and a product cakes are effectively solved, a whole egg beating method is adopted, the complexity of a chiffon cake separate egg beating method is simplified, the chiffon cake preparation time is shortened, the working efficiency is improved, and the effect of a cake prepared by adopting the separate egg beating method is also realized.

The invention discloses a building big data management and control platform, which comprises a control cabinet, an environment monitoring module, a building equipment module and a remote monitoring module, and is characterized in that one side of the control cabinet is fixedly connected with a touch display, the control cabinet comprises a touch display, a management and control unit, an information receiving unit and a communication module, and a storage function is built in the management and control unit; and the environment monitoring module comprises an information transmission unit, a temperature monitoring unit, a humidity monitoring unit, an air quality monitoring unit, an illumination monitoring unit and an entrance guard monitoring unit. According to the invention, the indoor temperature, humidity, air quality, illumination and entrance guard of the building are monitored through the environment monitoring module; the control unit performs logic judgment on the environment monitoring information and generates a control instruction, and the control instruction is transmitted to each piece of equipment in the building equipment module through a wire, so that each piece of equipment in the building equipment module is regulated and controlled, and an environment capable of enabling a human body to feel comfortable is kept indoors.

The invention belongs to the field of refrigerators, and discloses a pipeline system for a refrigerator. The pipeline system comprises a compressor, a condenser, a capillary tube, an evaporator, and aheat-conducting pipeline, wherein the compressor is used for working and pressuring a hot refrigerant of the refrigerator and outputting a gaseous hot refrigerant; the condenser is used for condensing and dissipating the gaseous hot refrigerant; the capillary tube is used for receiving the hot refrigerant from the condenser and reducing the temperature and pressure of the hot refrigerant to forma fluent hot refrigerant; the evaporator is used for receiving the fluent hot refrigerant and enabling the hot refrigerant to exchange heat with the space within the refrigerator; and the heat-conducting pipeline is located near the evaporator and is used for performing one or more in following operation: receiving and transmitting the hot refrigerant from the capillary tube to assist the evaporator in heat exchanging, and receiving and transmitting the hot refrigerant from the condenser to melt frost on the surface of the evaporator. The pipeline system can realize auxiliary refrigeration anddefrosting of the refrigerator, improve the heat exchanging efficiency, eliminate the risk of electric leakage, and reduce the refrigerator cost.

The invention relates to a stereo garage and a charging connection device. The charging connection device comprises a first contact component and a second contact component which are detachably arranged; the first contact component includes a first electrode sliding laterally, and the second contact component includes a second electrode; one of the first contact component and the second contact component is mounted on a vehicle carrier used for bearing the vehicle and driving the same to move; a position adjusting mechanism is arranged between the first contact component and the second touch component so as to drive the first contact component and / or the second contact component to align in position adjustment when the first contact component and the second contact component approach and drive the first electrode to slide lateral to be abutted with the second electrode to be connected when the first contact component and the second contact component continuously approach, and the vehicle on the vehicle carrier is charged. By the arrangement, wiring and charging of a garage are made simpler, impact on parking position precision is reduced, and parking and charging efficiency is improved.

The invention discloses a water pump powered through wireless induction. A motor is assembled inside a pump body of the water pump, and a wireless current receiving component enabling the motor to obtain a power source is integrated inside the pump body. Wireless power supply of the water pump is achieved in the modes of electromagnetic induction, magnetic field resonance, radio waves and the like, and water and electricity separation is achieved in the running environment of the water pump, so that the electric leakage risk caused by damage and aging of electric lead is eradicated; and the use of power lines is also reduced, so that the cost is saved; and the water pump can conveniently select a proper working position in a water body, so that the flexible configuration effect is achieved.

The invention discloses mechanical equipment for making chiffon cake. The mechanical equipment comprises a three-dimensional mixer, a stirring device, a hot air drying system, a flour drying online cooling system, a die and an oven, wherein a discharge port of the three-dimensional mixer conveys the premixed flour of chiffon cake to a feed port of the hot air drying system through a first conveying belt; the hot air drying system conveys the dried premixed flour of chiffon cake to a feed port of the flour drying online cooling system through a second conveying belt; a discharge port of the flour drying online cooling system conveys the cooled premixed flour of chiffon cake to a cup body of the stirring device through a third conveying belt. According to the mechanical equipment, the drying system reduces the moisture of starch to 2-4%, and the problems of baking flour failure and product caking are effectively solved; through the flour drying online cooling system, the flour temperature is reduced to about 20 DEG C through twice cooling by a big cold air blower and a small cold air blower, thus the flour is looser and does not cake easily and has better mouthfeel; and moreover, the mechanical equipment is simple and practical, shortens the cooling time and improves the efficiency.

The invention provides a combined tea set. The combined tea set comprises a base, a water storage cup, a kettle, a base water inlet pipe and a water pumping device. The base is provided with a controlcircuit and a first coupler, a water outlet of the base water inlet pipe is formed in the first coupler, and the water storage cup is provided with a second coupler, a water storage cup communicatingpiece electrically connected with the second coupler and a bottom water inlet which is formed in the second coupler and can be communicated with the base water inlet pipe. The water pumping device issuitable for being connected to an external water storage container through a water guiding pipe, is connected with the water inlet pipe of the base and is electrically connected with the control circuit, and the water pumping device is set to be started to add water into the water storage cup when the control circuit identifies the water storage cup conduction piece. Therefore, water inlet, water storage and water boiling are integrated on one set of device, and water can be automatically fed into the water storage cup, so that a user can manually pour water into the water boiling kettle, the conventional water boiling and tea making requirements with better appearance are met, and the use experience of the user is improved.

The invention discloses a technical preparation method of an IBC battery, which comprises the steps of A, performing front texturing and back polishing on an n-type original silicon wafer, the front textured surface ranges between 1 micron and 10 microns in size, the reflectivity of the textured surface is 9%-13%, and the back polishing reflectivity is 30%-45%; B, forming a first doped region at the back, and then performing back selective partition to remove an oxide layer; C, performing partition texturing and etching by using KOH with the mass ratio being 1%-3%, an additive with the mass ratio being 3%-5% and an etching solution with the temperature ranging between 75 DEG C and 85 DEG C, wherein the reflectivity of an etched area is 20%-28%; and then D, forming a second doped region at the back, forming FSF at the front, depositing a passivation layer at the front and the back, and finally selectively forming metal electrodes of a p-region and an n-region at the back. After adopting the method, in the back metal printing process, the p-region and the n-region are distinguished by using the textured surface / polished surface to form surface state contrast, a CCD camera has different spectral responses at different surface states in metal printing, and thus quick and accurate alignment of metal printing is achieved.

The invention relates to the technical field of LEDs, in particular to a mini LED chip and a manufacturing method thereof.The chip comprises a sapphire substrate, a bonding layer, a P-type semiconductor layer, a light-emitting layer, an N-type semiconductor layer, a P contact electrode, an N contact electrode, a graphite heat conduction layer, a passivation layer, a P electrode and an N electrode; the graphite heat conduction layer is composed of titanium oxide and graphite. Heat dissipation holes penetrating through the passivation layer are designed in the surface, corresponding to the graphite heat conduction layer, of the passivation layer, and the heat dissipation holes are backfilled with graphite and make contact with the graphite heat conduction layer. The graphite heat conduction layer is added in the mini LED chip, the heat dissipation holes are designed in the surface of the passivation layer, the heat dissipation holes are backfilled with the graphite, heat generated when the mini LED chip works can be effectively conducted out by means of the ultra-strong heat conduction capacity of the graphite, the temperature of the chip is reduced, the stability of the photoelectric property of the chip is improved, and the service life of the chip is effectively prolonged.

The invention discloses a copper bar protection structure which comprises an upper shell and a lower shell which are in butt joint with each other, the butt joint faces of the upper shell and the lower shell are each provided with a containing groove, the two containing grooves form a copper bar containing space, phase-change material layers are laid on the inner walls of the containing grooves, and when the copper bar accommodating space accommodates a copper bar, the copper bar is wrapped by the phase-change material layers. According to the copper bar protection structure, the copper bar containing space is designed between the upper shell and the lower shell which are in butt joint, the phase-change material layers are laid on the inner walls, then the copper bar is wrapped, and the copper bar protection structure achieves the effect of cooling the copper bar while achieving installation protection of the copper bar. The invention further provides a battery pack and an electric vehicle.

The invention discloses a door lock device provided with an electric-control permanent magnetic chuck and a using method of the door lock device. The door lock device comprises a door frame and a doorleaf, wherein the door frame and the door leaf are connected through spring hinges. The electric-control permanent magnetic chuck is mounted on one side of the door frame and is connected with a controller through a cable, and the other end of the controller is connected with a power socket. An attracted plate is inlaid in the position, corresponding to the electric-control permanent magnetic chuck, of the door leaf and is used for being attracted by the electric-control permanent magnetic chuck. The controller is used for controlling magnetization and demagnetization of the electric-controlpermanent magnetic chuck. According to the door lock device provided with the electric-control permanent magnetic chuck and the using method of the door lock device, the door lock device does not needto be maintained in the power-on state all the time, and strong magnetic attraction force can still be kept all the time after the door lock device is powered off so that the door lock device can belocked on the whole and can also be powered off after being magnetized or demagnetized once, and the influence of accidental power-off on the working state of a magnetic lock is avoided. The door lockdevice can be remotely controlled and be manually controlled through a button and has the advantages of being easy to operate, long in service life, not prone to being affected by the environment andthe like.

The invention discloses a vacuum drainage system capable with quick-opening passive vacuum sewage discharge valves and a drainage method. The vacuum drainage system comprises a plurality of sewage collection tanks, a vacuum smashing tank and a vacuum pump; the sewage collection tanks are parallelly connected to one end of a first vacuum pipe through connection pipes, the vacuum smashing tank is connected to the other end of the first vacuum pipe, and the vacuum smashing tank is connected with the vacuum pump through a second vacuum pipe; the vacuum pump is connected with a sewage discharge pipe, the quick-opening passive vacuum sewage discharge valves are arranged in all the sewage collection tanks, and the vacuum sewage discharge valves comprise control tanks, floating tanks and ball conveying tanks which are arranged in the sewage collection tanks; balls are arranged in the ball conveying tanks, the ball conveying tanks can move up and down with the floating tanks along the control tanks, and ball inlets and ball outlets are formed in the control tanks respectively; open-close reset mechanisms with pull rods and driving rods are further arranged in the sewage collection tanks, the pull rods are connected with the constant-closed vacuum sewage discharge valves, and one end of each driving rod extends into the corresponding control tank and is located between the corresponding ball inlet and the corresponding ball outlet.

The invention discloses a preparation method for forming a Split Gate MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) in one step, and relates to the technical field of semiconductor power devices. The method and the device are used for solving the problem that the preparation cost is increased due to the fact that preparation steps are increased in order to avoid gate poly residues on a linker oxide of a peripheral terminal trench in the preparation of an existing MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) device. Comprising the following steps: sequentially forming a liner Oxide layer and a source poly layer in a first groove and a second groove; second photoresist layers are formed on the two sides of the top of the second groove, the top of the first groove and the two sides of the top of the first groove, and the source poly layer and the liner oxide layer in the second groove are etched through an etching method; the second photoresist layer is removed, and the liner oxide layer is etched through an etching method; and forming a gate oxide layer and a gate poly layer in the second groove, on the two sides of the top of the second groove, on the top of the first groove and on the two sides of the top of the first groove.

The invention provides a public electric bicycle which comprises a lock cylinder and an electric bicycle, wherein a storage battery is mounted on the electric bicycle. The public electric bicycle is characterized in that a lock member is fixed at the front end of an electric bicycle head; a penetration lock hole is formed in the side surface of the lock member; two copper rods are arranged inside the lock member; the two copper rods are close to the upper and lower sides of the lock member respectively; the two copper rods are positioned on the two sides of the lock hole respectively and electrically connected with the anode and cathode of the storage battery respectively; the side surfaces of the two copper rods are coated with an insulating rubber body; and the tail end of the lock member is opened for externally connecting the copper rods with a power supply. In the invention, since a charging dock is arranged in the lock cylinder, the public electric bicycle can be charged while being locked, and existing public bicycles can be replaced; and meanwhile, the risk of electric leakage can be avoided, and charging connection can be realized more conveniently, thereby being safe and reliable.

The invention provides a method for preparing a GaN-based inversely-installed thin film structure near-ultraviolet LED. The method comprises the steps of: growing a u-GaN layer, an n-GaN layer, a multi-quantum well layer and a p-GaN layer; forming grooves in the p-GaN layer by means of photolithography and dry etching to expose n-GaN; preparing a p-type ohmic contact layer on the p-GaN layer; preparing a metal barrier layer on the p-type ohmic contact layer; growing an insulating layer on the metal barrier layer and in the grooves, and growing n-GaN ohmic contact electrodes; growing a metal material layer on the insulating layer, and adhering a secondary substrate onto the metal material layer; removing the grown substrate; forming a scribing groove and preparing p welding pads; coarseningu-GaN; and segmenting a chip structure, and completing the preparation of the GaN-based inversely-installed thin film structure near-ultraviolet LED. The method successfully overcomes the technical difficulties of etching process of the u-GaN and N-surface n-GaN ohmic contact, overcomes the electric leakage risk caused by dry grooving and acid grooving, thereby improving the yield and stability of the GaN-based inversely-installed thin film structure near-ultraviolet LED, and is conductive to mass production of chips.

The invention discloses a silicon dioxide SAB removing method which comprises the following steps: providing a flash memory wafer, wherein a device on the flash chip is covered by silicon dioxide SAB; reacting NH3 and HF steam with silicon dioxide SAB on the flash memory wafer to generate (NH4)2SiF6; and heating the reacted flash memory wafer to volatilize (NH4)2SiF6 to obtain a flash memory wafer of which silicon dioxide SAB is removed. According to the method, first, NH3 and HF steam are reacted with a silicon dioxide SAB film on the flash memory wafer to generate (NH4)2SiF6, and then, the flash memory wafer is heated to remove the silicon dioxide SAB film, thereby reducing undercut and avoiding leakage risks.

The invention relates to an invisible intelligent mechanical toilet bowl. The toilet bowl comprises a foldable conical urinal, a cover plate with a protrusion, a cleaning system, a draining device andan invisible door; switching between a folding state of being attached to the wall surface and a stretching state for a person going to a toilet is achieved through rotation; the cover plate is inserted downwards through the protrusion and gradually supported to form a cone shape in a stretching state; the cleaning system comprises a flush atomizing tube arranged on the cover plate and a negativeion supercharging shower gun flush pipe arranged in a protrusion interlayer; the draining device comprises a soft rubber twisted closed valve on a urinal drain pipe. Accordingly, by arranging the foldable conical urinal, the cover plate and a corresponding auxiliary device, after the toilet bowl is used, the invisible door is folded and closed to be hidden on the wall surface, a rest room becomesa bathroom or a laundry room or a dressing room without taking the space of the rest room, cleaning is facilitated, and the phenomenon that a traditional toilet bowl causes long-term odor is completely avoided; the function that one object has multiple functions can be achieved, and a male urinal of the toilet can be replaced.