237results about How to "Not easy to peel off" patented technology

A plurality of thin-wall parts (9a) of a sealant layer (7) are formed in a portion continuously changed in the interval of one sealing part (8) and a gas barrier layer (6) of other laminate film (4). At the inner circumferential side between the adjacent thin-wall parts (9a) and the thin-wall part (9a) at the innermost circumferential side and at the outer circumferential side of the thin-wall part (9a) of the outermost circumferential side, a thick-wall part (9b) of the sealant layer (7) is formed. All of the opposing sealant layers (7) between the two adjacent thin-wall parts (9a) are mutually heated and fused, so that an excellent adiabatic performance is maintained for a long period.

A water nan-composite thermal-insulating coating for external wall and its production are disclosed. The coating consists of water, polymer emulsion, high-refractive index pigment, filler, nano-tin-antimony oxide slurry, nano-SiO2, wet dispersant, filming accessory, pH adjuster, thickener, de-foaming agent, anti-freezing agent and mildew-proof bactericide. It's cheap and simple, has excellent wash and weather resistances, better thermal-insulating performance, safe storage and no environmental pollution. It can be used for apparatus surface and architecture external wall.

The invention relates to an ultraviolet curing coating which is characterized in that the ultraviolet curing coating comprises 1-35 wt% of epoxy acrylate, 1-35wt% of urethane acrylate, 20-50wt% of polyfunctional acrylate monomer, 1-15wt% of additive and 1-10wt% of photoinitiator. The coating formed by ultraviolet curing coating obtained by adopting the technical scheme has the advantages of good pollution resistibility, easy cleaning, high strength, strong adherence, high toughness and difficult stripping.

The invention discloses and provides a roasting sagger for a circulating type lithium battery anode material, which is simple in manufacturing process and structure, does not easily react with a lithium battery material, can avoid polluting the lithium battery material, does not pollute the environment and can be recycled, and a preparation method thereof. The preparation method of the roasting sagger for the circulating type lithium battery anode material comprises the following steps of: (1) uniformly mixing mullite, cordierite, aluminum oxide, corundum, kaolin, active magnesium oxide, spodumene and a bonding agent; adding the materials into a metal mould according to the weight; and pressing and molding a blank by pressing and molding equipment; (2) uniformly mixing zirconium oxide, the spodumene, cerium oxide, the corundum and the bonding agent; uniformly distributing the materials on the surface of the blank by a material distribution machine or manpower and pressing again by the pressing and molding equipment to obtain a semi-finished sagger product; and (3) drying the sagger semi-finished product and sintering. The roasting sagger disclosed by the invention can be widely applied to the field of the sagger for the lithium battery anode material.

The invention provides a conductive fabric and a preparation method thereof. The conductive fabric comprises, from inside to outside, an adhesive force improving layer attached to the surface layer ofa fabric substrate, a liquid metal layer, an oxygen isolation protective layer and a packaging protective layer. The preparation method comprises: applying the adhesive force improving layer to the surface layer of a fabric substrate, coating the adhesive force improving layer with the liquid metal layer, coating the liquid metal layer with the oxygen isolation protective layer, and coating the oxygen isolation protective layer with the packaging protective layer. The coating manner includes spraying, brush coating, flow coating or printing. Compared with a conductive fabric in the prior art,the conductive fabric is excellent in conductivity, fold resistance, laundering durability and tensile property. The preparation method is simple and reliable.

The invention discloses conductive graphite cream and a preparation method thereof, which solve the technical problem of improving dispersibility of graphite cream. The conductive graphite cream comprises materials including, in weight percent, 10-30% of conductive graphite, 1-30% of matrix resin, 0.1-5% of conductive polymer auxiliaries, 0.1-5% of dispersing auxiliaries and the balance solvents. The preparation method includes the steps: adding the conductive polymer auxiliaries into the solvents to obtain solution 1; adding the matrix resin into the solvents to obtain solution 2; adding the conductive graphite into the solution 2; adding the dispersing auxiliaries into the solution 2 for ball-milling; adding the solution 1 into solution 3; and performing ultrasonic oscillation, high-pressure dispersion and stirring to obtain the conductive graphite cream. Compared with the prior art, the conductive graphite cream and the preparation method have the advantages that nano carbon materials are added, ball-milling, ultrasonic oscillation and high-pressure dispersion are performed for assisting so that the conductive graphite cream is uniformly dispersed, and the preparation method is simple and low-cost.

A copper-clad board suitable for making a hole with a carbon dioxide gas laser, which copper-clad board is obtained by disposing a double-side-treated copper foil provided with a metallic-treatment layer having a high absorption rate of a carbon dioxide gas laser energy on at least one surface, at least on an outer layer of a thermosetting resin composition layer such that the metallic-treatment layer is formed on a shiny surface of the copper foil which shiny surface is to be a surface layer, and laminate-forming the double-side-treated copper foil and the thermosetting resin composition layer under heat and pressure, to make an alloy of the metallic-treatment layer and the copper by the above heating, a method of making hole in the above copper-clad board and a printed wiring board comprising the above copper-clad board.

The present invention provides a hot press formed product being improved in corrosion resistance and in the adhesion of a coating film, which is produced by subjecting a zinc-based metal plated steel product to a hot press forming, and has a zinc-based metal plating layer containing and, formed thereon, a zinc oxide layer, wherein the uppermost zinc oxide layer has an average thickness of 2 mum or less; and a hot press formed product being excellent in corrosion resistance, the adhesion of a coating film, the resistance to corrosion after coating, and weldability, which has a basis steel plate (1) and, formed thereon, a layer (2) consisting essentially of an iron-zinc solid solution phase and, as the uppermost layer, a zinc oxide layer (3) having an average thickness of 5 mum or less, and has substantially no iron-zinc intermetallic compound phase, wherein the iron-zinc solid solution layer (2) and the zinc oxide layer (3) contain Al in a total amount of 0.5 g/m<2> or less and/or contain Al oxides in a total amount of 5 mg/m<2> or less in terms of Al.

The invention discloses a low-pressure high-flux chlorine-containing polymer nanofiltration membrane with a stable separation layer and a preparation method thereof. The nanofiltration membrane comprises a macroporous support layer and a dense function layer, wherein the macroporous support layer and the dense function layer are connected with each other by virtue of a C-N bond; the dense function layer is made of a positive, charged or amphoteric ionic cross-linking polyamine compound; the macroporous support layer is made of a chlorine-containing polymer. The preparation method of the filtration membrane comprises the following steps: firstly coating the surface of a chlorine-containing polymer ultrafiltration membrane with the polyamine compound, carrying out heat treatment, washing the ultrafiltration membrane, then dipping the ultrafiltration membrane in a mixed solution of a cross-linking agent and a charge reagent and carrying out heat treatment again. The membrane flux of the prepared polymer nanofiltration membrane can reach 60L/m<2>.h under the pressure of 0.3MPa; the retention rate on micromolecule dye and high-valence inorganic salt can reach 90%; the chlorine-containing polymer nanofiltration membrane can be in a flat fiber ultrafiltration membrane form or a hollow fiber ultrafiltration membrane form, and has good practical prospect.

The invention belongs to the field of laser processing, and specifically provides an ultrahigh-speed laser cladding system. The system is characterized in that ultrahigh-speed laser cladding linearityspeed can be realized when a workpiece rotates at a high speed; laser and powder mutually act, and the system parameters are adjusted and matched, thus a dense cladding layer can be formed on the surface of the workpiece. Compared with a traditional laser cladding system, the ultrahigh-speed laser cladding system has the advantages that the laser cladding efficiency is improved dozens of times, and moreover, the obtained cladding layer is of a completely metallurgical combination form; the surface smoothness is high; the material utilization rate is high; the energy consumption is low; the production cost can be extremely saved; and the production efficiency is improved.

The invention discloses a corundum breathable seat brick with high thermal shock resistance. The brick consists of mixed corundum, a magnesium-containing material, a binding agent, chromium oxide, a water reducing agent and an explosion-proof agent. The production method of the corundum breathable seat brick comprises the following steps: dosing, and mixing to prepare mud; placing the mud in a mould, performing shake densification, demoulding, and drying to obtain a breathable seat green brick; and heating the breathable seat green brick, and roasting to obtain the corundum breathable seat brick with thermal shock resistance. The component ratio is reasonable, the production and preparation method is simple, the prepared breathable seat brick has good high-temperature strength and thermal shock resistance; and the service life of the breathable seat brick can be effectively prolonged, the use security of the breathable brick can be increased, the replacement times of the breathable brick can be reduced, the production cost of enterprises can be reduced and the production efficiency of ferrous metallurgy can be increased. The corundum breathable seat brick can replace the existing breathable seat brick and be suitable for industrial production.

The invention provides a preparation method of a micro drill provided with a transition metal boride coating and used for a PCB. The preparation method includes the steps that a micro drill base body is subjected to cleaning treatment, the cleaned micro drill is installed in a sputtering coating device, vacuumizing is performed, a heating device is started to heat the micro drill base body, and then ion bombardment cleaning is performed on the surface of the micro drill base body; and under the situation that it is kept that an ion source still works, the transition metal boride coating is deposited in a sputtering manner, in the deposition process, the heat stress and the growing stress are regulated by adjusting and controlling the deposition temperature and the negative bias pressure set on the base body, and therefore the transition metal boride coating with the stress being low and even being zero is obtained. The coating is smooth and compact, low in friction coefficient, high in binding force with the base body, not prone to stripping and suitable for preparation of a hard abrasion-resistant coating on the micro drill used for the PCB. The invention further provides the micro drill provided with the transition metal boride coating and used for the PCB.

The invention relates to a metal surface treatment agent used for forming a surface treatment coating. Even if a resin film is laminated onto a substrate surface made from stainless steel, and molding is subsequently carried out, the metal surface treatment agent imparts a high adhesion to the laminate film, so that the laminated film is prevented from peeling and can maintain a stable adhesion over the long term, regardless of exposure to high-boiling gas atmosphere, solvent and acid. The metal surface treatment agent contains a Cr(III) compound (A), and at least one type of compound (B) selected from an inorganic compound (b1), a film-forming inorganic compound (b2) and an organic chelate compound (b3) which can bond to Cr (III) compound (A) to form a film. The organic compound (b1) has film-forming properties and is at least one from an anion compound and a nonionic compound. If the metal Cr equivalent mass of compound Cr (III) compound (A) is set to M, and the mass of compound (B) is set to N, the ratio N/M is set to fall within the range of 0.005 to 1.

The invention discloses a liquid crystal display and a manufacturing method thereof, which belongs to the technical field of the liquid crystal display. The invention solves the technical problem that the frame sealing adhesive in the prior liquid crystal display is easily stripped off and broken after being solidified. The invention provides a liquid crystal display which comprises an array substrate and a color film substrate oppositely arranged with the array substrate, wherein liquid crystals are filled between the display areas of the array substrate and the color film substrate, the peripheries of the display areas are sealed with the frame sealing adhesive, and protective layers are arranged at the periphery of the frame sealing adhesive. The invention also provides a manufacturing method of the liquid crystal display, which comprises the following steps: a protective layer is formed at the periphery of the predetermined position of the frame sealing adhesive coated on the array substrate; the frame sealing adhesive is coated at the predetermined position where the frame sealing adhesive is coated, and liquid crystal is dropped on the display area on the color film substrate; and the color film substrate and the array substrate are oppositely assembled. The invention is mainly applied to the liquid crystal display device.

The invention discloses a protein antimicrobial catheter. A non-diffusivity nanoscale smooth coating is arranged on the surface of the material of the catheter body, the main ingredient of the coating is natural protein harmless to the human body, the thickness of the coating is 10 nm to 500 nm, and the RMS roughness of the coating is not larger than 100 nm. The invention further discloses a manufacturing method of the protein antimicrobial catheter. The method includes the main steps that the material of the catheter body is pre-processed, protein glue solution is prepared, the surface of the material of the catheter body is coated with the protein glue solution one time or multiple times, and finally the protein glue solution adhering to the surface of the material of the catheter body is cured with the method of natural curing or microwave curing or hot curing or ultraviolet curing or cross-linking curing or the like. The catheter manufactured with the method is excellent in bacteria resistance and antibacterial effects, economical burdens and body pains caused when a catheter is frequently replaced for a patient can be reduced, the catheter is good in stability and low in virulence in body, some discomfort symptoms will not be caused to the patient, and the catheter is safe in clinical use.

The invention relates to a paraffin sectioning method for an ocean shellfish D-shaped larva, which comprises the following steps: (1) Boulin solution is added to a container having an ocean shellfish D-shaped larva sample, and then alcohol with mass percentage concentration of 70% is added so as to obtain a fixed ocean shellfish D-shaped larva; (2) the fixed ocean shellfish D-shaped larva is wrapped up and is placed in a sample embedding box, and the sample embedding box is placed in a dehydrator or a staining jar; and then the steps of dehydration, transparency and wax impregnation are carried out; (3) embedding and sample location are carried out; (4) slicing and drying are carried out; and (5) a hematoxylin-eosin counterstaining method is adopted for dying. The paraffin sectioning method is simple and practical, has short processing time and transitional steps, leads all tissues of the larva to be gradually and completely immersed by reagent, well keeps the original state and structure of the tissues of the larva and provides a practical and effective technical means for research on early stage embryos and larva development of shellfishes.

The invention provides a solar cell rear panel, a preparation method thereof and a solar cell module using the rear panel, wherein the solar cell rear panel comprises base material and a weatherproof layer and is characterized in that at least one side of the base material is covered with the weatherproof layer, and the weatherproof layer comprises the following components based on the total weight of the weatherproof layer: 10-20wt% of Fluoride organopolysiloxane, 20-30wt% of fluorocarbon resin, 2-6% of cross-linking agent and 15-40wt% of inorganic filler. The solar cell rear panel provided by the invention has the characteristics of good bonding force between the base materials and the weatherproof layer, and high size stability.

The invention provides an electromagnetic wave protection film capable of being repeatedly pasted and used. In the electromagnetic wave protection film, a surface of a base material is provided with one insulated flexible bonding layer. A surface of the insulated flexible bonding layer is provided with at least one metal layer. A metal layer surface is provided with one pressure-sensitive-type conducting resin layer. A surface of the pressure-sensitive-type conducting resin layer is provided with a protection film. Compared to a tedious heating lamination post curing technology, by using the film of the invention, only a portion which needs the electromagnetic wave protection film is pressed, a processing application technology is simple, and more laminated machines, baking ovens and other equipment are not needed; redundant personnel setting and complicated operation steps are not needed, a tolerable error rate is high, and energy losses and a possibility of generating danger in a subsequent operation can be effectively reduced; and more importantly, after actual positioning and pasting are wrong, repeated positioning usage can be stripped so that a waste edition which is generated because pasting is wrong is not generated. The protection film can be widely applied to portions of a mobile phone, a camera, a medical apparatus, a laptop and the like, such as a FPC soft board, PCB hard board and the like, wherein the portions needs electromagnetic protection.

The invention discloses a road marking machine with energy-saving function, which comprises a car body, wheels and a solar power supply device; a thread cleaning roller is installed in front of the car body, and the threads on the thread cleaning roller are left and right symmetrical; the car body There is a paint box in the body; the car body is provided with a feeding roller above the paint box, and the lower end of the feeding roller extends into the paint box; the feeding roller is equipped with a motor to drive its rotation; the car body There is a cylinder inside, and a brush is connected to the lower end of the cylinder, and the bottom end of the brush extends to the ground; an equalizing roller group is arranged between the feeding roller and the brush, and the feeding roller conveys the paint through the equalizing roller group Give the brush; the car body is provided with a dust suction device between the threaded cleaning roller and the hair brush, the dust suction device includes a dust suction cover positioned at the lower end of the car body, and a fan located in the dust suction cover; the dust suction cover Connected with pipes. The invention has simple structure, reasonable design, can save a lot of labor force, and has broad market prospect.

The invention discloses a preparing method of a glass antifogging coating, and belongs to the technical field of coating material preparations. The preparing method comprises the steps of firstly preparing an ethanol solution and methyltrimethoxysilane to a silane coupling agent solution, then preparing nanosilicon dioxide to nanosilicon dioxide sol, conducting a reaction between the nanosilicon dioxide sol and the silane coupling agent solution to prepare reaction liquid, using acetone to scrub a glass base material, afterwards, conducting ultrasonic cleaning and etching processing on the glass base material, conducting soaking and curing processing on the glass base material by using the reaction liquid to obtain a glass after coating processing, then using 1H,1H,2H,2H-Perfluorooctyltrimethoxysilane and absolute ethyl alcohol to soak the glass, and finally taking out the glass and drying the glass so as to obtain the glass antifogging coating. According to the preparing method of the glass antifogging coating, the glass antifogging coating has a strong hydrophobic characteristic and a strong self-cleaning ability; meanwhile, the coating has good durability and strong adhesive force; in addition, the coating good antifogging performance, under the vapor environment, completely no fogdrop adheres to the surface of the coating glass, thus the use value of the glass is sharply improved, and the glass antifogging coating has a broad application prospect.

The invention belongs to the technical field of unshaped refractory materials, and specifically relates to a tundish magnesia coating material prepared by using waste magnesium aluminum spinel as a raw material and a method. The waste magnesium aluminum spinel is obtained in two ways: waste magnesium aluminum spinel bricks or preformed units produced in a production process of a refractory material enterprise are prepared into the waste magnesium aluminum spinel with the particle diameter of 3-0 mm through sorting and crushing; waste magnesium aluminum spinel bricks or preformed units after use by steel mills are prepared into the waste magnesium aluminum spinel with the particle diameter of 3-0 mm through deslagging, sorting and crushing; the waste magnesium aluminum spinels obtained through the two ways are mixed according to the ratio of (1.5:1) to (1:1.5), and then are sieved to obtain waste magnesium aluminum spinel particles of two kinds of particle diameters of 3-1 mm and 1-0 mm; the waste magnesium aluminum spinel particles are taken as a raw material to be added with a binder, a plasticizer, a water reducer, an anti-knock agent, and the like at the same time to develop the tundish coating material which is stable in performance, high in strength, excellent in construction performance and low in cost; the cyclic utilization of waste refractory materials is realized; the enterprise production cost is lowered.

The invention relates to a water hose for firefighting and a preparation method thereof. The water hose for the firefighting comprises a cylindrical weaving layer at the outer layer and a rubber liner, wherein the rubber liner is prepared by the following raw materials: polyvinyl chloride, acrylic rubber, a compound stabilizer, titanium oxide powder, paraffin wax, white carbon black, an activator, light calcium carbonate, a plasticizer, a binder, a vulcanizing agent and an antioxidant. The water hose for firefighting, provided by the invention, has the advantages that: the high temperature resistance and high pressure resistance are achieved; the adhesive strength of the liner and the outer weaving layer is high so that the liner and the outer weaving layer are not easy to strip, aging resistance is provided; and the service life is long.

The invention discloses a method for protecting an anti-corrosion layer of a pipeline during horizontal directional drilling crossing in oil and gas engineering. By the method, the completeness of the anti-corrosion layer of the pipeline in the horizontal directional drilling crossing process can be protected, the anti-corrosion layer is prevented from being scratched, and the operating safety and reliability of the pipeline are improved. The method can be also applied to protection of the anti-corrosion layer of a ground buried pipeline in rock sections of mountain areas. The method has the advantages that: an epoxy glass steel protection layer is high in hardness and good in anti-scratching performance; with a matched technology, the epoxy glass steel protection layer can be well bondedwith the anti-corrosion layer of the pipeline and is difficult to peel in the crossing process; special requirements for anti-corrosion materials of the pipeline and the surface of the materials are avoided; epoxy resin is solidified at normal temperature, and the protection layer is simple and convenient to construct; a weld crater repair part of the pipeline is easy to construct and a damaged part of the protection layer is easy to repair by using the epoxy glass steel protection layer; operation is simple and convenient; the completeness of the anti-corrosion layer of the pipeline of a horizontal directional drilling crossing section can be effectively guaranteed; and the reliability of safe operation of the pipeline is improved.

A copper electroplating apparatus is disclosed. The copper electroplating apparatus includes: a plating bath configured to hold a plating solution therein; a soluble anode of phosphorus-containing copper; a substrate holder configured to hold a substrate; an anode bag that surrounds the anode, the anode bag being formed of mesh; a regulation plate configured to regulate an electric field, the regulation plate having an opening and being disposed between the anode and the substrate held by the substrate holder; and a diaphragm disposed so as to dose the opening of the regulation plate, the diaphragm being configured to allow permeation of metal ions therethrough and not allow permeation of additives contained in the plating solution.

The invention provides a steel beam grid floor formwork system, wherein a plurality of early removed steel supports and a plurality of late removed steel supports are evenly arranged on a bottom floor; the top end of an internal sleeve of each early removed steel support is provided with a jack; a plurality of rows of square steel beams are paved on the jacks in the transverse direction; and a plurality of rows of n-shaped steel beams are evenly arranged on the square steel beams in the longitudinal direction; faceplates are paved on the n-shaped steel beams; all the faceplates are arranged between collected strip clearances; late removed strips are paved in the longitudinal direction; and clearance plates are paved in the transverse direction; the bottom faces of the late removed strips are directly supported by the late removed steel supports; and longitudinal and transverse horizontal steel pull rods are buckled with the internal sleeves of all the steel supports through fasteners. Having the serialized structure sizes, the n-shaped steel beams, the square steel beams and the faceplates are convenient to use, and have great structural strength and high safety coefficient; and additionally, the n-shaped steel beams, the square steel beams and the faceplates are difficultly damaged so as to be reused for multiple times. The new type faceplates are low in toxicity and great in surface hardness, and are reused for multiple times which are three times that of the traditional faceplates. When the steel beam grid floor formwork system is used, the construction speed is high, the materials and the woods are saved, the environmental pollution level is low, less support steel is used, and the project cost is low.

The invention discloses a metal furniture coating. Components of the metal furniture coating comprises, by weight, 70-80 parts of acrylic resin, 20-25 parts of polyvinylidene fluoride, 10-15 parts of titanium dioxide, 30-45 parts of polymethyl methacrylate, 5-10 parts of pigment, 40-50 parts of epoxidation poly dibutene resin, 5-10 parts of surface active agents, 10-20 parts of silicon dioxide fine powder, 20-30 parts of ethyl acrylate and 25-30 parts of crylic acid-2- phthalic acid ester. The paint surface of the coating is flat and smooth, the coating adhesive force is strong, the coating is not easily peeled off, peeling can not occur, the coating resists abrasion, and acid and alkali corrosion, salt fog resistance is excellent, the coating resists heat and cold, the service life is long, and the coating can be widely produced and continuously replace an existing material.

The invention discloses a maintenance construction method of an asphalt road surface solid permeability wearing layer. The construction method includes the following steps that the spreading amount ofa solid permeability agent is surveyed; a road surface is cleaned; the road surface is pre-processed; the solid permeability agent is sprayed; a wearing layer is spread; manual trimming is carried out; preliminary maintenance is carried out. According to the maintenance construction method, the solid permeability agent is demulsified immediately after being atomized or smeared on the original road surface, heavy cycloparaffin distilled oil rapidly infiltrates to restore old asphalt performance, early diseases of the original asphalt road surface are repaired, and meanwhile a matrix asphalt and tackifier mixture is left on the road surface to form a binding layer. A solid permeability layer is formed by the repaired original asphalt road surface and the binding layer. The maintenance construction method is high in construction speed and efficiency.

An energy-saving light brick for non-bearing wall is made up of the sludge or slit in river or lake (80-95%) and the dust or particles of combustible organic substance (5-20%) through mixing, shaping and sintering. Its advantages are light weight, good heat insulation and easy machining.

The invention discloses a chip-scale package light emitting device and a manufacturing method thereof. The light emitting device comprises a flip-chip LED chip and a package structure, wherein the package structure comprises a flexible buffer structure, a fluorescent structure and a transmitting structure, the flexible buffer structure comprises a top part and a side part, the top part is formed on an upper surface of the flip-chip LED chip, the side part is formed on a three-dimensional surface of the flip-chip LED chip, the top part is provided with a convex curved surface, the side part is provided with an outer edge surface, the outer edge surface is connected with the convex curved surface, the fluorescent structure is formed on the flexible buffer structure along the convex curved surface and the outer edge surface, the transmitting structure is formed on the fluorescent structure, and the hardness of the transmitting structure is not smaller than the hardness of the flexible buffer structure. Therefore, the flip-chip LED chip and the package structure have relatively excellent adhesion performance, and the light emitting device has relatively excellent reliability, space color uniformity, color temperature classification concentration and light emitting efficiency.

A foldable cellular phone includes a first housing, a first protruding portion, a second housing, and a second protruding portion. The first housing includes a first hinge part, the first protruding portion being disposed on the first hinge part. The second housing includes a second hinge part, the second protruding portion being disposed in the second hinge part. The first hinge part and the second hinge part couple with each other as a hinge. When the second housing rotates around the hinge relatively to the first housing, the second protruding portion corresponding to the first protruding portion is capable of acting as a stopper to stop the movement of the first protruding portion. Subsequently, the second housing is in a flip position with a predetermined maximum angle.