44results about How to "Improve drop resistance" patented technology

The utility model provides a waterproof and drop-resistant express bag convenient for secondary use. The waterproof and drop-resistant express bag comprises a paper bag body with a bag opening and a tongue opening used for sealing the bag opening, folding handles which can be movably turned out of a bag opening are arranged on the two sides in the paper bag body; the section of the paper bag body sequentially comprises a first functional layer, a paper base material layer and a second functional layer from inside to outside, and the second functional layer is a waterproof layer. The express bag has the advantages that the paper base material layer is matched with the second functional layer, so that the waterproof and anti-falling performance of the express bag can be effectively improved, and the express bag is not prone to being abraded and damaged in the transportation process or in cloudy and rainy days; and meanwhile, after the bag opening is opened to take out the express, the folding handle can be turned out of the bag opening to form a hand bag, so that secondary use of the express bag can be well realized, and resource waste is avoided.

The utility model relates to the technical field of conveying, and discloses a belt conveyor with an anti-falling structure, two transverse frames are fixedly connected to the outer wall of a rack, a conveying belt convenient for conveying plates is arranged between the two transverse frames, and two fixing frames are fixedly connected to the side outer walls of the two transverse frames; the outer walls of the two fixing frames are both connected with adjusting rods in a sliding mode, one side of each adjusting rod is provided with a guide baffle, the guide baffle is fixedly connected with the two adjusting rods, and the outer walls of the fixing frames are provided with limiting assemblies for fixing the adjusting rods. And a good anti-falling effect is achieved, and the application range of the belt conveyor is widened.

The embodiment of the application relates to the technical field of ice making equipment, in particular to an ice maker, which comprises a shell, an inner container, a compressor, a condenser, an evaporator, a first support and a reinforcing piece; the inner container is arranged in the shell and is provided with an ice making area; the compressor is arranged in the shell; the condenser is arranged in the shell; the evaporator comprises a main pipeline, an air inlet pipe and an air outlet pipe; the main pipeline is located in the ice making area; the air inlet pipe is connected between the main pipeline and the condenser; the air outlet pipe is connected between the main pipeline and the compressor; the first support is arranged on the inner container; and the reinforcing piece is connected between the first support and the main pipeline. Since the reinforcing piece connects the main pipeline and the first support arranged on the inner container, when the ice maker falls, the reinforcing piece can fix the position of the main pipeline in cooperation with the first support, so that the stability of the main pipeline is improved, displacement of the evaporator can be avoided as much as possible, and the overall anti-falling performance and stability of the ice maker are improved.

The utility model discloses a packaging barrel with a buffering protection function. The packaging barrel comprises an outer-layer protection frame, a plastic inner container, a top buffering assembly, a lateral buffering layer and a bottom damping mechanism. The outer-layer protective frame is of a metal grid structure, and the plastic inner container is arranged in the outer-layer protective frame. The top buffering assembly is composed of a plurality of elastic arch-shaped supporting plates, the arch-shaped supporting plates are formed by welding rectangular pipes, and the tops of the arch-shaped supporting plates are provided with arc-shaped aluminum plates for connection. The lateral buffer layer is composed of two layers of foam material plates, and a corrugated structure is arranged between the two layers of foam material plates and embedded in the inner side of the metal grid structure. The bottom shock absorption mechanism comprises composite structure shock absorption supports arranged at the four corners and deformable rib plates arranged in a radial shape and is used for enhancing the shock resistance and energy absorption capacity. The container barrel is reasonable in structure, the impact resistance of the container barrel in the transportation and carrying process is effectively improved, the inner container is prevented from being damaged or leaking, and transportation safety is guaranteed.

The backlight direct display module comprises a cover plate, one side of the back face of the cover plate is directly connected with the backlight module into a whole, and a liquid crystal display module is not arranged between the cover plate and the backlight module. The cover plate structurally comprises a cover plate body, a black shading ink layer and a semi-permeable ink layer which are stacked in sequence; the black shading ink layer covers partial area of the back surface of the cover plate body, and the area, not covered by the black shading ink layer, of the back surface of the cover plate body forms a plurality of hollow areas, so that the cover plate forms a display area and a non-display area; the semi-permeable ink layer covers the black shading ink layer and the plurality of hollow areas; the backlight module comprises a plurality of LED lamps which are independently controlled; a light-emitting side of the backlight module is provided with a light-shielding layer used for being attached to the cover plate, and hollowed-out parts are arranged on the light-shielding layer and correspond to the hollowed-out areas in position. According to the utility model, the performance of the display module is improved and the manufacturing cost is reduced while the simple display requirement is met.

The utility model discloses a kind of panoramic lighting lamps with flexible anti-falling bionical lamp petals, including lamp pole, the upper and lower sides of the lamp pole are respectively provided with lamp body and base;The lamp body includes: fixed seat fixed in the top of lamp pole, the lower of the fixed seat is equipped with the sliding base along the sliding of lamp pole;Bionical lamp pet device, the bionical lamp pet device includes at least two adjustable lamp petals, the end of each lamp pet is connected with the outer periphery of the sliding base by hinged member, adjusting assembly is equipped between the inner side middle section of the lamp pet and the outer wall of lamp holder, for supporting the opening angle of lamp pet;Light source module, be in lamp pet, for providing illumination.The utility model belongs to the technical field of lighting lamp, specifically provides a kind of for solving the defect that lighting angle is fixed in prior art, cannot be flexibly adjusted according to scene light domain.

The utility model discloses an anti-drop standing pouch which comprises a packaging bag and a packaging inner layer, a label is arranged on the front face of the packaging bag, a sealing strip is arranged on the front face of the packaging bag, a tearing opening is formed in one side of the packaging bag, a hanging groove is formed in the front face of the packaging bag, a front face protruding strip is arranged on the front face of the packaging bag, and a back face protruding strip is arranged on the back face of the packaging bag. A back protruding strip is arranged on the back face of the packaging bag, an anti-falling pad is pasted to the bottom of the packaging bag, an adhesive layer is arranged on the top of the anti-falling pad, and an inner protruding part is arranged on the inner bottom wall of the packaging inner layer, so that the anti-falling performance of the bottom of the standing bag can be improved, and the standing bag can be stably placed on a table top; the situation that snacks at the bottom are extruded by force and broken when the whole self-standing bag is thin is avoided, meanwhile, the front protruding strips and the back protruding strips are arranged on the front portion and the back portion of the self-standing bag, the anti-falling effect can be improved when the packaging bag is turned over, the self-standing bag is durable, and the problem that an existing self-standing bag is not resistant to falling is solved.

The invention relates to the technical field of firework cylinders, in particular to a firework mold pressing cylinder based on cassava flour pregelatinization and a preparation method thereof, and the mold pressing cylinder is prepared from the following raw materials in parts by weight: a framework material compounded by crystal transformation method II type anhydrous gypsum and calcium carbonate stone powder, pregelatinized cassava flour, wood fibers, stearic acid and a proper amount of water. The tapioca flour is pre-gelatinized by warm water at 40-60 DEG C, and the pre-gelatinization degree is greater than or equal to 80 The crystal transformation method II type anhydrous gypsum is prepared from ardealite through a low-temperature crystal transformation method. The preparation method comprises the following steps: pre-gelatinizing the tapioca flour, pulping, mixing with other dry blends and hot water, and finally carrying out high-temperature compression molding. Through the synergistic effect of the pre-gelatinized tapioca flour and the crystal transformation method gypsum, the dry basis dosage of the tapioca flour is remarkably reduced, meanwhile, the compressive strength and the falling resistance of the mold pressing barrel are greatly improved, the multiple purposes of reducing the cost, improving the performance and absorbing industrial solid waste phosphogypsum are achieved, the product quality is stable, and the mold pressing barrel is suitable for industrial production.

The utility model discloses a kind of anti-falling large-capacity ceramic storage tanks, including high-density ceramic inner container, ceramic inner container surface covers glaze layer, its outside is coated with protective shell, protective shell is TPU or silica gel material, protective shell is upper and lower opening structure, the gap between protective shell and ceramic inner container is filled with polyurethane foaming buffer layer, ceramic inner container, buffer layer and the top connecting place of protective shell are fixed using buckle assembly, the bottom of protective shell is connected with pedestal, the overall area of pedestal is greater than ceramic inner container, and the center point of pedestal and ceramic inner container coincides and extends to outside, by the composite structure setting of buffer layer and protective shell, the step-by-step absorption of impact energy is realized, effectively improve the anti-drop performance of ceramic storage tank. Through material composite, bionic structure, gravity control three aspects of setting, while ensuring the anti-falling performance of ceramic storage tank, realize the reduction of component quantity and cost reduction, have remarkable advantage in market popularization.

The application discloses an epoxy resin composite Sn-Bi-Sb lead-free soldering paste and a preparation method thereof, and belongs to the field of soldering materials of metal materials and metallurgy. The epoxy resin composite Sn-Bi-Sb lead-free soldering paste is composed of 3-6% of a mixture of an epoxy resin, a curing agent and an accelerator, 1.5-5.0% of nano silver paste, and the balance of a commercial Sn-Bi-Sb soldering paste. In the mixture of the epoxy resin, the curing agent and the accelerator, the mass percentage of each component in the composition is epoxy resin: curing agent: accelerator = 100: 70-85: 4-9. The epoxy resin composite Sn-Bi-Sb lead-free soldering paste has good wetting and spreading performance, can significantly improve the shear strength and drop resistance of a soldering joint, and can be used for reflow soldering of some products in the electronic industry which have specific requirements for temperature and drop resistance.

This utility model relates to a leading edge skin for an unmanned aerial vehicle (UAV), comprising a core material and inner and outer panels. The panels and the core material form a sandwich structure. A solar panel is connected to the upper surface of the outer panel of the core material. A recessed area is provided on the upper surface of the outer panel of the core material to accommodate the solar panel. A weight reduction structure is provided on the core material and / or at least one panel.

The invention discloses a flashlight, which relates to the technical field of lighting equipment, and comprises a lamp tube, a circuit board, an energy storage part and a bottom cover, a mounting opening is formed in the other end of the lamp tube; the circuit board and the energy storage piece are sequentially installed in the lamp barrel from the installation opening. The bottom cover is inserted into the installation opening, abuts against the energy storage piece and does not protrude out of the installation opening. According to the technical scheme, the anti-falling capacity of the flashlight is improved, and the use stability of the flashlight is guaranteed.

The utility model relates to the technical field of plastic shaking cups, in particular to a plastic shaking cup with good protection performance, which comprises a shaking cup component, a sealing cover component and a stainless steel stirring ball, a sealing cover assembly is arranged at the upper end of the shaking cup assembly; a stainless steel stirring ball is arranged in the shaking cup assembly; the shaking cup assembly comprises a cup body, an annular rubber ring filler, a reinforcing steel ring and an elastic rubber gasket; the sealing cover assembly comprises a sealing cover, a sealing plug and a rubber belt. The structural strength of the cup body is improved through the structure that the cup body, the annular rubber ring filled in the cup wall of the cup body and the reinforcing steel ring are subjected to integrated injection molding, the protection performance of the cup body is improved, the cup body is prevented from being broken, and the anti-falling performance of the cup body is enhanced through the reinforcing steel ring filled in the annular rubber ring.

The present application relates to the technical field of glass preparation, and discloses a glass forming method, glass and application thereof. The method comprises the following steps: introducing glass liquid into a tin bath containing tin liquid in the presence of protective gas, the tin bath is sequentially provided with a weeding area, a cooling A area and a cooling B area along the length direction, and the glass liquid solidifies after flowing through the weeding area, the cooling A area and the cooling B area on the surface of the tin liquid in sequence to obtain glass. The glass prepared by the method has surface compressive stress not less than 870 MPa, stress layer depth not less than 30 microns, and surface warping not higher than 0.13 mm, and can be applied to a flat display device as a cover plate glass, and the cover plate glass has good drop resistance.

The utility model relates to camera technical field discloses an integral type camera module, including chip subassembly, chip subassembly includes circuit board, image sensor, support and light filter, image sensor is located on the upper end of circuit board, support is located on the upper end of image sensor, and support lower extreme is located in the non -photosensitive area of image sensor, the one end away from circuit board of support is provided with the mounting groove, light filter is located in the mounting groove, the lower end of support is provided with annular groove, the one end away from circuit board of support is provided with the through -hole of the intercommunication of annular groove, the one end away from circuit board of support is provided with the exhaust hole of the intercommunication of annular groove, through the through -hole injects the glue in annular groove to fixed mounting on the upper end of image sensor with support;Through setting up support in the non -photosensitive area of image sensor, avoid the support to occupy the placing space of circuit board component, improve the space utilization of circuit board to reduce the volume in the X / Y direction of circuit board, and then reduce the volume of camera module.

The invention relates to the technical field of fire fighting, and provides a durable anti-falling fire extinguisher. The fire extinguisher comprises an aerogel tank body, a spraying channel, a pressing nozzle and a durable anti-falling assembly. The durable anti-falling assembly comprises a rotating rod extending into the tank body, a stirring piece and a driving conversion mechanism for converting external impact into power of the rotating rod. Impact energy such as vibration and falling borne by the fire extinguisher in use and transportation is ingeniously converted into power for driving an internal stirring part to rotate through a mechanical structure, so that an aerogel fire extinguishing agent is continuously stirred, deposition failure of key components is prevented, and the storage life of the fire extinguishing agent is remarkably prolonged to more than 10 years. Meanwhile, impact energy is consumed in the energy conversion process, and the buffering and falling preventing performance is enhanced. Preferably, a self-adaptive buffer assembly based on magnetorheological fluid can be further arranged to cope with extreme impact. According to the invention, the unification of fire extinguishing efficiency persistence and physical durability is realized, and the method is particularly suitable for vehicle-mounted and other scenes with mobile and high-reliability requirements.

The present application relates to the technical field of automatic control of aircraft, solve the problem that the unmanned aerial vehicle cannot realize the hovering at a fixed point when the precision of height fixing is insufficient and the GPS signal is poor, especially relates to a lightweight four-rotor unmanned aerial vehicle and a control method thereof, the control method comprises the control of the attitude of the unmanned aerial vehicle, the control of the height of the unmanned aerial vehicle and the position fixing control of the unmanned aerial vehicle, and after realizing the control of the attitude of the unmanned aerial vehicle, the control of the height of the unmanned aerial vehicle and the position fixing control of the unmanned aerial vehicle, a protection mechanism is executed according to the signal state of the unmanned aerial vehicle based on a safety protection algorithm. The control method can realize high-precision position fixing and unmanned aerial vehicle optical flow fixing effect. At the same time, a safety protection algorithm of the unmanned aerial vehicle is designed, the signal state of the unmanned aerial vehicle is identified through the algorithm, and the unmanned aerial vehicle can land smoothly after the remote control signal of the unmanned aerial vehicle is lost.

This invention provides a manually directional toy car, relating to the field of toy car technology. It includes a chassis with a rear wheel assembly, a drive mechanism, and a front wheel assembly mounted on it. The rear wheel assembly is mounted at the rear of the chassis and is connected to the drive mechanism. The output end of the drive mechanism is connected to the drive wheel axle of the rear wheel assembly. The front wheel assembly is mounted at the front of the chassis. It also includes a steering wheel, rotatably mounted on a wheel frame, which is rotatably mounted on the chassis. This invention achieves automatic rotation through the coordinated action of the tilted steering wheel and the rear wheel assembly. An adjustment frame drives the wheel frame to rotate, thereby changing the tilt angle of the steering wheel and adjusting the toy car's rotation radius, enriching the play modes and improving the toy car's playability. This invention achieves automatic rotation through a purely mechanical transmission design, eliminating the need for a remote control or battery power, thus extending the toy car's lifespan.

The application discloses a cover plate display module easy to be installed by a mechanical hand, which comprises a shell cover and a shell main body base matched with the shell cover, the shell main body base is a hollow cavity with an opening, and the hollow cavity is sequentially provided with a glass cover plate body, a display layer and a backlight layer from top to bottom. The periphery edge of the glass cover plate body is attached to the inner wall of the hollow cavity, and the upper surface of the glass cover plate body is basically level with or slightly lower than the upper end surface of the shell main body base; an inclined groove for inserting the mechanical hand is arranged at the upper end surface of the hollow cavity, the inclined groove is formed with an inclined surface arranged in an inclined mode, and an acute angle is formed between the inclined surface and the side edge of the glass cover plate body, so that the mechanical hand is fully contacted with the side edge after being inserted into the inclined groove, the friction force is enhanced, and the glass cover plate body is convenient to grab and place. The design is different from the traditional mode of only relying on the upper surface of the glass to be adsorbed or clamped, can effectively avoid the grabbing deviation, improve the alignment accuracy, and improve the assembly speed and the one-time assembly success rate.

The utility model belongs to waterproof bag technical field discloses a kind of mobile equipment waterproof bag, wherein, including including waterproof bag body and the sealing element of waterproof bag body's bag mouth inside, sealing element is used to seal waterproof bag body, the internal space of waterproof bag body is formed with the accommodating cavity for mobile equipment placement, waterproof bag body expands to form air cavity outward, the height of air cavity is greater than mobile equipment;Wherein, the air cavity is along the edge of the accommodating cavity is arranged, and the air cavity with the accommodating cavity is not communicated;The utility model is by setting sealing element on waterproof bag body and forms the air cavity that expands outward, sealing element seals, the design of air cavity not only guarantees the waterproof sealing property inside bag body, also makes waterproof bag in water can keep the state of floating, prevent mobile equipment sinking;Meanwhile, air cavity can also be used as buffer layer, effectively absorb external impact force, improve the anti-drop performance, to significantly enhance the safety of mobile equipment in water activity and daily use.

The utility model relates to the technical field of keyboards, in particular to a computer keyboard with good anti-falling performance, which comprises a lower shell and a PCB (printed circuit board) arranged in the lower shell, an upper shell is arranged on the lower shell, a keycap is arranged on the PCB through a key shaft, a limiting plate is further arranged in the lower shell, and the limiting plate is arranged on the lower shell. The four corners of the lower shell are slidably connected with movable sleeves, the bottom end of each movable sleeve is provided with a supporting block, and the movable sleeves are divided into three hollow long movable sleeves and a short movable sleeve located at the lower left corner. When the keyboard is flapped, a desktop does not extrude the keycaps to limit positions to cause collision, so that the contact positions of the keycaps and the key shafts are not damaged, the damage of the keyboard caused by collision is reduced in the flapping process, the anti-falling performance is improved, the side edge of the lower shell is made of metal, the damage caused by collision is avoided, and the service life of the keyboard is prolonged. And the anti-falling performance is further improved.

The application provides a high-temperature and high-humidity resistant epoxy magnetic circuit adhesive and a preparation method thereof. The adhesive comprises the following raw materials: bisphenol type epoxy resin, tetra-functional silicon-based epoxy resin with a structure as shown in formula I, toughening agent, mercaptan curing agent, latent curing accelerator, filler, tackifier and thixotropic agent. The tetra-functional silicon-based epoxy resin with a structure as shown in formula I is used to replace part of the bisphenol type epoxy resin, which can improve the crosslinking density of the magnetic circuit adhesive and the heat resistance, and reduce the hydrophilicity of the magnetic circuit adhesive, so that the magnetic circuit adhesive is not easy to soften in a high-temperature and high-humidity environment, and the durability is improved. The inventors find that the tetra-functional silicon-based epoxy resin with a structure as shown in formula I and the polysulfide rubber toughening agent have a synergistic effect of improving the anti-shock and anti-falling performance of the magnetic circuit adhesive.

The utility model discloses a kind of double-layer anti-reflux sealing structures of regenerative ink cartridge, belong to printer consumables technical field, including storage box, ink adding port and ink outlet, further include anti-reflux mechanism and protection mechanism, anti-reflux mechanism includes check box, its inside rotationally connected with shaft, fixed with baffle and limiting plate on the shaft, the blocking block for abutting limiting plate is provided in check box inner wall, multiple check boxes are integrated by fixed frame, fixed frame is slidably connected using fixed plate and the fixed plate groove on storage box, protection mechanism is composed of honeycomb board of covering storage box and the buffer rubber pad of setting in box body four corners, and sealing cap, sealing column and sealing ring combination is used to seal ink outlet.The utility model solves the problem of ink backflow, poor protection and unreliable sealing, has the advantages of reliable anti-reflux, convenient installation and maintenance, strong anti-collision ability and good sealing.

The utility model discloses a redundant structure reinforced encoder housing, which comprises a housing, the bottom of the inner wall of the housing is used for fixedly connecting a video encoder, the front side of the housing is connected with an interface board, the rear side of the housing is connected with a rear baffle plate, and the inner part of the housing wall is fixedly connected with a silica gel layer. The inner wall of the silica gel layer is fixedly connected with a carbon fiber layer, the inner wall of the carbon fiber layer is fixedly connected with the shell, conductive powder coating is arranged on the outer surface of the shell, heat dissipation holes are formed in the left side and the right side of the shell, and mounting hole plates are fixedly connected to the lower positions of the left side and the right side of the shell. According to the utility model, firstly, the outer surface of the shell, the silica gel layer and the carbon fiber layer are used for absorbing impact force generated by collision, the impact force is prevented from being transmitted to the outer surface of the shell, and at the moment, the impact force generated by falling can be absorbed, so that the effect of good anti-falling effect is achieved.

The application provides a power generation equipment state multi-parameter cooperative monitor and a use method thereof, and comprises a monitor main body, a control mechanism arranged at the front end of the monitor main body, buffer mechanisms connected to the two sides of the monitor main body through connecting mechanisms, a heat dissipation mechanism arranged at the top of the monitor main body, and an external connecting mechanism arranged at the rear end of the monitor main body. The buffer mechanism comprises a vacuum box, extrusion blocks, a sliding frame, sliding blocks, connecting rods, fixed rods and a sensing assembly. Through the cooperative action of air compression damping and mechanical friction, a rigid-flexible composite buffer mechanism is formed, impact energy can be effectively decomposed and attenuated, and the drop resistance of the equipment is significantly improved. Meanwhile, when the sensing assembly senses the impact, the heat dissipation mechanism can be triggered to act, so that the heat dissipation leaves are rapidly closed, and dust intrusion is effectively prevented. The application solves the problems of insufficient buffer performance and weak dustproof ability of the existing monitor, and has the advantages of high reliability and convenient maintenance.

This invention discloses an optical imaging lens, comprising an outer cover, a lens barrel, and a plurality of lenses disposed within the lens barrel. The front end of the lens barrel includes an object-side opening, and the rear end includes an image-side opening. The inner diameter of the object-side opening is smaller than the inner diameter of the image-side opening. The outer cover is conical and disposed on the outer surface of the front end of the lens barrel. The outer cover includes an object-side opening and an image-side opening, the maximum outer diameter of which is smaller than the maximum outer diameter of the image-side opening. The length of the outer cover along the optical axis is greater than 40% of the length of the lens barrel along the optical axis.

The application discloses a portable moped battery structure and a use method thereof, and belongs to the technical field of batteries, wherein the inner side of a front cover and a rear cover is provided with a bottom shell bone position groove, the inner sides of the front cover are respectively provided with a support B and a support A, the support B and the support A are provided with a battery cell, the outer ends of the support B and the support A are provided with a limiting support rod, the outer sides of the support B and the support A are symmetrically provided with the bottom shell bone position groove, the inner circle of the front cover and the rear cover is provided with a positioning mutual sleeve, the positioning mutual sleeve in the middle end of the front cover and the rear cover is provided with a pin, the structure strength of the two side surfaces of the battery is enhanced, the battery PACK part is prevented from being squeezed when the battery is subjected to a squeezing test, and thus the safety and reliability of the battery are ensured, the support A and the support B are positioned by means of a screw column mutual sleeve positioning structure, there are eight locking screws in the whole circle, the drop resistance of the battery pack is enhanced, the PACK structure reliability of the battery is enhanced, the battery is convenient, fast and efficient to install, the bottom of the battery cell support A and the bottom of the battery cell support B are provided with a U-shaped positioning structure which is inserted into the bottom shell bone position groove and is provided with a mutual embedding structure.

This utility model discloses a drop-resistant ceramic cup, relating to the field of ceramic cup technology. It includes a ceramic cup body with a handle fixedly attached to one side. Multiple insertion blocks are fixedly attached to the outer wall of the ceramic cup body. A protective device is provided on the outer side of the ceramic cup body, comprising an upper protective ring and a lower protective ring. Insertion grooves are fixedly formed on the inner sides of the upper and lower protective rings. This utility model significantly improves the drop-resistant performance of ceramic cups, effectively reducing the probability of breakage upon drop and minimizing economic losses. The design of the outer protective structure does not affect the normal use of the ceramic cup while increasing its aesthetics and uniqueness. The anti-slip pad and sealing ring improve the stability and sealing of the cup during use. The structure is simple, easy to manufacture, and relatively low in cost, possessing good market prospects.

This invention provides a reinforced microcrystalline glass, its preparation method, and its application. The reinforced microcrystalline glass contains a lithium feldspar crystal phase and a lithium disilicate crystal phase. The reinforced microcrystalline glass has a compressive stress layer formed by chemical strengthening on its surface and a tensile stress layer inside. The reinforced microcrystalline glass satisfies the following conditions: (CS_50 / DOL_0)≥0.332×(surface CS / |CT_CV|); DOL_0≥0.187t; 1.01%≥Δα≥0.65%, Δα=5×10 ‑5 ×|CT_AV|+0.0026. Under 80-grit sandpaper conditions, the average drop failure height of the reinforced microcrystalline glass can reach 1.30–1.80 m. The reinforced microcrystalline glass of this invention has significantly improved drop resistance on rough surfaces compared to existing technologies and can be used as a protective cover material for smartphones and other smart terminal products.

The utility model provides a drop-resistant composite film and a packaging bag, the composite film is composed of a barrier layer, a composite layer and a heat sealing layer which are connected through a glue layer, the barrier layer can be made of materials such as a PET-AlOx film, the composite layer is made of NY or PET, and the heat sealing layer is a polyethylene cooking film. According to the composite film, a multi-stage embossing structure is designed, the multi-stage embossing structure comprises first embossing forming damping strips, second embossing forming an angle with the first embossing and third embossing embedded in a downward concave area of buffering patterns, a three-stage buffering gradient structure is jointly formed, stress is effectively dispersed, and the impact resistance is improved. In addition, the composite film can be made into a packaging bag and has good low-temperature impact resistance.