686 results about "Protective barrier" patented technology

The invention relates to the technical field of metal surface engineering, and discloses a laser cladding layer based on copper-magnesium-titanium-zirconium gradient design and a preparation method thereof.The preparation method comprises gradient structure design, a microstructure strengthening mechanism, a laser cladding process and thermal field control. By constructing a copper-magnesium-titanium component gradient transition structure and matching the thermal expansion coefficient difference between a matrix and a coating in real time, interface thermal stress accumulation can be dynamically inhibited, the crack defect caused by thermal expansion mismatch of a traditional cladding layer is avoided, ordered diffusion of elements at the interface is promoted through gradual change of gradient components, and the thermal conductivity of the cladding layer is improved. The metallurgical bonding reliability of the coating and a base body is improved, meanwhile, a stable coating is formed, the long-term service stability under the extreme working condition is guaranteed, a microstructure strengthening mechanism regulation and control means is adopted, the coating has a stable and effective protective barrier in a corrosive medium environment, and the problem of performance degradation caused by structure defects of a traditional cladding layer is solved.

Examples of devices for providing cooling solutions are described. One example device includes a boilerplate, a printed circuit board (PCB), one or more integrated circuit (IC) chips placed on the PCB, a thermal interface material (TIM), and one or more gaskets. The TIM is placed between the boilerplate and at least one IC chip of the one or more IC chips. The TIM is coupled to a surface of at least the IC chip that faces the boilerplate. The one or more gaskets are placed between the boilerplate and the PCB and encompassing the TIM. The one or more gaskets are configured to seal the at least one IC chip to provide a protective barrier for the TIM.

A protective barrier affixable to a curved substrate comprises a stack of two or more lenses, each of the two or more lenses including a polyethylene terephthalate (PET) film, a hard coat on a first side of the PET film, and an adhesive layer on a second side of the PET film opposite the first side. The stack of two or more lenses may have a modulation transfer function that exhibits a contrast value greater than 75% for a spatial resolution of one line-pair per 0.0003 radians at 65 degrees angle of incidence. Heat and pressure may be applied to conform the stack of two or more lenses to the shape of the curved substrate.

The tunneling and anchoring all-in-one machine shield system comprises a shield mechanism, the shield mechanism comprises a main frame body, a sliding top plate and a front probing piece, the sliding top plate is in sliding connection with the main frame body, and the front probing piece is used for driving the sliding top plate to move front and back; the sliding frame assembly is arranged between the main frame body and the sliding top plate, and the sliding frame assembly is in sliding connection with the sliding top plate; the wing ceiling assemblies are arranged on the two sides of the sliding top plate; the top end of the temporary supporting piece is connected with the left end and the right end of the sliding frame assembly, and the temporary supporting piece is telescopic; the top end of the supporting rod assembly is connected with the left side and the right side of the main frame body. The shield system can be arranged on the tunneling and anchoring integrated machine, the sliding top plate and the wing-unfolding ceiling assembly can stretch into an unsupported empty roof area in front of a tunneling working face in advance to form a temporary protection barrier, zero-empty-roof-distance advance supporting operation of a tunneling head-on is achieved, adaptability and reliability of underground tunneling operation to top plate control are improved, and the construction period is shortened. And safe and efficient operation of tunneling operation is ensured.

The invention relates to the technical field of transport vehicles, and discloses a new energy container transport semitrailer which comprises a semitrailer body and a container body hoisted above the semitrailer body. Two main beams are installed on the semi-trailer body, a plurality of cross beams are installed between the two main beams, loading blocks are installed in the cross beams, two inserting grooves are symmetrically formed in each loading block, a plurality of sets of inclined blocks are installed at the bottom of the box body, and each set of inclined blocks correspond to the two inserting grooves in the corresponding loading block. And two clamping pushing assemblies are arranged in the cross beam. The inclined blocks are matched with the protection assemblies, the clamping blocks and the limiting assemblies, guiding, fixing and limiting are achieved when the box body is hoisted and moves downwards, the lateral restraining force and the connecting strength are enhanced, the electromagnets are used for fixing the two sides of the bottom of the box body, the weight is evenly distributed, the main beam deformation risk is reduced, the pull ropes are matched with the protection assemblies to form a protection barrier, and safety is improved; the inclined block design avoids direct contact between the box body and the ground, and the service life is prolonged.

A method of lubricating a fluid production pump may include mixing a polarized lubricant with water to produce a diluted lubricant. The method may additionally include creating a flowpath within the fluid production pump. An initial volume of the diluted lubricant may be circulated within the flowpath to allow the diluted lubricant to react with components of the fluid production pump and form a protective barrier on the components of the fluid production pump. The method may further comprise repeatedly introducing a periodic volume of diluted lubricant into the fluid production pump according to a predefined lubrication schedule.

The invention relates to a supporting platform device for construction in a tunnel, a plurality of rectangular steel pipes are spliced and built into a supporting frame through prefabricated connecting pieces, a grid type walkway plate is laid on the supporting frame, and a detachable protective barrier is installed on the edge of the grid type walkway plate; the detachable protective handrails of the grid type walkway plate are connected with the supporting frame through buckles; adjustable supporting legs are arranged at the bottom of the supporting frame. According to the supporting platform device for construction in the tunnel, through organic combination and innovative design of the rectangular steel pipes, the connecting pieces and the grid type walkway plates, high strength and high stability of the device are guaranteed, and meanwhile the functions of rapid building, flexible adjustment, safety and reliability are achieved; the device has the remarkable advantages of being simple in structure, convenient and fast to install, low in cost, high in applicability and the like, can be widely applied to the construction process of various tunnel projects, provides powerful guarantee for efficient and safe tunnel construction, and has wide market application prospects and remarkable social and economic benefits.

The invention relates to the technical field of anti-aging coatings, in particular to a tire anti-aging coating and a preparation method thereof. According to the invention, the problems of poor adhesive force and poor aging resistance of a tire coating are solved; through the synergistic effect of the epoxy polysiloxane and the waterborne polyurethane-acrylate copolymer emulsion, multi-stage bonding of a tire / coating interface is realized, and the added fluorosilicone block copolymer can further form a protective barrier; by preparing modified nano silicon dioxide, active groups grafted by a silane coupling agent on the surface capture free radicals, and an oxidation chain reaction is blocked; n, N '-diphenyl-p-phenylenediamine released by the polyurea microcapsules can remove free radicals generated by oxidation in the coating, and the N, N'-diphenyl-p-phenylenediamine is matched with the compound light stabilizer to form a dynamic defense chain; a flexible long chain of the polycaprolactone polyol inhibits crack propagation through free volume filling, and the four components synergistically improve ultraviolet resistance, ozone resistance and oxidation corrosion resistance; and through a staged low temperature-medium temperature-high temperature gradient curing strategy, the adhesive force of the coating is improved.

The invention discloses an alkali-reducing protective agent for a reinforced cement-based cementing material for basalt fibers and application of the alkali-reducing protective agent, and belongs to the technical field of building materials. The alkali-reducing protective agent is prepared from the following raw materials in percentage by weight: 20 to 40 weight percent of active silicon dioxide aerogel, 15 to 30 weight percent of metakaolin, 10 to 25 weight percent of lithium slag powder, 5 to 15 weight percent of nano calcium carbonate, 3 to 8 weight percent of redispersible latex powder, 1 to 5 weight percent of water reducing agent and 0.5 to 2 weight percent of retarder. The invention also discloses an application of the alkali-reducing protective agent in a cement cementing material. According to the invention, the alkalinity of a set cement hole solution around the basalt fiber can be efficiently and enduringly reduced, physical and chemical dual protection barriers are formed on the surface of the basalt fiber, the alkali corrosion of the fiber is obviously delayed, and the long-term durability and enhancement efficiency of the basalt fiber are greatly improved.

The invention provides air purification equipment applied to wafer detection and a wafer detection system.The air purification equipment comprises a rack and an air supply part, an outer protection cavity, a light path cavity and a detection cavity are formed in the rack, the light path cavity and the detection cavity are formed in the outer protection cavity, and the air supply part communicates with the outer protection cavity, the light path cavity and the detection cavity; the air pressure in the detection cavity is greater than the air pressure in the light path cavity, and the air pressure in the light path cavity is greater than the air pressure in the outer protection cavity. The light path cavity and the detection cavity are arranged in the outer protection cavity, and a gradient air pressure system in which the air pressure of the detection cavity is higher than that of the light path cavity and the air pressure of the light path cavity is higher than that of the outer protection cavity is constructed, so that multiple protection barriers are formed, external pollutants are effectively prevented from invading a core working area, and the cleanliness control effect is improved; and the requirement of nanoscale wafer detection on the environment is met.

The invention provides a tailored blank laser welding device for a car body panel production line, and relates to the technical field of tailored blank laser welding devices. A mounting part is arranged outside the external connecting part; a cleaning part is arranged outside the mounting part; a gun protection part is arranged outside the mounting part; a welding part is arranged in the gun protection part; when the welding head retracts, the six outwards-turned plastic plates fixedly connected with the inner wall can be rapidly closed to form a tight protective barrier, external impurities are effectively prevented from being attached to the welding head, interference of the impurities on laser transmission, focusing and other performance is avoided, the service life of the welding head is greatly prolonged, and the problem that in the continuous machining process, the welding head cannot be damaged easily is solved. The problems that due to the fact that a laser gun head is exposed in the machining environment for a long time, metal splashes, smoke dust and other impurities generated by welding are easily adsorbed, the laser energy transmission efficiency can be reduced through the impurities, the performance of the gun head is degraded, and even faults are caused are solved.

A method of lubricating a fluid production pump may include mixing a polarized lubricant with water to produce a diluted lubricant. The method may additionally include creating a flowpath within the fluid production pump. An initial volume of the diluted lubricant may be circulated within the flowpath to allow the diluted lubricant to react with components of the fluid production pump and form a protective barrier on the components of the fluid production pump. The method may further comprise repeatedly introducing a periodic volume of diluted lubricant into the fluid production pump according to a predefined lubrication schedule.

There is provided a medicament delivery device comprising: a main body arranged to receive a medicament cartridge; a needle for delivery of medicament from the medicament cartridge; a needle cover moveable between an initial position, in which the needle cover covers the needle, and an activated position for dispensing medicament from the medicament delivery device, wherein in the activated position the needle protrudes from a distal end of the needle cover; an outer frame, moveable relative to the main body between an extended position in which the outer frame extends past a distal end of the needle, and a retracted position in which the outer frame is moved towards the main body; an attachment element comprising an adhesive region for attaching the medicament delivery device to a surface when the needle cover is in the activated position, the attachment element comprising a protective barrier covering the adhesive region.

The utility model discloses a polyurethane watertight photoelectric composite cable, and relates to the technical field of watertight photoelectric composite cables. The composite cable comprises the outer sheath, the inner sheath, the optical fiber unit and the power line, the inner sheath is arranged in the outer sheath, the overall use strength of the composite cable is improved through the outer sheath and the inner sheath, and the armor layer is arranged between the outer sheath and the inner sheath, so that even if the outer sheath is broken, the optical fiber unit can be prevented from being damaged, and the service life of the composite cable is prolonged. The inner sheath is protected through the armor layer, the first water-blocking tape is made of a material formed by compounding polyester fibers and a high-water-absorption material after meeting water, and when water enters a cable port using the water-blocking tape, high-water-absorption powder or a water-swelling material contained in the water-blocking tape can absorb the water through the water absorption performance of the high-water-absorption powder or the water-swelling material. And the water-blocking tape expands to become gel to form a protective barrier for preventing water from flowing, namely, the protective barrier performs waterproof protection between the broken part of the outer sheath and the armor layer.

The invention relates to the field of cables, and discloses a high-voltage fire-resistant cable, which comprises an outer layer, a skeleton structure is arranged in the outer layer, a plurality of groups of wire cores are arranged between the skeleton structure and the outer layer at equal intervals, and a reinforcing core is arranged in the skeleton structure. A middle fireproof layer adopts a ceramic silicone rubber composite system (containing 25 parts of phlogopite, 8 parts of nanometer aluminum oxide and a ceramic accelerant) with an optimized proportion, a hard protective shell with the density being larger than or equal to 1.8 g / cm < 3 > can be rapidly ceramized at the temperature of 320 DEG C, the synergistic flame-retardant effect of surface layer high-flame-retardant PVC (the oxygen index is 32) is matched, and the flame-retardant effect is good; the cable can continuously block heat permeation in flame of 950-1000 DEG C for 180 minutes, the temperature of the inner layer is stably controlled to be below 180 DEG C and is far lower than the insulation tolerance limit of a cable core, the pain point of'rapid failure in fire 'of a traditional cable is thoroughly solved, and golden rescue time is won for power emergency guarantee in key scenes such as high-rise buildings and subway tunnels.

The invention discloses a modular hot cell, and relates to the technical field of radiation experiments. The hot cell comprises: a base; a shielding body, wherein the shielding body is arranged on the base; the shielding body is arranged on the base, the shell is arranged on the base, and the shell is located in the shielding body; part of the passing assembly is arranged on the shielding body, and part of the passing assembly is arranged on the shell; a part of the observation assembly is arranged on the shielding body, and a part of the observation assembly is arranged on the shell. According to the modularized hot chamber, through the modularized splicing structure of the base, the shielding body and the shell, the construction efficiency of the hot chamber is remarkably improved, the nested design of the shielding body and the shell forms a multiple radiation protection barrier, and the radiation leakage amount is controlled to be at an extremely low level while the operation visibility of personnel is guaranteed. According to the invention, a user can inspect the damaged fuel element at the first time, and the efficiency and reliability of fuel element damage inspection and analysis are improved.

The invention discloses a flexible wear-resistant charging cable, and relates to the technical field of charging cables. The first cable protection section and the second cable protection section both wrap the outer surface of the cable main core, the first cable protection section and the second cable protection section are fixedly connected through a connecting leather sheath, and the outer surface of the first cable protection section is sleeved with an anti-abrasion wrapping layer used for increasing abrasion resistance. The upper surface of the second cable protection section is sleeved with an upper wrapping layer with the same function as the anti-abrasion wrapping layer. The silica gel folding-resistant strips are fixedly connected to the inner wall of the first protection section of the cable, the surface of the second protection section of the cable is provided with a wear-resistant assembly, and the silica gel folding-resistant strips are annularly distributed along the inner wall of the first protection section of the cable at equal intervals, so that fatigue fracture caused by local stress concentration is avoided; the upper wrapping layer and the lower wrapping layer respectively resist upper scraping and lower friction to form a bidirectional protective barrier, the wear-resistant blocks on the surface of the lower wrapping layer prevent the sheath layer from directly contacting with the ground, and the service life of the sheath is prolonged.

The invention discloses an interface evaporation seawater desalination device based on an armor Janus structure and a preparation method, and relates to the technical field of seawater desalination devices.The device comprises a black copper net frame and a carbon nano tube sponge, the carbon nano tube sponge is filled in the black copper net frame, the black copper net frame is made of a super-hydrophobic material, and the carbon nano tube sponge is filled in the black copper net frame. The carbon nanotube sponge is made of a super-hydrophilic material; the super-hydrophilic carbon nanotube sponge on the inner layer can quickly adsorb and transmit seawater by virtue of excellent hydrophilicity and a porous network structure, and a water micro-channel penetrating through the whole body is efficiently constructed; the super-hydrophobic black copper net on the outer layer is like a protective barrier, and the super-hydrophobic characteristic of the surface of the super-hydrophobic black copper net can remarkably reduce the adhesive force between seawater and the net surface, so that salt crystals possibly separated out in the evaporation process are difficult to adhere to the surface of the super-hydrophobic black copper net, and the problem of interface blockage caused by accumulation of the salt crystals is effectively avoided.

The utility model relates to the technical field of concrete detection, and discloses a concrete compressive strength detection device which comprises a base station, a pressing head; testing a bench; the protection assembly comprises protection main bodies, insertion plates and guide rods, the guide rods are fixedly installed on the top face of the base table, the protection main bodies can slide and turn over along the guide rods, the insertion plates are connected with the protection main bodies in an inserted mode, and the two protection main bodies which are symmetrically arranged jointly shield the protection test table and form a protection barrier around the test table; the protection main body and the insertion plate can limit fragment splashing and improve the protection effect and safety, the protection main body with the inclined bottom can collect crushed stones and facilitate later concentrated cleaning, when fragments need to be poured out in a concentrated mode, the protection main body can be pushed to move and turn over along the guide rod, and then the concrete fragments collected in the protection main body are poured out; the purpose of facilitating discharging is achieved.

The invention discloses a preparation process of a high-temperature-resistant metal protective coating, and relates to the technical field of protective coatings. According to the coating, an inorganic material which is stable at high temperature is compounded with an organic polymer to form a matrix with excellent high-temperature resistance, and an anti-corrosion filler is added to improve the corrosion resistance and the wear resistance. Through a specific preparation process, the coating and the metal substrate are tightly combined to form a compact protective barrier. The coating provided by the invention has excellent high-temperature resistance, corrosion resistance and adhesive force, and is suitable for metal structure protection in a high-temperature environment.

The invention discloses an underground engineering leakage treatment device, which comprises a magnetic leakage stopping slurry containing superfine cement, magnetic powder, an early strength agent, a flocculating agent, a water reducing agent, a water-borne epoxy resin emulsion, an epoxy curing agent and water; the thick iron plate is fixed at the rock wall crack through an expansion fixing bolt, and a grouting space is reserved between the thick iron plate and the permanent magnet; the permanent magnet is wrapped and adsorbed on the thick iron plate through a stainless steel wrapping plate; the grouting pump, the grouting pipe and the expansion fixing bolt are used for fixing the thick iron plate and conveying grout; a handheld drilling and grouting integrated grouting machine comprises a drilling and grouting integrated grouting head, a grout circulation cavity and a circular column permanent magnet, and the grouting head is embedded into a threaded blade and can push the circular column permanent magnet into the deep part of a crack through a boosting rod. When the slope slides, the magnetic base and the iron ore waste residues can quickly respond to form a wall, and the wall becomes a protective barrier.

The invention relates to a novel oil seal for a bearing unit, which comprises an external sealing element and an internal sealing element which can rotate relatively, the external sealing element is hermetically connected with the inner wall of a bearing outer ring, and the internal sealing element is hermetically connected with a bearing inner ring; a first protective barrier is formed through the first bend arranged on the first metal framework, so that external silt is not prone to directly impacting the second sealing lip. And then through three-stage sealing of the second sealing lip, the third sealing lip and the fourth sealing lip, water vapor is prevented from entering. Three contact lips are arranged on the first sealing lip, and three-level sealing is achieved. The bearing further has the sealing effect that an integrated structure is formed by sealing of the annular protrusion and the bearing inner ring, sealing of the first sealing layer and the bearing outer ring and sealing of the second sealing layer, and a third sealing layer at the end of the supporting ring enables the first rubber layer to be connected with the supporting ring more firmly. The whole oil seal is provided with 11 sealing structures, rubber sealing is arranged on the outer periphery, the inner periphery and the end face, and water vapor can be prevented from entering the oil seal.

The invention relates to a protective barrier for catching a moving object, comprising a net and a supporting structure (6); wherein the supporting structure (6) stretches out and fastens the net (2); and wherein the net (2) has at least a first cable (90) and a second cable (91) with a respective thickness, wherein the net (2) is connected by the first cable (90) and the second cable (91), and the net (2) has at least one connection point (7), wherein the connection point (7) has a thickness, and the thickness of the connection point (7) corresponds at most to twice the thickness of the first cable (90) or to twice the thickness of the second cable (91), wherein the first cable (90) and the second cable (91) contain polyethylene, and the stretched-out net has an energy weight class of 500 kJ / (kg / m2) or more.

This invention discloses a lightweight, flame-retardant, medium-voltage aluminum alloy cable for new energy charging stations, relating to the field of aluminum alloy cable technology. It includes a cable core and an aluminum alloy armor layer and an outer sheath layer sequentially wrapped around the cable core from the inside out. The aluminum alloy armor layer consists of an inner armor layer and several outer armor layers fitted onto the inner armor layer. The two ends of the outer armor layers are slidably connected to the inner armor layers, and a thermal expansion agent is filled between adjacent outer armor layers. The inner surface of the outer armor layer has several annularly distributed guide rods, and the inner armor layer has several grooves corresponding to and slidably sealed to the guide rods. Component B is encapsulated in the grooves, and component A is encapsulated in the guide rods. The lower end of the guide rods has a valve that allows component B to enter component A to react and release the flame-retardant material. This invention improves the flame-retardant performance of the aluminum alloy cable by creating a chemical-physical protective barrier through the interlocking of the thermal expansion agent and the outer armor layer.

This utility model discloses a probe protection device, specifically relating to the field of probe protection technology. It includes a telescopic mechanism, with support components symmetrically and fixedly connected to the upper part of the telescopic mechanism away from its axis. A turntable is rotatably connected to the upper end of the support components, and a second turntable is rotatably connected to the inner cavity of the first turntable. A protective mechanism is fixedly connected to the lower end of the telescopic mechanism, and a probe head is fixedly connected to the inner cavity of the protective mechanism. This utility model, through its protective mechanism, provides an additional protective barrier when the probe is in operation, effectively resisting and buffering impacts from splashed molten slag, falling materials, or other mechanical parts from inside the furnace. It provides a solid barrier when the probe is not in use, and simultaneously, the protective structure provides a safe storage environment, preventing damage to the probe due to accidental collisions, drops, or other reasons.

The utility model relates to the technical field of assembly type buildings, and discloses a fast assembly type assembly handrail for buildings, which comprises a bottom plate, an installation mechanism is arranged at the top of the bottom plate, a protection mechanism is arranged on the surface of the installation mechanism, the installation mechanism comprises a fixing plate, the fixing plate is arranged at the top of the bottom plate, and the protection mechanism is arranged on the surface of the fixing plate. And limiting grooves are formed in the two sides of the fixing plate correspondingly, stand columns are inserted into the limiting grooves and fixedly connected to the top of the bottom plate, and transverse plates are fixedly connected to the bottoms of the stand columns. Compared with a traditional integrated handrail, the rapid assembly type assembled handrail for the buildings has the advantages of being small in occupied space and convenient to carry through the arranged installation mechanism, common lateral impact force in the building construction process can be effectively resisted through the arranged protection mechanism, and the assembly type assembled handrail for the buildings has the advantages of being convenient to carry and high in practicability. And a reliable safety protection barrier is provided for field operation personnel.

The utility model discloses a feeding device for gypsum powder production, which relates to the field of feeding equipment and comprises a bucket elevator, a discharging pipe is fixedly mounted on the upper portion of the bucket elevator and sleeved with a material bundling assembly, the material bundling assembly comprises a material bundling pipeline, and dust removal assemblies are fixedly mounted on the discharging pipe and the material bundling pipeline. The dust removal assembly is composed of a dust suction fan, a dust removal pipeline, a protective blocking net and a dust filtering assembly, the dust removal pipeline is fixedly connected with the dust suction fan, and flying dust generated in the gypsum powder discharging process can be effectively collected by arranging the dust removal assembly composed of the dust suction fan, the dust removal pipeline, the protective blocking net and the dust filtering assembly; the dust concentration in a workshop is remarkably reduced, the working environment is improved, the cleaning and maintenance cost is reduced, the material loss can be reduced, the production efficiency is improved, the production cost is reduced, meanwhile, filtered clean air can be directly discharged, and the environmental protection requirement is met.

The invention relates to the technical field of micro-grids, in particular to a low-voltage micro-grid stabilization cabinet which comprises a box body, one end of the inner side wall of the box body is fixedly connected with a cabinet body, and one side wall of the box body is fixedly connected with a heat dissipation and insect repelling mechanism for dissipating heat of the cabinet body and repelling insects. According to the low-voltage micro-grid stabilization cabinet, the first motor drives the connecting rod mechanism to control the swing angle of the first cover plate and the second cover plate, the second motor drives the connecting rod mechanism to control the swing angle of the first cover plate and the second cover plate, so that the stability of the low-voltage micro-grid stabilization cabinet is improved, and the stability of the low-voltage micro-grid stabilization cabinet is improved. The opening degree of the heat dissipation opening can be adjusted in real time according to temperature data fed back by the detection mechanism, the heat dissipation efficiency is improved, meanwhile, protection performance reduction caused by full opening is avoided, and a first baffle is matched with an electric fence to form a protection barrier to kill contacted insects.

The utility model relates to the technical field of safety protection, and discloses a safety protection mechanism for construction in an ancient building, which is characterized in that the outer walls of two sides of a mounting rod on the left side of the bottom are provided with chutes, the inner walls of the chutes are connected with a bolt in a sliding manner, the outer walls of two sides of the bolt are hinged with sleeve blocks, and the inner wall of the tail end, close to the chutes, of the mounting rod is inserted with limiting blocks; the inner walls of the two ends of the limiting block are sleeved with sliding blocks correspondingly, connecting rods are arranged on the outer walls of the two sides, close to the limiting block, of the sliding groove, and the outer walls of the two connecting rods are sleeved with compressed springs. Through the arrangement of the clamping blocks and the sleeve block, the front end of the sleeve block rotates downwards to abut against the ground, then the two clamping blocks tightly clamp the two sides of the tail end of the sleeve block, and the sleeve block is firmly fixed to the current position through friction force and clamping force; in this way, the effect of stably unfolding and fixing the protective door is achieved, and a reliable protective barrier is provided for a construction area in an ancient building.

Abstract Present invention discloses an oral ulcer patch which adheres to a surface of a mouth ulcer and reduces pain associated with the mouth ulcer while at the same time accelerating healing of the mouth mucosa. The oral ulcer patch comprises an anti-inflammatory agent, an analgesic agent; a healing agent; an agent that forms a protective barrier upon reacting5 with saliva in the mouth, wherein the patch adheres to the moist ulcer area inside the mouth, forms a protective barrier, releases active analgesic and anti-inflammatory agents, and wherein the application of the patch to the ulcer reduces the pain caused by the ulcer and reduces the healing time of the ulcer. 10 Abstract Present invention discloses an oral ulcer patch which adheres to a surface of a mouth ulcer and reduces pain associated with the mouth ulcer while at the same time accelerating healing of the mouth mucosa. The oral ulcer patch comprises an anti-inflammatory agent, 5 an analgesic agent; a healing agent; an agent that forms a protective barrier upon reacting with saliva in the mouth, wherein the patch adheres to the moist ulcer area inside the mouth, forms a protective barrier, releases active analgesic and anti-inflammatory agents, and wherein the application of the patch to the ulcer reduces the pain caused by the ulcer and reduces the healing time of the ulcer. 10 20 24 28 71 87 23 D ec 2 02 4 2 0 2 4 2 8 7 1 8 7 2 3 D e c 2 0 2 4 A b s t r a c t 5 1 0