98results about How to "Quick closure" patented technology

The invention provides a modified polyglutamic acid-based tissue adhesive as well as a preparation method and application thereof. The tissue adhesive is composed of the following components: 1-30 wt% of acidic aldehyde polyglutamic acid; 1 to 15 wt% of a linear protein; 1 to 15 wt% of spherical protein; and the balance of water. The tissue adhesive provided by the invention has the advantages of self-healing performance, low underwater swelling rate and stable adhesion to wet tissues in a physiological environment, and can be applied to rapid hemostasis of dynamic wet tissue wounds in the physiological environment and sealing of wound liquid leakage. Experiments show that the tissue adhesive is high in tissue adhesion stability in a wet physiological environment, and the adhesion strength of the tissue adhesive to wet pigskin tissues can reach 37.4 kPa or above after the tissue adhesive is placed for 12 h under the physiological condition.

The invention provides a tunnel primary support process for railway engineering, and relates to the technical field of tunnel primary support. The tunnel primary support process of the railway engineering comprises the following steps: immediately carrying out danger elimination work after tunnel excavation, then carrying out primary concrete spraying operation, carrying out mortar anchor rod or hollow anchor rod construction, laying a reinforcing mesh, carrying out steel frame construction, advanced small pipe construction, anchor rod construction and advanced pipe shed construction, immediately carrying out danger elimination after tunnel excavation, and carrying out primary concrete spraying. The rock mass can be quickly closed, relaxation deformation of the rock mass is prevented, early deformation of surrounding rock is effectively controlled, stability of the surrounding rock is enhanced, safety guarantee is provided for follow-up construction, the reinforcing mesh is laid and firmly connected with the anchor rod and the steel frame, the integrity of the supporting structure is further enhanced, and the impact resistance of the supporting structure is improved. Through auxiliary construction measures such as advanced small guide pipes and advanced pipe sheds, surrounding rock is effectively reinforced, the strength and stability of the surrounding rock are improved, the construction risk is reduced, and it is ensured that tunnel construction smoothly passes through unfavorable geological sections.

The invention discloses a casting pressure testing system and device, belongs to the field of casting detection, and solves the problems that an existing casting pressure testing device cannot mark damaged parts in a casting and cannot guarantee safety in the detection process, and the casting pressure testing system comprises a testing bottom plate, a supporting column, an upper top plate, an injection molding assembly and a lifting connecting rod. The protective cover plate can quickly and stably close and shield an opening in the periphery of the equipment, the situation that a detected casting in the equipment is broken due to too large pressure, and fragment sputtering is caused is prevented, so that the safety of the equipment during operation is guaranteed, after the protective cover plate is closed, workers can be effectively prevented from making contact with the casting in the detection process, and the safety of the equipment is improved. The installation of the detection pad is matched with the liquid in the casting, so that the broken parts of the casting can be marked, once the broken parts of a plurality of castings are the same, it is indicated that equipment for casting the casting is misplaced, workers can check errors in time, and the stability and safety of the equipment during operation are guaranteed.

The production equipment comprises a base, the upper end of the base is connected with a kettle body, the base is connected with a preparation part, and the preparation part comprises a spinning device installed on the base; the processing part is arranged on the kettle body and used for assisting in processing spandex waste silk, the processing part comprises a first motor installed on the right side of the top of the kettle body, the output end of the left side of the first motor is connected with a bevel gear assembly, and the upper end in the kettle body is connected with an adjusting part. According to the production equipment and process for regenerating the spandex filaments from the spandex polymerization waste liquid, the air supply piece is matched with the cylinder body, the stirring frame, the ventilation ring, the guide pipe, the communicating groove, the ventilation block, the heat-resistant air bag, the movable ring and the safety valve, and the function of adjusting the space in the kettle body is achieved through telescopic adjustment of the heat-resistant air bag while heating and stirring in the kettle body are not affected.

The utility model discloses a large-section shallow-buried excavation tunnel construction platform device. The large-section shallow-buried excavation tunnel construction platform device comprises a support, a platform, a crawling ladder and a fence. The multiple supports are arranged at intervals in the longitudinal direction. Wherein a channel between two adjacent groups of brackets is communicated with a pilot tunnel for large-section shallow-buried excavation tunnel construction. The platform is connected to the upper portion of each support and arranged above a pilot tunnel for large-section shallow-buried excavation tunnel construction. The upper portion of the crawling ladder is connected to the platform, and the lower portion of the crawling ladder extends to the construction ground of large-section shallow-buried excavation tunnel construction. The fence is connected to the periphery of the upper portion of the support and connected to the side portion of the crawling ladder. By means of the device, synchronous footage construction of all pilot tunnels in a narrow space and vertical simultaneous construction during tunnel entering are achieved, mutual interference is avoided, it is ensured that all procedures are closely connected, section supports are rapidly closed to form a ring, the production efficiency is improved, and the phenomena that workers are lost during construction are reduced.

The utility model discloses a submerged arc furnace for ferrochrome production, which comprises a furnace body and a motor, a return pipe is arranged between the top end and the side wall of the furnace body in a penetrating manner, and a rotary filter component is arranged on the return pipe. By arranging a smoke suction pipe, a motor, a screw rod, a movable sealing cover and a second draft fan, when the feeding port is filled with materials, the feeding port can be rapidly opened or closed, smoke at the feeding port of the second draft fan is sucked when the feeding port is opened, the smoke suction pipe is matched with a filtering assembly for filtering, heat loss is greatly reduced, and meanwhile the energy consumption is reduced. The time for flue gas to blow out from the feeding hole is reduced; and by arranging the filtering assembly and the rotating shell which is rotationally arranged, the interior of the device is separated from the backflow pipe, the activated carbon plate and the filter element layer can be rapidly taken out from the placing ring to be replaced, and the processing efficiency is improved.

The invention relates to the technical field of motorcycle exhaust purification, and discloses a motorcycle secondary gulp valve which comprises a valve body protection shell, the right side of the valve body protection shell is fixedly connected with a negative pressure protection shell, and the top face of the valve body protection shell is fixedly connected with an exhaust protection shell. The left side of the valve body protection shell is fixedly connected with an air inlet protection shell, sealing connection assemblies are arranged between the valve body protection shell and the negative pressure protection shell and between the exhaust protection shell and the air inlet protection shell, an exhaust assembly is arranged on the inner side of the exhaust protection shell, and a negative pressure sealing assembly is arranged on the inner side of the negative pressure protection shell. Through the action of the communicating assembly, the valve plate can seal the communicating cavity more quickly, the reed valve is closed in time, the problem of oil accumulation in the valve body caused by reverse flow of exhaust gas of an engine is solved, liquefied gas in the valve body can be volatilized in time, and the air supply flow can be increased; the waste gas emission is improved.

The invention provides an automatic welding platform for a freezer shell, and relates to the technical field of automatic welding platforms, the automatic welding platform comprises a conveying platform, and a first welding station, a second welding station and a filling station are sequentially arranged above the conveying platform in the conveying direction; a filling assembly is arranged on the filling station; the corner butt joint piece comprises a corner plate, a middle connecting block, an outer arc block and an outer baffle; the first double-seam welding assemblies are symmetrically arranged on the two sides of the first welding station, and each first double-seam welding assembly comprises a first position adjusting component, a first laser welding gun, a first grabbing component, a first storage component and a first welding gun cleaning component; a second double-seam welding assembly; the reinforcing cover and the corner butt joint pieces are reserved outside the freezer inner container, the butt joint efficiency and the butt joint strength of the outer decoration plate can be effectively improved, the whole welding process is automatically completed, the welding efficiency is high, and manual positioning is not needed.

A catastrophe roadway remote self-adaptive closed air bag comprises an intrinsic safety type air bag storage box, a gas generation module and an expansion blocking module. The intrinsic safety type airbag storage box is used for storing the gas generation module and the expansion blocking module; the gas generation module is used for storing and releasing inert gas and located above the expansion blocking module, so that the inert gas rapidly enters the high-strength flexible airbag through the pressurization effect; the expansion blocking module is used for blocking poisonous and harmful gas generated by explosion, connected with the gas generation module and located below the gas generation module. According to the utility model, the mine multi-parameter fire hazard detector is combined with human perception, an underground fire source and a gas over-limit source are sensed in advance, identified dangerous factors are transmitted to the intrinsic safety type control motor and the alarm through electric signals, the gas generation module is triggered, and early warning of underground safety accidents is realized.

The airtight grain inlet comprises a lower grain inlet pipe, a grain inlet dustproof sleeve and an upper grain inlet pipe, the upper grain inlet pipe is located at the top of the lower grain inlet pipe, and the grain inlet dustproof sleeve can be connected to the outer portion of the upper grain inlet pipe in a sleeving mode in an up-down moving mode and used for connecting and disconnecting the upper grain inlet pipe and the lower grain inlet pipe in series. The two sides of the upper grain inlet pipe are arranged at the top of the lower grain inlet pipe in a supporting mode through support rods. Wherein the support rod on one side is rotationally connected with a sealing cover used for sealing the top of the lower grain inlet pipe through a rotating sleeve, the lower grain inlet pipe is provided with a hasp used for locking and connecting the sealing cover, and the bottom end of the lower grain inlet pipe is connected with a grain inlet of the granary. The airtight grain inlet for grain feeding of the granary top is simple in structure, convenient to install and apply and good in airtightness.

A quick-release food packaging bag comprises a main bag, a bag opening and an auxiliary bag, the bag opening is formed in the upper portion of the main bag, the bag opening and the main bag are of an integrated structure, two sets of identical lifting handles are arranged on the front face and the back face of the bag opening, and the lifting handles and the bag opening are connected and fixed through two sets of rivets. Compared with the prior art, the food bag has the advantages that by arranging the clamping strip and the clamping groove, the main bag can be quickly opened and closed through mutual embedment of the clamping strip and the clamping groove, so that the food bag is quickly opened, meanwhile, the sealing performance in the main bag is guaranteed, candies are prevented from deteriorating and being damaged, and the food bag can be conveniently taken out by arranging the bag taking window and the quick tearing opening. According to the candy packaging bag, the fast-tearing bag can be conveniently torn from the fast-tearing opening and taken out from the bag taking window, so that the purpose of convenient fast disassembly is achieved, meanwhile, candies with different tastes are contained in the fast-tearing bag, the taste diversity of the candies in the packaging bag is met, and the experience of a user is improved.

The utility model relates to the technical field of medical instruments, and discloses a sampling detection device. The sampling detection device comprises a shell, the upper end of the shell is slidably connected with a suction assembly, the lower part of the shell is rotatably connected with a rotating ring, the interior of the rotating ring is fixedly connected with a fixed bead, the exterior of the fixed bead is slidably connected with a liquid inlet pipe, and the interior of the rotating ring is slidably connected with a rotation limiting block. A square block is fixedly connected to the side end of the rotation limiting block, the side end of the rotation limiting block is elastically connected to the interior of the bottom end of the shell through a first spring, a gear assembly is fixedly connected to the bottom of the shell, and a clamping assembly is clamped to the side end of the lower portion of the shell. According to the utility model, after the rotation limiting block and the gear block are pulled out for blocking, the liquid inlet pipe cannot slide back, the rotating ring is rotated, and the rotating ring drives the fixed bead to enable the liquid inlet pipe to extend out so as to adapt to containers with different lengths, so that the practicability and the simplicity during sampling are improved.

This utility model provides a steel frame bridge with a liftable emergency device, including a steel frame bridge body (1). The feature is that: emergency devices (2) are respectively provided on the bottom of both sides of the steel frame bridge body (1), and protective components (3) are fixed on the outside of the emergency devices (2). The protective components (3) can move up and down synchronously with the emergency devices (2) relative to the steel frame bridge body (1). By providing emergency devices and protective components, the road on the steel frame bridge body can be quickly closed and passing vehicles and pedestrians can be intercepted through the synchronous up and down movement of the emergency devices and protective components. No on-site construction is required. The emergency devices and protective components are respectively raised and lowered in accordance with the rectangular holes and circular holes on the steel frame bridge body, which effectively improves adaptability.

The invention discloses electronic water pump electric control cavity verification equipment. The equipment comprises a cabinet body, an air tightness detector and a plurality of groups of air tightness tools which are uniformly arranged in the cabinet body; each group of airtight tools comprises a lower base, a lower mold and an upper mold which is horizontally arranged in the cabinet body in a lifting manner and can cover the lower mold; an air outlet hole communicated with the interior of the lower base is vertically formed in the lower base in a penetrating mode, the lower mold and the upper mold are provided with a lower mold cavity and an upper mold cavity respectively, an air injection pipe communicated with the interior of the lower mold is further fixedly arranged on the lower mold, and the air injection pipe is connected with an air outlet end connected to an air tightness detector; according to the electronic water pump electric control cavity verification equipment, the to-be-tested product can be completely sealed in the sealing die cavity of the airtight tool through the airtight tool, the detection result is prevented from being affected by external gas, the detection precision is improved, the airtight tool can also rapidly seal the product in the sealing die cavity of the airtight tool, multiple products can be detected at the same time, and the detection efficiency is improved. And the detection efficiency is improved.

The present application discloses a container, which comprises a box body, an upper top door and a lower top door, the top of the box body is provided with a top opening, the upper top door is arranged on the box body and is movable along the length direction of the box body between an open position and a closed position, the lower top door is arranged on the box body and is movable along the length direction between an open position and a closed position, the lower top door is located below the upper top door, the upper top door in the closed position and the lower top door in the closed position are arranged in succession in the length direction and cover the whole top opening, and the movement of the lower top door and the movement of the upper top door are independent of each other. According to the container of the present application, a sliding double-open top door can be designed on the top of the container, which facilitates the filling and / or removal of materials such as garbage from the top, and the design of the double-open top door can quickly and conveniently open any top door to fill and / or remove materials, and quickly and conveniently close the box body to prevent leakage during transportation and reduce pollution.

The utility model relates to the production technology field of preserved meat, concretely is the rubbing machine with prevent splashing structure, including fixed base, the upper end portion sliding installation of fixed base has rubbing box body, the inside rotation of rubbing box body is installed with stirring rod, the upper end portion sliding installation of rubbing box body has the top cover, the upper end portion sliding installation of top cover has the storage tank, the side end portion fixed mounting of rubbing box body has the fixed plate. The improved rubbing machine drives the threaded rotating lever rotation cooperation upper fixed plate limiting through the second drive motor starting, thereby drives the connecting sleeve ring to move up and down, reaches the device when using can close inside the device quickly, thereby reduces the splashing effect when rubbing, improves device use sanitary degree, and the device uses through the nozzle to export new edible salt constantly cooperation stirring rod agitating and rubbing box body shaking when, thereby makes the preserved meat rubbing in the device more fully, further improves device efficiency.

The utility model discloses an environmental protection type zip fastener bag of recycling, the inside of PCR recyclable bag surface layer is installed with PCR recyclable bag inner layer, the inner wall of PCR recyclable bag inner layer is installed with waterproof membrane closely, the bottom of the inside of PCR recyclable bag surface layer is installed with bottom reinforcing cloth that prevents shedding, the both sides of the top of bottom reinforcing cloth that prevents shedding are connected with reinforcing cloth strip equally, the top of PCR recyclable bag surface layer is sewed and is installed with fastening edge, the utility model discloses utilize waterproof membrane to the bag inside to be wrapped, has improved the waterproof performance of bag whole, prevents the rainwater and leads to its internal article damp or liquid to flow from the bag inside, simultaneously utilizes bottom reinforcing cloth that prevents shedding to the bottom of bag played the role of reinforcing and preventing shedding, prevents the bottom of bag easy breakage and shedding and leads to the internal loading article to fall, and reinforcing cloth strip and fastening edge reinforce bottom reinforcing cloth that prevents shedding, have improved its and the connectivity of bag itself, prevent its pressure and fall off.

The utility model provides a slip cover structure which comprises a shower main body and a slip cover, and an opening is arranged on the periphery of the shower main body or on one side far away from a mounting wall surface. The sliding cover is installed at the opening in a sliding mode, and concave-convex sliding assemblies are arranged on the two sides between the sliding cover and the opening. And a position keeping assembly is arranged between the sliding cover and the opening. The sliding cover moves between the opening closing position and the opening opening position through the sliding assembly, and the sliding cover is maintained at any one of the opening closing position and the opening opening position through the position maintaining assembly. According to the shower, the opening and the sliding cover are arranged on the shower, so that the opening in the shower can be opened through the sliding cover structure, convenience of quickly opening and closing the opening is provided for a user, and internal parts are quickly maintained through the opening.

The present invention relates to the technical field of pressure-sensitive adhesive preparation, specifically to a pressure-sensitive adhesive preparation device and process suitable for adhesive tapes, comprising a preparation box, a control panel fixedly connected to the left surface of the preparation box, a first reaction cylinder arranged inside the preparation box, a feed cover arranged at the top of the first reaction cylinder, a second delivery pipe arranged inside the first reaction cylinder on the right surface of the first reaction cylinder, and an electric push rod, a top plate arranged at the top of the electric push rod. The present invention can disperse the initiator sprayed through the feed pipe to the surface of the solution inside the second reaction cylinder by a counter-rotating beating ring when the lower turntable and the upper turntable rotate in opposite directions, and the second reaction cylinder is also stirred evenly, so that the internal solution fully reacts with the initiator, thereby solving the problem of uneven molecular weight in the past.

The utility model relates to the technical field of communication cabinets, in particular to a communication cabinet with a rapid heat dissipation structure, which comprises a communication cabinet body, ventilation assemblies are respectively arranged on two symmetrical outer walls of the communication cabinet body, and a fireproof assembly is arranged between the two symmetrical outer walls of the communication cabinet body. A smoke sensor is fixedly installed on the top of an inner cavity of the fireproof assembly, an alarm is fixedly installed on the top of the outer wall of the communication cabinet body, a control module is fixedly installed on the top of the outer wall of the communication cabinet body, and opening and closing doors are rotationally installed on the two sides, close to the inner cavity of the communication cabinet body, of the outer wall of the communication cabinet body correspondingly. The communication cabinet has the advantages that rainwater and dust are prevented from entering the communication cabinet body to affect circuits in the communication cabinet body in the use process of the device, and the problem that when an existing device is arranged outdoors, rainwater and moisture enter the device through heat dissipation holes, and the possibility of short circuit and damage of the circuits in the device is increased is solved. And potential safety hazards of the device are increased.

The utility model relates to the technical field of household paper processing, and discloses an automatic rolling device for household paper processing, which comprises a working table, four supporting legs are fixedly arranged on the bottom surface of the working table and are uniformly distributed on the peripheral bottom surface of the working table, an unwinding mechanism is fixedly arranged on the top surface of the working table, and a rolling mechanism is fixedly arranged on the bottom surface of the working table. A pasting mechanism is fixedly arranged in the workbench; the unwinding mechanism comprises an unwinding part and a fixing part, and the side face of the unwinding part is fixedly connected with the side face of the fixing part. The unwinding part comprises a fixing plate, and the top face of the right end of the workbench is fixedly connected with the bottom face of the fixing plate. And through the arrangement of the pasting mechanism, and through the cooperative work of a motor B and a bidirectional threaded rod, a connecting plate A and a connecting plate B can be correspondingly folded and moved, so that a supporting rod is driven to move rightwards, when paper is attached to the upper portion of a containing cylinder, the paper can be rapidly fixed through a pasting block, and therefore the paper can be conveniently rolled.

The utility model relates to the technical field of dissolving equipment, and discloses a traditional Chinese medicine solid reagent rapid dissolving device which comprises supporting legs, the outer walls of the supporting legs are fixedly connected with a first motor, the output end of the first motor is fixedly connected with a first gear, and the outer wall of the first gear is in meshed connection with a second gear. A driving ring is fixedly connected to the inner wall of the second gear, a discharging baffle is rotatably connected to the outer wall of the second rotating shaft, a third rotating shaft is rotatably connected to the inner wall of the discharging baffle, a limiting ring is fixedly connected to the outer wall of the third rotating shaft, and the outer wall of the limiting ring is fixedly connected to the inner wall of the discharging pipe; a tank body is fixedly connected to the upper surface of the discharging pipe, and a supporting assembly is arranged on the outer wall of the tank body. According to the discharging device, the first motor drives the first gear to drive the second gear to drive the driving ring and the first rotating shaft to pull the second rotating shaft to drive the discharging baffle to be opened and closed under limiting of the third rotating shaft, and the effects of rapid discharging and closing can be achieved.

The utility model belongs to the technical field of furnace door sealing device, and disclose an automatic sealing device of furnace door of industrial furnace, including furnace body, the upper surface rotationally connected with furnace door of furnace body, the lower surface fixedly connected with sealing door of furnace door, the upper surface fixedly connected with mounting seat of furnace door, the upper surface fixedly connected with air pump of mounting seat, the output fixedly connected with conveying pipe of air pump, the one end fixedly connected with air bag of conveying pipe away from air pump, the lower surface fixedly connected with motor of mounting plate, the output fixedly connected with rotating shaft of motor, the lower surface fixedly connected with rotating rod of rotating shaft, the one end fixedly connected with pressing plate of rotating rod away from rotating shaft, cooperate through sealing door, mounting seat, air pump, conveying pipe and air bag, realize sealing effect through air pump air bag, can be filled with air and discharged rapidly, realize the process of quick automation's closing and opening, air bag can realize even coating furnace door edge after inflating, form the close seal, guarantee the sealing property of high temperature environment in the furnace.

The metal storage tank convenient to move comprises a storage tank body and a discharging pipe, the discharging pipe is welded to the outer wall of the top of the storage tank body, the outer wall of the bottom of the storage tank body is connected with a discharging valve through a flange, and the outer wall of the top of the storage tank body is rotationally connected with a rotating ring. By arranging a moving ring, a matching rod, a locking plate and an L-shaped plate, during use, a rotating ring is directly rotated to enable the moving ring to move downwards, then the L-shaped plate can be matched with the matching rod to pull the locking plate, rapid closing is achieved, and the L-shaped plate can be directly arranged at the top of the supporting table when needing to be moved. The device can be quickly closed, meanwhile, the clamping assembly is arranged and comprises the inner column, the clamping plate, the limiting block and the pull rod, the rotating handle is directly inserted into the rotating ring, the inner column is pushed to enable the clamping plate to be clamped in the rotating ring, meanwhile, the limiting block limits the clamping plate, then the rotating handle can be disassembled and assembled, and use is convenient.

The utility model relates to the technical field of PVC (polyvinyl chloride) hand bags, in particular to a PVC hand bag convenient to seal, which comprises a PVC paper bag body, a rubber pad and a sealing component, a storage groove is arranged above the side wall of the PVC paper bag body, and the sealing component is mounted between the storage groove and the PVC paper bag body in a matching manner. The two symmetrical sides of the PVC paper bag body are each provided with a hand lifting assembly. According to the PVC hand bag convenient to seal, the sealing assembly is arranged in the PVC hand bag convenient to seal, and all structures in the sealing assembly are matched with one another, so that the advantage that the opening of the PVC paper bag body can be quickly sealed in the using process of the device is achieved, and the problem that an existing device cannot be well sealed in the using process and cannot be used for sealing the PVC paper bag body is solved. The problems that dust and foreign matter easily enter the device from the opening in the using process of the device, internal objects leak or are polluted by the outside, and the packaged objects cannot be kept clean and complete are solved.

This utility model provides an intermittent aeration MBR reactor, relating to the technical field of aeration devices. The intermittent aeration MBR reactor includes an aeration tank containing a horizontal pipe. Multiple aeration pipes are connected to the upper end of the horizontal pipe. Each aeration pipe contains a self-sealing assembly. The self-sealing assembly includes a fixing ring fixedly connected to the inner wall of the aeration pipe. A sealing block is slidably connected within the fixing ring. A circular block is fixedly connected to the upper end of the sealing block. The circular block is elastically connected to the adjacent side of the fixing ring via multiple springs. Multiple vertical rods are fixedly connected to the lower end of the circular block, and all vertical rods penetrate the fixing ring. The intermittent aeration MBR reactor provided by this utility model has the advantages of compact structure, strong self-cleaning ability, and flexible adjustment.

The invention discloses a self-healing and self-adhesion type metal protective film based on a multi-scale micro-nano fiber network and a preparation method of the self-healing and self-adhesion type metal protective film. The self-adhesive protective film is a self-adhesive film material which is prepared from a self-healing polyvinylidene fluoride film containing a multi-scale micro-nano fiber network, a self-adhesive glue layer and a release film layer through melt-blowing, rolling and compounding and has self-healing and long-term protection performance. A multi-scale core-shell fiber network containing a micro-foaming polyurethane core material prepared by using a coaxial electrostatic spinning technology is used as a self-healing material, so that the filling enhancement of a membrane material is realized, the healing response to cracks of different scales can be generated, the healing effect is excellent, and the cost is low as the use amount of the core material for single-time healing is small. The self-adhesive film can repeatedly realize the self-healing process of multiple times of cracking. The self-adhesive film material has excellent adhesion, durability and self-healing performance, is suitable for durable repair and long-term protection of steel structures, and has important significance for related technical progress and industrial development.

The utility model discloses a simplified structure of an exhaust collection cylinder of a gas water heater. The simplified structure comprises a cylinder body and a baffle, the baffle plate is an integrated headwind baffle plate and comprises a headwind baffle plate main body and two rotating salient points; the face, facing the outside air, of the headwind baffle body is recessed inwards. The two rotating convex points are circular convex parts which are integrated with the headwind baffle main body; and when the headwind baffle main body rotates to a state of sealing the barrel, the projection of the plate body on the smaller-area side of the rotating shaft on the cross section of the barrel is an arch matched with the corresponding position of the inner cavity of the barrel, and a gap exists between the tail end of the plate body on the other larger-area side of the rotating shaft and the inner wall of the barrel. According to the utility model, only the exhaust cylinder and the upwind baffle plate are included, so that the cylinder body can be sealed more quickly when external air enters, the number of parts is small, consumables can be reduced, and the processing technology and the installation steps can be simplified.

The invention provides a liquid nitrogen-based food fresh-keeping system, which belongs to the technical field of liquid nitrogen instant freezers, and comprises a fresh-keeping mechanism, the fresh-keeping mechanism comprises a cabinet body and a tank body, the cabinet body is connected with a protective door through a rotating shaft, a locking part for sealing the cabinet body is arranged on the side wall of the cabinet body, a partition plate is arranged in the cabinet body, and a fan and an air outlet are arranged on the partition plate; a fresh-keeping part for guiding atomized liquid nitrogen to flow is arranged on the partition plate, and a supporting part is arranged in the cabinet body; the adjusting mechanism comprises a penetrating opening formed in the safety part, a sealing part is arranged in the penetrating opening, a storage part and a limiting part are arranged on the supporting part, and an adjusting part is arranged on the limiting part; the auxiliary mechanism comprises a first fixing sleeve and a second fixing sleeve which are arranged in the cabinet body, a pushing part is arranged on the first fixing sleeve, a lifting part is arranged on the second fixing sleeve, and a guiding part is arranged on the lifting part. Through the arrangement of the fresh-keeping mechanism, the adjusting mechanism and the auxiliary mechanism, products in the cabinet body are quickly frozen accurately.

The invention discloses a method for removing H-shaped steel in a range of a rectangular jacking pipe starting portal, which comprises the following steps of: 1) increasing the diameter and the depth of a cement-soil mixing pile during construction of a starting well enclosure structure; (2) before the pipe jacking is started, tunnel portal water exploration is conducted; (3) the distance between the pipe jacking machine and the starting tunnel portal is adjusted, and a working face and a leaking stoppage working space are formed in the tunnel portal; (4) preparing double-liquid slurry and grouting equipment and grouting pipes thereof; 5) pulling out the H-shaped steel; (6) fixing; and (7) the pipe jacking machine starts to enter the hole. The H-shaped steel is removed through a pulling-out method, time can be saved, efficiency can be improved, and it is guaranteed that the pipe jacking machine can be started rapidly. And meanwhile, the whole section steel can be completely recycled without leaving, so that materials can be saved. In addition, the stability of soil on the tunnel face of the tunnel portal is not damaged when the profile steel is pulled out, and construction safety can be guaranteed. In addition, double-liquid slurry is injected into the gap after the profile steel is pulled out, underground water can be rapidly sealed, sudden gushing of the foundation pit is prevented, and construction safety is guaranteed.