86results about How to "Realize self-sealing" patented technology

Disclosed is a vacuum fresh box which comprises a box body, a cover body, a drawing device used for the vacuumizing the box body and a releasing device used for canceling the vacuum state of the box body; the drawing deice includes a joint, an air extraction valve connected with the joint and a fixing device used for fixing the air extraction valve; the releasing device includes an air inflation valve and a support device used for maintaining the air inflation valve in the closing position; the drawing device utilizes the air pressure inside and outside the box body to realize the automatic seal of the box body; the releasing device can cancel the vacuum state according to the operation of the operators.

A lumber drying kiln comprises a kiln body which is provided with a main kiln door. The kiln body is internally provided with at least one set of air feeding device and heating device. A plurality of exhausting devices are arranged in the kiln body. A temperature and humidity detecting device and a moisture content detecting device are arranged in the kiln body. According to the lumber drying kiln, the temperature in the kiln is even by means of the air feeding and heating mode, a steam spraying pipe is matched, the temperature and humidity in the kiln are easy to adjust and control, the energy utilization rate is high, and the energy conservation effect is good; an air speed field, a temperature field and a humidity field are uniform in distribution, and the drying uniformity is good; the drying efficiency is high, and the comprehensive technological economic performance is good. After the lumber drying kiln is adopted, the drying cycle is shortened by 33%, color changing, decaying and worm damage are zero, internal cracking is zero, end cracking and surface cracking is 0.6%, deformation is also greatly relieved, and the internal stress is fully eliminated.

The invention relates to the technical field of rail transit of vacuum pipelines, in particular to a partition device of a vacuum pipeline. The partition device comprises a shell, the shell is transversely arranged between two adjacent pipeline beams, the shell is respectively in sealed connection with two adjacent pipeline beams, openings matched with the inner diameters of the two adjacent pipeline beams are formed in the two side surfaces of the shell respectively, a track beam connecting section and a gate are arranged in the shell, the track beam connecting section and the gate are respectively and slidably connected into the shell, the width of the track beam connecting section and the gate are matched with the width of the shell, the size of the gate is larger than that of the opening. According to the partition device, by the adoption of the device, automatic sealing of the gate can be realized by utilizing the air pressure difference, pressing force does not need to be applied, the pipeline beam can be segmented in a segmented mode, the independent region can be conveniently restored to normal pressure, the recovery speed is improved, the time and the cost are reduced, therescue evacuation efficiency is improved, the normal operation of the train cannot be influenced at ordinary times, the structure is practical, and the installation is convenient.

The invention relates to a nucleic acid detection device based on a microfluidic chip. The device comprises a chip chamber for accommodating a chip, a motor, two sample adding pumps, a radiator and acontroller, wherein the chip chamber comprises a chip chamber upper cover, a chip chamber middle ring and a chip chamber lower ring which are connected from top to bottom sequentially; the motor and the sample adding pumps are arranged on one side of the chip chamber, the sample adding pumps are driven by the motor to act to add a nucleic acid sample to the reaction chip; the radiator is arrangedon one side of the chip chamber and used for cooling the reaction chamber to control the temperature of the reaction chamber within a preset range; the controller completes a reaction test by controlling the rotation speed and temperature of the reaction chip as well as the motor; the chip comprises a chip upper layer, a chip lower layer and a chip middle layer which are arranged sequentially, andan FTA (filter paper) card is arranged in the chip middle layer. The device has high degree of automation, an operator can realize nucleic acid detection only by single sample addition, and control precision is high.

The invention discloses a novel self-service nursing bed for postoperative patients. The novel self-service nursing bed comprises a bed body, a urinal and a driving mechanism, wherein a sliding plate is arranged at the upper side of the bed body, the bottom of the sliding plate is installed on a track of the surface of a bed board in a matched mode through pulleys, a backing plate is hinged to the rear end of the sliding plate through a pin shaft, a driving rod is arranged at the position, located at the hinge portion, of the backing plate, and the driving rod is hinged to the driving end of a main driving mechanism fixed at the bottom of the bed body; a through hole is formed in the middle of the bed body, and a urine leaking hole is formed in the sliding plate; the urinal is connected to the bottom of the sliding plate, and an upper opening of the urinal is located under the leaking hole. After the sliding plate moves backwards, the urine leaking hole located in the sliding plate can correspond to the through hole in the bed board. When the main driving mechanism is controlled to recover the sliding plate and the backing plate in the flat-on state, the urine leaking hole, the through hole and the upper opening of the urinal do not correspond any more, and the upper opening of the urinal can be sealed.

The invention relates to a self-sealing socket butt-joint corrugated pipe and a manufacture method, which can enable corrugated pipes to be free of welding connection, meet high butt-joint requirements for reliable sealing, and enable socket between the corrugated pipes after butt joint to have a self-sealing function. The self-sealing socket butt-joint corrugated pipe comprises a corrugated pipe, a corrugated pipe bell end and a corrugated pipe inserting opening, wherein the bell end in the corrugated pipe is in butt joint with one end of a pipe opening of the corrugated pipe, and a cladding belt made of materials same as the corrugated pipe is utilized to clad the bell end and the one end of the pipe opening of the corrugated pipe into an integral structure in a fusing mode. The inserting opening in the corrugated pipe is in butt joint with the other end of the pipe opening of the corrugated pipe, and a cladding belt made of materials same as the corrugated pipe is utilized to clad the bell end and the other end of the pipe opening of the corrugated pipe into an integral structure in a fusing mode. An annular groove is arranged on the excircle surface of the inserting opening. The self-sealing socket butt-joint corrugated pipe and the manufacture method have the advantage that a leading card that the corrugated pipe bell end, the corrugated pipe inserting opening and the corrugated pipe port require no welding connection, are directly in butt joint and are formed in a fusing cladding mode is given.

The invention discloses a full-automatic testing tool for a turbocharger. The tool comprises a bottom plate, a volute sealing part and a pressure shell sealing part, the volute sealing part comprisesa first volute sealing mechanism and a second volute sealing mechanism; the volute second sealing mechanism is connected with the bottom plate, the pressure shell sealing part is arranged above the volute sealing part, the pressure shell sealing part comprises a pressure shell first sealing mechanism and a pressure shell second sealing mechanism, the pressure shell second sealing mechanism is connected with the first leakage instrument channel, and the volute second sealing mechanism is connected with the second leakage instrument channel. After the structure is adopted, the volute is positioned and sealed by the volute sealing part, and the gas leakage amount of the volute end can be obtained by detecting the second leakage instrument channel connected with the second volute sealing mechanism; the pressure shell sealing part positions and clamps the pressure shell and seals the pressure shell, the gas leakage amount of the pressure end can be measured by detecting the first leakage instrument channel connected with the second sealing mechanism of the pressure shell, and the turbocharger leakage test is completed.

The invention discloses a self-enclosed packer which is applied to sealing of a ring-shaped gap between a pile and a sleeve in a marine drilling platform, and arranged between the sleeve and the pile, The self-enclosed packer is characterized by comprises a rubber sleeve; the rubber sleeve is coaxial with the sleeve and arranged at the inner bottom of the sleeve; the bottom of the rubber sleeve is in sealed connection with the sleeve through a bottom fixing device; a cement mortar accommodating cavity is formed in a gap between the rubber sleeve and the sleeve; the top of the rubber case is connected with the sleeve through a top fixing device; mortar grouting openings are formed in the top of the rubber case. Only the rubber case and the corresponding fixing devices are subjected to automatic sealing, so that the self-enclosed packer is simple in structure, easy to manufacture and low in cost; besides, the self-enclosed packer has the advantages of being high in safe factor like an active packer, simple to mount like a passive packer, free of pipelines and power systems, and the like.

The invention relates to a high-pressure jet-flow nozzle and a high-pressure jet-flow crushing device using the same. An elastic component is arranged between a jet-flow channel component and a sealing cover of the high-pressure jet-flow nozzle, and the jet-flow channel component is fixed to a shell. In addition, a buffering cavity is formed by a space used for accommodating the elastic component.Assembling of the high-pressure jet-flow nozzle can be simplified, and damage to the jet-flow channel component is avoided in the assembling process; sealing between the jet-flow channel component and the shell can be automatically achieved by means of the pressure generated by a high-pressure pump; the capacity can be conveniently improved; pressure fluctuation can be reduced through the buffering cavity, so that the crushing effect is improved, and particle size distribution of materials is decreased; and meanwhile, the impact of pressure fluctuation on the jet-flow channel component is reduced, and the damage risk of the jet-flow channel component is lowered.

The invention provides a total-pressure high-speed exhaust valve, which comprises a cylinder, a main valve cavity, an air guide and exhaust barrel, a sealing floating body, a piston spring and a main valve piston. The main valve cavity is arranged on the lower part of the cylinder; the air guide and exhaust barrel is arranged in the main valve cavity; the sealing floating body is arranged in the air guide and exhaust barrel; the main valve piston is provided with a vertical through hole; the main valve piston comprises a piston column, a cylinder piston and a sealing baffle plate, the cylinder piston and the sealing baffle plate are respectively arranged at the upper end and the lower end of the piston column, an air exhaust and supplement opening is formed in the side wall of the lower part of the cylinder, and a main valve port is formed in the cavity wall of the main valve cavity; the piston spring is sleeved on the piston column and is positioned between the cylinder piston and the upper cavity wall of the main valve cavity; and the upper end of the sealing floating body corresponds to a lower port of the vertical through hole of the main valve piston. The total-pressure high-speed exhaust valve has the advantages that the design is scientific, and the valve can be automatically sealed without the aid of a floating ball or a lever when the inside of a pipe has water.

The invention discloses a neodymium-iron-boron rotary hydrogen decrepitation furnace utilizing thermal expansion and cold contraction for pressurizing and sealing. The neodymium-iron-boron rotary hydrogen decrepitation furnace structurally comprises a supporting bottom plate, a temperature reducer, two retainers, a controller, a rotating rod, a discharging pipe, a hydrogen decrepitation furnace body and a feeding pipe. The two retainers are mounted on the two sides of the supporting bottom plate, and the lower end of the temperature reducer is attached to the upper end of the supporting bottomplate. The right side of the controller and the left sides of the upper ends of the retainers are welded, and the right side of the rotating rod penetrates through the middle section of the lower endof the left side of the hydrogen decrepitation furnace body. Through the neodymium-iron-boron rotary hydrogen decrepitation furnace, the problems that a feeding pipe of a traditional hydrogen decrepitation furnace in the market often guides external air into the furnace during hydrogen decrepitation, especially in a machining workshop, the machining workshop is equipped with a large number of large cooling fans, the air is guided into the hydrogen decrepitation furnace through the feeding pipe more easily in the high-speed rotating process of the fans, consequently, the magnetic property of powder is weakened significantly, and neodymium-iron-boron fine powder is even likely to be naturally oxidized by the air to catch fire are solved.

The invention discloses a garden greening brick, which comprises a base, wherein a spherical concave cavity is formed in the upper end surface of the base; a support sphere body is arranged in the spherical concave cavity; the bottom part of the support sphere body is charged into the spherical concave cavity; a circle of position limiting baffle ring is coated outside the support sphere body; thetop of the support sphere body is provided with an inflation sphere; an inflation cavity is formed in the inflation sphere; air is fully filled in the inflation cavity; the inflation sphere passes through the base plate and extends out of the upper end surface of the base plate; a circle of clamp groove is formed in the outer wall of the base plate; an inflation ring is arranged in the clamp groove in an embedded way; an inflation passage is formed in the middle of the inflation ring. The greening brick provided by the invention has an automatic resetting function; after the pedaling, the gapbetween the adjacent brick bodies can be effectively sealed; the sputtering condition in rainy days can be prevented; the interestingness can be enhanced; the garden greening brick can be used for blind people.

The invention discloses a dry powder material powder leakage preventing bulk machine head device. The dry powder material powder leakage preventing bulk machine head device comprises a soft connectionpart, a movable assembly and a non-movable assembly. The movable assembly comprises a material guiding barrel and a material guiding barrel base ring. The outer side of the material guiding barrel isconnected with the material guiding barrel base ring. The material guiding barrel base ring is connected with a lower inverted-cone-shaped sealing cover through two or more vertical bolt assemblies,and the big end of the inverted-cone-shaped sealing cover is arranged downwards. The non-movable assembly comprises a material guiding barrel limiting ring and a material receiving cone barrel. The material guiding barrel and the bolt assemblies in the movable assembly penetrate an outlet in the bottom of the material receiving cone barrel and the material guiding barrel limiting ring and move upand down. After unloading is finished in the structure, the inverted-cone-shaped sealing cover ascends and makes contact with the outlet in the bottom of the material receiving cone barrel for closing, automatic sealing is achieved, dust pollution and powder leakage waste are prevented, and the work efficiency is improved.

The invention discloses a method for increasing extraction borehole gas extraction concentration through auxiliary boreholes, including the steps of (1), drilling a plurality of extraction boreholes side by side by a drilling rig with small-diameter drill pipe on a roadway coal seam, and broaching on the basis of the boreholes by a drilling rig with large-diameter drill pipe; (2), blocking the boreholes effectively, performing primary extraction of gas in the boreholes through gas extraction pipes, further blocking the extraction boreholes and filling the blocking sections with semi-fluid slurry when the extraction concentration of gas is lower than 50%; (3), drilling a plurality of auxiliary boreholes around the side-by-side extraction boreholes by the drilling rig with small-diameter drill pipe when the concentration of gas is lower than 30%, and pouring to block the auxiliary boreholes. The method has the advantages of increasing borehole extraction utilization rate and gas extraction concentration, shortening effective extraction cycle and relieving tension in succession of exploitation, and is easy to operate and low in cost.

The invention relates to pressure cooker, in particular to an electric pressure cooker. The electric pressure cooker is capable of automatically sealing, preventing overflow during boiling and automatically venting. The electric pressure cooker comprises a pot, a pot cover, a pot sleeve and an electric heating program panel and is characterized in that a first lever and a second lever are sequentially mounted on the pot cover, the left end of the first lever is mounted below an upper pressure valve of the pot cover, and the left end of the second lever is located above the right end of the first lever; a third lever and an electromagnetic valve are mounted at the bottom of the pot sleeve, and the electromagnetic valve is mounted near the left end of the third lever; a transmission lever is mounted on the side in the pot sleeve, the upper end of the transmission rod is located below the right end of the second lever, the lower end of the transmission rod is located above the right end of the third lever, a timer is added to the electric heating program panel, and the electromagnetic valve is connected with the timer. A microcomputer controls the electromagnetic valve to trigger a venting mechanism for venting, venting time and frequency can be set, and boiling and non-boiling control of various cooking functions can be achieved.

The invention discloses a self-enclosed packer which is applied to sealing of a ring-shaped gap between a pile and a sleeve in a marine drilling platform, and arranged between the sleeve and the pile, The self-enclosed packer is characterized by comprises a rubber sleeve; the rubber sleeve is coaxial with the sleeve and arranged at the inner bottom of the sleeve; the bottom of the rubber sleeve is in sealed connection with the sleeve through a bottom fixing device; a cement mortar accommodating cavity is formed in a gap between the rubber sleeve and the sleeve; the top of the rubber case is connected with the sleeve through a top fixing device; mortar grouting openings are formed in the top of the rubber case. Only the rubber case and the corresponding fixing devices are subjected to automatic sealing, so that the self-enclosed packer is simple in structure, easy to manufacture and low in cost; besides, the self-enclosed packer has the advantages of being high in safe factor like an active packer, simple to mount like a passive packer, free of pipelines and power systems, and the like.

The invention provides an automatic film covering type aerobic fermentation device. The automatic film covering type aerobic fermentation device comprises a fermentation box, an aeration ventilation system, an automatic film covering system, an automatic film pressing device and a detection control system, wherein openings are formed in the top and one side of the fermentation box, and aeration pipelines are arranged at the bottom of the fermentation box; the automatic film covering system is composed of a reciprocating device, a film rolling / covering device, a guiding device, a detecting device and a film, and as the reciprocating device reciprocates on a steel rail, the film rolling / covering device automatically completes a top film rolling / covering process; the automatic film pressing device realizes automatic sealing of the film through a bracket, a speed reducing motor, a chain wheel, a chain, a transmission shaft, a steel wire rope wheel, a steel wire rope, a counterweight and aninductive switch; and the detection control system comprises an electric control cabinet, an oxygen sensor, a temperature and humidity sensor and a limit switch, the oxygen sensor and the temperatureand humidity sensor monitor a real-time state in the fermentation box, and the limit switch controls the start-stop position of reciprocating motion and the vertical position of automatic film pressing. The automatic film covering type aerobic fermentation device in the invention has the advantages of simplicity in operation, labor saving, high automation degree, wide application range, low investment and operation cost and the like.

The invention discloses a bio-organic fertilizer fermentation device, comprising scrapers and liquid collecting plates, a stirring roller is arranged on the left side of each scraper, and a fermentation bin is arranged on the right sides of the scrapers; the left sides of the stirring rollers are connected with a rotating roller, and a motor is connected to the upper side of the rotating roller; apulling plate is arranged below the scrapers, and a shaping bin is arranged below the pulling plate; a shaping plate is arranged in the shaping bin, a pressing plate is mounted on the right side of the shaping plate, a hydraulic rod is connected to the right side of the pressing plate, and a hydraulic pump is disposed on the right side of the hydraulic rod; and a partition plate is installed above the scrapers, the right side of the partition plate is provided with a feeding port, and the interior of vent holes are provided with activated carbon filter screens. The bio-organic fertilizer fermentation device has strong stirring effect, can purify pollution gas generated during a fermentation process, reduces environmental pollution, and can shape organic matter after the fermentation is finished, thereby reducing the later operation process.

The invention belongs to the field of preparation of absorption expansion resin, and particularly relates to a preparation method and application of pH-sensitive water-absorption expansion resin. Thepreparation method of the pH-sensitive water-absorption expansion resin comprises the following steps: carrying out copolymerization reaction on acrylamide, acrylic acid, methacryloyloxyethyl trimethyl ammonium salt and a cross-linking agent N,N-methylene bisacrylamide in a solvent under the condition that the pH value is 5-7, wherein the molar ratio of acrylamide to methacryloyloxyethyl trimethylammonium salt is (1-2):(1-2), the mass of acrylic acid accounts for 18-22% of the mass of acrylamide, and the mass of the cross-linking agent accounts for 1-6% of the total mass of acrylamide, acrylic acid and methacryloyloxyethyl trimethyl ammonium salt monomers. According to the preparation method of the pH-sensitive water-absorption expansion resin, the comonomer and the cross-linking agent are selected, so that the resin has pH sensitivity and relatively strong water retention capacity, and can tolerate a complex formation pressure environment.

The invention provides tank-body-structure-variable D-type pulping equipment based on multi-class turbulence. The equipment mainly comprises a slurry generating device, a power driving device, a spiral turbulence device, a multi-class turbulence device, a combined partition plate device, a partition plate angle adjusting device and a partition plate position adjusting device, wherein the combinedpartition plate device is mainly composed of a baffle A, a baffle B, a baffle C and a baffle D; the partition plate angle adjusting device comprises a support, a movable rod and a sleeve B; the partition plate position adjusting device is composed of a screw rod and a sleeve A. By means of the spiral turbulence device, turbulence stirring, crushing and decomposition of crushed aggregates are achieved; the multi-class turbulence device is used for auxiliary turbulence stirring, crushing and decomposition of the crushed aggregates; through the combined partition plate device, an O-type crushed aggregate tank body is changed into a D-type tank body, and automatic sealing of the D-type tank body is achieved; the angle of the combined partition plate device is adjusted through the partition plate angle adjusting device; the radial position of the combined partition plate device in a material cylinder is adjusted through the partition plate position adjusting device.

The invention relates to an internal pressure blasting testing apparatus for a cladding pipe. The internal pressure blasting testing apparatus comprises a vacuum heating device, a cladding pipe arranged inside the vacuum heating device, a protective component arranged inside the vacuum heating device and sleeving the periphery of the cladding pipe, a pressure medium conveying pipeline arranged atone end of the protective component and communicated with the cladding pipe so as to convey a pressure medium to the cladding pipe, and a pressure medium releasing device arranged at the other end ofthe protective component and communicated with the protective component, wherein the pressure medium releasing device extends out from the vacuum heating device, so that the medium inside the protective component is conveyed to the outside of the vacuum heating device. According to the internal pressure blasting testing apparatus for the cladding pipe disclosed by the invention, the pressure medium can be conveyed to the outside of the vacuum heating device, the medium after blasting is prevented from damaging important parts inside the vacuum heating device, and recycling and reusing of the pressure medium are facilitated.

The invention discloses a magnetic suspension floor drain core. The magnetic suspension floor drain core comprises a core body and a sealing cover, wherein the upper portion of the core body is cylindrical; an opening of the upper end of the core body is a water inlet; an outlet of the lower end of the core body is a water outlet; the lower portion of the core body is a mounting seat; the lower portion of the sealing cover is a supporting rod; a first magnet is arranged in the cavity of the supporting rod; the sealing cover is inserted in the cavity of the mounting seat through a supporting rod; the bottom of the cavity of the mounting seat is sealed through a bottom cover; a second magnet is arranged in the bottom cover; the first magnet repels the second magnet; the supporting rod is driven to rise under the effect of repulsive force so as to drive the sealing cover to seal the water outlet in an abutted manner. Automatic sealing of a floor drain can be realized, deodorization and insect prevention effects can be achieved, and the magnetic suspension floor drain core is effective for a long time.

The invention provides a diaphragm type one-way valve, which is applied to the occasions for conveying materials discontinuously and uni-directionally to achieve that a passage is closed automaticallywhen the conveying of the materials is stopped. The diaphragm type one-way valve can also be applied to the occasions of floor drains and the like, and is particularly suitable to be applied to a straight-through toilet in sitting or squatting toilets and provides a novel drain valve for the straight-through toilet. Therefore, after relieving oneself, the remaining dirt is basically flushed and cleaned while one washes hands. If necessary, the remaining dirt is flushed away by jet flow water columns. The water used for flushing the toilet is quite little to achieve the advantages of water saving, emission reduction, money saving, deodorization, convenient use and low cost. The characteristics of water saving and emission reduction of the diaphragm type one-way valve are suitable for the requirements on building a resource-saving and environment-friendly society.

The invention relates to a turbo molecular pump, comprising a rotor (12) connected to a drive shaft (10). The rotor (12) has multiple rotor blades (16). The rotor (12) is surrounded by stator rings (26), wherein one stator ring (26) is provided for each rotor blade (16). In order to enable radial expansion of the rotor blade during operation, the stator rings (26) have annular grooves (32).

The invention discloses a door and window device with an automatic noise reduction function. The door and window device with the automatic noise reduction function comprises a frame and a sealing device, wherein a first window body and a second window body are arranged in the frame in a sliding fit mode; the sealing device comprises a first sealing assembly, a second sealing assembly and a third sealing assembly; sliding grooves are formed in the upper end and the lower end of the first window body and the upper end and the lower end of the second window body correspondingly; two guide rails which are arranged side by side and correspond to the sliding grooves are arranged on the frame; the guide rails comprise a movable guide rail and a fixed guide rail; displacement devices are arranged in the frame and correspond to the two sides of the movable guide rail; the two ends of the movable guide rail extend into open grooves in the two sides and are connected with the displacement devices; each displacement device is used for driving the movable guide rail to move towards the fixed guide rail; and sealing can be effectively achieved through the acting force of wind by arranging the movable guide rail, so that the sealing effect of the window in windy weather is guaranteed while the daily window gap ventilation effect is guaranteed, and the ventilation effect of daily use is guaranteed while automatic sealing is achieved.

The invention discloses an end seal main machine. The end seal main machine comprises a rack, a flush end device, a flush end feeding device, an end seal heat seal device, a horizontal movement mechanism, a horizontal movement seat body and two centering synchronization clamps. The horizontal movement seat body is arranged at the top of the rack in a sliding manner in one of the length direction and the width direction of the rack. The horizontal movement mechanism is mounted on the rack and drives the horizontal movement seat body to slide. The two centering synchronization clamps are mountedon the horizontal movement seat body in a spaced manner along the other one of the length direction and the width direction of the rack. The flush end device and the end seal heat seal device are mounted on the horizontal movement seat body and are each flush with the corresponding centering synchronization clamp in the sliding direction of the horizontal movement seat body. The flush end feedingdevice is mounted on the horizontal movement seat body and drives the flush end device to perform reciprocating sliding on the horizontal movement seat body in the sliding direction of the horizontalmovement seat body. By means of the end seal main machine, the purpose of sealing ends of steel-plastic composite pipes can be achieved so that the production efficiency can be improved.

The invention discloses a cover layer seal film for a strain gauge, and a production method and a using method thereof. The cover layer seal film comprises a strain gauge cover layer, the seal layer surface of the strain gauge cover layer is provided with an adhesive layer, and the adhesive layer is adhered with cover layer release paper, wherein the strain gauge cover layer is provided with a plurality of marking points, and positions, corresponding to strain gauge bonding pads, of the strain gauge cover layer, are hollow-out; and the cover layer seal film is used for sealing the whole straingauge. The cover layer seal film can realize the automatic sealing of the whole gauge strain, especially special-shaped pattern sealing which cannot be realized through a conventional technology, allows the alignment precision to be 3 times higher than that the manual alignment precision, improves the sealing efficiency by 5 times or more, and completely solves the problems of low efficiency, unstable quality and poor product consistence of existing artificial production.

The invention relates to the technical field of air sampling, in particular to air pollution prevention and control sampling equipment which comprises a shell and a plurality of air storage bottles, first through holes communicated with inner cavities of the air storage bottles are formed in the upper surfaces of the air storage bottles, piston blocks are slidably connected into the inner cavities, second through holes communicated with the inner cavities of the air storage bottles are formed in the bottom surfaces of the air storage bottles, and the piston blocks are slidably connected into the second through holes. A blocking hole transversely penetrating through the second through hole is formed in the side face of the lower portion of the gas storage bottle. The front side surface of the shell is provided with a mounting groove for arranging and mounting a plurality of gas storage bottles in parallel; an in-place detection sensor is arranged on the top surface, corresponding to the first through hole, of the mounting groove; an air outlet communicated with the second through hole is formed in the bottom surface, corresponding to the second through hole, of the mounting groove; an air inlet power assembly, a pipeline valve assembly, an air storage cylinder sealing assembly and a control assembly are arranged in the shell. The problems that an existing air sampler is single in air sampling direction and inconvenient to carry and use due to the fact that the extraction mode is single and cannot be adjusted and controlled are solved.