72results about How to "Easy to check for tightness" patented technology

Methods and systems are provided for detecting a fuel system leak. One or more of a boost pressure from a compressor and vacuum from an intake manifold is sequentially applied on a fuel tank. A leak is detected based on a subsequent change in fuel tank pressure.

Compositions and related methods for detecting leaks in HVAC / R components such as furnaces, portable gas heaters, swimming pool heaters, air conditioners, heat pumps, refrigerators, freezers, and other closed loop vapor compression systems, as well as heat exchangers. These compositions provide more sensitive detection of leaks in inaccessible areas of furnaces using low ODP and non-flammable compounds classified as hydrofluorochloro-ethers (HFCE's), hydrobromochlorofluoro-alkenes (HBCFA's) hydrofluoro-ethers (HFE's), and halogenated compounds which are either alkanes, alcohols, diones, acetates, ketones (e.g., butanones, pentanones), esters (e.g., propanoates), anhydrides, cycloalkanes (cycloparaffins), cycloalkenes (cycloolefins), heterocyclics (e.g., furans), and aromatics.

The invention discloses an in-ground type tap water pipeline leak detection device. The in-ground type tap water pipeline leak detection device comprises a leak measuring head which is buried inside a water leak detection area and a leak detection circuit which is connected with the leak measuring head; the leak detection head is a humidity detection measuring head; the leak measuring head comprises two leads which are arranged in a parallel mode; insulating layers cover external sides of the leads; a plurality of conductive points are distributed on the two leads; the leak detection circuit is a resistance value detection circuit which detects a resistance value between the two leads. The in-ground type tap water pipeline leak detection device has the advantages that the structure is simple, the distribution is simple and convenient, the detection effect is good, and a structure of a to-be-detected pipeline is not required to be adjusted. The invention also discloses a leak detection method. The lead detection method comprises the following steps of a first step, burying the leak measuring head and burying the leak measuring head in the water leak detection area when a to-be-detected tap water pipeline is buried; a second step, connecting the leak detection circuit; a third step, performing water leak detection. The in-ground type tap water pipeline leak detection device has the advantages that the steps are simple, the design is reasonable, the structure of the to-be-detected pipeline is not required to be changed, and the detection accuracy is high.

The invention discloses a winding spiral pipe heat exchanger, the structural style is characterized in that a tubule is winded and embedded into a groove at the outside of the spiral pipe. Wherein one or a plurality of fluid is flowed in the tubule; a fluid is flowed in the spiral pipe; the winding spiral pipe can realize multi-flow heat exchange with the spiral pipe. The groove structure can enlarge heat exchange area and improve the efficiency of heat transfer. In addition, the multi-flow of the tubule can make the fluid in the spiral pipe implement heat exchange with one or a plurality of fluid, so the flexibility and heat exchange efficiency of the heat exchanger can be improved greatly. Compared with the micro-channel heat exchanger, the winding spiral pipe heat exchanger has the advantages that: the structure is simple; the processing is convenient; the metal consumption is less compared with the extension-type heat exchanger; the manufacturing cost is low; the heat exchange coefficient of the fluid is over 2 times than that of the extension-type heat exchanger; if the fluid of the tubule or the fluid of the spiral pipe is leaked, a cross-contamination will not be happened; thereby the winding spiral pipe heat exchanger is most suitable for transcritical CO2 heat pump water heater and other systems.

A leak detection apparatus for aircraft bleed air systems includes a supporting spacer positioned within the shroud and supported upon the bleed air duct of the aircraft. A sleeve supported on the exterior of the shroud further supports a plenum having generally cylindrical sensor tubes through which sensor wire sets pass. A director positioned within the shroud above the bleed air duct is coupled to a generally cylindrical accumulator which in turn is in communication with the plenum. Appropriate apertures are provided to vent and direct bleed air from the shroud interior to the sensor wire sets and thereafter vent outwardly into cooler ambient air. The sensor wire sets respond to the temperature of the bleed air leakage to trigger alarm apparatus.

The invention relates to a method for detecting and avoiding memory leakage, which comprises: setting step that increasing a time label in the operation system to record the time that memory is occupied; evaluating step that memory manage module evaluates the time label when distributing memory blocks to record the system time that distributing said memory block and refreshing the value of time label into present system time when accessing the memory block; checking step that checking the time label of memory block; judging step that judging if the memory block occupy time is longer than the forced release time according to the time recorded in time label, and if it is longer, the memory block is leaked, or else, the memory block is not leaked. The invention can effectively judge if the memory block should be released, and directly release memory block when the leakage is detected.

The invention discloses a connector hard sealing structure for a corrugated stainless steel hose. The connector hard sealing structure comprises the corrugated hose, a nut and an externally threaded connector. The corrugated hose and the externally threaded connector penetrate into the nut from the two ends of the nut respectively and are connected through the nut. The connector hard sealing structure further comprises a split type clamping ring capable of stopping the nut from being disengaged, the clamping ring is arranged on the corrugated neck portion at the end of the corrugated hose which penetrates into the nut, and a ring cavity of the clamping ring is a cone. A pipe opening corrugated ring, placed in the ring cavity of the clamping ring, of the corrugated hose is a conical ring which is clamped on the conical face of the ring cavity of the clamping ring in a corrugation shaping mode. A metal ring is inlaid on the end conical face of the externally threaded connector with the nut and the corrugated hose screwed therein, and the end conical face of the externally threaded connector is matched with the conical ring. The connector hard sealing structure for the corrugated stainless steel hose is simple in structure, convenient to manufacture, rapid to dismount and mount, firm and reliable, capable of replacing an original rubber pad sealing structural mode, capable of achieving efficient sealing, high in practicability, low in material cost, small and exquisite in connector size, compact and attractive in appearance, high in superior product rate, long in service life and particularly suitable for rapidly connecting small-caliber metal hoses.

The invention discloses a tube flange gas leakage detection device, belonging to the petroleum chemical detection apparatus technical field, and comprises a gas port, a pneumatic joint, a micro negative pressure vacuum pump, a vacuum interface end, a gas source interface end, a detection silica gel tube, a pressure gauge, a pneumatic switch valve, a leak rate measuring instrument, etc. The tube flange gas leakage detection device is arranged on a pipeline, covers the periphery of a flange, and forms a cavity with a detected flange to accept tube flange leaked gas; in detection, the leak rate measuring instrument is communicated with an enclosed space through the silica gel tube. A calculation method is based on a tube flange leak rate formula derived by a gas state equation; the leak rate measuring instrument collects gas state parameters in an implementation process; a measuring instrument system processes data to obtain a tube flange leakage rate value. The device has the characteristics of less investment, simple operation, great practicality, and higher detection accuracy and result reliability, and is suitable for application and popularization.

The invention discloses a handheld aircraft fuel tank rapid three-dimensional map reconstruction device and reconstruction method. The device comprises an industrial camera, an inertial navigation sensor, a hand-held grip, a battery, a micro industrial personal computer and a wireless module. The method comprises the following steps: extracting angular point features for a current frame of pictureshot by a monocular camera in a fuel tank; then, realizing feature tracking of a next frame by utilizing an optical flow method for extracted angular points of the current frame; then obtaining posetransformation between two adjacent frames; reconstructing an initial feature point three-dimensional map in a three-dimensional manner; selecting a frame meeting a certain condition as a key frame inthe three-dimensional reconstruction process of the whole fuel tank, performing local sparse bundling adjustment on the selected key frame, performing integrated filtering on the selected key frame and an absolute-scale pose measured by an inertia module, and performing rapid three-dimensional dense reconstruction on the interior of the whole fuel tank of an airplane. The device and the method have the advantages that the efficiency is high, the cost is low, the real-time performance is realized, and the high-precision dense three-dimensional reconstruction can be realized in a narrow airplane complete machine.

The invention discloses a one-stop refitting process for steel drums, and belongs to the technical field of refitting and recycling of waste steel drums. The refitting process includes the steps of uncovering by an uncovering device, dust removing by a dust removing device, shot blasting by a shot blasting device, shaping by a shaping device, anti-rust treatment by an anti-rust device, baking by abaking device, spraying by a spraying device, and covering by a covering device. The refitting process has the advantages that the uncovering production efficiency is high, resource saving is betterachieved in dust removing, the cost is reduced, the shot blasting decontamination efficiency is higher, and paint spraying is more uniform.

The invention provides a pipe fitting leakage sealing and detecting device which is applied to the field of pipeline sealing and detecting of automotive pipe fittings. A fixed seat (5) and a base (6) of the pipe fitting leakage sealing and detecting device are connected. A gap is reserved between the fixed seat (5) and the base (6), a piston (7) and a pipeline (8) are arranged in the fixed seat (5), one end of the pipeline (8) is connected with leakage detecting equipment (9) providing leakage detecting liquid with pressure into the pipeline (8), the other end of the pipeline (8) extends to form a piston body portion (10) penetrating through the piston (7), and the piston (7) is set to extend to one side close to the base (6) when the leakage detecting equipment (9) provides the leakage detecting liquid with pressure. By pushing the piston with elasticity of a spring and pressure of the leakage detecting liquid, clamping force is increased, sealing at the left end face and the right end face of a ball head is improved, and pipeline leakage sealing and detecting of pipe fittings can be conveniently quickly completed.

The invention provides a detachable dilatation shock mitigation system provided jointed board type transferring case which can be dismounted and can be mounted again. The detachable dilatation shock mitigation system provided jointed board type transferring case is an expressage transferring box internally provided with an air bag system. According to the body of the transferring case, two kinds of boards including a joint slide plate and upper and lower cover plates are used for forming the dilatation hollow volume expressage transferring case with the joined air bag system; the size relationship between the single-sliding long and short dual-purpose tenon strip edges and single-siding double-mortise groove edge long and short dual-purpose mortise and tenon joint structures of the joint slide plate and all structure components meet a=b+c+c / 2 and the like, and the transferring case can be expanded into a large hollow extension transferring case in the longitudinal direction and in thetransverse direction. The detachable dilatation shock mitigation system provided jointed board type transferring case has the beneficial effects that only two kinds of boards are used for simply, quickly and conveniently jointing the transferring case, the case is very suitable for express delivery industry quick spliced transferring case use and us recycled by simple dividing into two kinds of boards, the expressage packaging pollution and waste are greatly reduced, the transferring case can achieve plane extension and multi-layer extension to form inner-separating-plate-free large hollow extension transferring case, the joined air bag system in the transferring case can reduce or avoid fillers, and shock mitigation and contained cargo protection can still be achieved.

The invention discloses three-way pipe welding equipment with a self-sealing detection function, and relates to the technical field of welding equipment. The three-way pipe welding equipment comprises a welding table, the welding table is provided with an aligning assembly for adjusting the position of a pipeline and a fixing assembly for fixing the aligned pipeline, a supporting plate is further mounted on the welding table through supporting columns, and a clamping and detecting assembly used for clamping the pipeline and detecting the sealing performance of the pipeline is mounted below the supporting plate. A straight pipe in a three-way pipe is fixed through the fixing assembly, a vertical pipe in the three-way pipe is fixed through the clamping and detecting assembly, and then welding of the three-way pipe is achieved; and after welding is completed, gas can be introduced into a three-way valve completed by a welding machine through a high-pressure gas tank, the sealing performance of the three-way pipe is detected through expansion of rubber balls and detection data of pressure sensors, then the production procedures of the three-way pipe are reduced, the production efficiency is improved, and manpower and material resources are saved.

The invention discloses a leakage detection method for a central air conditioner copper tube. A differential pressure airtight leakage detection instrument is employed, with a detection mode of double end symmetrical counteraction, one end of a detected copper tube is connected to a detected end of the airtight leakage detection instrument, one end of a low leakage qualified copper tube is connected to the standard end of the airtight leakage detection instrument, high-pressure nitrogen or compressed air is introduced into the air inlet of the differential pressure airtight leakage detection instrument, the other end of each of the detected copper tube and the standard copper tube is sealed through a plugging head, and the detection of gas filling, pressure releasing, balancing, testing and gas discharging processes of the detected copper tube and the standard copper tube is carried out through the airtight leakage detection instrument at the same time. The method gas the advantages of simplicity, rapidness, accurate and reliable data, visibility, and good stability, a test field is clean and easy to maintain, and the disadvantages of the waste of water, high test cost and an easily dirty test field environment in the traditional water detection process can be effectively reduced.

The invention relates to an underwater pipeline leakage detection device and method. An interlayer is arranged between insulating layers of an underwater oil transportation pipeline, multiple sectionsof calcium oxides (CaOs) wrapped by high-strength film are arranged in the interlayer, a partition is arranged between each section of the film, after the underwater pipeline leaks, the insulating layers are destroyed, the film wrapping the calcium oxides (CaOs) is destroyed, calcium hydroxide (Ca(OH)2) precipitation is generated in the interlayer after calcium oxide powder makes contact with water, a lot of heat is generated, and the specific formula is that CaO + H2O = Ca(OH)2) + a lot of heat. The temperature change is converted into a specific numerical change by a temperature sensor connected with the interlayer, and transmitted to the ground by a signal transmitter.

The invention discloses lithium battery sealing performance test equipment, and relates to the technical field of lithium battery sealing, and the lithium battery sealing performance test equipment comprises a supporting base, the upper end face of the supporting base is provided with a rotating groove with an upward opening, the upper side of the rotating groove is rotatably provided with a working rotating plate, the lower end of the working rotating plate is clamped with the rotating groove, and the working rotating plate is internally provided with a working cavity with a leftward opening; a fixed plate is fixedly arranged on the right wall of the working cavity, a detection cavity with a leftward opening is formed in the fixed plate, and symmetrical moving sliding grooves with leftward openings are formed in the upper side wall and the lower side wall of the detection cavity. The equipment generates high-frequency vibration, and then inputs the vibration force into a lithium battery to be detected, through vibration, the detection water can enter gaps in the lithium battery more easily, and the sealing performance of the lithium battery is detected; and meanwhile, the lithium battery is pushed to move through a reciprocating push plate, the detection water is promoted to enter the lithium battery in multiple directions, and the sealing performance of the lithium battery is further detected.

The invention discloses a cover plate of a recycle case capable of being disassembled and expanded and provided with a vibration reduction system and belongs to a cover plate of a recycle case which is internally provided with light articles of combined type air bags for filling and used for light-duty express delivery. The rim of an upper cover plate body and the rim of a lower cover plate body of the recycle case are provided with various components of clamped type connection structures. A cover plate body is internally provided with the combined air bags. Each combined air bag comprises anair inlet, an air guiding opening, air outlets, an air bidirectional valve and air bag rubber pieces, wherein each air inlet, the corresponding air guiding opening and the corresponding air outlets communicate with an air pipe. The cover plate has the beneficial effects that by means of the combined air bags, air pressure detection can be conducted independently; the cover plate can only be spliced with a special side plate into the recycle case with an internal space being expandable; in addition, the recycle case is provided with the vibration reduction system for goods; and the recycle caseis convenient to disassemble, and splice plates are easy to recycle.

The invention discloses equipment for detecting the sealing performance of medical protective clothing. The device specifically comprises a shell, a detection bin, protective clothing, a fixing hoop and a protective clothing fixing cylinder, wherein a door body is hinged to the middle position of one end of the shell, a control panel is arranged on the shell above the door body, a detection bin isarranged in the middle of the interior of the shell, a protective garment is fixed in the middle of the interior of the detection bin, a gas circulation cavity is formed in the side, close to the detection bin, between the shell and the detection bin, and a liquid circulation cavity is formed in the side, close to the shell, between the shell and the detection bin. The medical protective clothingsealing performance detection equipment is provided with the protective clothing fixing cylinder and a fixing hoop, cuffs, trouser legs and a collar of the protective clothing can be sealed, subsequent sealing performance detection is facilitated, and compared with traditional dummy simulated wearing, the fixing mode is more convenient, the tedious wearing and taking-off process is avoided, and detection efficiency is improved.

The invention relates to the field of gas leakage detection equipment, and discloses a measurement and detection device for gas leakage. The measurement and detection device includes an upper sealingsleeve and a lower sealing sleeve, the shape and size of the upper sealing sleeve are the same as the lower sealing sleeve, the shapes of the upper sealing sleeve and the lower sealing sleeve are in asemi-cylinder shape, semi-circular through holes of the same diameter are formed in the middle portions of the two sides of the upper sealing sleeve and the lower sealing sleeve, and semi-circular tubes located on the periphery of the semi-circular through holes are fixedly installed on the two sides of the inner cavities of the upper sealing sleeve and the lower sealing sleeve. According to themeasurement and detection device for gas leakage, through the structure design of the upper sealing sleeve, the lower sealing sleeve, the semi-circular tubes, air bags, a U-shaped tube and an exhaustmechanism, a flange joint of a pipeline to be inspected is sealed by using the upper sealing sleeve and the lower sealing sleeve, by detecting the displacement differences of liquid in the U-shaped tube in two periods, a slight gas leakage at a flange is detected, so that maintenance personnel can repair in time to avoid gas waste, and the maintenance personnel can measure the amount of gas leakage conveniently.

The invention discloses a goods recycle case capable of being assembled and restored and internally provided with an air bag system. The express delivery recycle case can be disassembled and reassembled and is internally provided with the air bag system. A body of the recycle case is provided with splice plates which are internally provided with combined air bags, so that the express delivery recycle case with the splice type air bag system is formed. The combined air bag of each splice plate comprises an air inlet, an air guiding opening and air outlets of an air pipe; each air guiding opening is connected with an air bidirectional valve, and each air bidirectional valve is located at the edge of the corresponding splice plate; and air bag rubber pieces having elastic expandability are bonded to the plate surfaces of the splice plates. The goods recycle case has the beneficial effect that by means of the splice type air bag system in the recycle case body, vibration can also be reduced without filler, so that goods contained in the goods recycle case are protected.

The present invention relates to a hose sealability detection device. The device comprises a box body; an air inflation pump is arranged at the bottom of the inner cavity of the box body; the air outlet of the air inflation pump is connected with a first flow guide tube; one end of the first flow guide tube passes through the other side of the box body; a first sealing ring is disposed at the end opening of the first flow guide tube; a first hose clamp is arranged to one side of the first sealing ring; the first flow guide tube is provided with a first check valve and a pressure relief tubewhich are sequentially arranged from the left side to the right side of the first flow guide tube; one end of the pressure relief tube passes through the lower end of the box body; the pressure relieftube is provided with a solenoid valve; a PLC is disposed above the air inflation pump; a water pump is arranged above the PLC; one side of the water pump is connected with a water incoming tube; thewater incoming tube passes through the top of one side of the box body; and the other side of the water pump is connected with a second flow guide tube. The hose sealability detection device has theadvantages of simple structure and reasonable design. With the hose sealability detection device of the invention adopted, a method that applies direct water injection to realize detection can be avoided, a drying step can be eliminated, work efficiency can be improved, and a leak point can be tracked when a hose leaks.

The invention relates to a dismountable-mountable and capacity-increasable jointed board type turnover box provided with a shock mitigation system. The dismountable-mountable and capacity-increasablejointed board type turnover box provided with the shock mitigation system is an express turnover box which can be dismounted, mounted, and internally provided with an airbag system. According to the turnover box, the internal-capacity-increasable express turnover box provided with the jointed airbag system is formed only by two kinds of plates including jointed side plates and upper and lower cover plates, wherein combined airbags are arranged in bodies of the jointed side plates and the upper and lower cover plates. Single slide long and short dual-purpose tenon strip sides, single slide double-mortise groove side long and short dual-purpose mortise and tenon joint structures, and various structural components of the jointed side plates meet the formula that a=b+c+c / 2, so that the turnover box can be longitudinally and transversely expanded into a large-internal-capacity expansible turnover box. The turnover box has the advantages that only the two kinds of plates can be easily and conveniently spliced to form the turnover box and are quite suitable for being quickly spliced into the turnover box used in the express industry, the turnover box can be simply disassembled into the two kinds of plates for recycling, and express packaging pollution and waste are greatly reduced; and the turnover box can be expanded in a plane mode and in a multi-layer mode so as to obtain the large-internal-capacity expansible turnover box free of internal partition plates, and the jointed airbag system in the turnover box can protect internal cargos in a shock mitigation mode even if filler isreduced or not used.

The invention provides a signal acquisition device. The signal acquisition device comprises a signal source, power supply electrodes, a detection electrode and a signal acquisition module. The power supply electrodes comprise the first power supply electrode and the second power supply electrode which are arranged in parallel in the horizontal direction and connected with two signal output ends of the signal source through power supply cables respectively. The signal source provides alternating signals for the power supply electrodes. The detection electrode is parallel to both the first power supply electrode and the second power supply electrode and connected with the signal acquisition module through a signal cable. According to the signal acquisition device, during laying of a vertical anti-seepage membrane, alternating signals are applied to two sides of the vertical anti-seepage membrane to acquire potential on the surface of the vertical anti-seepage membrane so that seepage property detection of the vertical anti-seepage membrane can be subsequently performed according to the acquired potential conveniently; by means of the signal acquisition device, the potential of a sampling point on the surface of the single side of the vertical anti-seepage membrane can be acquired accurately, and accordingly it is ensured that seepage detection can be performed on the vertical anti-seepage membrane accurately and effectively.

The invention discloses an assembly side plate of a transfer container capable of unloading and expanding and with a damping system, and belongs to assembly side plates capable of being disassembled as plane panels and light object and lighter good transfer containers capable of being quickly clamped to recover transfer containers. Single slide long-short dual-purpose tenon bar edges and single-slide double-mortise groove edge long-short dual-purpose mortises are arranged on two edges, in tenon-mortise connection with the other assembly side plate, of the assembly side plate; and the ratio ofthe thickness of the assembly side plate to the widths of the single slide long-short dual-purpose tenon bar edges to the groove internal depths of side surface deep-shallow dual-purpose mortise grooves to the groove internal depths of end surface shallow mortise grooves is 2: 2: 2: 1. The assembly side plate has the following advantages: mortises and tenons between the assembly side plates are all clamped in gapless connection to form minimum unit transfer containers; tenon-mortise parts between the assembly side plates are clamped with gaps to increase the connecting length to assemble as expansion transfer containers; the transfer containers can be simply and conveniently assembled by upper and lower cover plates; two plates are convenient to recycle; and assembled transfer container airbag systems can damp to protect internal goods through reducing or saving fillers.

The invention discloses a black box pressure-resistant storage tank for a submersible vehicle. The black box pressure-resistant storage tank comprises a pressure-resistant cylinder, an elliptical head, a flat welding flange, a cover plate, reinforcing ribs, lifting lugs and lug plates. A black box for the submersible vehicle is installed on a black box base through a black box fastener, and a black box cable penetrates out of a tank through a cable cup-shaped pipe joint on a pressure-resistant cylinder and is sealed through a pressing gasket, a sealing filler and a cup-shaped pipe joint nut on the cable cup-shaped pipe joint. The cover plate is attached to the sealing face of the flat welding flange filled with the O-shaped sealing ring through a stainless steel surfacing face, the cover plate and the sealing face of the flat welding flange filled with the O-shaped sealing ring are pressed and sealed through a connecting bolt, a gasket and a nut which are made of stainless steel, and a discharging semi-penetration pipe fitting used for filling gas into the tank so as to check the gas tightness is welded to the cover plate. The discharging semi-penetration pipe fitting after inspection is sealed through an insulation sealing gasket and a sealing nut, and the inner surface and the outer surface of the tank body and the inner surface and the outer surface of the tank cover are coated with anti-corrosion coatings. The storage tank is resistant to high pressure, waterproof and anti-corrosion, and cable connection, tightness detection and operation are facilitated.

The invention discloses a sagger detection device and a sagger detection method, and belongs to the field of quality inspection. According to the sagger detection device and the sagger detection method, the device comprises a chassis, a laminating plate and a protective cover. A bottom ring is arranged at the end part of the bowl body. A notch is formed in the outer wall of the bottom ring. The laminating plate is arranged in the bowl body. An air pressure detection head is mounted at the top of the laminating plate. A bottom plate is arranged at the bottom of the laminating plate. A limitingrod penetrates through the inner side of the bottom plate, a fixing frame is arranged on the outer wall of the limiting rod, a locking rod penetrates through the side of the fixing frame, a connectingrod is arranged on the right side of the fixing frame, a movable sleeve is arranged on the outer side of the connecting rod, a sliding rod is arranged at the bottom of the connecting rod, and a fixing base is arranged on the outer side of the sliding rod. The sagger body can be conveniently and rapidly adjusted and fixed by a user, saggers of different specifications can be conveniently and rapidly subjected to air leakage detection by the user, user operation and use are facilitated, and the structure is simple and efficient.

The invention discloses a sealing performance detection device for potato food production, which comprises two mounting plates. The outer walls of the ends, away from each other, of the two mounting plates are provided with the same first connecting frame; an electric telescopic rod is mounted on the outer wall of the bottom of the first connecting frame; a fixing plate is mounted on the outer wall of the bottom of the electric telescopic rod; two pressure sensors are installed on the outer wall of the bottom of the fixing plate; the same pressing plate is installed on the outer walls of the bottoms of the two pressure sensors; the same first electric conveying belt is installed on one sides of the outer walls of the opposite ends of the two mounting plates; and the other sides of the outer walls of the opposite ends of the two mounting plates are rotationally connected with the same rotating shaft. According to the device, by arranging the first connecting frame, the electric telescopic rod, the fixing plate, the pressure sensor and the pressing plate, extrusion detection can be conducted on packaging bags conveyed to the containing plate, operation is convenient, unqualified packaging bags can be accurately distinguished, and workers can use the device conveniently.

A pipe (50) that makes it possible to channel pressurized air into an aircraft, includes an inner tube (52), an outer tube (54) that is essentially coaxial to the inner tube (52), an insulating material (56) that is inserted between the two tubes (52, 54) and that is made of a heat-insulating and gas-porous material, and a leak detection device (70), characterized in that the leak detection device (70) is arranged at least in part between the inner tube (52) and the outer tube (54) and in that at least at one end (60), the detection device follows a concentric trajectory (84) to the inner tube (52).