68results about How to "Improve structural tightness" patented technology

The invention embodiment discloses a hollow glass and a manufacture method thereof; the hollow glass comprises a first glass layer, a second glass layer and a glass support frame; the first and second glass layers are bonded by the glass support frame through an intermediate coat; an inflation space is formed between the first and second glass layers, and filled with inert gas. The hollow glass can greatly reduce gas leak and moisture intrusion probability, thus greatly improving composition intensity and sealing performance of the hollow glass without adding manufacture cost.

The invention discloses a lip-seal clamping and pressing type pipe fitting connector and an installation process of the lip-seal clamping and pressing type pipe fitting connector. The lip-seal clamping and pressing type pipe fitting connector comprises a pipe fitting, a pipe and a seal ring, wherein the pipe fitting is provided with a bell mouth, the pipe is inserted in the bell mouth of the pipe fitting, the seal ring is located between the inner side wall of the bell mouth of the pipe fitting and the outer side wall of the portion, where the pipe is inserted, of the bell mouth, and the seal ring is provided with a main ring and a ring lip. The ring lip of the seal ring is of a cylindrical cone shape, and the included angle between the ring lip and the axial direction of the pipe is 0-89 degrees. The ring lip of the seal ring is attached to the outer wall of the pipe, and a seal and stretching quantity ratio of 10-35 percent is kept. The outer diameter of the main ring of the seal ring is attached to an inner annular groove of an outwards-protruding ring of the pipe fitting, and sealing compression is kept. The lip-seal clamping and pressing type pipe fitting connector and the installation process of the lip-seal clamping and pressing type pipe fitting connector have the advantages which are unavailable in the prior art that the lip-seal clamping and pressing type pipe fitting connector is simple in structure, good in sealing performance, long in service life and the like.

The invention discloses a double-layer differential-pressure air-supported membrane structure. The double-layer differential-pressure air-supported membrane structure comprises an inner membrane and an outer membrane which are arranged on a bottom surface in an arched manner. A sealed inner membrane cavity is formed between the inner membrane and the bottom surface. A sealed double-layer membrane sandwich cavity is formed among the outer membrane, the inner membrane and the bottom surface. A communicating device is arranged between the inner membrane cavity and the double-layer membrane sandwich cavity. The communicating device comprises an inner-membrane ventilation hole formed in the top of the inner membrane and a sandwich ventilation pipe arranged in the double-layer sandwich cavity. The air inlet end of the sandwich ventilation pipe is connected with the inner-membrane ventilation hole. The air outlet end of the sandwich ventilation pipe is arranged at the bottom of the double-layer membrane sandwich cavity. A fan arranged outside the outer membrane supplies air for the inner membrane cavity. The pressure intensity of the inner membrane is larger than that of the outer membrane. The pressure intensity of the outer membrane is larger than the intensity of atmospheric pressure outside the outer membrane. The double-layer differential-pressure air-supported membrane structure has the advantages that the stability of the double-layer membrane structure is achieved through pressure intensity difference, and the double-layer differential-pressure air-supported membrane structure is convenient to mount and high in safety.

The invention discloses an inner container used for an electric oven and an electric oven provided with the inner container. The inner container used for the electric oven comprises a U-shaped plate and an L-shaped plate. The U-shaped plate comprises a left side plate, a right side plate and a first connecting plate; the left side of the first connecting plate is connected with the left side plate, and the right side of the first connecting plate is connected with the right side plate. The L-shaped plate comprises a rear side plate and a second connecting plate; the rear side of the second connecting plate is connected with the rear side plate; the left side plate, the right side plate and the first connecting plate of the U-shaped plate are connected with the rear side plate respectively; the left side plate and the right side plate of the U-shaped plate are connected with the second connecting plate respectively. According to the inner container used for the electric oven, the number of screws, buckle structures and the like required by assembly of the inner container can be reduced, and therefore the cost is reduced; in addition, the structural strength and the sealing performance of the inner container can be greatly enhanced, and then the sealing performance of the electric oven provided with the inner container can be improved.

The invention relates to the technical field of ocean engineering accessory devices, in particular to a separating type underwater wellhead suction force anchor in efficient machining and transporting. Disassembling and installing are convenient, the production cost and the transporting cost are lowered, the structural stability and the sealing performance are improved, and a basic guarantee is provided for smoothly building a well. A suction force anchor barrel body with the top of a lower end opening sealed is included; the suction force anchor barrel body comprises separating type anchor barrel plate shell sets; every two adjacent sets of anchor barrel plate shells are sealed through a plurality of first rubber strips; the anchor barrel plate shells in each set are connected through positioning bolts; the top of the suction force anchor barrel body is provided with separating type sealing cover sets; the number of the anchor barrel plate shell sets is equal to that of the separatingtype sealing cover sets; every two adjacent sets of separating type sealing covers are sealed through a plurality of second sealing strips; and the two sets of separating type sealing covers are eachprovided with a water pumping hole.

The invention discloses a high-temperature superconducting motor and a low-temperature holding container thereof. The low-temperature holding container comprises an outer cylinder and an inner cylinder, wherein the outer cylinder has a first accommodating cavity for accommodating the stator of the high-temperature superconducting motor and the inner cylinder; the inner cylinder has a second accommodating cavity for accommodating the rotor of the high-temperature superconducting motor rotor; the inner cylinder is disposed in the first accommodating cavity; the outer cylinder has openings at both ends and is in sealed connection with the inner cylinder through a sealing mechanism; and an annular region for accommodating the high-temperature superconducting motor between the inner cylinder and the outer cylinder is filled with a coolant. The rotor of the motor is arranged in the inner cylinder and the stator of the motor is arranged between the inner cylinder and the outer cylinder so asto ensure the high-speed rotation of the rotor of the motor. The outer cylinder is filled with the coolant for cooling, thereby satisfying requirements for high power density, high efficiency, simplecooling, and low cost, solving the problem that a conventional superconducting motor forces the low-temperature holding container to leak heat in order to transfer the stator electromagnetic force from the low-temperature holding container to the outside, and avoiding a danger that the low-temperature holding container is damaged by stress and deteriorates in heat insulating effect.

The invention discloses high-strength metal ceramic used for cutting a nonferrous metal sheet and a preparation method thereof. The preparation method includes the following steps that a, original TiC powder, original Mo powder, original Ni powder and NbC powder are taken and ground through a ball milling medium for 48-64 h, and then slurry is obtained, specifically, the average fisher particle size of the original TiC powder is not greater than 1.0 [mu]m, and the mass ratio of the original TiC powder is 44%-46%; the average fisher particle size of the original Mo powder is not greater than 1.0 [mu]m, and the mass ratio of the original Mo powder is 14%-16%; the average fisher particle size of the original Ni powder is not greater than 1.0 [mu]m, and the mass ratio of the original Ni powder is 38%-40%; the average fisher particle size of the NbC powder is not greater than 1.0 [mu]m, and the mass ratio of the NbC powder is 0.8%-1.2%; the ball milling medium comprises hard alloy bar balls and absolute ethyl alcohol, or comprises hard alloy bar balls and No.120 aviation gasoline; b, the slurry obtained through the step a enters a stainless steel container through a stainless steel screen; and c, after the slurry is subjected to standing in the stainless steel container for 24 hours and under the condition that the ball milling medium comprises the hard alloy bar balls and the absolute ethyl alcohol, the absolute ethyl alcohol on the upper layer of the slurry is taken out.

The invention discloses a microminiature integrated atom gas chamber for a nuclear magnetic resonance gyroscope. The microminiature integrated atom gas chamber consists of an inflating pipe, an air chamber base body, an air chamber top plate and an air chamber bottom plate, wherein the air chamber base body is of a trapezoidal table structure; a center through hole is formed in the air chamber base body; a flow guide groove and a transition groove are formed in the bottom surface; four inclined side surfaces of the air chamber base body are reflecting surfaces; the air chamber top plate and the air chamber bottom plate are all rectangular plates; the top surface and the bottom surface of the air chamber base body are respectively connected with the air chamber top plate and the air chamberbottom plate in a sealed way; the center through hole is sealed by the air chamber top plate and the air chamber bottom plate and form an air chamber cavity; an air guide hole communicated with the inflation pipe is formed in the air chamber bottom plate; the inflation pipe, the air guide hole, the transition groove, the flow guide groove and the air chamber cavity are sequentially communicated.The atom chamber is favorable for the miniaturization of the nuclear magnetic resonance gyroscope; composition elements are few; the wall thickness can be greater; in addition, the sealing connectionsurface is greater; the structure intensity and the sealing performance of the atom air chamber are improved; the double-light-path detection can be realized through the nuclear magnetic resonance gyroscope.

This invention involves a naphthol modified phenolic resin and its preparation. The technical characteristics lie on the ratio of the components: 100 phenol, solid paraform 40 - 45, naphthol 10 - 15 and fiberglass 55 -60, polysulfone 10- 20, sodium pentachlorophenate 2 - 5, solvents 94 -100. Through the stir conditions adding naphthol into phenol, adding certain proportion of the solid paraform and polysulfone. In reactor adding solvents, resin diluted, and joined the sodium pentachlorophenate; fiberglass couple treated then uniform impregnation, after drying, postbaking, processing pelletizing and molding.

The invention relates to an underwater pressure cabin for monitoring a marine environment. The underwater pressure cabin comprises an underwater pressure cabin body (10), an upper sealing end cover (18) and a lower sealing end cover (6), wherein a sealing end ring (15) and a sealing end ring (8) are respectively arranged on the upper sealing end cover (18) and the lower sealing end cover (6); a mounting groove (25), an inner convex ring wall (13) and an outer convex ring wall (14) are respectively formed in the middle of the inner side end part and on the two sides of the upper sealing end cover (18); a mounting groove (25), an inner convex ring wall (4) and an outer convex ring wall (3) are respectively formed in the middle of the inner side end part and on the two sides of the lower sealing end cover (6); mounting bosses (17) and (7), inner grooves (23) and (21) and outer grooves (22) and (20) are respectively formed in the middle, and the upper end part and the lower end part of the two sides of the circumferential cabin wall of the underwater pressure cabin body (10); the mounting grooves (25), the inner convex ring walls (13) and (4), the outer convex ring walls (14) and (3), the mounting bosses (17) and (7), inner grooves (23) and (21) and outer grooves (22) and (20) are matched and mounted into a whole; and a protecting layer (11) is arranged on the outer circumferential cabin wall of the underwater pressure cabin body (10). The process has the characteristics of simple structure, high seawater pressure resistance and seawater corrosion resistance, strong strength, relatively high sealing property and the like.

The invention discloses a water stopping method applied to a joint of a hydropower station and a water stopping structure thereof. The method comprises the following steps: firstly carrying out surface treatment, then mounting a rubber rod and caulking a plastic packing, and finally scraping polyurea elastomers out. The water stopping structure formed according to the method comprises a concrete panel (2) with a joint (1), wherein a joint reservation groove (3) is formed above the joint (1); a rubber rod (4) is connected with the interior of the joint reservation groove (3); a plastic packing (5) is arranged above the rubber rod (4); a base fabric (6) is arranged above the plastic packing (5); polyurea elastomers (7) are arranged on the upper side and the lower side of the base fabric (6). According to the water stopping method and the water stopping structure, the rubber rod is used for preventing the water pressure change and the joint deformation from causing damage to the plastic packing; the base fabric is used for dispersing the stress in the polyurea elastomers; the damage to the concrete panel can be avoided; the structural stability is improved; the advantages of convenience in construction and excellent water-stopping effect are achieved.

The invention relates to the technical field of LED display screens, in particular to a double-heat-conductive-piece clamping-plate-type LED display unit module. The module comprises a sealing glue body, a heat conductive panel, a heat conductive back panel, a heat conductive column and an LED displaying lamp panel which is composed of circuit boards, an IC chip and an LED illumination tube; the circuit boards overlap one another and are clamped between the heat conductive panel and the heat conductive back panel, a lamp body passing hole is formed in the part, corresponding to the LED illumination tube, of the heat conductive panel, the heat conductive column penetrates through the heat conductive back panel and the circuit board and is fixedly locked on the heat conductive panel, and thesealing glue body covers the heat conductive panel and at least integrally wraps the heat conductive panel and the LED displaying lamp panel. According to the module, the heat conductive panel and the heat conductive back panel are utilized to form a double-layer heat conductive piece which clamps the LED displaying lamp panel, rapid heat conductivity and outward heat dissipating can be conductedon the heat generated by the direct shining of the sun and the heat generated by the LED displaying lamp panel with the cooperation of the heat conductive column, the structural sealing performance of the whole module can be enhanced by using the sealing glue body, secondary locking can be conducted on the heat conductive panel, the LED displaying lamp panel and the heat conductive back panel toensure the stability of the structure of the module.

The invention discloses a dust-proof rolling bearing with a spring card position limit, which comprises: a bearing outer ring and a bearing inner ring, the bearing inner ring is concentrically arranged in the bearing outer ring, the bearing outer ring inner wall and the bearing inner ring There is a circle of cylindrical swivels between them for rolling connection, and the outer ring of the bearing is provided with sealing rings on both sides of the cylindrical swivels, and balls are respectively arranged between the inner surface of the sealing ring and the end of the cylindrical swivels. Rolling connection, the outer ring of the bearing is respectively provided with spring clips located outside the sealing ring. The dust-proof rolling bearing with a spring clip limit according to the present invention uses a spring clip to limit the position of the sealing ring, thereby improving the structural stability and dust-proof sealing effect of the sealing ring. The rotation resists the friction of the cylindrical swivel, improves the axial support of the cylindrical swivel, and has good structural stability.

The invention discloses a steering middle shaft protection cover assembly which comprises a sealed connecting plate, a connecting cylinder, a pressing plate, a support shell and a sealing ring. A plurality of installation holes are distributed in the edge part of a first surface of the sealed connecting plate; a second surface opposite to the first surface is connected with a vehicle body; the sealed connecting plate is made of a soft material; the connecting cylinder is fixed to the first surface of the sealed connecting plate and is in seamless connection with the first surface of the sealedconnecting plate; an inner hole of the connecting cylinder extends to the second surface; the connecting cylinder is made of an elastic material; the pressing plate sleeves on the periphery of the connecting cylinder and is detachably connected with the first surface of the sealed connecting plate; a plurality of second installation holes in one-to-one correspondence with the first installation holes are formed in the pressing plate; an outer wall of the support shell is connected with an inner hole of the connecting cylinder in a sleeving way; a third installation hole for sleeving a steering middle shaft, and a first installation cavity and a second installation cavity for installing the sealing ring are arranged in the support shell; and the sealing ring is connected with an outer wallof the steering middle shaft in a sleeving way. According to the steering middle shaft protection cover assembly provided by the invention, a supporting function and a sealing performance of the protection cover can be improved.

The invention discloses a high-temperature-resistant flame-retardant cable, which comprises a plurality of cable cores. Each cable core is externally wrapped by a PLA layer and a first shielding layerin sequence. The first shielding layers are externally provided with waterproof sheathings in vertically corresponding arrangement, and the waterproof sheathings in vertically corresponding arrangement are internally provided with a storage groove in which the cable cores are positioned. The waterproof sheathings are externally wrapped by a second shielding layer which is externally wrapped by ahalogen-free flame-retardant TPU layer, and a double-layer insulating sleeve outside the halogen-free flame-retardant TPU layer is externally provided with a flame retardant coating. The high-temperature-resistant flame-retardant cable has advantages of high temperature resistance and flame retardation, great structural airtightness, environmental friendliness, high safety factor, low production cost and the like.

The invention discloses vacuum diffusion welding equipment for high-light-transmittance borosilicate glass and a using method of the vacuum diffusion welding equipment. The vacuum diffusion welding equipment comprises a supporting bottom plate, a cleaning tank, a heating box and a cooling tank, and the top of the supporting bottom plate is provided with the cleaning tank, the heating box and the cooling tank. By adopting the welded glass structural part, the formed glass is a unified whole, cannot be split, is high in structural strength and sealing performance, plays a role in protecting the product structural design, has the same light transmittance as the glass before welding, can be used for special applications such as photocatalytic reaction, does not add materials such as welding flux and brazing filler metal in the forming process, and is low in production cost. Stainless steel is selected as a solder resist material, the surface and light transmission performance of the glass are not affected, a heating-pressurizing heat preservation-heating-pressure relief heat preservation-cooling process curve is adopted in the method, the main significance is to eliminate a glass welding seam interface, meanwhile, plastic deformation of the glass structure is reduced, and the heat preservation performance of the glass is improved. The light transmittance of the glass is improved.

The invention discloses an adjustable needleless infusion connector, and relates to the field of medical instruments, the adjustable needleless infusion connector comprises a positive end, an adjusting assembly is arranged in the positive end, an internal thread is arranged at the lower part in the positive end, a connector is connected to the top of the positive end, a negative end is connected to the top of the connector, and an external thread is connected to the upper part of the outer surface of the negative end. Through the sealing piece, the hollow rubber sleeve, the sealing plate, the elastic reset ring and the rubber connecting belt, when the negative end is connected into the connector, the sealing piece is stressed to deform towards the two sides so that liquid medicine can enter the connector, meanwhile, the two sides of the sealing piece extrude the hollow rubber sleeve and the elastic reset ring, and the elastic reset ring is similar to a spring in appearance; however, after being extruded, the elastic reset ring expands to increase the diameter of the structure to store force instead of being compressed to store force like a spring, meanwhile, the hollow rubber sleeve is arranged to avoid the contact phenomenon of liquid medicine and the elastic reset ring caused by liquid seepage on the two sides after the sealing piece is aged, and meanwhile, the metal structure does not make contact with the liquid medicine to delay the aging of the structure.

The invention discloses a punching-welding axle housing for an automobile. A main body comprises a punching-welding axle housing body, an axle housing fixing bolt, an axle housing fixing lug plate, anaxle housing leakage-proof gasket, an axle housing oil drainage bolt, an overhauling oil drainage end housing and an automobile axle cross rod, the axle housing fixing lug plate is arranged on the side surface of the punching-welding axle housing body, the side surface of the punching-welding axle housing body is connected with an automobile axle cross rod, the overhauling oil drainage end housing is arranged on the side face of the automobile axle cross rod, the axle housing fixing bolt is arranged on the edge of the overhaul oil drainage end housing, the axle housing leakage-proof gasket isarranged on the side face of the axle housing fixing bolt, and the axle housing oil drainage bolt is arranged on the side face of the overhaul oil drainage end housing.

The invention relates to the technical field of shield tunneling machine manufacturing, in particular to a block type shield tunneling machine factory assembly method. The method comprises the following steps that a, a main machine station support is arranged; b, a front shield is divided into a plurality of blocks, and a front shield bottom block is first loaded on a station; c, a middle shield is divided into a front part and a rear part, then the front part of the middle shield is re-divided into a plurality of blocks, firstly, a middle shield front lower block is loaded on the station, andthe front shield bottom block is in hard connection with the middle shield front lower block; d, a main drive is loaded on the station; e, front shield remaining blocks are loaded on the station oneby one and are assembled with the adjacent blocks; f, middle shield remaining blocks are loaded on the station one by one; g, a whole middle shield rear part and a propulsion oil cylinder are sequentially loaded on the station; h, a tail shield is divided into a plurality of blocks, and a tail shield lower block is firstly loaded on the station; and i, tail shield remaining blocks are loaded on the station one by one. According to the method, shield station assembly is free of dependence on hoisting equipment, hoisting and turnover are more convenient, the safety performance is greatly improved through a reasonable assembly sequence, and the assembly difficulty of a block type shield tunneling machine is reduced.

The invention discloses a carriage plate which comprises a plurality of carriage plate units spliced end to end, each carriage plate unit comprises a plate body part, a first splicing end and a second splicing end, the first splicing ends and the second splicing ends are arranged on the two sides of the plate body parts respectively, and every two adjacent single carriage plate units are spliced into a whole. The first splicing end of one compartment plate unit is connected with the second splicing end of the other compartment plate unit; wherein the first splicing end comprises an outer inserting edge, a buckling groove provided with a buckling space and an inner connecting edge, the second splicing end comprises an inner landing edge used for being connected with the inner connecting edge, an inserting groove provided with an inserting space and a buckling edge, the outer inserting edge is provided with an inserting head inserted into the inserting groove, the buckling edge is provided with a buckling end buckled into the buckling groove, and the inner landing edge is provided with an inserting head inserted into the inserting groove. Glue pouring spaces used for glue pouring are further arranged in the inserting grooves and the buckling grooves. The invention further discloses a production process of the carriage plate correspondingly. The LED lamp is simple in structure, good in waterproofness and simple in assembly process.

The invention discloses a fuel cell and a galvanic pile structure thereof. The galvanic pile structure comprises a housing in which an accommodating cavity with an open upper end is defined; a reactor core which is arranged in the accommodating cavity; a first end plate and a second end plate, wherein the first end plate is arranged at the upper end of the reactor core, the second end plate is arranged at the lower end of the reactor core, a positioning piece is mounted on one side, facing the inner bottom surface of the shell, of the second end plate, a positioning blind hole is formed in the inner bottom surface of the shell, the positioning piece can be matched in the positioning blind hole, and the positioning piece and the positioning blind hole are arranged at an interval in the vertical direction. According to the electric pile structure of the fuel cell, the structure is greatly simplified, the production cost is reduced, the sealing performance of the electric pile structure is improved, and the risk of electric pile leakage is reduced.

The invention discloses a telescopic device for a tattooing instrument. A motor works to drive a single-surface oblique circular table to rotate, a first connecting shaft penetrates through a first through hole, props against one side of an oblique plane of the single-surface oblique circular table under the effect of a spring, the single-surface oblique circular table extrudes the first connecting shaft to do a rectilinear motion in the first through hole, and the first connecting shaft drives a second connecting shaft to do a rectilinear motion. The telescopic device has the advantages thatthe outer diameter of the single-surface oblique circular table is accordant with the inner diameter of a second shell on a second step surface, and the outer diameter of a middle circular table is accordant with the inner diameter of a third shell on a third step surface, so that the integral structure can be configured to be more compact, internal gaps are less, the bulk density is higher, and the texture is better; situations of excessive deformation, louder noise and larger vibration caused by a larger extrusion force of the first connecting shaft during high-speed rotation are avoided; and the telescopic speed is smooth.

The invention discloses a linear actuator. The linear actuator comprises a speed reducer housing, wherein a motor is arranged at one end of the speed reducer housing, and a secondary planet carrier isarranged at the other end of the speed reducer housing; a motor base fixedly connected with the motor is arranged at the position, close to one end of the motor, of the interior of the speed reducerhousing, and the motor base and the speed reducer housing are relatively static; a planet wheel set matched with the secondary planet carrier is also arranged in the speed reducer housing; and the inner end face of the motor base is provided with a first sealing ring adapted to the planet wheel set. The sealing effect of components of the linear actuator is good, there is no leakage of lubricatinggrease or dust particles in the working process of the linear actuator, and it is fully ensured that the linear actuator can run stably.

The invention discloses an engine support. The engine support comprises a main board. A plurality of mounting holes matched with an engine are formed in the main board, the circumference of the main board extends downward to form a retaining sleeve, a positioning piece extending from the retaining sleeve is inserted into the engine, and a limiting piece parallel to the main board is arranged on one side of the retaining sleeve. With the aid of the fit of the limiting piece and the positioning piece, the relative fixation of the support and the engine is achieved, the situation that the overallstrength of the support is affected due to the fixation by welding is avoided, , and the service life of the support is prolonged. With the aid of detachable connection between a fixed plate and themain board, the limiting piece is convenient to install.

The invention relates to the technical field of power device cabinet assembly, in particular to a rapid locking device and a control cabinet. The device comprises a base, a first supporting body, thelower end of which is connected with the upper face of the base, and a second supporting body, the lower end of which is connected with the upper end of the first supporting body, wherein a blocking body is arranged on the side face of the first supporting body, a thread is arranged on the outer side face of the second supporting body, and the thread is sleeved with a nut. A spring is arranged between the lower side of the nut and the upper end of the first supporting body, the outer side face of the second supporting body is further sleeved with the spring, and the nut can move along the threads and extrude or release the spring to deform. The rapid locking device solves the technical problem that electrical elements cannot be quickly installed due to the arrangement of the rapid lockingdevice and the power control cabinet, and the technical effect of improving the installation efficiency is achieved.

The invention discloses a gas generator for a zinc-silver reserve battery and a preparation method of the gas generator, and belongs to the technical field of zinc-silver reserve batteries. The gas generator comprises a gas generating assembly, one end of the gas generating assembly is detachably connected with an ignition component, the other end of the gas generating assembly is provided with a gas guiding assembly, and the gas generating assembly is provided with a gas spraying hole communicated with the interior of the gas guiding assembly. The conductive column is connected with the short shell in a glass sealing mode, the sealing performance is good, the insulation performance of the conductive column is guaranteed, and the structural strength and the sealing performance of the gas generator can be improved. The mode that the pressing ring is in threaded connection with the short shell is adopted, the sealing film is pressed to seal the pyrotechnic composition, the structure is simple, operation is convenient and fast, the assembling technology is simplified, the threaded connection length can be adjusted according to the amount of the pyrotechnic composition through threaded connection sealing, and adaptability is high.

The invention belongs to the technical field of medical instruments, and particularly relates to a medical intubation tube. The problem that the prior art is unreasonable in design is solved. The medical intubation tube comprises a spring inner tube, the spring inner tube is sleeved with a metal net tube, the metal net tube is sleeved with a sleeve, and the sleeve is sleeved with a sheath shorter than the sleeve; two installing regions are formed at the two ends of the sheath and the two ends of the sleeve respectively, one installing region is connected with a connecting sleeve with one end abutting against the corresponding end of the sheath and provided with an annular groove and a sealing sleeve which is arranged in the annular groove and located between the annular groove and the connecting sleeve, the other end of the connecting sleeve is suspended, and an inner thread is arranged on the inner wall of the suspended end of the connecting sleeve. The medical intubation tube has the advantages of being good in seal performance and high in practicability.

The invention provides a bamboo board for box body combination and a manufacturing method thereof. The manufacturing method comprises the following steps that firstly, bamboo chips are pretreated; secondly, pressing and combining are carried out; thirdly, a bamboo board is cut into the needed size; fourthly, grooves and protruding strips perpendicular to the width direction of the bamboo board and / or the length direction of the bamboo board are arranged on the edge of the bamboo board, the grooves are adjacent to one sides of the protruding strips, and 45-degree inclined planes located on the same plane are arranged on the outer sides of the grooves and the outer sides of the protruding strips; and or an inclined plane of 20-70 degrees is cut on the edge of the bamboo board, a groove and a protruding strip are arranged on the inclined plane, the groove is adjacent to one side of the protruding strip, and the groove is matched with the protruding strip. The structural strength and quality of the bamboo boards are effectively improved, the bamboo boards are formed by pressing a plurality of longitudinally arranged bamboo chips, the fiber textures of the bamboo boards are smooth and clear, meanwhile, the stress, extrusion wear resistance, impact resistance and falling resistance of the bamboo boards after use are improved conveniently, the connecting and sealing effect between the bamboo boards is improved, and the service life of the box body and the bamboo boards is prolonged.

The invention provides a magnetic attraction door assembly. A main magnetic attraction assembly extending in the circumferential direction of a door plate is arranged on the edge portion of the door plate; the main magnetic attraction assembly comprises a base frame fixed to the door plate, a main magnetic attraction strip embedded in the outer side of the base frame and a main magnet packaged in the main magnetic attraction strip, and the outer wall of the main magnetic attraction strip is obliquely arranged relative to the main extension face of the door plate; an auxiliary magnetic attraction assemby matching the main magnetic attraction assembly in an aligned mode is arranged on the edge portion of a door frame in the circumferential direction of the door frame; the auxiliary magnetic attraction assembly comprises a soft sealing strip fixed to the door frame, and an auxiliary magnet matching the main magnetic attraction strip in a magnetic attraction mode are embedded in the soft sealing strip; when the door plate and the door frame are closed, the outer wall of the soft sealing strip is matched with the outer wall of the main magnetic attraction strip in an aligned attaching and abutting mode. According to the magnetic attraction door assembly, the structural adaptability between the door plate and the door frame of the magnetic attraction door assembly is good, and the structural sealing performance and the sound insulation effect are good after the magnetic attraction door is closed.