33results about How to "Elastic influence" patented technology

The invention relates to a sealing device for a cone bit for petroleum, natural gas, mine and geological drilling, and belongs to the technical field of mechanical devices. The high-temperature resistant floating sealing device consists of a movable sealing ring, a stationary sealing ring, a welding corrugated pipe, a movable ring seat and a sand prevention seal; and the movable sealing ring, the stationary sealing ring, the welding corrugated pipe and the movable ring seat are mounted in a sealed cavity formed by an inner bore and a bit leg of a cone; the movable sealing ring is fixed on the cone through the welding corrugated pipe and the movable ring seat and can rotate along with the cone, and the movable sealing ring and the stationary sealing ring are tightly attached to form a movable seal for blocking the drilling fluid at the outer side of the welding corrugated pipe and the lubricant at the inner side of the welding corrugated pipe. The sand prevention seal comprises a rubber block and a steel wire block. According to the floating sealing device, the welding corrugated pipe is adopted to replace a rubber elastic element, so the movable seal is enabled to stably operate at high temperature; the welding corrugated pipe adopts a stepped slice structure and can prevent sediment from depositing in the outer side of the corrugated pipe; and the movable ring seat and the stationary sealing ring are prevented from falling off.

A mattress body having a mattress body having a box spring with a number of springs disposed therein at specific intervals; two cushion layers on top and bottom sides of the box spring; and at least one cushion member disposed on one or both surfaces of the two cushion layers; additionally comprising: a sidewall member molded from foam for surrounding the mattress body; and a A mattress covering is used to cover the structure of the mattress body and the side wall members.

The invention discloses a method for preparing reclaimed polyester bottle chip spun fine denier moisture absorption and sweat release full drawn yarn (FDY) polyester filament fibers. The method comprises the following steps of: 1, pre-crystallizing materials which are reclaimed polyester bottle chips by adopting dry hot air; 2, performing screw feeding on the materials, namely feeding the dried reclaimed polyester bottle chips into a screw extruder by electromagnetic vibration; 3, filtering the melt extruded by the extruder, wherein continuous production of spun yarns and constant pressure of the screw extruder are ensured during filtering; and 4, spinning, namely feeding the mixture from a filter into a spinning assembly, jetting fibers from an spinneret plate with five-leaf spinneret holes through the spinning assembly, and then performing drafting, sizing, winding and shaping. The prepared reclaimed polyester bottle chip spun fine denier moisture absorption and sweat release FDY polyester filament fibers have good durability, size stability and good moisture absorption and sweat release functions.

The invention discloses a preparation method of PBT silver-ion antibiotic moisture-absorption deodorization fibre, which comprises the following steps of: (1) crystallizing a material in advance, wherein the material is the mixture of a PBT slice and a silver-ion SHT antibiotic plastic master batch; concretely, crystallizing in advance by adopting dry hot air; (2) feeding the material in a screw type: firstly, drying the master batch by the hot air and then feeding the material obtained after mixing the master batch and the PBT slice into a screw extruder by a special master batch feeding machine which can measure the master batch; (3) filtering: filtering the mixture extruded by the extruder wherein the continuous production of spinning and the constancy of the pressure of the screw extruder are ensured during filtering; and (4) spinning: delivering the mixture from the filter to a spinning assembly, ejecting from a spinneret plate by the spinning assembly, and then coiling and forming. The fibre has favorable durability, dimensional stability and better elasticity, and the elasticity is free from the influence of the humidity.

The invention relates to a production technology of thin elastic cotton and polyester interwoven fabric. The production technology sequentially includes the steps of material preparation, pre-production preparation, weaving, billet repairing, cloth turning, singeing, desizing, forming, mercerization and after treatment. In the weaving process, an independent waste edge opening device is arranged on one side of a weaving machine. A step-by-step amplitude preshrinking process is added between the singeing process and the desizing process, the fabric is made to pass through 2-3 warm water tanks sequentially before desizing is conducted, and the temperature of the warm water tanks is increased gradually. The thin elastic cotton and polyester interwoven fabric produced through the production technology can avoid edge weft shrinkage, the elastic stability and cloth cover smoothness of the cloth are improved, the inner stress of the fabric is even, the shrinkage stability is good, and the fabric is smooth and free of wrinkles.

The invention provides a minced fillet clean production method. The minced fillet production method comprises the following steps of: sequentially sterilizing and cleaning fields and devices, and butchering fresh fish matching national standard; and cleaning and sterilizing fillets, collecting fish, cleaning minced fillet, carrying out fine filtering, dehydrating, packaging, detecting metal, quickly freezing, and storing in a freezing manner, wherein a disinfectant in the fillet sterilizing process is one or random mixture of food-level chlorine dioxide, ozone and sodium hypochlorite. According to the minced fillet clean production method, disclosed by the invention, only one or random two of food-level chlorine dioxide, ozone and sodium hypochlorite are used for sterilizing, thus the total number of microorganism bacteria and the number of escherichia coli in semi-finished products of the minced fillet can be effectively reduced, the safety of the minced fillet is effectively improved, no harmful effect on the gelation, the elasticity and the like of the minced fillet exists, and effective guarantee is provided for the treatment of the minced fillet products; and in addition, by adding a quality improver, the quality of the minced fillet is improved and the retention time of the minced fillet is prolonged.

The invention discloses a key structure, which includes a base plate, a key cap, a scissors foot support frame, a linkage bracket, a movable member and a magnetic attraction member, wherein the scissors foot support frame is connected with the base plate and the key cap; the movable member is slidably arranged relative to the base plate; the linkage bracket is rotatably arranged on the base plate and provided with a magnetic attraction part and a driving part; and the magnetic attraction member is arranged on the movable member and can generate magnetic attraction with the magnetic attraction part. When the movable member is located at the first position, the magnetic attraction member is located below the magnetic attraction part, and the magnetic attraction drives the key cap to move away from the base plate via the linkage bracket. In addition, when the movable member moves from the first position to the second position, the magnetic attraction member is away from the magnetic attraction part, the magnetic attraction is reduced to enable the key cap to move towards the base plate. According to the key structure of the invention, the keycap can sink for storage even if the key cap is not subjected to external pressure. Furthermore, the restoring force, namely, the magnetic attraction, of the key cap is not generated by an elastic structure, so that there is no such a problem that an elastic component in the prior art may be permanently deformed and affect the elasticity.

The invention relates to the field of expanded polyethylene, and provides a fireproof expanded polyethylene material. The fireproof expanded polyethylene material aims at solving the problem that theshock absorption and shock resistance of the expanded polyethylene material are easily influenced by adding a flame retardant agent into the expanded polyethylene material, and comprises, by weight, the following components: 30-45 parts of high pressure polyethylene, 10-15 parts of ethylene-vinyl acetate copolymer, 5-10 parts of antimony trioxide, 15-25 parts of decabromodiphenyl ethane, 30-45 parts of aluminum hydroxide, 10-18 parts of azodicarbonamide, 0.2-0.8 part of a crosslinking agent DCP, 0.4-1 part of zinc oxide and 0.1-0.5 part of stearic acid. The invention discloses a preparation method of the fireproof expanded polyethylene material. The method comprises the following steps of: S1, banburying; S2, carrying out open milling; S3, carrying out primary foaming; and S4, carrying outsecondary foaming. Antimony trioxide, decabromodiphenylethane and aluminum hydroxide are mixed according to a certain proportion and are added into the expanded polyethylene as flame retardant agentsto prepare the fireproof expanded polyethylene material, so that the fire resistance of the fireproof expanded polyethylene material is improved, and meanwhile the fireproof expanded polyethylene material has good shock absorption and shock resistance.

The invention belongs to the field of sports equipment, and relates to an adjustable and controllable strength trainer characterized by pulling a weight during half-squat and stand. The strength trainer is characterized in that a shock-reducing rubber blanket is placed on the ground; a weight is placed on a shock-reducing rubber blanket; inner sides of four pulling handles are welded and connected onto the outer side of the lower end of an up-lifting rack; four castors are hinged at the lower end of the up-lifting rack through four shafts respectively and placed on the ground; a first rubber blanket is pasted and connected with the upper middle part of the weight; weight scale values corresponding to the weight are engraved on the up-lifting rack; the lower part of the up-lifting rack is placed on the first rubber blanket; a second rubber blanket is fixedly connected onto the inner upper side of a sliding sleeve through a rivet; the sliding sleeve is buckled on the up-lifting rack; and the two sides of the sliding sleeve are fastened and connected with the weight through four screws. Suitable pulling weight can be found out through moving the up-lifting rack forwards and backwards, so that the problem that the conventional pulling weight is not easy to adjust and control can be solved; when the trainer is used during the process of squat and stand, the muscles of lower limbs are in the state of isotonic contraction; and the pulling handles are arranged at the two ends of the trainer to enable training at either end to be realized conveniently.

The invention relates to a preparation method of enzymolytic rice protein with telomerase protection function, which is characterized by comprising the following steps: 1) pretreating rice by pulverization and filtration, adding water, and stirring uniformly; 2) boiling in a pressure cooker at 60-120 DEG C for 30-60 minutes; 3) cooling to 40-60 DEG C, adding Bacillus subtilis accounting for 0.1-10 wt% of the mixture, fermenting at 40-60 DEG C under the humidity of 50-90% for 24-72 hours, and after the fermentation finishes, taking the fermentation filtrate for later use; 4) putting the fermentation filtrate in an ultrasonic tank, carrying out ultrasonic treatment under the frequency of 5-100 KHz, and adding a compound protein enzyme solution to form an enzymolysis solution; 5) regulating the pH value of the enzymolysis solution to 6.0-8.0, and carrying out enzymolysis at 25-50 DEG C for 60-240 minutes; and 6) inactivating the enzyme at the high temperature of 60-80 DEG C to obtain the enzymolytic rice protein with telomerase protection function. The method has the advantages of low proteinase consumption, high rice protein yield and high small-molecular peptide content; and the obtained rice protein has the effect of increasing the telomere length.

The invention relates to an ignition coil for an internal combustion engine, comprising a housing (2), a coil assembly (3), a connection assembly (4) for connecting the ignition coil, and a coupling device (5) for coupling the ignition coil in a motor block (M), wherein the coupling device (5) is formed at least partially of an electrically conductive plastic composite material and is designed to connect the ignition coil to a motor block (M) in an electrically conductive manner.

The invention discloses a fluffy fiber cotton roll packaging machine, and belongs to the technical field of non-textile machinery. The fluffy fiber cotton roll packaging machine comprises a rack, an actuating mechanism, a screw shaft and a group of pressure claw bars, wherein a group of first pressure claw bar guide rails and a group of second pressure claw bar guide rails are fixed on the rack, a front bearing seat is arranged at the joint center of the group of the first pressure claw bar guide rails, a rear bearing seat is arranged at the joint center of the group of second pressure claw bar guide rails, the actuating mechanism is arranged on the rack, one end of the screw shaft is supported on the front bearing seat, the middle of the screw shaft is supported on the rear bearing seat, the other end of the screw shaft is connected with the actuating mechanism, a connecting rod nut is arranged on the screw shaft in a matched mode, one end of each pressure claw bar is matched with the first pressure claw bar guide rails and further connected with the second pressure claw bar guide rails, the other end of each pressure claw bar extends towards the direction deviated from the rack, each pressure claw bar is connected with one end of each connecting rod in a hinged mode, and the other end of each connecting rod is connected with the connecting rod nut in a hinged mode. The fluffy fiber cotton roll packaging machine has the advantages of being capable of being convenient to transport, saving storage space, relieving operating intensity of workers and ensuring process requirements for follow-up processes such as acupuncture or spunlace.

The invention provides a minced fillet clean production method. The minced fillet production method comprises the following steps of: sequentially sterilizing and cleaning fields and devices, and butchering fresh fish matching national standard; and cleaning and sterilizing fillets, collecting fish, cleaning minced fillet, carrying out fine filtering, dehydrating, packaging, detecting metal, quickly freezing, and storing in a freezing manner, wherein a disinfectant in the fillet sterilizing process is one or random mixture of food-level chlorine dioxide, ozone and sodium hypochlorite. According to the minced fillet clean production method, disclosed by the invention, only one or random two of food-level chlorine dioxide, ozone and sodium hypochlorite are used for sterilizing, thus the total number of microorganism bacteria and the number of escherichia coli in semi-finished products of the minced fillet can be effectively reduced, the safety of the minced fillet is effectively improved, no harmful effect on the gelation, the elasticity and the like of the minced fillet exists, and effective guarantee is provided for the treatment of the minced fillet products; and in addition, by adding a quality improver, the quality of the minced fillet is improved and the retention time of the minced fillet is prolonged.

The invention belongs to the field of sports equipment, and relates to an adjustable and controllable strength trainer characterized by pulling a weight during half-squat and stand. The strength trainer is characterized in that a shock-reducing rubber blanket is placed on the ground; a weight is placed on a shock-reducing rubber blanket; inner sides of four pulling handles are welded and connected onto the outer side of the lower end of an up-lifting rack; four castors are hinged at the lower end of the up-lifting rack through four shafts respectively and placed on the ground; a first rubber blanket is pasted and connected with the upper middle part of the weight; weight scale values corresponding to the weight are engraved on the up-lifting rack; the lower part of the up-lifting rack is placed on the first rubber blanket; a second rubber blanket is fixedly connected onto the inner upper side of a sliding sleeve through a rivet; the sliding sleeve is buckled on the up-lifting rack; and the two sides of the sliding sleeve are fastened and connected with the weight through four screws. Suitable pulling weight can be found out through moving the up-lifting rack forwards and backwards, so that the problem that the conventional pulling weight is not easy to adjust and control can be solved; when the trainer is used during the process of squat and stand, the muscles of lower limbs are in the state of isotonic contraction; and the pulling handles are arranged at the two ends of the trainer to enable training at either end to be realized conveniently.

The invention relates to a key structure. The key structure comprises a bottom plate, a keycap, two supports connected between the bottom plate and the keycap, a first magnetic attraction piece arranged on one support, a movable plate slidably arranged below the bottom plate, and a second magnetic attraction piece corresponding to the first magnetic attraction piece. A magnetic attraction force isgenerated between the first magnetic attraction piece and the second magnetic attraction piece to serve as a restoring force of the keycap. The second magnetic attraction piece can be fixed on the movable plate to be far away from the first magnetic attraction piece along with the movement of the movable plate, so that the magnetic attraction force is reduced for sinking of the keycap, and the key structure can be conveniently stored. The movable plate can comprise a protruding portion which can push one support to rotate towards the bottom plate along with the movable plate, so that the keycap can move towards the bottom plate, and the key structure can be conveniently stored.

The invention discloses a platform for raising frogs with a self-vibrating net, which comprises a floating platform, a vibrating net, a feed hopper and an inclined platform. The vibrating net is horizontally arranged directly above the floating platform. On the edge of the floating platform, a vibrating spring is hung on the lower surface of the vibrating net, and a vibrating ball is hung on the lower end of the vibrating spring; a feed bucket is fixed directly above the middle of the vibrating net through a bracket, and the supporting feet of the bracket are set on the edge of the floating platform. There is a piston baffle at the discharge port, the pulling force of the vibrating net, the sum of the gravity of the pull rope and the piston baffle is balanced with the tension of the pressure spring, and the piston baffle just blocks the discharge port; when the vibrating net vibrates, the piston stops The plate is unbalanced in force, and when it moves upward under the tension of the compression spring, the discharge port is exposed. The present invention raises frogs, and the feed bucket automatically feeds the feed according to the beating of the frogs. The beating of the frogs drives the vibration of the vibrating net, making the bait bounce and jump on the vibrating net, like live bait, which is beneficial to the eating of the frogs, reduces the residue of bait, and vibrates. Net elasticity is adjustable.

A fluffy fiber cotton roll packing machine belongs to the technical field of non-woven machinery. It includes a frame on which a set of first and second pressure claw rod guide rails are fixed, and a front bearing seat is provided at the confluence center of a set of first pressure claw rod guide rails, and a front bearing seat is provided at the confluence center of a group of second pressure claw rod guide rails. It has a rear bearing seat; the power mechanism is set on the frame; one end of the screw shaft is supported on the front bearing seat, the middle part is supported on the rear bearing seat, the other end is connected with the power mechanism, and a connecting rod nut is arranged on the screw shaft a set of claw rods, one end of each claw rod is matched with the guide rail of the first claw rod, and is also connected with the guide rail of the second claw rod, and the other end extends away from the frame, wherein: in each claw rod One end of the connecting rod is hinged on the rod, and the other end of the connecting rod is hinged with the connecting rod nut. Advantages: It can be conveniently transported, saves storage space, and reduces the operating intensity of workers; it guarantees the process requirements of subsequent processes such as acupuncture or spunlace.

A packing device for bulky fiber cotton rolls belongs to the technical field of non-woven machinery. Including the frame, on which a set of first and second pressure claw rod guide rails are fixed; the power mechanism is set on the frame; the screw shaft, one end of the screw shaft is supported on the front bearing seat, and the middle part is supported on the rear bearing seat The other end is connected to the power mechanism, and a connecting rod nut is arranged on the screw shaft. The position of the connecting rod nut on the screw shaft is between the front and rear bearing seats; a set of claw rods, each claw rod One end facing the frame is matched with the first claw rod guide rail, and is also connected with the second claw rod guide rail, and the other end extends toward the direction away from the frame, and one end of the connecting rod is hinged on each claw rod, and the connecting rod The other end of the other end is hinged with the connecting rod nut, and there are at least three claw rods in one group, and the cross-sectional shape of each claw rod is rectangular, circular or triangular. Advantages: convenient transportation, saving storage space, reducing the operating intensity of workers; ensuring the process requirements of acupuncture or spunlace.

The invention relates to a preparation method of enzymatically hydrolyzed rice protein with increased telomere length, which is characterized in that: the following steps are adopted: 1) the rice is pulverized, filtered and pretreated, then added with water and stirred evenly; 2) put in a pressure cooker 60~120 o Cook at a temperature of C for 30~60 min; 3) Cool down to 40~60 o C, adding Bacillus subtilis that accounts for 0.1% to 10% of the mass fraction of the mixture is fermented, and the fermentation temperature is 40 to 60 o C. The fermentation humidity is 50%~90%, and the fermentation time is 24~72 h. After the fermentation, the fermentation filtrate is obtained for use; 4) The fermentation filtrate is placed in an ultrasonic tank for ultrasonic treatment at a frequency of 5~100KHZ, and then Compound protease solution to form enzymatic hydrolysis solution, 5) adjust the pH of the enzymatic hydrolysis solution to 6.0~8.0, and the temperature to 25~50 o C, enzymatic hydrolysis for 60~240 min; 6) After 60~80 min o C high temperature inactivates the enzyme to obtain the enzymatic rice protein with increased telomere length. The invention has low protease usage, high rice protein yield and high small molecular peptide content, and the obtained rice protein has the effect of increasing telomere length.

The invention relates to an ignition coil for an internal combustion engine, comprising a housing (2), a coil assembly (3), a connection assembly (4) for connecting the ignition coil, and a coupling device (5) for coupling the ignition coil in a motor block (M), wherein the coupling device (5) is formed at least partially of an electrically conductive plastic composite material and is designed to connect the ignition coil to a motor block (M) in an electrically conductive manner.

The invention discloses a non-woven fluffy fiber lap packer, and belongs to the technical field of non-woven machinery. The non-woven fluffy fiber lap packer comprises a rack, a power mechanism, a threaded rod shaft and a group of press claw rods. The rack is in a frame-shaped structure. A group of first press claw rod guide rails and a group of second press claw rod guide rails are fixed on the rack. A front bearing seat is arranged in a joint center of the group of first press claw rod guide rails. A rear bearing seat is arranged in a joint center of the group of second press claw rod guide rails. The power mechanism comprises a motor and a reduction gearbox. One end of the threaded rod shaft is supported on the front bearing seat. The middle portion of the threaded rod shaft is supported on the rear bearing seat. The other end of the threaded rod shaft is connected with the reduction gearbox. A connecting rod nut is arranged on the threaded rod shaft in a matching mode. One end of each press claw rod is matched with a first press claw rod guide rail, and is further connected with a second press claw rod guide rail. The other end of each press claw rod extends along a direction away from the rack. One end of a connecting rod is hinged with each press claw rod, and the other end of the connecting rod is hinged with the connecting rod nut. The non-woven fluffy fiber lap packer has the advantages of being convenient to transport, saving storage space, reducing operating intensity of workers, and ensuring technological requirements of needling or spunlace.

The invention discloses an antistatic optical fiber and a manufacturing method thereof, which belong to the field of optical fibers. The optical fiber of the invention comprises a fiber core, a wrapping layer covering the outer surface of the fiber core and at least one coating layer covering the outer surface of the wrapping layer, wherein the coating layer contains an antistatic agent; and the mass of the antistatic agent is 1.1 to 10% of that of the coating layer. The optical fiber of the invention has the beneficial effects that the resistivity of the optical fiber coating layer can be reduced; the electrostatic effects on the surface of the optical fiber can be reduced fundamentally; and performance such as elasticity, strength and water absorption of the coating layer itself is not influenced at all.

The invention discloses a method for preparing reclaimed polyester bottle chip spun fine denier moisture absorption and sweat release full drawn yarn (FDY) polyester filament fibers. The method comprises the following steps of: 1, pre-crystallizing materials which are reclaimed polyester bottle chips by adopting dry hot air; 2, performing screw feeding on the materials, namely feeding the dried reclaimed polyester bottle chips into a screw extruder by electromagnetic vibration; 3, filtering the melt extruded by the extruder, wherein continuous production of spun yarns and constant pressure of the screw extruder are ensured during filtering; and 4, spinning, namely feeding the mixture from a filter into a spinning assembly, jetting fibers from an spinneret plate with five-leaf spinneret holes through the spinning assembly, and then performing drafting, sizing, winding and shaping. The prepared reclaimed polyester bottle chip spun fine denier moisture absorption and sweat release FDY polyester filament fibers have good durability, size stability and good moisture absorption and sweat release functions.

The invention provides an anti-rollover transverse stabilizing device for an automobile. The anti-rollover transverse stabilizing device for the automobile comprises an automobile body; two concave blocks which are fixed at the tail part of the automobile body; and the two anti-rollover devices which are arranged on the outer surfaces of the two concave blocks in a sliding mode correspondingly, and each anti-rollover device comprises a connecting block. According to the anti-rollover transverse stabilizing device for the automobile, by arranging the anti-rollover device, the stability of the automobile during inclination is conveniently improved, the anti-rollover device is limited and supported by arranging the concave block, the anti-rollover device is fixed by arranging the fixing device, and fixing and dismounting are convenient; the anti-rollover devices are driven to move by arranging the telescopic device, so that use is convenient, the anti-rollover device is moved to the tail of the automobile when the anti-rollover device is not used, influences on surrounding automobiles are avoided, the overall attractiveness of the automobile is not affected, and therefore the practicability of the anti-rollover devices is improved.

The invention relates to a preparation and use method of a traditional Chinese medicine facial skin care product, and is characterized in that the traditional Chinese medicine facial skin care product is prepared from the following raw materials in parts: clam shells are crushed to obtain a material I; cutting pigskin into blocks to obtain a material II; mixing and heating water, the material I, the material II and pigeon bones to obtain a material III; filtering the material in the step 3, wherein the filtered liquid is a material 4; drying the filtered solid to obtain a material V; adding soybeans, black beans, red beans and cooked quail eggs into the material IV, boiling, and fishing out the cooked quail eggs; chopping spinach roots, Chinese cabbage roots, broccoli, radish leaves and peony petals, putting the chopped materials into the boiling water in the step 5, and drying the water to obtain a material 6; placing the fifth material, the cooked quail eggs and the sixth material outdoors, and after seven weeks, crushing all the materials into fine powder to obtain a seventh material; crushing Chinese angelica, divaricate saposhnikovia root, hawthorn, bletilla striata, cortex dictamni and borneol into fine powder, and uniformly mixing to obtain a material 8; and uniformly mixing the seventh material, the eighth material and corn flour. The skin care product has the beneficial effect that the skin care product is free of toxic substances.

The invention discloses a key structure, which comprises a bottom plate, a key cap, a lifting mechanism, a moving member, a linkage support and a magnetic suction member. The lifting mechanism is connected with the bottom plate and the key cap. The moving member is arranged in a sliding manner with respect to the bottom plate. The linkage support has a pivot part, a magnetic suction part and a drive part. The magnetic suction member is arranged on the bottom plate and can generate a magnetic suction force with the magnetic suction part. When the moving member is located in a first position, the pivot part can be rotatablely arranged on a protruding bench of the moving member, and the magnetic suction force drives the key cap to move away from the bottom plate through the linkage support; and when the moving member moves from the first position to a second position, the protruding bench is away from the lower position of the pivot part, so that the pivot part breaks away from the protruding bench and moves downward, and the key cap moves towards the bottom plate. According to the key structure, the key cap can still sink for easy storage even when not pressed; and the key cap restoring force is not generated by an elastic structure, so that the problem that elasticity is influenced since the elastic member may be permanently deformed in the prior art does not occur.

The invention relates to the technical field of automobile passive safety and provides a flat tire protection device. The flat tire protection device comprises a gas generation unit, a flat tire linkage unit and an air bag assembly filled with gas to be used for supporting a tire when the tire bursts. The flat tire linkage unit comprises a first cylinder body with an opening formed in one end and a first action piece arranged in the first cylinder body. The first cylinder body is divided by the first action piece into a closed first cavity and a second cavity used for communicating with an inner cavity of the tire. The gas generation unit communicates with the air bag assembly and used for generating gas when the tire bursts and making the air bag assembly filled. The gas generation unit is electrically connected with the flat tire linkage unit. The first action piece is used for controlling a circuit where the gas generation unit and the flat tire linkage unit are located to be on and off. The flat tire protection device is arranged in the inner cavity of the tire, the structure of the tire is not changed at all, and the elasticity of the tire, noise generated in the traveling process, oil consumption, the controllability and the like cannot be adversely affected.