35results about How to "To achieve the purpose of slowing down" patented technology

The invention aims to provide an orthogonal planetary speed reducer transmission device, which overcomes the defects of transmission efficiency and service life in an orthogonal harmonic transmission speed reducer. The orthogonal transmission of a novel motor is realized by a pair of orthogonally engaged bevel gears, a large bevel gear with an eccentric structure drives a dual planetary wheel to rotate, the planetary wheel does circumferential movement around a fixed axis and also does rotary movement around a self axis, the planetary wheel and an inner gear are in the engagement transmission of one pair of gears with small tooth difference, and a sun gear is used as an output mechanism and is simultaneously engaged with the other gear of the planetary gear also in the engagement output of one pair of gears with small tooth difference. The orthogonal planetary speed reducer has the advantages that the speed reduction ratio is large, the size is small, the weight is light, the output torque is large, the transmission precision is high, the transmission efficiency is high, the service life is long, and the like.

The invention relates to the technical field of motor vehicle axles, in particular to a new energy electric axle. The new energy electric axle comprises an axle main shaft, a brake disc is fixedly connected to one side of the axle main shaft, an axle shell is movably connected to the outer surface of the axle main shaft through a bearing, a brake caliper support is fixedly connected to the right end of the side, close to the brake disc, of the axle shell, and two sliding pins are symmetrically and fixedly connected to the upper end and the lower end of the outer surface of the rear end of the brake caliper support. According to the new energy electric axle, a friction mechanism is arranged, and a friction plate and the brake disc make contact with each other, so that the purpose of decelerating a vehicle is achieved; and the vehicle is braked emergently through a front brake pad and a rear brake pad, due to the fact that the front brake pad and the rear brake pad do not make contact with the brake disc when the vehicle is decelerated, the front brake pad and the rear brake pad are protected, the replacement frequency of the front brake pad and the rear brake pad is reduced, the use cost is reduced for a user, and meanwhile the maintenance time of an operator is shortened.

The invention belongs to the technical field of speed reducers, and provides a large-transmission-ratio speed reducing method and device. The large-transmission-ratio speed reducing method achieves speed reduction by constructing a driving gear which revolves around a fixed shaft only but not rotates on own axis, and the method achieves the effect of revolution only but no rotation on the basis ofa parallelogram principle. The device comprises a box body, an input shaft, an output shaft, a first rotating frame and a first transmission set; the input shaft, the output shaft and the first rotating frame are all rotationally arranged on the box body; and the first transmission set is arranged on the first rotating frame, and is used for linkage of the first rotating frame and the output shaft. According to the technical scheme, the problems of simplex transmission ratio and poor structure compactness of a speed reducer in the prior art are solved.

The invention discloses a synchronous pipe body cutting and pushing device. The synchronous pipe body cutting and pushing device comprises a cutting and pushing device main body, wherein a connectingframe is arranged at the bottom of the inner end of the cutting and pushing device main body; a driving part is rotationally connected to the front end of the connecting frame; a pipe body is connected to the front part of the top end of the connecting frame; the driving part comprises a matching ring, a fastening frame, a contact shaft frame, a communicating part, a driven shaft, a transmission frame and a motor; the motor is arranged at the bottom of the inner end of the driving part; the front end of the motor is rotationally connected with the contact shaft frame through the communicatingpart and the transmission frame; the side end of the communicating part is connected with the driven shaft in a sleeved mode; the upper end of the driven shaft is rotationally connected with the fastening frame; and the top end of the fastening frame is fixedly connected with the matching ring. According to the synchronous pipe body cutting and pushing device, the driving part is arranged, so thatthe purpose of integrated connection is achieved.

The invention discloses a servo motor rotor punching sheet manufacturing and forming method which comprises a stamping production structure, the side end position of the stamping production structure is connected with an adjusting feeding structure in a limiting mode, and the stamping production structure comprises a first stamping part, a transmission inclined guide part and a second stamping part. The conveying inclined guide part is arranged at the bottom of the inner end of the stamping production structure, one side of the upper end of the conveying inclined guide part is fixedly connected with the first stamping part, and the other side of the upper end of the conveying inclined guide part is fixedly connected with the second stamping part. According to the manufacturing and forming method for the rotor punching sheet of the servo motor, the purpose of manufacturing and forming the rotor punching sheet of the servo motor at the inner end is achieved through the arrangement of a pressing production structure.

The invention discloses an intelligently controlled coal coking smoke waste heat recovery system. The system comprises a gas guiding tube used for connecting and introducing coal coking smoke, the gas outlet end of the gas guiding tube communicates with a buffer chamber, one end, close to the gas guiding tube, in the buffer chamber is detachably provided with a buffer rack, the buffer rack is provided with a plurality of ceramic buffer balls, the gas outlet end of the buffer chamber communicates with a heat recovery chamber, a coal economizer is arranged in the heat recovery chamber, the water inlet end of the coal economizer traverses through the heat recovery chamber and is externally placed below the heat recover chamber, the water outlet end of the coal economizer traverses through the heat recovery chamber and is externally placed at the top of the heat recovery chamber, and the gas outlet end of the heat recovery chamber is connected with a gas outlet tube; and the system also comprises a controller, a first solenoid valve is arranged between the buffer chamber and the heat recovery chamber, a second solenoid valve is arranged between the heat recovery chamber and the gas outlet tube, a temperature sensor and a pressure sensor are arranged at the middle part of the heat recovery chamber, and the first solenoid valve, the second solenoid valve, the temperature sensor and the pressure sensor are respectively electrically connected with the controller.

The invention relates to the technical field of industrial engineering transportation, and discloses an electromagnetic-damping-principle-based industrial engineering transportation lifting machine protection rotating shaft. The electromagnetic-damping-principle-based industrial engineering transportation lifting machine protection rotating shaft comprises a shell, wherein the front surface of the shell is fixedly connected with a magnetic ring, the inner wall of the middle portion of the magnetic ring is movably connected with a rotating shaft, and electric push rods are fixedly connected with the inner wall of the middle portion of the rotating shaft. According to the electromagnetic-damping-principle-based industrial engineering transportation lifting machine protection rotating shaft, centrifugal blocks are driven to move through the rotating shaft, the centrifugal blocks drive dielectric plates to move, then a speed reduction effect is achieved through cooperative use of reset springs and negative plates, at the moment, a coil is in a completely-closed state, magnetic poles of the coil and the magnetic ring generate motion of cutting magnetic induction lines, due to the fact that magnetic flux penetrated by the coil changes, the coil generates induction current, and a magnetic field generated by the current can hinder relative motion of the rotating shaft, so that the purpose of reducing the speed of the rotating shaft is achieved.

The invention provides a generator which comprises an inner stator, a rotor, a stator magnet, a rotor magnet and a transmission mechanism driving the inner stator magnet to rotate. The rotor is of a cylindrical structure, the rotor is arranged on the outer side of the inner stator in a sleeving mode, the inner stator magnet is rotatably arranged at the edge position of the end face of one end of the inner stator, the rotor magnet is arranged on the end face of one end of the rotor, and the inner stator magnet and the rotor magnet are arranged on the same plane; the rotor is in transmission connection with the inner stator magnet through the transmission mechanism. A rotatable inner stator magnet is arranged on an inner stator, rotation of a rotor drives the inner stator magnet to rotate through a transmission mechanism, and switching of the magnetic field direction of the inner stator magnet is achieved, so that original repulsion between the inner stator magnet and a next rotor magnet is changed into attraction, and rotation of the rotor is promoted under the action of magnetic field attraction. And the magnetic field resistance in the generator is reduced.

The invention discloses an automatic drilling machine with the decelerating function for glass, and particularly relates to the technical field of glass deep processing. The automatic drilling machine comprises a driving disc and a driven disc; a semi-circular rotating part and a pushing part are arranged on the driving disc; a plurality of arc-shaped grooves matched with the rotating part are formed in the driven disc; a pushing groove is formed between every two adjacent arc-shaped grooves; the rotating part can slide in the arc-shaped grooves; and the pushing part can sequentially feed into the corresponding pushing grooves along with the rotation of the driving disc so as to enable the driven disc to rotate. According to the automatic drilling machine, the stress of the glass to be processed can be reduced, and therefore the problem of drilling for the glass can be easily solved, and breakage of the glass in the drilling process can be avoided.

The invention discloses a speed reduction device, a speed reduction system and a speed reduction method. The invention provides the non-pneumatic sample tube speed reduction device, the speed reduction system and the speed reduction method which are used in a pneumatic transmission system and do not need to modify a transmission pipeline. The speed reduction device comprises a first assembly, wherein the first assembly is provided with a through groove for radially limiting a sample tube; a second assembly provided with elastic contact parts, wherein the elastic contact parts and the groove bottom of the through groove are arranged at intervals, and the elastic contact parts and the through groove form a sample channel; and a diameter changing device provided with a moving end, wherein the moving end acts on the first assembly and / or the second assembly so that the drift diameter of the sample channel can have a gradually-decreasing change trend. The speed reduction device, the speed reduction system and the speed reduction method have the advantages of being convenient to implement, relatively simple in control precision requirement and the like.

The invention discloses a space tumbling target non-contact racemization method based on a double-satellite electromagnetic formation satellite. According to the method, two small satellites carrying high-temperature superconducting coils are utilized to form an electromagnetic formation to reach the two sides of a non-cooperative target, and a space controllable magnetic field for enveloping the target is built; and the two service satellites continuously approach to and move away from the target by controlling the magnitude and direction of the current of the satellite-borne coils and the attitude of the formation satellites. The non-contact electromagnetic effect of the target and the coil system is achieved through eddy current torque induced by movement of a conductor on the target relative to a coil magnetic field, the angular momentum of the target is absorbed, and the angular momentum of the service satellite system is consumed at the farthest point through a propellant. The invention aims to solve the problem that capturing is difficult to implement due to complex rolling motion of the non-cooperative target.

The invention provides a self-care bed suitable for aging, and relates to the technical field of daily nursing equipment. The self-care bed suitable for aging comprises a bed body; a lifting mechanism is installed in the center of the bottom of the bed body; supporting mechanisms are installed on the two sides of the bottom of the bed body correspondingly; head and tail handrails are fixedly connected to the two sides of the top of the bed body correspondingly; the outer walls of the two head and tail handrails are sleeved with sponge protection sleeves correspondingly; an automatic back supporting mechanism is installed in the center of one side of the bed body; a center fixing rod at the rear end of the top of the bed body is connected with a protective guard; an air bag massage mechanism is installed in the center of the top of the bed body; and a storage mechanism is installed on one side of the bottom of the bed body in a sliding mode. By designing the lifting mechanism, the supporting mechanism, the automatic back supporting mechanism, the air bag massage mechanism and the storage mechanism, lifting adjustment of the bed body, adjustment of the inclination angle of the supporting back and massage through the air bags can be conducted, bedside storage is facilitated, and therefore the overall working efficiency of the bed is greatly improved, and the bed is worthy of being widely popularized.

The invention relates to a material drying unit. The material drying unit comprises more than two hot air drying areas and more than two cold air drying areas. The hot air drying areas are used for drying materials through hot air. The cold air drying areas are used for drying the materials through cold air. The hot air drying areas and the cold air drying areas are arranged alternatively so as toenable the materials to be dried to pass through the hot air drying areas and the cold air drying areas alternatively. By means of the material drying unit, the materials to be dried alternatively pass through the hot air drying areas and the cold air drying areas; the material temperature of the cold air drying areas is higher than air temperature, and when the materials pass through the cold air drying areas, some moisture of kernels is dissipated through fruit shells; and the material temperature of the hot air drying areas is lower than the air temperature, and when the materials pass through the hot air drying areas, moisture is rapidly dissipated, so that the kernels are effectively dried, and the uniformity of humidity inside and outside the materials is guaranteed.

The invention discloses a municipal pipeline slope transportation device, and relates to the technical field of municipal pipeline transportation. The device comprises a base, a through groove is formed in the base, the other end of a second connecting rod penetrates through a through groove to be hinged to a hinge seat, a first connecting rod is rotationally installed on a clamping seat arranged on one side face of a roller fixing part, and the other end of the first connecting rod is also hinged to the hinge seat; and a roller is rotatably mounted on one roller fixing part, a speed reducing part corresponding to the roller is mounted on the inner side of a vertical plate, and a convex shaft mounted with the speed reducing part is arranged on the roller. According to the municipal pipeline slope transportation device, stop blocks make contact with beads, the beads push the stop blocks to retract into sliding grooves in the rotating process of the rollers in the forward rotating direction, the protruding ends of the stop blocks and the beads extrude and slide friction in the reverse rotating process, the reverse rotating resistance of the rollers is increased, the purpose of speed reduction is achieved, and it is guaranteed that in the slope reverse rotating descending process, speed reduction is achieved, and transportation safety is guaranteed.

The invention provides a pendulum bob descent control device and a working method thereof. The pendulum bob descent control device comprises a descent control device body, wherein the descent controldevice body comprises a shell, a rope winding wheel, a first gear, a first rotating shaft, a transmission device and a pendulum bob part, the first rotating shaft is rotationally connected into the shell, the rope winding wheel and the first gear are arranged on the first rotating shaft, the transmission device is fixedly arranged in the shell, the first gear is connected with the transmission device, one end of the pendulum bob part is rotationally connected with the inner wall of the shell, and a connecting rod is arranged at the end, close to the transmission device, of the pendulum bob part and connected with the transmission device; and a rope enters the rope winding wheel from one end of the shell and extends out of the shell from the other end of the shell. According to the pendulumbob descent control device and the working method thereof, the structure is simple, and a user can automatically adjust braking force according to body weight.

The invention relates to the technical field of lithium battery raw material processing, in particular to a circulating drying device for lithium battery raw material processing. It includes a supporting mechanism, two circulating drying mechanisms arranged on the top of the supporting mechanism, and a feeding mechanism arranged on the top of the circulating drying mechanism. The supporting mechanism includes a base, and the base is arranged at the bottom of the circulating drying mechanism. The circulating drying mechanism includes The heating and drying device includes a heating barrel, a heating cavity is opened inside the heating barrel, and a heating plate is arranged in the heating cavity. In the present invention, the air pump through the air flow generated by the rotation of the blades guides the steam in the heating barrel into the steam cavity through the communication pipe and the bottom plug-in pipe, and further heats the steam cavity through the release of heat from the water vapor, and the water vapor after the heat is released becomes The liquid absorbs the heat transmitted by the inner wall of the steam cover and continues to become water vapor, forming a cyclic heating process, thus solving the problem of water vapor utilization.

The invention discloses a controllable centrifugal drum type high-rise descent control device. A winding wheel is connected with an accelerator mechanism which is connected with a centrifugal drum type brake mechanism, a manual brake mechanism and an automatic descent speed control mechanism are connected onto the centrifugal drum type brake mechanism respectively, and a fireproof steel wire is wound on the winding wheel through a lead hole in a machine frame. The controllable centrifugal drum type high-rise descent control device achieves automatic uniform-speed descent through the accelerator mechanism and the centrifugal drum type brake mechanism, achieves the purpose of slow descent, and is simple and easy to use. A speed regulation knob is controlled manually, a transmission control spring group is tensioned (loosened) so as to increase (reduce) pre-tightening pressure exerted on a brake block, and the purpose of increase (reduction) of automatic descent speed is achieved. A movable handle is controlled, a part of axial force generated by the movable handle is transformed into positive pressure which is perpendicular to a shaft and is exerted on the brake block to form a braking torque so as to achieve that descent can be stopped manually at any time in the descent process, no electric power is needed, the slow descent function is completed through mechanical transmission, and the controllable centrifugal drum type high-rise descent control device is safe and reliable.

The invention relates to a safety elevator capable of effectively avoiding falling into a shaft. The safety elevator comprises the elevator shaft, two fixing mechanisms and a speed reducing mechanism, each fixing mechanism comprises a connecting block, an electromagnet is fixedly installed on the outer surface of each connecting block, four cross rods are fixedly installed in an inner cavity of each connecting block, and four electric telescopic rods are fixedly mounted in an inner cavity of each connecting block. According to the safety elevator capable of effectively avoiding falling into the shaft, the fixing mechanisms are connected to the left side and the right side of an elevator body through connecting columns, when the elevator decelerates to a certain speed and moves to fixing grooves formed in the front surface and the rear surface of a vertical plate, the fixing mechanisms work, two fixing plates in the fixing mechanisms move out of inner cavities of the fixing mechanisms and are inserted into the fixing grooves, springs play a role of buffering, when the fixing plates and buffer blocks move to the groove bottoms of the fixing grooves, due to limiting of the fixing grooves, the elevator body cannot continue to move downwards, and meanwhile, the electromagnet and the vertical plate attract each other, so that the auxiliary fixing effect is achieved.

The invention relates to the technical field of lithium battery raw material processing, in particular to a circulating drying device for lithium battery raw material processing. The circulating drying device for lithium battery raw material processing comprises a supporting mechanism, two circulating drying mechanisms arranged at the top of the supporting mechanism, and a feeding mechanism arranged at the tops of the circulating drying mechanisms, wherein the supporting mechanism comprises a base; the base is arranged at the bottoms of the circulating drying mechanisms; each circulating drying mechanism comprises a heating drying device; each heating drying device comprises a heating barrel; a heating cavity is formed in each heating barrel; and a heating plate is arranged in each heatingcavity. According to the circulating drying device for lithium battery raw material processing provided by the invention, an air pump guides steam in the heating barrel into a steam cavity through cooperation of a communicating pipe and a bottom inserting pipe through airflow generated by rotation of blades, the steam cavity is further heated through heat released by the steam, the steam with theheat released becomes liquid, and the liquid absorbs heat transmitted by the inner wall of a steam hood so as to be continuously changed into steam to form a cyclic heating process, so that the problem of steam utilization is solved.

A rotating mechanism disclosed by the present invention comprises a first rotor, a first stator and a circuit, the first stator is provided with a first electromagnet, and the first rotor is provided with a first magnet and a second magnet which are arranged at an interval. The magnetic pole of the end face, facing the first electromagnet, of the first magnet is opposite to the magnetic pole of the end face, facing the first electromagnet, of the second magnet, the circuit comprises a power source, a PLC and a coil of the first electromagnet, the power source, the PLC and the coil of the first electromagnet are electrically connected in sequence and form a loop, and the PLC is connected with a bipolar latch type Hall effect sensor. The direction of the coil input on the electromagnet is continuously changed through the bipolar latch type Hall effect sensor, so that the magnetic poles on the two end faces of the electromagnet are continuously changed, a plurality of permanent magnets arranged on the rotor are attracted and repelled, the rotor is driven to rotate, a speed reducer is not needed in the aspect of controlling the rotating speed of the rotor, and the purpose of speed reduction can be achieved only by adjusting the magnetic energy of the permanent magnets by adjusting the types of the permanent magnets.

The invention discloses a high-rise emergency escape slow descent control device for a smart city and a use method of the high-rise emergency escape slow descent control device, and particularly relates to the field of smart cities. The high-rise emergency escape slow descent control device comprises a balance weight stabilizing seat and supporting side plates, wherein pay-off guide wheels, the supporting side plates and a working machine case are fixedly installed on the top surface of the balance weight stabilizing seat; and rotary crankshafts are rotatably mounted in the working machine case, cable winding rollers fixedly sleeve the outer sides of the rotary crankshafts, a bearing seat is fixedly mounted on the inner side of each supporting side plate, the ends of the rotary crankshaftsrotatably sleeve the bearing seats, and a hydraulic slow descent mechanism is fixedly mounted in the working machine case. According to the high-rise emergency escape slow descent control device, byarranging a hydraulic slow descent structure, partial rotating mechanical kinetic energy of a reel is consumed through flow limiting movement of hydraulic oil liquid in the hydraulic slow descent mechanism and a hydraulic adjusting mechanism, so that the slow descent purpose is achieved, the hydraulic slow descent mode is more stable compared with friction speed reduction, and the safety of slow descent escape is greatly improved.

The invention provides a double-hydraulic-cylinder descent control device and a working method thereof. The double-hydraulic-cylinder descent control device comprises a descent control device body anda rope, the descent control device body comprises a shell, a rope winding wheel, a rotating shaft, a transmission mechanism and buffer hydraulic cylinders, the rotating shaft is rotationally connected with the inner wall of the shell, the rope winding wheel is arranged on the rotating shaft, and the transmission mechanism is arranged at one side of the rope winding wheel and connected with the rotating shaft; and two buffer hydraulic cylinders are arranged, one end of each buffer hydraulic cylinder is fixedly connected with a transmission device, and the other end of each buffer hydraulic cylinder is connected with the inner wall of the shell. The double-hydraulic-cylinder descent control device has the advantage that the braking force can be automatically adjusted according to the weightof a user.

The invention belongs to the technical field of recreation facility safety, and relates to a driving, speed reducing and braking three-in-one device for a pirate ship. The device comprises a base, a swing support arranged on the base, and a driving wheel and a driving motor which are arranged on the swing support, the front end of the swing support is hinged to a connecting rod, a pressure spring seat, a hydraulic pusher and a supporting rod are fixed to the front end of the base, the upper end of the pressure spring seat is movably connected to a sleeve, a pressure spring is arranged between the pressure spring seat and the sleeve in a sleeved mode, the upper end of the sleeve is hinged to the lower portion of the swing support, the upper end of the supporting rod is movably connected to an adjusting rod, the upper end of the adjusting rod is hinged to the middle of a connecting rod, and the upper end of the hydraulic pusher is hinged to the front end of the connecting rod; and a brake and a brake wheel are arranged on one side of the driving wheel in a matched mode. The hydraulic pusher is controlled to stretch out and draw back, and the swing support is lowered or raised, so that the driving wheel makes intermittent contact with the bottom of a cockpit of the pirate ship, and the purposes of acceleration, deceleration swing and braking of the ship body are achieved.

The invention discloses a self-protection and hazard remedy device after out-of-control falling of an electric unmanned aerial vehicle. The device comprises the unmanned aerial vehicle, a power device and a speed reduction device, the power device is fixedly installed at the lower end of the unmanned aerial vehicle, and the speed reduction device is fixedly installed at the lower end of the power device. According to the invention, a modularly designed suction pressurization device and a pop-up type speed reduction device are adopted, the device can be flexibly installed below the unmanned aerial vehicle, after the unmanned aerial vehicle is out of control, an air storage tank is pressurized, a parachute is popped out through air pressure, the purpose of decelerating landing of the unmanned aerial vehicle is achieved, and the unmanned aerial vehicle is prevented from being directly crashed and damaged; trumpet-shaped exhaust hoods are arranged in the air suction pressurization device, air in the air storage tank is discharged in a directional mode through the trumpet-shaped exhaust hoods designed in an arc shape, the air outlet amount of the two trumpet-shaped exhaust hoods is controlled through an adjusting valve, the landing direction and speed of the unmanned aerial vehicle can be changed, the unmanned aerial vehicle is pushed to move towards the roadside open space after the parachute is opened, and the unmanned aerial vehicle is prevented from falling on the road to cause traffic accidents.

The invention discloses a sponge urbanization deceleration strip which comprises a soft shell, a first telescopic column, a connecting piece, a second telescopic column, a pressure sensor and a controller. An inner top wall of the soft shell is connected with a top end of the connecting piece, a bottom end of the connecting piece is connected with the top of the first telescopic column, and the pressure sensor is attached to the top of the first telescopic column; one part of the first telescopic column is arranged in the second telescopic column, telescopic states of the first telescopic column and the second telescopic column are controlled by an air cylinder, the controller is electrically connected with the air cylinder, and the pressure sensor is in signal connection with the controller; and the controller is used for receiving signals of the pressure sensor and controlling the working state of the air cylinder. In the invention, a purpose of speed reduction is achieved, jolt of the deceleration strip to a vehicle is reduced, and pressure of a vehicle damping mechanism is decreased.

The invention belongs to the technical field of reducers, and proposes a large transmission ratio deceleration method and device, including a method for realizing deceleration by constructing a driving gear that only revolves around a fixed shaft and does not rotate itself, and includes a method based on the principle of parallelogram to form The method for the effect of only revolution without rotation also includes the box; the input shaft, the input shaft is rotatably set on the box; the output shaft, the output shaft is rotatably set on the box; the first turret, the first turret is rotatably set on the box On the body: the first transmission group, the first transmission group is arranged on the first turret, and the first transmission group is used to link the first turret and the output shaft. Through the above technical solution, the problems of single transmission ratio and uncompact structure of the reducer in the prior art are solved.

The invention relates to a wearable landing protection device. The device comprises a wearable unit, a parachute pack and an inflating device, wherein the wearable unit comprises a platy mounting layer, the mounting layer can also be of any other fixing structure, a strap assembly is mounted on one side of the mounting layer, the strap assembly comprises a pair of shoulder straps, and a waistbandis mounted between the shoulder straps; the waistband comprises two sections which are connected through an inserting buckle or connected in a crossed mode, and the umbrella bag and the inflation device are both arranged on the other side of the installation layer; a user is fixed to the back through the strap assembly, and when the protection device is not started, the parachute pack is in a contracted state. The intelligent control device is arranged on the front side of the waistband, an acceleration sensor is arranged in the intelligent control device, whether the protection device is in aweightless state or not is judged through the acceleration sensor, when the protection device is in the weightless state, the intelligent control device sends out a starting signal, and the inflationdevice receives the starting signal and releases gas, so the umbrella bag is unfolded; therefore, the landing speed is slowed down.