249results about How to "Defy gravity" patented technology

The invention relates to a wall-cleaning robot based on the positive and negative pressure absorption principle. The wall-cleaning robot of the invention solves the problems of complicated structure, bad wall absorption effect, and bad obstacle-crossing capacity and so on, existing in the existing wall-cleaning robot. A cleaning mechanism (71) and a water inlet and outlet mechanism of the invention are installed in a shell body (2); a wheel type traveling system (70) is installed at the lower part of the shell body (2); a three-phase motor (13) is installed on the upper end face of the shell body (2); the outer rotors of the three-phase motor (13) are respectively and fixedly provided with a propeller (1) and a centrifugal fan in sequence from top to bottom; the external housing of the three-phase motor (13) is communicated with the inner cavity of the shell body (2); a dry brush (9), a wet brush (27), a suction roll (32) and a squeeze roll (44) are installed in the shell body in sequence from front to rear. The wall-cleaning robot of the invention has the advantages of good wall absorption effect, better obstacle-crossing capacity and simple structure and can be remotely controlled.

The invention provides a cutting machine in an underwater pipeline, which mainly comprises a tank type framework (1), a support device (2), a radial feeding device (3), a cutting device (4) and an underwater hydraulic control valve box and detection system (5), wherein driving parts of the support device (2) and the cutting device (4) and part of the underwater hydraulic control valve box and detection system (5) are mounted in the tank type framework (1), and the radial feeding device (3) is connected with the tank by the driving part of the cutting device (4). The invention has the advantages of reasonable structural design, and is convenient to operate, and can meet special requirements for cutting in underwater working environment and in steel pipes. The invention is used for cutting major-diameter steel pipes of offshore oil platform jackets, pile foundations and other underwater pipelines of which external cutting is restricted.

The invention discloses a composite-wing vertical take-off and landing aircraft which adopts a special vertical power unit and an integral structure design. According to the scheme provided by the invention, compared with the prior art, the composite-wing vertical take-off and landing aircraft has the advantages that a maximum yaw control moment of the aircraft is largely improved, negative influence of yaw control saturation on aircraft posture control is avoided, and the robustness of the aircraft is improved; furthermore, the technical scheme of a tail boom is beneficial to improvement of the whole performance of the aircraft.

The invention discloses a composite-wing vertical take-off and landing unmanned aerial vehicle. A conventional fixed-wing aerodynamic layout is adopted to be combined with an X-shaped four-axis layout, and the aerial vehicle states such as vertical take-off and landing, hovering and high-speed cruising are achieved. The yaw control moment is increased through a variable-pitch propeller installed on a vertical tail and a four-axis motor which is installed on a wing and has a tilt angle, and the robustness and the control precision of the large-rotational-inertia composite-wing unmanned aerial vehicle in the low-speed flying state.

The invention discloses a back-flow preventer valve in a pipeline. The back-flow preventer valve in the pipeline comprises a pipe body and valves, wherein the valves are arranged in a pipe cavity. Two valves are designed in the pipe cavity, the width of the middle parts of the valves is greater than the radius of the pipe cavity, and is 1.5-2.5 times the radius of the pipe cavity; the root parts of the valves are thicker than other parts, are arc-shaped and connected with the inner wall of the pipe cavity; free edges of the upper valve and the lower valve face towards the flow direction of the fluid; the valves are light films with elasticity and toughness; and the pipe body is transparent, and the two valves are provided with different colors. The back-flow preventer valve in the pipeline has the advantages that: 1, the two valves are simple and practical, satisfy biomechanics, and can be arranged at a plurality of positions in the same pipe body; 2, down-flow is not affected when the back-flow is prevented; 3, convection of liquid and gas in a drainage pipeline is prevented; and 4, the structure of the pipeline is not affected when the back-flow preventer valve is widely applied to any part of various pipe cavities and pipelines in medical science or non-medical life.

The invention discloses a bag making machine hot-sealing and hot-pressing mechanism capable of working stably. The mechanism comprises a fixing frame body, two guide sleeves, pull rods, a cutter fixing frame and a hot-sealing cutter. The upper ends of the pull rods are fixedly connected to the two ends of the cutter fixing frame respectively and each provided with an upper end abutting portion. The side wall of the upper portion of each pull rod is sleeved with a compression spring. The upper end and the lower end of each compression spring are connected to the corresponding upper end abutting portion and the top of the corresponding sleeve respectively in an abutting mode. At least one pull rod penetrates through the corresponding guide sleeve and then is in transmission connection with an intermittent motion mechanism. According to the bag making machine hot-sealing and hot-pressing mechanism, it can be ensured that the hot-sealing and hot-pressing positions and motion strengths of the hot-sealing cutter for air bubble films or pearl wool films under the hot-sealing and hot-pressing cutter are consistent all the time, and the hot-sealing cutter will not shift even if hot-sealing and hot-pressing are frequently and constantly carried out; accordingly, the working efficiency of the bag making machine hot-sealing and hot-pressing mechanism is greatly improved, and the service life of the bag making machine hot-sealing and hot-pressing mechanism is greatly prolonged.

A bag machine with an improved structure comprises a convey assembly, a feed assembly, and a hot-sealing hot-pressing mechanism; the hot-sealing hot-pressing mechanism comprises a fixed rack, two guide sleeves, pull rods, a cutter fixing rack and a hot-sealing cutter; tops of each pull rod are respectively fixed on two ends of the cutter fixing rack; each pull rod is provided with a top abut portion; an upper side wall of each pull rod is sleeved by a compression spring; at least one pull rod penetrates the corresponding guide sleeve and is in transmission connection with an intermittence motion mechanism, wherein the intermittence motion mechanism is used for controlling the cutter fixing rack to complete up-down mobile motions in cycle in a fixed time. The bag machine can ensure the hot-sealing cutter to carry out hot-sealing hot-pressing for right blow bubble films or pearl cotton films with consistent positions and motion forces in each time; even under frequent continuously hot-sealing hot-pressing, no hot-sealing cutter offset condition is generated, thus greatly improving work efficiency and life of the bag machine.

The invention provides an automatic tree obstacle removing robot based on image recognition and a use method thereof. The robot comprises a mechanical structure and a control system, wherein the mechanical structure comprises a holding mechanism used for encircling and holding a tree trunk, the holding mechanism is arranged on a climbing and posture adjustment mechanism used for climbing the treetrunk and supporting the entire mechanical structure, the holding mechanism is provided with a fall prevention mechanism used for preventing the robot from falling, and the climbing and posture adjustment mechanism is fixedly provided with a pruning mechanism used for pruning and removing tree obstacles; the control system comprises a sensing and detection subsystem, a communication transmission subsystem, a motion control subsystem, a power supply subsystem and a remote control operation subsystem. The robot can avoid the problems such as unsafety and incomplete obstacle clearance which are caused by artificial climbing, and greatly improve the work efficiency of the electric power sector.

The invention relates to the field of plate processing and particularly discloses a plate bending device. The device comprises a frame, a pressing hydraulic cylinder, a cutting mechanism, a workbench,a punch and a punching hydraulic cylinder, wherein a punching channel is arranged in the workbench; a fixing seat is fixed on a push rod of the pressing hydraulic cylinder; the cutting mechanism comprises a rotating shaft, a rotating disk, a motor, a collecting box and pressing blocks; the rotating shaft penetrates through the pressing block; a discharge hole is formed in the collecting box; a filter screen is fixed in the collecting box; a cavity communicated with the collecting box is arranged in the rotating shaft; sliding cavities are arranged in the pressing block; pistons are arranged in the sliding cavities; piston rods are fixed on the pistons; cams are fixed on the rotating shaft; first springs are arranged in the sliding cavities; air inlet check valves and air outlet check valves are fixed on side walls of the sliding cavities; sliding-out grooves are arranged in the rotating disk; second springs and polishing pieces are arranged in the sliding-out grooves; and suction holes are formed in two sides of the rotating disk. According to the scheme, the device has the advantages that chips generated by cutting can be cleaned in time and scratches on plates are avoided.

The invention belongs to the technical field of nuclear reactor reactivity control and particularly relates to a nuclear reactor reactivity control mechanism which comprises a safety rod assembly arranged in a core of a nuclear reactor and capable of going in or out of the core through reciprocating motion, wherein a core lattice for mounting a fuel assembly is arranged in the core. The nuclear reactor reactivity control mechanism further comprises a plurality of cylindrical and rotatable control rod assemblies arranged in the annular reflecting layer on the outer side of the reactor core, andstarting, power regulation and shutdown protection of the nuclear reactor are achieved by adjusting the angle facing the fuel assemblies of an inner neutron reflecting layer or neutron absorber on the control rod assemblies. On the premise of meeting the requirements for reactor design independence and redundancy of nuclear safety regulation, the nuclear reactor reactivity control mechanism has the advantages of being simple, reliable in function, compact in structure and making control rods rapidly drop without relying solely on gravity and the like; the possibility of common cause faults and common failure of multiple control mechanisms does not exist, and the safety of the nuclear reactor is greatly improved.

The invention discloses a magnetic levitation pipe transportation system. The magnetic levitation pipe transportation system comprises a linear motor, a walking mechanism (4), a train (8) and wheel rails (5), wherein the linear motor comprises a primary linear motor (2) and a secondary linear motor (3); the primary linear motor (2) is fixed on the top of a tunnel (1) for magnetic levitation pipes;the secondary linear motor 93) is fixed on the top of the train (8) and is used for driving the train (8) to run; the walking mechanism (4) comprises wheels; the walking mechanism (4) is arranged above or below the train (8); and the wheel rails (5) are arranged below the walking mechanism (4), and are in contact with the wheels of the train (8) when the train (8) is static and runs at a speed lower than set speed so as to support the train (8). By the scheme, requirements for suspension force can be reduced, thus, the weights of magnets are reduced, the magnets are saved, and the weight of the train is reduced.

The invention discloses a micro fixed-wing aircraft capable of hovering. The micro fixed-wing aircraft comprises an aircraft body as well as two horizontal rudder surfaces, two vertical tails, even sets of motors and propellers which are symmetrically arranged on the axle wire of the aircraft body; the motors are connected with the propellers and then are arranged at the head of the aircraft body; the two horizontal rudder surfaces are hinged to the tail of the aircraft body through hinges; the two vertical tails are vertically arranged on two sides of the tail of the aircraft body and are protruded relative to the upper surface and the lower surface of the aircraft body; a flight control system is arranged inside the aircraft body. The direction of the aircraft disclosed by the invention is controllable in a three-dimensional space at a vertical take-off, a landing and a hovering stage; under the control of assisted augmentation of the flight control system, flight motion of the aircraft in the three-dimensional space can be realized. With a wing-body integrated structure and a thin-wall aircraft body, substantial reduction of the size of the aircraft body can be realized; the aircraft disclosed by the invention has the advantages of convenience in carrying and use, small structure and conservation of manufacturing materials.

The invention relates to a throwing lever anti-collision device, and belongs to the technical field of gates. The throwing lever anti-collision device comprises a chuck, a clamping block, a spring, a balance shaft, a position sensor and a guiding frame. The hollow chuck with an opening in the side wall is connected with a main shaft of a gate. The clamping block is contained in the chuck and connected to one side of the chuck in a pivoted manner. One end of the spring used for pushing the clamping block to rotate is connected to the clamping block in a pivoted manner, and the other end of the spring is connected with the chuck in a pivoted manner. The balance shaft is fixedly installed on the clamping block, one end of the balance shaft abuts against or is far away from one side of the chuck, and the other end of the balance shaft is connected with a throwing lever after extending out of the other side of the chuck. The position sensor is connected with a control unit of the gate and used for detecting the rotation position of the balance shaft. The guiding frame is installed on a gate crate and provided with an inclined rail used for supporting and guiding the throwing lever to move upwards. Compared with the prior art, the throwing lever anti-collision device has the following beneficial effects that the throwing lever can be prevented from being crashed, and the throwing lever can automatically reset after avoiding vehicles.

The invention discloses an energy-saving automobile. The energy-saving automobile comprises a shell. The shell comprises an outer shell body and an inner shell body, wherein a fluid channel is arranged between the outer shell body and the inner shell body, a plurality of leading-in openings are formed in the outer shell body, a leading-out opening is formed in the rear portion of the outer shell body, and the fluid channel is communicated with the leading-in openings and the leading-out opening. At least one of the bottom of the outer shell body and the upper portion of the inner shell body is provided with a flow disturbing face for lengthening fluid passing route or a flow disturbing plat for lengthening the fluid passing route, and therefore lifting force is generated by the inner shell body and eliminated by the outer shell body when the automobile is driven. The energy-saving automobile has the advantages that the route of fluid passing by the arc surface of the upper portion of the inner shell body of the automobile is longer than the route of fluid passing by the lower portion of the inner shell body so that the lifting force can be generated, and the route of fluid passing by the lower portion of the outer shell body of the automobile is longer than the route of fluid passing by the upper portion of the outer shell body so that the lifting force can be eliminated; the inner shell body is in a suspended state, and therefore the weight is lowered when the automobile is driven, and energy is saved; the ground attaching force of the automobile is evenly increased through the outer shell body by eliminating the lifting force, and the automobile can be more safely driven.

The invention relates to a bearing lifting appliance, in particular to a lifting appliance for lifting a bearing with inseparable inner and outer rings. The lifting appliance comprises two semicircular hoops for clamping the bearing; the radii of the two semicircular hoops are less than the radius of the outer ring of the bearing; one ends of the two semicircular hoops are hinged by a hinge pin; the other ends of the two semicircular hoops are connected by a bolt; three lifting points are uniformly arranged on the outer peripheral surfaces of the two semicircular hoops; ring-shaped copper plates are embedded on the inner peripheral surfaces of the two semicircular hoops for protecting the bearing from being damaged; and ball lifting bolts capable of being sunk into a bearing oil groove are uniformly arranged on the semicircular hoops and are used for carrying out lifting protection. According to the bearing lifting appliance, the two semicircular hoops are adopted; the rapid and convenient clamping of the lifting appliance is implemented and the labor intensity is reduced. The ring-shaped copper plates are embedded in the two semicircular hoops, so that a steel plate in the lifting appliance is avoided being directly contacted with the bearing and the bearing is effectively protected. According to the bearing lifting appliance, the outer ring of the bearing is directly suspended by a friction force generated by surrounding the outer ring of the bearing, so that the interference of the lifting appliance to the assembly of the inner ring of the bearing is avoided.

The invention belongs to the field of flowerpot carrying devices for potted plants, and particularly discloses a trolley for transporting honeysuckle potted plants. The trolley comprises an underframe, a clamping device and handles. A rotating shaft is arranged below the underframe, and rotating wheels are arranged at the two ends of the rotating shaft. The clamping device comprises two clamping arms with the front ends being provided with circular arcs, elastic pieces are arranged on the inner sides of the clamping arms, and clamping supports making contact with the ground are arranged below the clamping arms. The two clamping arms are hinged to the underframe after being crossed, and the hinged point is a crossed point of the clamping arms. The number of the handles is two, and the two handles are connected to the two clamping arms respectively. A rope is arranged between the two handles, and a tensioner is arranged on the rope. The trolley for transporting honeysuckle potted plants is capable of saving labor and high in efficiency.

The invention relates to manufacture of large panels, strips, sectional bars and the like in ferrous metallurgy industry, in particular to a method for automatically detecting and controlling a segment roll gap by adopting a balancing oil cylinder, which is characterized by at least comprising a lower frame with a guide roll, an upper frame with a guide roll, a hold down roll device for driving a dummy bar and a casting blank, balancing oil cylinders used for roll gap detection and control, and a clamp oil cylinder for connecting the upper frame and the lower frame and keeping the roll gap, wherein the hold down roll device is fixed in the upper central position of the upper frame, and the balancing oil cylinders are evenly distributed between the upper frame and the lower frame, so that a plate blank continuous casting machine dynamically and lightly presses the solidified end of the casting blank in the production process of pouring steel, the quality defects of center segregation, rarefaction and the like of the casting blank can be effectively avoided, and the steel quality and the metal yield are improved.

The invention provides a refrigerator which comprises a storage compartment, a first door body and a second door body. The refrigerator further comprises a vertical beam, a first guide device and a second guide device. The vertical beam is rotationally installed on the inner side of the opening end of the first door body. The first guide device comprises a guide groove formed in the inner side of the top wall of the storage compartment and a guide piece telescopically arranged at the top end of the vertical beam, and the guide piece is configured in the mode that when the first door body is opened, the guide piece is inserted into the guide groove to guide the vertical beam to rotate, after the first door body is opened, the guide piece retracts into the vertical beam, and after the first door body is closed, the guide piece stretches out of the vertical beam. The second guide device comprises an arc guide part formed on the rear side of the top of the vertical beam and an arc baffle which is arranged behind the guide groove and stretches downwards from the inner side of the top wall of the storage compartment, so that when the first door body is closed, the vertical beam is guided to rotate, after the first door body is closed, the guide piece is made to be located under the guide groove, and thus the guide piece stretches out of the vertical beam. According to the refrigerator, the first door body can still be normally closed when the vertical beam is in the complete spreading state or an intermediate state.

The invention mainly relates to the field of fitness devices, and discloses a comprehensive limb strength exercise device. The device comprises a bottom frame, two leg strength exercise devices, and an upper-limb strength exercise device, wherein each leg strength exercise device comprises a pedal and a plurality of tension springs; the upper-limb strength exercise device comprises an A-shaped support, a device box, and two-arm pressing rods; weight placement boxes are arranged in the device box; weight blocks are arranged in the weight placement boxes; stay cords are connected onto the weightplacement boxes; and the other end of each stay cord penetrates the top end of the device box and is connected with the top end of the corresponding two-arm pressing rod. The device provided by the invention has the beneficial effects of low cost and small occupied space, and is a fitness device for simultaneous muscle fitness training of the limbs.

The invention relates to the field of ships, in particular to a pressure balance type floating body and a mounting method thereof. The floating body comprises water chambers, air chambers, air chamber inflation valves, a submersed pressure balancing control system, water chamber water passing systems and water chamber ventilation systems, wherein the interior of the floating body is divided into the water chambers and the air chambers. The center of buoyancy of the floating body and the gravity center of the floating body are in the same vertical line, and the center of buoyancy of the floating body is higher than the gravity center of the floating body. One air chamber inflation valve is arranged on each air chamber, and is connected with the submersed pressure balancing control system. One water chamber water passing system and one water chamber ventilation system are arranged on each water tank. The mounting method comprises the following steps: filling water into all the water chambers, lowering a main body of the floating body into the water and soaking the main body in the water, towing the main body of the floating body downwards, controlling the air pressure in each air chamber and external water pressure to be consistent, filling air in all the water chambers, and draining water in the water chambers to supply upward positive buoyancy. The pressure balance type floating body and the mounting method thereof have the advantages that the floating body can arrive at the working water area at one step, so that a large amount of manpower and physical resources are saved.

The invention provides a slant-bed twin-spindle and double-row-tool numerical control machine tool capable of realizing docking processing of spindles. The slant-bed twin-spindle and double-row-tool numerical control machine tool comprises a slant bed body, left and right Z-axis spindles, left and right X-axis saddles of an integrated structure, left and right X-direction sliding plates, left andright X-axis driving motors of the sliding plates, left and right Z-axis motorized spindles, and left and right Z-axis driving motors for driving the motorized spindles and left and right Z-axis headstocks, wherein left and right Y-axis power heads are arranged on the left and right X-direction sliding plates in a matching manner and are driven by Y-axis driving motors to displace along Y axis. The slant-bed twin-spindle and double-row-tool numerical control machine tool provided by the invention has the advantages that the structure is compact; the space of the machine tool is saved; application modes are flexible and diversified; double channel synchronous processing can be realized; docking surface exchange turn-around processing of the double spindles also can be realized; side processing is realized continuously without detaching work pieces; manual intervening operation is reduced; the yield is improved; processing precision is ensured.

The invention relates to the technical field of ships and particularly relates to an underwater floating body and an installing method thereof. The floating body comprises divided cabins and pressure-resistant cabins, wherein the left side and the right side of the floating body are symmetrically provided with the divided cabins; the front side and the rear side of the floating body are respectively provided with the divided cabin; the buoyancy provided by the divided cabin at the front side of the floating body is larger than that provided by the divided cabin at the rear side of the floating body or the buoyancy provided by the divided cabin at the rear side of the floating body is larger than that provided by the divided cabin at the front side of the floating body. The pressure-resistant cabins penetrate through the divided cabins and are fixedly connected with the cabin walls of the divided cabins. The floating center of the floating body and the gravity center of the floating body are in the same vertical line, and the position of the floating center of the floating body is higher than the position of the gravity center of the floating body. The pressure-resistant cabins are provided with inflation valves, and the divided cabins are provided with venting systems and water introducing systems. The installing method comprises the steps of: inflating the pressure-resistant cabins and filling water into the divided cabins; falling the underwater floating body down to a working water area; inflating air into the divided cabins to discharge a part of water in the divided cabins, and enabling the divided cabin to generate upward buoyancy. According to the underwater floating body and the installing method provided by the invention, the working water area can be reached by one time, so that a great amount of labor and materials is saved.

The invention relates to an automatic oiling machine, and belongs to the technical field of vibration absorbers of locomotive vehicles. The automatic oiling machine comprises a positioning tool for fixing a speed reducer, wherein an oil tank and three-dimensional oiling arms driven by corresponding servo motors respectively are arranged on an oil tank frame above the positioning tool, and an end oil filler pipe is arranged on each three-dimensional oiling arm; and an oil outlet of the oil tank is connected to the oil filler pipe through a three-way solenoid valve. Compared with the prior art, the automatic oiling machine has the advantages that: instructions can be inputted through a human-computer interface, the three-dimensional oiling arms coordinatively move and oil-supply systems are mutually matched, so that the oiling machine can be positioned accurately according to requirements, and hydraulic oil is accurately injected into the vibration absorbers with different specifications to avoid a series of troubles of modifying programs, replacing a positioning base, adjusting the oiling position and the like so as to truly realize automation control, save manpower resources, improve work efficiency and ensure oiling quality.

The invention discloses an obliquely arranged solar cell cleaning system device and an operating method thereof. A solar cell is provided with guide rails and ca a sliding bar, a water spray device, an air injection device, a wiping device and an ultrasonic cleaning device, wherein the sliding bar is slidably connected with the guide rails and provided with a clamping groove; the water spray device is connected with the clamping groove; the air injection device is used for driving the water spray device to move; the water spray device is connected with the air injection device through an arc-shaped cover with a partition board in the middle; the lower end of the solar cell is provided with a baffle used for preventing the water spray device from continuing sliding downwards; water flow forms vortex in the cover. Meanwhile, through combination with the ultrasonic cleaning device, the obliquely arranged solar cell cleaning system device can achieve the better cleaning effect. The obliquely arranged solar cell cleaning system device implements washing, rotating and vibration, and the overall cleaning effect is better. The obliquely arranged solar cell cleaning system device is reasonable in design, simple in structure, beneficial to enhancing the absorbing capacity of the solar cell to sunlight, improving the working efficiency of the solar cell panel and prolonging the service life of the solar cell panel.

The invention belongs to the technical field of remote control unmanned submersibles and provides a hybrid control underwater control device which can flexibly control buoyancy to adapt to different environments and work tasks and can reduce energy consumption in the working process. An oil sac and propeller hybrid control ROV underwater hovering and definite depth control device is composed of acontrol box, a umbilical cable, an ROV control system, an ROV sealing pressure resistance shell, a larboard vertical propeller, a starboard vertical propeller, a bow oil sac type buoyancy adjusting device and a stern oil sac type buoyancy adjusting device. The control box is connected with the ROV control system through the umbilical cable. The ROV control system arranged in the ROV sealing pressure resistance shell is composed of an attitude control module, a propeller drive module and a buoyancy adjusting device drive module, wherein the attitude control module is composed of a system control module, a depth sensor, a three-axis acceleration sensor, a three-axis gyroscope and a three-axis magnetometer. The device is mainly applied to unmanned submersible design and manufacture occasions.

The invention relates to the technical field of small household appliances, more particularly to a soybean milk machine adopting magnetic levitation control technology. The soybean milk machine comprises three parts, i.e. an upper cover, an inner cavity and a base, wherein a levitating electric magnet is fixed inside the base and right below a rotor, a coil of the levitating electric magnet is connected to a controller, a magnetic force device is fixed at the lower part of the rotor; the inner cavity is internally fixed with a rotating electric magnet simultaneously, the rotating electric magnet is located as high as blades, a coil of the rotating electric magnet is connected to the controller, and the controller is connected to a power supply interface. By innovatively applying magnetic levitation control technology, the soybean milk machine according to the invention can overcome the gravity of the rotor and the blades by means of magnetic levitation control technology so as to levitate inside the inner cavity, and the rotor in the inner cavity of the soybean milk machine is driven through magnetic force to rotate so as to prepare soybean milk; besides, the soybean milk machine according to the invention has unique design and novel structure, lowers the production cost of the entire machine, prolongs the service life, and is more convenient and complete to clean, thus guaranteeing food safety and sanitation.

The invention relates to the field of special mechanical equipment, in particular to a lifting hook with a gravity lever type anti-unhooking device. The lifting hook comprises a hook body (1) and a hook handle (2), wherein an anti-unhooking device is mounted on a joint of the hook body (1) and the hook handle (2). According to the lifting hook, by adopting the gravity lever principle, two iron plates (one short plate and one long plate) are fixed by bolts and also can be welded together; the short plate (namely an anti-dropping plate) is closed with the lifting hook by virtue of self-gravity of the long rod; and the anti-dropping plate and the lifting hook are always closed under a normal condition, so that only is gravity difference between the long rod and the anti-dropping plate required to overcome in the counter-clockwise direction in an open state. Force of opening the anti-dropping plate is far lower than twisting force, overcome by an existing lifting hook with an anti-unhooking device, of a spring, so that the force of opening the anti-dropping plate does not need to artificially overcome. The lifting hook is reasonable in design and simple in structure, so that the lifting hook with the anti-unhooking device is relatively practical and safe, and has good market application prospect.

The invention belongs to the field of unmanned aerial vehicles and provides an unmanned aerial vehicle device on the heavy load condition and a control method. The unmanned aerial vehicle device on the heavy load condition comprises an unmanned aerial vehicle body structure and a master control unit controlling various systems of the unmanned aerial vehicle to be operated normally. The unmanned aerial vehicle device on the heavy load condition further comprises an air bag device providing upward tension for the unmanned aerial vehicle. The air bag device is arranged above the unmanned aerial vehicle body structure and filled with low-density gas with the density lower than that of air. The air bag device is further connected with an exhaust device for exhausting gas volume inside the air bag device. The tension generated by the air bag device is adjustable by controlling the gas volume inside the air bag device. According to the device, onboard energy consumption of an unmanned aerial vehicle on the heavy load condition is lowered, and the flight working time of the unmanned aerial vehicle is prolonged, so that the working efficiency of the unmanned aerial vehicle is achieved, the working time of the unmanned aerial vehicle on the heavy load condition is prolonged, the working range of the unmanned aerial vehicle on the heavy load condition is enlarged, and the defect that use of the unmanned aerial vehicle is limited on the heavy load condition is overcome.