37results about How to "Prevent rapid fall" patented technology

The invention discloses a quick lifting mechanism applied to bridge construction. The quick lifting mechanism comprises a movable rack, a motor crawler belt assembly and a hanging basket. The A trussis fixedly mounted on the top of the movable rack. The motor crawler belt assembly is fixedly mounted on the outer wall of the top of the movable rack. The outer wall of the end of the movable rack ishinged to the outer wall of the middle portion of a supporting frame. The upper half portion of the supporting frame is internally provided with sliding grooves. Wire ropes are wound on the outer walls of winding wheels and are attached to the outer walls of guide wheels. The hanging basket is fixed to the lower ends of the wire ropes. The edges of the ends of the movable rack are fixedly connected with locating tubes. The quick lifting mechanism applied to bridge construction facilitates position movement and change and positioning operation. The positioning and installation stability and efficiency of the mechanism are improved. Meanwhile, the quick lifting mechanism can be protected against falling in the using process. Potential construction safety hazards of the quick lifting mechanism during lifting motion are effectively reduced.

The invention relates to an easy-to-climb communication iron tower, which includes a tower base, a tower body, a driving mechanism, a lifting mechanism and a protection mechanism. The driving mechanism includes a first motor, a reducer, a first synchronous pulley, a second synchronous pulley, The synchronous belt and connecting block, the lifting mechanism includes a pillar, a bottom plate and a car, the protection mechanism includes a support plate, a first spring and a clamping assembly, and the clamping assembly includes a first support plate, a second support plate and a second spring, which is easy to The climbing communication tower uses the motor-driven synchronous pulley mechanism to realize the lifting of the passenger car. Compared with manual climbing, it not only saves manpower and time, but also solves the safety hazard of manual climbing. In addition, the communication tower is also equipped with a protection mechanism, which can not only prevent the lifting mechanism from falling rapidly, but also play a buffer role when the lifting mechanism falls relatively quickly.

The invention discloses a transient active power control method for an energy storage power station, and belongs to the technical field of multi-infeed extra-high voltage AC / DC hybrid power grids, andthe control method comprises the steps: continuously detecting the real-time DC current of an inversion side and the AC bus voltage of the inversion side; when the real-time direct current is greaterthan a first current threshold value or the alternating current bus voltage is less than a voltage threshold value, controlling the energy storage power station to enter a transient control mode; determining an output time instruction corresponding to the energy storage active output by using the size relationship between the real-time direct current and a first current threshold value and a second current threshold value, wherein the first current threshold value is greater than the second current threshold value; determining by utilizing the size relationship between the alternating currentbus voltage and the voltage threshold value; and sending an energy storage active instruction of the target output amplitude to the energy storage power station at the target output moment accordingto the output time instruction and the output amplitude instruction. According to the control method provided by the invention, the energy storage active power output is applied to the field of commutation failure suppression, and the continuous commutation failure after the DC fault can be effectively suppressed.

The invention discloses a warehouse stacking machine for logistics, which comprises a supporting base, a first servo motor, a driving motor, a traction steel cable and a second servo motor, wherein a fixing cylinder is mounted in the supporting base; the driving motor is mounted in the middle of the supporting base; supporting wheels are connected to the lower portions of the left end and the right end of a mounting base correspondingly; and the second servo motor is mounted in the rear end of a receiving box. According to the warehouse stacking machine for logistics, positioning is convenient after the warehouse stacking machine moves to a designated position, the situation that work is affected due to displacement of the warehouse stacking machine in the stacking process is avoided, synchronous adjustment and control of the warehouse stacking machine are facilitated, and operation and use of the warehouse stacking machine are facilitated; moreover, the warehouse stacking machine has a manual monitoring function, so that parcels are prevented from rapidly falling off due to machine faults, and potential safety hazards can be eliminated; a rope wheel system of the warehouse stacking machine is provided with a lubricating structure, so that in the long-term use process, the abrasion degree of the rope wheel system can be reduced; and meanwhile in the lifting process, parcels are not prone to shaking optionally.

The invention discloses a real-time active torque compensation type balancing method of an articulated coordinate measuring machine. The existing balancing method of the articulated arm type coordinate measuring machine cannot realize real-time dynamic balance. According to the invention, a real-time active moment compensation type balancing device is arranged at a swing joint of the articulated arm type coordinate measuring machine; if the computer judges that the torque generated by the first swing joint is smaller than the minimum torque reaction value, the motor is controlled not to outputthe rotating torque; if the computer judges that the torque generated by the first swing joint is larger than or equal to the minimum torque response value and smaller than or equal to the theoretical torque value generated by the measuring arm assembly at the current position to the rotating center of the first swing joint, the motor is controlled to output rotating torque equal to the torque value of the torque sensor; and if the computer judges that the torque generated by the first swing joint exceeds the theoretical torque value of the current position, the motor is controlled to outputthe rotating torque equal to the theoretical torque value. According to the invention, real-time dynamic balance of the measuring arm is realized, and the operation load of an operator is reduced.

The invention relates to the technical field of artificial intelligence, and discloses a goods carrying manipulator based on artificial intelligence. The goods carrying manipulator based on artificial intelligence comprises a fixing rod, wherein the outer side of the fixing rod is movably connected with shells, the inner wall of each shell is movably connected with a rotating disc, the inner walls of the rotating discs are provided with grooves, the inner wall of each groove is fixedly connected with a spring, a pressing ball is movably connected to the inner side of each groove, an electric contact is movably connected to the outer side of each pressing ball, conductor rails are fixedly connected to the positions, close to the outer side of the corresponding grooves, of the inner walls of the rotating discs, and a sliding groove is formed in the inner wall of the fixing rod. According to the goods carrying manipulator based on artificial intelligence, through electric connection of the electric contacts and the conductor rails, when the mass of goods is large and exceeds the bearing limit of the manipulator, the goods are prevented from sliding off in the carrying process of the manipulator, the goods are prevented from being damaged, resources are saved, and economic losses are reduced; and meanwhile, rapid falling of the manipulator is avoided, damage to the manipulator is prevented, and the service life of the manipulator is prolonged.

The invention discloses a hopper protection device of a bucket elevator mixing station, and belongs to the field of concrete mixing. The hopper protection device comprises a frame and a hopper, and ischaracterized in that a first locking fixed block, a first locking movable block and a first locking cylinder are arranged on the frame, and a first protective steel wire rope penetrates through a first positioning block and a second positioning block and is positioned between the first locking fixed block and the first locking movable block; a second locking fixed block, a second locking movableblock and a second locking air cylinder are arranged on the rack, a second protection steel wire rope penetrates through the third positioning block and the fourth positioning block and is located between the second locking fixed block and the second locking movable block, a first tensioner is installed on a first lower pulley, and a second tensioner is installed on a second lower pulley. The hopper protection device can effectively prevent the hopper frame and the hopper from falling rapidly after a lifting steel wire rope is broken, is simple in the structure, has the universality, can be used for the hopper protection of various types, and can effectively guarantee the use safety.

The invention discloses a high-rise elevator rope-breaking safety protection device and method. The device comprises an elevator lift car and an elevator shaft wall; the elevator lift car is disposedin the elevator shaft wall; and a braking protection device is disposed on the elevator lift car. When rope breaking occurs, an elevator steel wire rope loses pulling force on a fixing sleeve, under pushing of detection springs, the fixing sleeve moves downwards to drive a locking pull rod to be separated from a locking wheel, a locking effect on an advancing gear disappears, driving springs are contracted to generate a downward pulling force, an advancing rack moves downwards, a double protection measure is started in the process of downward movement of the advancing rack to perform braking and speed reduction of safety tongs on an elevator, then the speed is reduced the moment the elevator falls, a sliding block at the lower end drives a sliding rack to move downwards, then driving gearsare driven to rotate, driving rods connected with the driving gears rotate towards the outer side, push rods are driven to push braking stop rods, the braking stop rods can make contact with brakingtables, and therefore the elevator lift car is prevented from falling beyond one floor.

The present invention relates to the technical field of fish flesh processing devices, particularly discloses a material refining device for fish flesh stuffing based on centrifugal force and aims tosolve a technical problem of crushing by fish flesh crushing machines. In order to solve the above technical problem, the present invention provides the material refining device for the fish flesh stuffing based on the centrifugal force. The material refining device for the fish flesh stuffing based on the centrifugal force comprises a seat table; the top part of the seat table is fixedly connected with a material refining box; an opening in the bottom part of the material refining box is inserted internally with a material discharging pipe; the top part of the material refining box is fixedlyconnected with an oscillating device; the bottom part of the oscillating device is provided with a centrifugal force material refining mechanism; the bottom part of the centrifugal force material refining mechanism sleeves inside the material refining box; and the surface of the material refining box is respectively movably connected with the both sides of the internal wall of the material refining box. The rotation of the centrifugal force material refining mechanism can drive a crushing ball and wing plates to rotate by centrifugal force in a gradually rising trend. When a horizontal direction is reached, the rising is stopped, so that fish flesh can be crushed thoroughly; and besides, the wing plates can prevent excessive fish flesh splashes.

The invention discloses a cluster box lifting safety device, and solves the problems of inconvenience to dismount a traditional cluster box and a frame safety rod and weak use effect. A lifting support frame is fixedly connected to one end of a frame; one end of a cluster box is hinged to the top of the lifting support frame; a piston rod of a hydraulic cylinder is hinged to the cluster box by a first hinge base; a cylinder body is hinged to the lower part of the lifting support frame by a second hinge base; a box body on the outer side of the cluster box is connected with a fixed base by a fixed plate; a hinge end of a safety lever is hinged to one side of the first hinge base by a third hinge base, and a free end is fixed with a connecting plate; and the connecting plate is pinned to the fixed base by an elastic bolt, or is deviated from the elastic bolt to eject against a cylinder cover of the hydraulic cylinder. The cluster box lifting safety device is reasonable in design, simple in structure and excellent in safety, can pull the elastic bolt to deviate the safety lever from the fixed base, and is convenient to operate and reliable in use.

The invention discloses a shovel plate lifting hydraulic control integrated valve block. The shovel plate lifting hydraulic control integrated valve block comprises a valve body, the valve body is internally provided with an interconnected first oil channel and second oil channel, the two ends of the first oil channel respectively form a port A and a port C1 on the valve body, the two ends of thesecond oil channel form a port P and a port T respectively on the valve body, the first oil channel communicates with a sequential valve, an oil inlet of the sequential valve communicates with the port A, and an oil outlet of the sequential valve communicates with the port C1, the communication position of the first oil channel and the second oil channel is located between the sequential valve andthe port C1, the second oil channel successively communicates with a pressure reducing valve, a one-direction valve and an adjustable throttle valve from the port P to the port T, the oil inlet of the pressure reducing valve communicates with the port P and the oil outlet of the pressure educing valve communicates with the oil inlet of one-direction valve, the oil outlet of the one-direction valve communicates with the adjustable throttle valve, and the communication position of the first oil channel and the second oil channel is located between the one-direction valve and the adjustable throttle valve.

The invention discloses a hydraulic device for preventing movable arm of a hydraulic excavator from falling accidently. The device comprises a valve plate, a cartridge valve component and a first pressure measuring unit, wherein the valve plate is arranged on a boom cylinder of the hydraulic excavator, a valve plate inner oil way is processed for the valve plate and comprises a first port and a second port, the first port is communicated with a system oil way of the excavator through a pipeline, the second port is communicated directly with a large cavity of the boom cylinder; the cartridge valve component is arranged on the valve plate, in a communicating connection with a control system of the excavator, communicated with the valve plate inner oil way arranged between the first port and the second port, and connects or disconnects the oil way between the first port and the second port; and the first pressure measuring unit is communicated with the first port and in a communicating connection with the control system of the excavator. According to the device, the cartridge valve component and the first pressure measuring unit are adopted, therefore the device can adapt to high-flow working condition, the cost of construction is low, secondary development is not needed, and the device is easy to maintain.

The invention discloses a throwing egg for the environmental protection treatment of fire air particle pollutants, which comprises an impact bottom shell, a magnetic force adjustment mechanism is fixedly connected to the middle position of the bottom of the inner cavity of the impact bottom shell, and the top of the restriction plate is located outside the magnetic force adjustment mechanism for movement. A magnetic tensioning mechanism is connected, one end of the tensioning string away from the magnetic tensioning mechanism is fixedly connected with a bow-shaped elastic piece, an airbag is provided at the bottom of the inner cavity of the projected egg shell, and a suspension is slidably connected to the inner surface of the shielding plate. In the guiding mechanism, the inner cavity of the projecting egg shell is located in the middle position above the suspension guiding mechanism, and a dry ice storage egg is arranged, and the invention relates to the technical field of environmental protection. By condensing moisture in the air, attaching particulate pollutants to increase its own gravity and dripping, the surrounding temperature drops, avoid overheating and evaporation, make particulate cleaning more efficient and thorough, reduce the hazard of fire, and help protect the surrounding environment, requiring close contact , effectively protect the safety of personnel.

The invention discloses a horizontal refrigerator door hinge. The horizontal refrigerator door hinge comprises a hinge head and a hinge base. A hinge shaft and a movable shaft are hinged to the hingehead; a supporting seat is arranged at the lower part of the hinge base; a supporting plate is movably inserted into the middle part of the supporting seat; the supporting plate is sleeved with a compression spring; a damper is arranged outside an arc-shaped channel on at least one side of the hinge seat; the damper comprises a damper body, an arc-shaped guide rail, a damping cavity, a damping cylinder cover, a damping rod, a piston, a first cavity, a second cavity, a damping spring, a pressing disc, and a damping end block; the first cavity and the second cavity are filled with non-Newtonianfluid; and a cavity between the pressing disc and the damping end block is filled with hydraulic oil. By means of the structural arrangement of the horizontal refrigerator door hinge, when a door bodyis closed, multiple damping is formed through the arrangement of the compression spring, the damping spring in the damper and non-Newtonian fluid in the first cavity, so that the door body can be prevented from falling rapidly, damage to a cabinet body can be reduced, and meanwhile noise is lowered.

The invention discloses a hopper protection device for a bucket lifting mixing station, which belongs to the field of concrete mixing, and includes a frame and a hopper, and is characterized in that: the frame is provided with a first locking fixed block, a first locking movable block and a first Lock the cylinder, the first protective wire rope runs through the first positioning block and the second positioning block and is located between the first locking fixed block and the first locking movable block; the frame is provided with a second locking fixed block, a second Lock the movable block and the second locking cylinder, the second protective wire rope runs through the third positioning block and the fourth positioning block and is located between the second locking fixed block and the second locking movable block, and the first lower pulley is equipped with The first tensioner, the second tensioner is installed on the second lower pulley. The invention can effectively prevent the rapid fall of the hopper frame and the hopper after the lifting wire rope is broken, has a simple structure and is versatile, can be used for various types of hopper protection, and can effectively guarantee the safety of use.

An elevating pipe conveying vehicle has a front frame and a rear frame, and a lifting seat is arranged on the rear frame. The elevating pipe conveying vehicle has a hydraulic system for lifting and prohibiting walking. Directional valve, second hydraulic pump, power cut-off valve, gear selection operating valve, forward gear clutch, reverse gear clutch and lift cylinder, gear selection operating valve includes joystick, oil outlet of the first hydraulic pump and manual directional valve The oil inlet port P of the manual reversing valve is connected to the port A and port B of the manual reversing valve respectively connected to the rod cavity and the rodless cavity of the lift cylinder, and the rodless cavity of the lift cylinder is connected to the control port K of the power cut-off valve The oil inlet port P and the execution port A of the power cut-off valve are respectively connected with the oil outlet port of the second hydraulic pump and the oil inlet port P of the gear selection operation valve, and the execution port A, Port B is connected to the forward gear clutch and the reverse gear clutch respectively. When the lift pipe transport vehicle is in the lifting state of the compartment, the vehicle cannot be shifted forward, which can ensure the safe running of the pipe transport vehicle.

A kind of tea processing equipment according to the present invention comprises a machine body, a feeding hopper is fixedly installed on the upper end of the machine body, an installation cavity with an opening facing left is arranged in the body, a drying kettle is fixedly installed on the top wall of the installation cavity, The drying kettle is provided with a kettle cavity, and the bottom of the kettle cavity is provided with an outlet, and a sealing cover is hingedly installed on the right side of the outlet, and a vertical plate is installed symmetrically on the upper end of the sealing cover, and two vertical panels A first rotating shaft is rotatably installed between them, and a first stirring plate is fixedly installed on the first rotating shaft, and a first motor power-connected with the first rotating shaft is fixedly installed in the rear vertical plate. Scrapers are installed against the inner wall of the still cavity, and a second rotating shaft extending up and down is installed in rotation and fit on the top wall of the still cavity.

The invention discloses a lying-type-weight-lifting-barbell assisting device for fitness equipment. The lying-type-weight-lifting-barbell assisting device comprises a main hollow shell, and hydraulicoil storage space is formed in the center inside of the main hollow shell. The lying-type-weight-lifting-barbell assisting device is mainly used for assisting lying-type barbell weight lifting; in addition, on the premise that normal work and gravity of a barbell are not influenced, the phenomenon that the barbell rapidly falls can be effectively prevented, the event that due to lack of physical strength of an exerciser, a person is injured by falling of the barbell can be effectively prevented, and practicability is high; in addition, the device comprises a liquid one-way flowing speed control mechanism, one-way flowing of liquid can be effectively controlled, and the normal flowing speed of the liquid can also be effectively controlled; in addition, the device comprises a liquid middle flow-dividing connecting mechanism, and the effect of synchronizing working and supporting can be achieved; in addition, the device comprises a stretchable barbell end connecting supporting mechanism,the connecting and limiting effect on the barbell can be achieved while free vertical movement is achieved.

The invention relates to the related technical field of environment-friendly travel, and discloses an automatic folding and unfolding bicycle tripod which comprises a wheel, axles are fixedly mounted on the two sides of the wheel respectively, ball bearings are fixedly mounted on the side walls of the axles, supporting frames located on the outer sides of the axles are fixedly mounted on the side walls of the ball bearings, and brackets are fixedly mounted on the side walls of the supporting frames. Driving fan blades are movably installed on the side walls of the axles, in the process that the axles drive the driving fan blades to rotate, the driving fan blades stretch out to enable the airflow pressure in the inner cavities of the brackets to be enhanced, the tripod is further lifted in the riding process, and automatic folding is achieved; at the same time, when the driving fan blades are extended, the circulation area of the inner cavities of the supporting frames and the outside is reduced, so that the phenomenon that damping is generated when airflow in the inner cavities of the supporting frames flows out is achieved, the tripod is prevented from rapidly falling in the riding process, and finally the purposes that the tripod is automatically folded in the riding process and directly falling in the riding process is avoided are achieved.

The present invention relates to the technical field of fish flesh processing devices, particularly discloses a material refining device for fish flesh stuffing based on centrifugal force and aims tosolve a technical problem of crushing by fish flesh crushing machines. In order to solve the above technical problem, the present invention provides the material refining device for the fish flesh stuffing based on the centrifugal force. The material refining device for the fish flesh stuffing based on the centrifugal force comprises a seat table; the top part of the seat table is fixedly connected with a material refining box; an opening in the bottom part of the material refining box is inserted internally with a material discharging pipe; the top part of the material refining box is fixedlyconnected with an oscillating device; the bottom part of the oscillating device is provided with a centrifugal force material refining mechanism; the bottom part of the centrifugal force material refining mechanism sleeves inside the material refining box; and the surface of the material refining box is respectively movably connected with the both sides of the internal wall of the material refining box. The rotation of the centrifugal force material refining mechanism can drive a crushing ball and wing plates to rotate by centrifugal force in a gradually rising trend. When a horizontal direction is reached, the rising is stopped, so that fish flesh can be crushed thoroughly; and besides, the wing plates can prevent excessive fish flesh splashes.

The invention provides a hinge device which can be flattened and has a simple structure, and various machines provided with the same. The hinge device can prevent a manuscript pressing plate from rapidly falling down when the manuscript pressing plate is closed, and a user can obtain a smooth operation feeling. The hinge device includes: a mounting member attached to a machine body side; a support member attached to the manuscript pressing plate and composed of a fulcrum shaft portion and a support portion; a hinge shaft that rotatably connects the fulcrum shaft portion of the support member between a pair of side plates of the mounting member; a sliding member accommodated in an accommodating part in a sliding manner, wherein a sliding block cam convex part is arranged at the top of the sliding member; an elastic member arranged between the bottom of the accommodating part and the sliding member; a damper arranged in the elastic member; and a pressing rod which abuts against a first rotating cam part at a predetermined closing angle when the manuscript pressing plate performs a closing action, and is accommodated in a guide cylinder part in a sliding manner.

The invention relates to a resistance buffer device for rockfall prevention, which is characterized by comprising a flexible steel wire mesh enclosure, multiple steel ring fasteners, parachute cords, a drag parachute sleeve, steel stranded wires, steel wires, a drag parachute and expansion bolts, wherein two ends of the flexible steel wire mesh enclosure are connected with one ends of the steel stranded wires respectively; the multiple steel ring fasteners are arranged on the edge of the drag parachute and are connected with one ends of the parachute cords respectively; the other ends of the parachute cords are connected with the other ends of the corresponding steel stranded wires through the steel ring fasteners; the drag parachute is accommodated in the drag parachute sleeve; the top end of the drag parachute sleeve is connected with a steel wire rope with one fixed end; the flexible steel wire mesh enclosure is fixed at two ends of a dangerous rock through the expansion bolts. The resistance buffer device is reliably, conveniently and rapidly used for preventing rockfall from falling or rolling at a high speed and more powerfully provides safeguard for life and property security of people.

An energy storage device comprises a supporting plate, the outer surface of one side of the supporting plate is connected with a sliding part, the upper end face of the supporting plate is provided with a rotating groove, the rotating groove is connected with a rotating part through a rotating shaft, one side of the rotating part is connected with a cover plate, the lower end face of the cover plate is provided with a containing cavity, and the two sides of the outer surface of the supporting plate are connected with protection mechanisms. When the suction cup is used, a place with good ventilation can be selected for wall suction fixing, ventilation can be performed through the containing cavity in the cover plate after the suction cup is fixed and the energy storage box is placed, and due to the fact that after the cover plate covers the energy storage box, the containing cavity cannot abut against the upper end face of the energy storage box, a small space can be reserved, and ventilation can be performed through the small space. And the ventilation requirement is favorably improved.

The invention discloses a magnetic damping hinge for a refrigerator. The magnetic damping hinge comprises a hinge head and a hinge seat. A hinge shaft and a movable shaft are hinged to the hinge head;the two ends of the hinge shaft are hinged to the hinge seat, and an arc-shaped channel is formed in the hinge seat; a supporting seat is arranged on the lower part of the hinge seat, and a supporting plate is movably inserted into the middle part of the supporting seat; a spring lower pad is arranged at the top of the supporting seat, a spring upper pad is arranged on the middle-upper part of the supporting plate, and a hinge spring sleeves the supporting plate between the spring upper pad and the spring lower pad; a fixed strong magnet is arranged at the bottom of the hinge seat, and a movable strong magnet is slidably arranged on the hinge seat on the upper part of the fixed strong magnet; the bottom end of the movable strong magnet and the top end of the fixed strong magnet are repellent homopoles; and the bottom end of the supporting plate abuts against the top end of the movable strong magnetic magnet. In the downward moving process of the door closing supporting plate, the lower end of the supporting plate pushes the movable strong magnet to move downwards, the homopolar repulsive force of the magnet becomes larger and larger, the closing speed of a door body is decreased,so that the damping effect is achieved, and the door body is prevented from falling rapidly.

The invention provides a pull-up training machine capable of preventing muscle strain and a use method thereof, and relates to the technical field of fitness equipment, the pull-up training machine comprises a base, vertical cylinders are symmetrically and fixedly mounted on the surface of the base, vertical rods are sleeved with the vertical cylinders, rectangular blocks are fixedly mounted at the top ends of the vertical rods, curved bars are fixedly mounted on the outer sides of the rectangular blocks, and the curved bars are fixedly connected with the vertical cylinders. Grips are fixedly installed at the two ends of the bent rod, a cross rod is rotationally connected between the vertical cylinders, a supporting plate is fixedly installed at one end of the cross rod, and a through groove is formed in the surface of the cross rod. According to the pull-up training device, by arranging the cross rod, in the pull-up training process of a user, the balance weight disc can press the cross rod to rotate so as to assist in supporting the user to conduct training, along with rotation of the cross rod, the sliding block can slide to the far end of the cross rod, the supporting plate can provide larger supporting force for the user, the user is prevented from rapidly falling off, and the training effect is improved. And therefore, the muscles of the user are effectively prevented from being strained, and the user can conveniently perform training.

The invention discloses a high-rise elevator rope-breaking safety protection device and method. The device comprises an elevator lift car and an elevator shaft wall; the elevator lift car is disposedin the elevator shaft wall; and a braking protection device is disposed on the elevator lift car. When rope breaking occurs, an elevator steel wire rope loses pulling force on a fixing sleeve, under pushing of detection springs, the fixing sleeve moves downwards to drive a locking pull rod to be separated from a locking wheel, a locking effect on an advancing gear disappears, driving springs are contracted to generate a downward pulling force, an advancing rack moves downwards, a double protection measure is started in the process of downward movement of the advancing rack to perform braking and speed reduction of safety tongs on an elevator, then the speed is reduced the moment the elevator falls, a sliding block at the lower end drives a sliding rack to move downwards, then driving gearsare driven to rotate, driving rods connected with the driving gears rotate towards the outer side, push rods are driven to push braking stop rods, the braking stop rods can make contact with brakingtables, and therefore the elevator lift car is prevented from falling beyond one floor.

The invention discloses a lying-type-weight-lifting-barbell assisting device for fitness equipment. The lying-type-weight-lifting-barbell assisting device comprises a main hollow shell, and hydraulicoil storage space is formed in the center inside of the main hollow shell. The lying-type-weight-lifting-barbell assisting device is mainly used for assisting lying-type barbell weight lifting; in addition, on the premise that normal work and gravity of a barbell are not influenced, the phenomenon that the barbell rapidly falls can be effectively prevented, the event that due to lack of physical strength of an exerciser, a person is injured by falling of the barbell can be effectively prevented, and practicability is high; in addition, the device comprises a liquid one-way flowing speed control mechanism, one-way flowing of liquid can be effectively controlled, and the normal flowing speed of the liquid can also be effectively controlled; in addition, the device comprises a liquid middle flow-dividing connecting mechanism, and the effect of synchronizing working and supporting can be achieved; in addition, the device comprises a stretchable barbell end connecting supporting mechanism,the connecting and limiting effect on the barbell can be achieved while free vertical movement is achieved.