1137results about How to "Avoid danger" patented technology

The invention discloses a maritime work crane with a windproof high-stability structure, and belongs to the technical field of maritime work cranes, the maritime work crane is provided with a supporting column convenient to position and assemble, the upper surface of the supporting column is rotatably connected with a suspension arm, the inner surface of the suspension arm is telescopically connected with a telescopic arm, and the front side of the inner surface of the telescopic arm is rotatably connected with a guide wheel; comprising a main lifting rope rotationally connected to the outer surface of the guide wheel, and the lower side of the main lifting rope is installed on the lower surface of the telescopic arm. An angle monitoring mechanism is arranged, the angle of the rotating frame on the telescopic arm can be conveniently controlled, adjustment of a first straight tooth gear and a first rack can be matched, so that the rotating stability of the rotating frame is controlled, and adjustment of a clamping jaw and a limiting wheel is matched, so that the angle of the clamping jaw on the rotating frame is driven through the limiting wheel; therefore, the angle stability of the clamping jaw and the angle monitoring convenience of the main lifting rope are controlled, lifted goods are prevented from inclining, and danger is avoided.

The invention discloses a scene-based mine car unmanned driving safety control method and system, and belongs to the technical field of mine automatic driving. The method comprises the steps of collecting scene data of mining area work in real time; performing feature extraction according to the scene data and the task data, and dividing the extracted features into a macroscopic scene layer and a microscopic scene layer; using the decision tree model to make a vehicle behavior decision and output a driving path and a target speed; a rule engine is adopted for scene risk assessment, control arbitration is conducted on control instructions of a vehicle driving system, a braking system, gears, an operation system and a warning system according to scene risk levels, safety measures are dynamically adjusted, and a safety control instruction for the vehicle is output; and the vehicle executes the control instruction according to the safety control instruction and the current vehicle state. According to the invention, scenes with different complexity and risk levels in a mining area can be identified through a double-layer classification method, and proper safety measures can be taken by vehicles in different scenes.

The invention discloses a safety detection system for a tool magazine of a gantry machine tool, relates to the technical field of gantry machine tools, and solves the problems that an object entering a blind area cannot be quickly recognized to belong to a human body, and the comprehensiveness of recognition needs to be improved. By means of two-dimensional coordinate system analysis, central point overlapping and zooming operation, calculating an overlapping area proportion so as to judge whether the area is a human body area or not; the scientific judgment mode improves the accuracy and reliability of recognition, reduces the false alarm rate, ensures the accurate transmission of early warning information, and can quickly send out an early warning signal through the early warning end to remind an operator to take measures in time to avoid danger once the system judges that a change area belongs to a human body area; the real-time response mechanism can effectively reduce the probability of accidents and kill potential risks in the bud.

The invention discloses equipment and a method for detecting the strength of an annular section of a large-diameter TA31 pipe, and relates to the technical field of pipes. According to the annular section strength detection equipment for the large-diameter TA31 pipe, through the design of a composite mechanism, the pipe is placed in the processing mechanism, the pipe space is restrained through the limiting mechanism, the pipe is prevented from moving in the inspection process, danger to workers is avoided, and therefore normal operation of the equipment is kept; the fixing mechanism controls the pipe to rotate and rub with the processing mechanism, so that the effect of cleaning the surface of the pipe is achieved, the situation that stains on the surface of the pipe affect the detection effect is avoided, a hydraulic rod controls a pressing plate to extrude the surface of the pipe, and the detection effect on the annular section strength of the pipe is achieved; therefore, the friction force on the surface of the pipe is increased, the pipe is prevented from shaking in the downward pressing process, and the operation stability is improved.

The invention relates to the technical field of clothes processing equipment, in particular to a heat pump washing and drying integrated machine. The problem that an existing heat pump washing and drying all-in-one machine is poor in drying efficiency is solved. Therefore, the heat pump washing and drying all-in-one machine comprises a barrel module and a heat pump module, the heat pump module comprises a first drying air duct, a fan and a second drying air duct which are connected in sequence, an evaporator is arranged in the second drying air duct, and a condenser is arranged in the first drying air duct; a fresh air inlet is formed in the second drying air channel and located between the evaporator and the draught fan. The fresh air inlet is formed in the second drying air duct, in the process of executing the drying program, external dry fresh air can be introduced, the drying efficiency can be improved, in addition, the fresh air inlet is formed between the evaporator and the fan, more fresh air can be introduced, and the drying efficiency is improved. And the temperature of the entering fresh air is not affected by the temperature of the evaporator, and the drying efficiency can be better improved.

The invention discloses an ultrasonic detection device for boiler pipelines, comprising an ultrasonic detector body, a data cable is installed on the top of the ultrasonic detector body, a plug is installed on one end of the data cable, a connecting block is installed on one side of the plug, a connecting rod is installed on the bottom of the connecting block, a universal ball is installed on one side of the connecting block, a universal ball seat is installed on one side of the universal ball, a flaw detection metal block is installed on one side of the universal ball seat, and a protective rubber stick is installed on one side of the damping spring. The invention provides a connecting rod, a universal ball seat, a universal ball and a telescopic rod, which solves the problem that a user cannot hold the flaw detection metal block to detect the boiler pipeline when detecting a boiler pipeline installed at a high position, and provides a fixing ring, a protective rubber stick and a damping spring, which solves the problem that the flaw detection metal block is easy to collide with the metal hard object next to the high boiler pipeline when the flaw detection metal block approaches the high boiler pipeline.

The invention relates to the technical field of aluminum profile machining, and discloses an aluminum profile production die which comprises a base and a die body, a stamping assembly is arranged at the top of the base and comprises a support, a hydraulic oil cylinder and a stamping head, and material changing assemblies for assisting feeding and discharging are arranged in the base and on the die body. According to the production die for the aluminum profile, through the arrangement of the material changing assembly, after stamping is finished, an output shaft of an electric push rod drives a push plate and a transverse rod to move leftwards to return, the transverse rod pulls a vertical rod to move upwards through a supporting rod, the vertical rod drives a sliding plate to move upwards, and the sliding plate is driven to move upwards; the sliding plate drives the connecting rod and the ejection plate to move upwards, the ejection plate ejects the punched and formed workpiece out, manual feeding and discharging of workers are not needed, danger can be effectively avoided, the overall working efficiency is improved, and continuous production and machining are facilitated.

The invention discloses a maritime emergency rescue route planning method, system and equipment and a storable medium, which can quickly distinguish passable and impassable areas, optimize the planning process, reduce the resource waste, and utilize the Dikstra algorithm to realize the route planning by dividing the nationwide sea area into basic grids and storing the passage, water depth and passable surface information of the grids. Various factors can be comprehensively considered, an optimal rough path is planned from a starting point to an end point, after a path gap is identified, the algorithm is applied again to analyze an optimal refined path, fill a blank and ensure that rescue workers directly reach a target, meanwhile, path segments intersecting with an impassable surface can be judged and automatically removed, an army is prevented from mistakenly entering a dangerous area, and the rescue efficiency is improved. By identifying the gap and planning the refined path, the continuity and integrity of the rescue path are guaranteed, the rescue failure risk caused by the path problem is reduced, in addition, the accurate planning can also reduce unnecessary detour and stay, and smooth rescue action is ensured.

The utility model discloses a microgravity experimental instrument which comprises a vertical framework, and a plurality of friction plates are installed on the front outer wall and the rear outer wall of the vertical framework in the vertical direction. The rising and falling platform body is installed at one end in the vertical framework in a sliding mode, and an experiment cabin is installed at the top end of the rising and falling platform body; and the belt wheel lifting units are installed on the two sides of the interior of the vertical framework and used for driving the lifting platform body to do accelerated lifting motion. According to the utility model, the active brake mechanism and the friction plate are matched to work to control the accelerated rising of the rising and falling platform body and the deceleration of the free falling body, experiment parameters are ensured to be within a required range, meanwhile, the active brake mechanism can increase the safety of an experiment, and especially in an emergency, the active brake mechanism and the friction plate can be used for an emergency stop experiment. And unnecessary damage or danger is avoided.

The invention discloses a measuring tool force measuring device, which relates to the technical field of measuring tool force measurement, and comprises an elastic telescopic table, a telescopic rod, a hard rod, a vertical plate, a trapezoidal rod, a telescopic baffle plate, a telescopic plate, a supporting table, a triangular prism, a triangular block, a cuboid, a round rod, a lifting block and a frame, the fixed end of the telescopic rod is fixedly installed at the bottom of the free end of the elastic telescopic table, one end of the hard rod is fixedly installed at the free end of the telescopic rod, one end of the vertical plate is fixedly installed at the other end of the hard rod, and the trapezoidal rod is slidably installed in the first sliding groove. When the door plate moves over the triangular prism, the triangular prism can bounce upwards to limit the door plate, so that the situation that non-staff open the protection plate carelessly, damage is caused to a machine working normally can be effectively prevented, and meanwhile damage to surrounding staff can also be prevented.

The invention relates to the technical field of robots, and discloses a robot leg walking mechanism and a quadruped robot, the robot leg walking mechanism comprises a plurality of big arms, one side of each big arm is connected with a floating assembly, the floating assembly comprises a connecting box and an air bag, the connecting box is fixedly connected with one side of the big arm, and a placing groove is formed in the side, away from the big arm, of the connecting box; an air bag is fixedly connected into the containing groove, one side of the big arm is sequentially connected with an inflation assembly, a deflation assembly and an air injection assembly from top to bottom, and one side of the connecting box is connected with a closing assembly. According to the robot leg walking mechanism and the quadruped robot, by means of the floating assembly, the quadruped robot can keep floating in a deep water area, so that a robot body is prevented from being completely immersed in water, the risk that a camera lens is stained with water is reduced, and the quality and accuracy of real-time image transmission are ensured; therefore, a clear visual field and stable walking capability are provided for the quadruped robot, visual misjudgment or distortion can be reduced, and the accuracy and efficiency of inspection tasks are improved.

The invention discloses a welding device for a cable bridge, which relates to the technical field of cable bridges and comprises a welding table, wherein a table leg is fixedly installed at the bottom of the welding table, a welding frame is fixedly installed at the top of the welding table, a lifting device is fixedly installed at the top of the welding frame, the lifting device comprises a lifting motor, a threaded rod and a sleeve, a lifting motor is fixedly installed at the top of the welding frame, a threaded rod is fixedly installed at the output end of the lifting motor, a sleeve is slidably installed on the circumferential surface of the threaded rod, the threaded rod is threadedly connected to the sleeve, a welding gun is fixedly installed on the circumferential surface of the sleeve, a slow-speed conveying device is arranged on the top of the welding table, a clamping device is arranged on the top of the welding table, and a collecting device is arranged on the top of the welding table to slow down the conveying speed of the conveyor belt, so as to prevent the cable bridge from colliding and being damaged due to excessive conveying speed of the conveyor belt.

The present invention belongs to the technical field of flood prevention and water retaining, and specifically discloses a non-powered flip-type flood prevention baffle device. It comprises: a base fixedly arranged on the ground, an arc-shaped pressure plate and a leaf spring mechanism arranged on the base, the other end of the leaf spring mechanism is connected to a water retaining plate with a hollow structure, and a locking mechanism is also provided on the base, which is used to lock the water retaining plate when the water retaining plate is in a horizontal state, and a limit column for limiting the maximum flipping angle of the water retaining plate. The present invention uses a leaf spring and an arc-shaped pressure plate as the rotating shaft of the flipping movement of the water retaining plate, provides torque for the flipping movement of the water retaining plate, so that the water retaining plate can flip according to a predetermined arc without deviation, and at the same time, the leaf spring mechanism plays the role of sealing and retaining water at the bottom of the device, and cooperates with the locking mechanism to realize automatic upward flipping and water retaining under flooding conditions without power, and automatically returns to the position and locks after the water recedes, without affecting traffic, and has a simple structure and strong flood prevention ability.

The invention belongs to the technical field of solar cell materials, and discloses a GaAs solar cell with a moth-eye micro-nano structure anti-reflection layer and a preparation method of the GaAs solar cell in order to enhance the solar spectrum utilization rate and improve the photoelectric conversion efficiency of the solar cell. The method comprises the following steps: growing a thin film with a nano-column structure on a Si substrate with a SiO2 layer in an MBE autocatalytic growth mode, spin-coating PMMA on the surface of the thin film, and transferring the nano-column structure to a GaAs and carbon nanotube heterojunction solar cell through a two-dimensional material wet transfer technology to prepare the solar cell with the moth-eye micro-nano structure anti-reflection layer. Compared with a nanoimprint lithography technology and a photolithography technology, the method provided by the invention is more convenient to operate and more environment-friendly, and does not need to use some harmful gases and harmful chemicals to etch the micro-nano structure. According to the GaAs heterojunction solar cell with the moth-eye bionic micro-nano structure anti-reflection layer prepared by the method, the material used by the anti-reflection layer is not limited, and the utilization rate of sunlight can be remarkably improved, so that the photoelectric conversion efficiency of a device is remarkably improved.

The invention discloses thick-wall metal plate cutting equipment, and relates to the technical field of metal plate cutting, the thick-wall metal plate cutting equipment comprises a working platform, a supporting cushion block, a plurality of supporting columns, a longitudinal feeding module, a stand column, a transverse feeding module, a cutting module, a cooling module, a slag cleaning module and a control panel, a plurality of supporting cushion blocks are arranged on the working platform, the longitudinal feeding module is connected with the working platform and fixed to the working platform, the two ends of the working platform are connected with the stand columns correspondingly, the two stand columns are oppositely arranged, and the bottoms of the stand columns are in sliding connection with the working platform and are in threaded connection with the longitudinal feeding module. The top end of the stand column is fixedly connected with the transverse feeding module, the transverse feeding module is connected with the cutting module, the cooling module is arranged on the cutting module, the transverse feeding module is connected with the slag cleaning module, the control panel is connected with the transverse feeding module, and the control panel is fixed to the face, close to the longitudinal feeding module, of the transverse feeding module.

The invention provides a control method and system of an in-aorta balloon counterpulsation system, and relates to the technical field of medical system control. According to the method provided by the invention, through the pre-trained neural network model, the target cardiac cycle of the target user can be quickly and accurately determined according to the historical electrocardiogram monitoring data of the target user under the condition that the target user has arrhythmia or the electrocardiogram signal quality is poor; according to the embodiment of the invention, the target cardiac cycle of the IABP system is obtained, and then inflation and deflation control of the air bag of the IABP system is realized according to the target cardiac cycle, compared with a mode of controlling the IABP system through electrocardio triggering in related technologies, the method provided by the embodiment of the invention can effectively improve the safety and effectiveness of the IABP system, and the use risk of a user is reduced.

The invention relates to the technical field of nano material preparation, in particular to a hydrophobing agent and a method for preparing hydrophobic white carbon black at low temperature by adopting the hydrophobing agent. Comprising the following steps that 1, 3-divinyl-1, 1, 3, 3-tetramethyldisilazane and 1, 1, 1, 3, 5, 5, 5-heptamethyltrisiloxane are mixed, a Pt catalyst is added, the mixture enters a micro-channel reactor, a heating reaction is carried out, the mixture enters a reaction kettle to continue a stirring reaction, reaction heat in the micro-channel reactor is used for heating the reaction kettle, and unreacted components are removed; distilling to obtain a water repellent agent, and recycling a kettle substrate as a catalyst; the preparation method comprises the following steps: mixing white carbon black and a hydrophobic agent under the protection of nitrogen or inert gas, and heating and stirring to obtain the hydrophobic white carbon black. The hydrophobic agent disclosed by the invention contains a silicon-nitrogen bond with good reaction activity and is rich in lipophilic trimethylsiloxy. The silicon-nitrogen bonds can be effectively reacted and grafted with the surface of the white carbon black to form stable chemical bonding.

The invention provides a manufacturing method of a flexible product, which comprises the following steps: a first film layer is formed on a substrate, a second film layer is formed on the first film layer, and the surface binding force between the first film layer and the second film layer is smaller than the surface binding force between the first film layer and the substrate; and then the second film layer is separated from the first film layer in a mechanical separation mode according to the difference of binding force between different film layers, and the flexible product comprising the second film layer is obtained. According to the invention, the aim of mechanically separating the film layer from the substrate is fulfilled by utilizing the binding force difference between different film layers and manufacturing a film layer interface with low binding force, so that the danger caused by a chemical mode of corroding and releasing a sacrificial layer through a high-risk chemical drug and the limiting influence of some materials are avoided; and compared with a mode of directly and physically tearing the film from the substrate for separation, the method provided by the invention needs smaller separation force, so that the film layer deformation caused by mechanical separation is smaller, and meanwhile, the thinner film layer can be separated without film layer breakage caused by tearing.

The invention discloses a safety control method and device for an intelligent cockpit voice interaction system. The method comprises the steps that vehicle dynamic information and driver dynamic information are acquired; judging whether the driver is in a fatigue or sleep state or not according to the dynamic information of the driver so as to evaluate the dangerous state of the driver; according to the vehicle dynamic information, the state of the vehicle and whether dangerous conditions exist around are detected, and therefore vehicle dangerous state evaluation is achieved; according to the driver and vehicle dangerous state evaluation result, the intelligent cockpit voice interaction system is switched to a corresponding working mode, the working mode comprises a common working mode, a safe working mode and a dangerous environment mode, in the common working mode, the vehicle receives all voice commands and executes corresponding operation, and in the dangerous environment mode, the vehicle receives all the voice commands; in the safe working mode, the vehicle receives a voice command of a registered person and executes corresponding operation, and in the dangerous environment mode, the vehicle receives physical key triggering and executes corresponding operation in cooperation with a voice command of a driver.

The present invention discloses a nickel-doped enhanced aluminum nitride ceramic and a preparation method thereof, and relates to the technical field of ceramic additive manufacturing. In the preparation method of the nickel-doped enhanced aluminum nitride ceramic provided by the present invention, the nickel powder is first demagnetized at high temperature before nickel is added, thereby avoiding the influence of the ferromagnetism of nickel metal on the performance of the ceramic substrate; further introducing an oxide-type sintering aid can reduce the sintering temperature of the nickel-doped aluminum nitride, thereby avoiding the high temperature required during sintering causing certain hidden dangers to the equipment and workers, and helping to prepare aluminum nitride ceramics with high density, fine grains, and uniform microstructure; (3) In the preparation method of the present invention, by post-processing the sintered aluminum nitride ceramics with hot isostatic pressing, its bending strength can be further improved, thereby preparing the nickel-doped enhanced aluminum nitride ceramics.

The present invention discloses an intelligent manhole cover, which includes a manhole body, one end of which is a manhole opening; a cover plate, which is arranged on the manhole opening of the manhole body; a first driving mechanism, which includes a driving member, a first sleeve column and a second sleeve column, which can be relatively movable in a vertical direction, the upper end of the first sleeve column is connected to the cover plate, and the lower end of the second sleeve column is connected to the manhole body; the driving member includes a first magnetic member and a second magnetic member arranged to be relatively attracted, an elastic component compressed and connected between the first sleeve column and the second sleeve column, and an electromagnetic component for generating a magnetic force when power is turned on to release the magnetic attraction state of the first magnetic member and the second magnetic member; when the magnetic attraction state of the first magnetic member and the second magnetic member is released, the elastic component drives the second sleeve column to rise in a vertical direction so that the cover plate opens the manhole opening. The technical solution of the present invention can realize the automatic opening of the manhole cover, and has the effects of energy saving and safety.

The utility model relates to the technical field of plate bending machines, and discloses a composite pipe plate bending machine which comprises a plate bending machine body, a feeding plate is arranged at a feeding port of the plate bending machine body, a plurality of rotating rollers arranged at intervals are rotatably installed in the middle of the feeding plate, a centering limiting mechanism is arranged on the feeding plate, and the centering limiting mechanism is connected with the rotating rollers. And a pressing mechanism is arranged at the top of the centering limiting mechanism. According to the plate bending machine, the feeding plate and the centering limiting mechanism are arranged at the feeding port of the plate bending machine body, the plate is limited in the vertical direction through the feeding plate, and the plate can be limited in the horizontal direction through the centering limiting mechanism, so that the plate can rapidly and accurately enter the plate bending machine body to be machined, and the situation that the machining quality of the plate is affected due to deviation of the plate is prevented; and meanwhile, the pressing mechanism is additionally arranged at the top of the centering limiting mechanism, so that the tail end of the plate can be prevented from tilting greatly in the feeding process of the plate, and certain danger caused by the plate to workers is prevented.

The invention discloses a gate channel capable of preventing fare evasion and belongs to the technical field of gate channels, the gate channel comprises a base, a channel gate is fixedly connected to the top of the base, a first storage groove is formed in the right side surface of the channel gate, and a placement groove is formed in the front of the first storage groove and located in the right side surface of the channel gate; a tripod brake bar is rotationally connected into the containing groove, one end of the tripod brake bar penetrates through the inner wall of the containing groove, and the end, penetrating through the inner wall of the containing groove, of the tripod brake bar is fixedly connected with a gear. In the invention, the passengers can be blocked through the height of mutual superposition of the baffle plate and the blocking plate while identity verification and ticket checking of the passengers are not influenced, so that the possibility that the passengers climb over the gate to evade the fare is effectively and fundamentally reduced, further dangerous accidents and adverse effects are avoided, and the safety of the passengers is improved. The safety of other passengers and passengers who want to evade fare is protected, and meanwhile the stability and smoothness of ticket checking of a gate channel can be improved.

The utility model relates to the field of feed production, and particularly discloses an integrated closed solid-liquid mixed feed production line which comprises a main material adding device, at least one small material adding device, at least one liquid material adding device, a mixer and a finished product subpackaging device, the liquid material adding device comprises a liquid storage tank, a liquid inlet pump, a liquid metering scale and a liquid spraying system which are connected in sequence; an inlet of the mixing machine is respectively connected with the main material adding device, the small material adding device and the liquid material adding device; the finished product sub-packaging device comprises a finished product bin, a discharging screw rod and a sub-packaging weighing packaging machine which are connected in sequence; and an inlet of the finished product bin is connected with an outlet of the mixing machine. According to the utility model, the main material adding device, the small material adding device and the liquid material adding device are respectively arranged in front of the mixing machine, so that solid-liquid mixed feed production is realized, moisture absorption and caking of soluble materials are reduced, and the small material adding device directly communicated with the mixing machine is arranged to reduce the contact surface between small materials and wet materials.

The utility model discloses a wind power generation blade lifting appliance convenient to adjust, which belongs to the technical field of lifting appliances, and comprises a support frame, the inner wall of the support frame is fixedly connected with a bidirectional hydraulic telescopic rod, the two telescopic ends of the bidirectional hydraulic telescopic rod are fixedly connected with moving blocks, two first wrapping frames are arranged below the support frame, and two second wrapping frames are arranged below the two first wrapping frames. The inner wall of each first wrapping frame is fixedly connected with an electric telescopic rod. According to the convenient-to-adjust lifting appliance for the wind power generation blade, through mutual cooperation of a supporting frame, a bidirectional hydraulic telescopic rod, moving blocks, a first wrapping frame, an electric telescopic rod, a second wrapping frame, a damper, a clamping plate, a back-jacking spring and an anti-skid pad, the two moving blocks can slide in the supporting frame in a manner that the two moving blocks get close to each other or get away from each other through stretching out and drawing back of the bidirectional hydraulic telescopic rod; and the electric telescopic rod is electrified to stretch out and draw back, so that the relative positions of the first wrapping frame and the second wrapping frame can be controlled.

The invention belongs to the technical field of automobile braking, and discloses an unmanned vehicle hydraulic braking manual pressure relief device which comprises a liquid storage part and a plunger pump, a cavity for storing brake liquid is formed in the liquid storage part, the plunger pump communicates with the cavity, and a first conveying part and a second conveying part are installed at the liquid outlet end of the plunger pump; the pressure relief device further comprises a front connecting piece and a rear connecting piece which are used for being connected with a tire, and a front braking piece and a rear braking piece which are used for clamping or loosening are connected to the connecting piece and the rear connecting piece respectively. Conveying channels for conveying brake fluid along a preset path are formed in the first conveying part and the second conveying part, after a braking system of the unmanned vehicle goes wrong, the chassis braking system of the unmanned vehicle can be quickly relieved, the unmanned vehicle leaves a motor vehicle lane or a sidewalk to an open area, and the safety of the unmanned vehicle is improved. And dangers caused by on-site maintenance of the unmanned vehicle on motor vehicle lanes and sidewalks are avoided.

The utility model relates to the technical field of building hoisting equipment, and discloses frame type hoisting equipment for blasting demolition of a high-rise building, which comprises a fixed base, the upper surface of the fixed base is fixedly connected with a fixed rod, the upper end face of the fixed rod is rotatably connected with a rotating head, the side wall of the rotating head is fixedly connected with a supporting arm, and the side wall of the supporting arm is fixedly connected with a connecting rod. A moving mechanism is fixedly connected to the left end of the supporting arm, a motor box is fixedly connected to the side wall of the moving mechanism, a servo motor is started to drive a reciprocating lead screw to rotate, the reciprocating lead screw drives a lead screw block to move, the lead screw block drives a mounting block to move, and the mounting block drives a pulley to rotate; the sliding friction force between the mounting block and the tail plate is reduced through the pulley, so that the mounting block smoothly slides in the inner wall of the pulley groove, and the mounting block moves to drive the supporting frame and the bearing block to move, so that the stable operation of the crane is ensured, the danger of toppling or inclining during hoisting of the crane is avoided, and the construction safety is improved.

The invention relates to a preparation method of a pure-phase sodium ion battery positive electrode material, the positive electrode material is a carbon-coated ferric sodium phosphate pyrophosphate material, the chemical formula of the ferric sodium phosphate pyrophosphate is NaaFeb (PO4) cP2O7, 3 < = a < = 4, 2 < = b < = 4, and 1 < = c < = 3; the preparation method comprises the following steps: weighing the sodium carbonate, the iron phosphate, the sodium dihydrogen phosphate, the citric acid and the dispersing agent according to a stoichiometric ratio; the preparation method comprises the following steps: dissolving sodium carbonate and citric acid in a solvent for reaction to obtain first slurry; mixing the first slurry, iron phosphate, sodium dihydrogen phosphate and a dispersing agent to obtain second slurry; drying the second slurry to obtain a precursor; and pre-sintering the precursor in a protective gas atmosphere, and then continuously heating for sintering to obtain the positive electrode material, according to the method, the pure-phase ferric pyrophosphate sodium positive electrode material can be obtained, and the electrochemical performance of the positive electrode material is effectively improved.

The invention provides a solid acid catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: carbonizing lignin to obtain a carbon-based carrier; placing the carbon-based carrier in a plasma modification instrument, vacuumizing, and then introducing gas for activating treatment to obtain a lignin carbon-based material; and carrying out sulfonation treatment on the lignin carbon-based material to obtain the solid acid catalyst. The catalyst has the advantages of being short in preparation time, small in pollution, high in catalytic efficiency, recyclable and the like, can be applied to catalytic conversion of a fructose solution into 5-hydroxymethylfurfural, the yield can reach 70%-90%, corrosion of an inorganic acid catalyst to reaction kettle equipment is avoided due to use of the solid acid catalyst in the reaction process, and the catalyst is an environment-friendly catalyst.