229 results about "Low load" patented technology

The invention discloses a high-precision transformer fault detection method and system, relates to the technical field of transformer detection, is used for solving the problems of insensitive fault characterization and delayed diagnosis under a light load condition, and judges whether to enter a load judgment mechanism or not by acquiring input side access voltage information and counting low-load accumulated duration. When entering a load discrimination mechanism, detecting the start-stop behavior of a load branch and the temperature rise trend of a winding, calculating a light load index, identifying a light load state, carrying out region division on an iron core, collecting magnetic flux density data, and calculating iron loss balance characteristics aiming at iron loss deviation which is easy to occur under a light load condition; the insulation degradation coefficient is calculated by fusing the oil temperature peak value and the dielectric loss factor, and the abnormal index is generated with the iron loss balance characteristic, so that the early warning of the early hidden fault of the transformer can be realized in a light load scene in which the traditional temperature rise and current indexes are insensitive, and the operation reliability and maintenance efficiency of the transformer in a power distribution system are improved.

The utility model relates to the technical field of anti-loosening bolts, in particular to an anti-loosening bolt for a wind driven generator, which comprises a bolt and a nut, the bolt comprises a head and a screw rod, the nut is in threaded connection with the surface of the screw rod, a sliding groove is arranged on the surface of the screw rod, and a circular ring base plate is sleeved on the surface of the screw rod. And a limiting block is fixedly connected to the inner arc surface of the circular ring base plate, the limiting block is clamped in the sliding groove, an inserting groove is formed in the surface of the circular ring base plate, and a locking mechanism is fixedly connected to the surface of the nut. The bolt and the nut can be fixed through matching of the circular ring base plate and the locking mechanism on the nut, so that connection between the bolt and the nut is firmer, the problem of bolt loosening caused by various complex working conditions such as vibration, high and low load changes and strong wind impact in the operation process of the wind driven generator can be effectively solved, and the service life of the wind driven generator is prolonged. The reliability of bolt connection is greatly improved, and stable connection of all parts of the wind driven generator is ensured.

The automobile part torsional fatigue test bench comprises a bench body, a driving mechanism is arranged at one end of the top surface of the bench body, a workpiece carrying structure is arranged at the other end of the top surface of the bench body, a force application structure is arranged at the position, close to the driving mechanism, of the top surface of the bench body, and the driving mechanism comprises a driving bin. The end, away from the force application structure, of the driving bin is fixedly connected with a servo motor, and the two sides of the middle of the interior of the driving bin are fixedly provided with a cycloidal-pin wheel speed reduction assembly and a planetary speed reduction assembly correspondingly. The driving mechanism is driven by the servo motor, a huge oil supply hydraulic system does not need to be used, the occupied area is small, the output torsion load can be switched through the cycloidal-pin wheel speed reduction assembly or the planetary speed reduction assembly, the load output through the planetary speed reduction assembly is low, constant loads can be repeatedly applied to a workpiece for a long time, and the working efficiency is improved. The output load of the cycloidal-pin wheel speed reduction assembly is high, destructive testing of the maximum load can be carried out, and two detection modes can be considered.

The invention discloses a sectional type variable stiffness mattress spring and a preparation method thereof and a mattress, the spring is formed by winding a wire rod with an I-shaped section, the spring body is sequentially divided into a top contact area, a middle support area and a bottom transition area along the axial direction, and the pitches and the sectional dimensions of the three areas are sequentially increased, so that the spring presents a low elastic coefficient of 0.15-0.25 N / mm under a low load of 50-200N, and the spring body has a high elasticity coefficient of 0.15-0.25 N / mm under the low load of 50-200N. And under the high load of 450 to 750N, the high elastic coefficient of 0.4 to 0.5 N / mm is shown. According to the invention, through unique material cross section, segmented variable parameter structural design and composite heat treatment and surface coating processes, excellent fitting flexibility of the mattress under low load and strong supporting performance under high load are synergistically realized, and the problem that the traditional mattress collapses when being soft and is rigid when being supported is effectively solved; and meanwhile, the advantages of high bending resistance, good durability, silence and the like are achieved.

The invention discloses an abnormality monitoring method and system for a fuel cell stack. The operation process of the fuel cell stack is divided into an open circuit stage without load access, an activation polarization stage started by a low load and a normal operation stage started by a high load in advance; the abnormity monitoring method comprises the following steps: in an open-circuit stage, collecting open-circuit voltage of a battery in real time, if the open-circuit voltage is higher than a first set value under continuous preset times, judging that the open-circuit stage is abnormal, and triggering an early warning prompt; and in the activation polarization stage, calculating the output power slope of the galvanic pile, if the power slope is smaller than a second set value within the specified time, judging that the activation polarization stage is abnormal, and processing based on a preset action. According to the technical scheme, different stages of the fuel cell stack can be monitored in a targeted manner, the fault handling efficiency is improved, and the safety and stability of stack operation are improved.

The invention provides a supercritical unit low-load deep peak regulation system and method, and relates to the field of thermal generator sets, and the supercritical unit low-load deep peak regulation system comprises an instruction analysis and pre-control module, an energy redistribution module, a combustion steady-state module, a parameter cooperation module and a state backtracking and self-gain module. According to the application, through the arranged instruction parsing and pre-control module, the power grid load instruction is parsed and converted into a set of accurate equipment action time sequence list, the instruction feature recognition unit in the instruction parsing and pre-control module performs mode recognition on the load instruction, and the strategy generation unit calls the preset strategy template according to the mode, so that the power grid load instruction is analyzed and converted into the accurate equipment action time sequence list. Action instructions which face all execution units of the whole system and are arranged in a wrong sequence on a time axis are generated, and conversion from passive response to active pre-control is achieved.

This invention belongs to the field of mechanical dynamics technology, and discloses an improved method, medium, and electronic device for load-bearing contact analysis of spiral bevel gears. Based on the tooth contact analysis method, the geometric parameters of the tooth surfaces of the large and small gears are obtained, a load-bearing contact analysis model of the spiral bevel gear pair is constructed, and the overall compliance matrix, overall contact compliance matrix, and local contact compliance matrix of the tooth surface are calculated. A deformation compatibility iterative equation is established, its ill-conditioned nature is analyzed, and a preprocessing matrix is ​​established to improve the deformation compatibility iterative equation. After improvement, the time-varying meshing stiffness and tooth surface load are solved. Based on the tooth surface load, the principal curvature of the tooth surface of the large and small gears is calculated using the Euler analytical method and the principal direction is determined. The contact stress is then solved using Hertz contact theory. This method improves upon the problems of traditional tooth load-bearing contact analysis methods, which suffer from low accuracy and efficiency due to the ill-conditioned nature of the contact compliance matrix under low load conditions and the reliance on numerical differences for curvature calculation.

This invention discloses a novel, low-load, high-efficiency thermoelectric decoupling heating system. The system is characterized by replacing the high-pressure bypass section with an extraction section. This extraction section extracts steam from the middle of the superheater and uses this steam to heat the secondary air or drive the induced draft fan. Compared to existing technologies, this invention, after heating the secondary air or driving the induced draft fan, returns the steam to the cold section, thus overcoming the problem of limited extraction capacity in conventional systems. It also allows for changes in the coal-to-water ratio within the boiler under low load conditions, increasing the outlet steam temperature of the superheater and reheater under low load conditions, and avoiding the widespread problem of underheating of main steam and hot reheat steam under low load conditions.

The invention discloses a 5GMEC task unloading method, system and device based on optimal time delay in the Internet of Vehicles, and relates to the technical field of 5G communication. The method comprises the following steps: firstly, calculating a local time delay required by a vehicle operation task in local operation so as to determine whether a current vehicle-mounted task can be unloaded or not; screening out an effective roadside unit set according to the load of each roadside unit; for all tasks currently processed by the effective roadside unit set, calculating corresponding MEC processing time delays; and in combination with high and low load parameters of the roadside units, differential strategy processing is implemented when the tasks are unloaded to different roadside units, the total time delay of unloading the tasks to the roadside units is calculated, and the roadside unit with the minimum total time delay is selected for unloading. According to the method, the stability of unloading link quality can be guaranteed to the maximum extent, the success probability of task unloading is improved, heavy traffic burden caused by big data in a 5G Internet of Vehicles system is relieved, and calculation delay and energy consumption of task unloading are remarkably reduced.

This invention discloses a method for testing the anti-coking performance of diesel engine oil in turbochargers. The main design concept of this invention lies in designing a full-process test based on engine operation, including high smoke conditions, low temperature and low load conditions, high temperature and high load conditions, and multiple rounds of cyclic testing to simulate the high and low temperature fluctuations of engine oil. This achieves a comprehensive assessment of the impact of engine oil performance changes on turbocharger coking. Furthermore, engine oil sampling is performed at predetermined stages to monitor relevant physicochemical properties. Further, the turbocharger is disassembled and evaluated after the test procedure, enabling an accurate evaluation of the engine oil's anti-coking performance. This facilitates the matching development of engine oils during engine development and avoids problems such as turbocharger damage and reduced power caused by using unsuitable engine oil. This invention comprehensively covers soot dispersion, high-temperature shear resistance, and temperature oscillation, providing significant guidance for the comprehensive evaluation of engine oil's anti-coking performance.

The plunger pump comprises a pump body, a high-pressure cavity, a low-pressure cavity and a pressure regulating valve, the high-pressure cavity, the low-pressure cavity and the pressure regulating valve are arranged in the pump body, a mounting part is arranged on one side of the pump body, a mounting groove is formed in the mounting part, a first flow channel and a second flow channel are formed in the side wall of the mounting groove, the first flow channel is communicated with the low-pressure cavity, and the second flow channel is communicated with the low-pressure cavity. The runner II is communicated with the high-pressure cavity; a choke plug is inserted in the mounting groove, and a first circulation groove and a second circulation groove are formed in the choke plug. A steel ball is arranged in the first circulation groove, a supporting ring is arranged in the mounting groove, a placing ring groove is formed in the position, corresponding to an inlet of the first flow channel, of the bottom of the mounting groove, a spring is placed in the placing ring groove, the spring penetrates through an inner hole of the supporting ring and extends into the first circulation groove, and the top end of the spring abuts against the steel ball. The low-load soft start circuit can realize low-load soft start.

The present application belongs to the technical field of fluid machinery electronic control, and relates to a pilot type electronic unloading valve, which adopts a layout form of non-contact high-pressure gas for main electronic components, effectively improves the working reliability of the electronic unloading valve, adopts an external quick plug assembly overall design type, effectively achieves quick and flexible installation, and reduces the production cost and the later operation and maintenance cost, adopts an advanced pilot type unloading mode, and realizes the high working reliability and long service life of the electronic unloading valve in principle. Only a weak current or even no current is needed, and only a weak elastic return spring is needed, so that the main unloading pipeline can be long-term normally closed, that is, the unloading valve is weak current normally closed, thereby, the low load design principle can be used to handle mechanical parts and electronic components, so that the working reliability of the unloading valve can be improved. The present application also installs the electronic unloading valve on the compressor system, effectively guarantees the working reliability of the compressor system, and can reduce the production cost.

The invention relates to the field of construction materials, in particular to a backfill material composed of mixed industrial waste applied to a low load level, the backfill material composed of the mixed industrial waste applied to the low load level comprises broken tempered glass, old plastic and waste tire rubber particles according to the volume ratio of 6: (1-1.5): (2.5-3), the water content of the backfill material is 0.7-1.2%, and the water content of the backfill material is 0.5-1.5%. And when the backfill material is dumped to the backfill area, the ground clearance of the backfill material is 1.5-2m. The backfill material composed of the mixed industrial waste materials applied to the low load level is composed of pure waste materials, the waste materials meet environmental safety, the backfill material only needs to be directly poured into a backfill area at a certain height during use, the compaction degree can be larger than 90% without being compacted, the vertical strain of a formed backfill body under the load of 6 kPa is smaller than 0.42%, and the vertical strain of the backfill body under the load of 6 kPa is smaller than 0.42%. And the method can be applied to low-load-level engineering parts such as municipal pipe gallery backfilling and park greenway lower cushion layers.

In an internal combustion engine equipped with a variable compression ratio mechanism, abnormal noises caused by combustion pressure in a specific low-load operating range are appropriately suppressed by controlling the advance angle limit of the ignition timing. [Solution] The noise suppression advance ignition limit value calculation unit 101 includes a map search unit 102, an advance ignition limit value selection unit 103, a change rate limit unit 104, a change rate limit determination unit 105, and a dummy value output unit 106. When the region determination unit 107 determines that the operating point is within the noise region, it outputs the noise suppression advance ignition limit value OPDADV via the select-low unit 110. The final ignition timing is limited to the retarded side of the MBT point by this advance ignition limit value. The map search unit 102 includes an advance ignition limit value map for each engine state label ETDST corresponding to the compression ratio. When the compression ratio is high, the ignition timing is limited to the retarded side even more.

The application discloses a layered collaborative control method for auxiliary deaerator pressure stabilization of a molten salt steam generator, builds an auxiliary optimization control layer on the original coordination control system of the unit, and forms a layered collaborative architecture of "MPC optimization decision-CCS execution tracking". The upper layer calculates and rolls over the optimal set values of the molten salt steam pressure, the deaerator pressure and the feedwater temperature in real time based on model predictive control (MPC); the lower layer realizes fast and stable tracking of the set values through three control loops of cascade-ratio control, three-impulse collaborative control and PID control embedded in CCS, and is seamlessly coordinated with the original feedwater and combustion control logic of the unit. The application effectively solves the problems of multivariable strong coupling, large response inertia and strong mode switching impact of the coal-molten salt coupling system in deep load regulation, significantly improves the load response speed, operation safety and low-load economy of the unit, and enhances the accommodation capacity of the power system to new energy.

The application relates to the technical field of power systems, and discloses an industrial park load balancing method and system for promoting new energy consumption, wherein the method comprises the following steps: inputting new energy power generation data and industrial park load data into a time sequence prediction model to obtain power consumption balance state prediction results of each subregion; calculating the load utilization rate of each subregion based on new energy power generation resource quantization data and industrial park load resource quantization data, and determining a high load subregion and a low load subregion in the subregion according to the load utilization rate; obtaining a to-be-migrated task list of the high load subregion and an idle resource list of the low load subregion, and performing optimization matching processing on to-be-migrated tasks in the to-be-migrated task list and idle resources in the idle resource list to obtain a resource allocation optimization result; and executing a cross-region task migration instruction generated from the resource allocation optimization result. The method improves the new energy consumption efficiency.

This application discloses a task allocation method, apparatus, and related products. The task allocation method is applied to task allocation nodes. Based on the load of a first service node and the load of a second service node, the first and second service nodes are sorted according to the lowest load, resulting in a node sorting queue. If the node position of the first service node in the node sorting queue is before the node position of the second service node, the task to be allocated is assigned to the first service node; conversely, if the node position of the second service node in the node sorting queue is before the node position of the first service node, the task to be allocated is assigned to the second service node. Thus, this application can determine the service node to which a task will be assigned based on the calculated load of the service nodes, thereby avoiding the problem of uneven task distribution in related technical solutions to a certain extent and improving task allocation performance.

The invention discloses a backrest assembly and a seat, and the backrest assembly comprises a seat frame provided with a guide groove; the waist frame is movably connected to the chair frame; the driving unit comprises an electric push rod and a transmission assembly, a driving shaft of the electric push rod and the guide groove are obliquely arranged and form an included angle smaller than 90 degrees, one end of the transmission assembly abuts against the groove wall of the guide groove, and the other end of the transmission assembly is connected with the waist frame and can drive the waist frame to move; the electric push rod can drive one end of the transmission assembly to slide in the guide groove so as to drive the waist frame to move to a preset position, and then the electric push rod drives the waist frame to reciprocate. The supporting and massaging integrated function is integrated, the lever transmission mechanism is utilized, the waist frame is accurately pushed to the supporting position with low load, then the mechanism is reused to drive the waist frame to press the waist in a reciprocating mode, accurate and powerful massaging is achieved, efficient supporting and active relieving are deeply fused, and the health function of the seat and the user experience are remarkably improved.

An air conditioning device is provided in which, within a comparatively compact unit where a condenser is arranged below an evaporator, the energy used is controlled within a current limit for the power supply, thus enabling efficient use of air conditioning capacity (cooling capacity). The air conditioning device 100 comprises a housing 60 containing a refrigerant circuit R with a compressor 10, a condenser 20, an evaporator 30, and an expansion device 40, and a control device 50. The control device 50 includes a unit 502 for determining the upper operating limit, a unit 503 for determining the speed command value, and a compressor speed control unit 506. The unit 502 for determining the upper operating limit performs a control operation.to determine an upper operating limit Rrmax of the compressor 10 according to a load of the compressor 10, wherein the unit 503 performs a control for determining the speed command value, whereby, in the case of a relatively low load, it determines a speed command value Rc according to a setpoint discharge temperature Ttgt and a current speed Rnow of the compressor 10, and in the case of a relatively high load, it determines the current speed Rnow or the upper operating limit Rrmax as the speed command value Rc, wherein the compressor speed control unit 506 controls the drive of the compressor 10 on the basis of the speed command value Rc.

The invention provides a regeneration control method and device for a particle catcher of a vehicle and the vehicle, and belongs to the technical field of vehicle control. Comprising the following steps that information is obtained, load state information of an engine of a vehicle is obtained, the load state information is used for representing whether the engine of the vehicle is in an operation state or not, and the load state information is remote accelerator state information, power takeoff state information or engine load information; state judgment is conducted, specifically, the load state of the engine of the vehicle is determined according to the load state information and the preset mapping relation between the load state information and the load state of the engine; the control is executed, the load state of the engine of the vehicle is high load or low load, and if the load state of the engine is high load, regeneration of the particle catcher is interrupted. When the engine is in a high-load state, regeneration of the particle catcher can be interrupted, and it is avoided that the regeneration of the particle catcher influences power under the conditions of vehicle operation or heavy-load climbing and the like.

The utility model belongs to the technical field of mixing machine especially is a kind of broken material mixing machine, including mixing hopper and equipment storehouse, the side gap is set in one side of mixing hopper, to discharge fast, side sealing piece, the side sealing piece fixedly connected in the outer wall of mixing hopper, to extend discharge path, the side sealing piece with the side gap position corresponds, adjusting plate, the adjusting plate can rotate along the mixing hopper axle by drive mechanism, to adjust the opening and closing of side sealing piece, inclined support, the inclined support is installed below the mixing hopper, to limit the discharge path of side sealing piece;The adjustment of side sealing piece position by adjusting plate can be realized to the low load discharge of material by adjusting the opening and closing of side gap, cooperate the guidance of material by side sealing piece and the support of side sealing piece by inclined support, can effectively increase the dumping discharge distance of material, by changing discharge mode, can effectively reduce the equipment load and the workload of staff.

This invention relates to a method for calculating the actual road emissions of heavy-duty vehicles under remote monitoring. Based on the three-zone moving average window method, a three-zone moving average window model is established using a fixed duration of 300 seconds. The corresponding load ratio is calculated based on the carbon dioxide emissions of each window. The window, moving second by second, is divided into idling, low-load, and medium-high load zones according to the load ratio. Emission values ​​for the three zones are calculated, and it is verified whether the emissions in each zone exceed the limits. The beneficial effects are: This invention solves the current limitation of existing calculation methods for verifying the actual driving emission levels of vehicles after receiving emission data from networked vehicles on a remote platform. It can fully utilize networked vehicle emission data, taking into account emission data under idling and low-load conditions. It has no strict requirements on vehicle load and data continuity, does not distinguish between vehicle types, simplifies the monitoring procedure, and has strong adaptability and wide application range.

The utility model provides a device for slowing down butadiene polymer generation under low load of butadiene device, through increasing the pipeline of butadiene product entering the light removal tower and water scrubbing tower on butadiene product line, butadiene medium feed load becomes larger, the flow rate in the tower becomes larger, the separation efficiency of tray is increased, the polymerization inhibition effect of polymerization inhibitor is increased, the operation parameter is close to the design optimal parameter, can effectively avoid high concentration butadiene on butadiene heavy removal tower lower section, butadiene water scrubbing tower, light removal tower butadiene polymer generation, avoid the butadiene polymer generation due to butadiene polymer generation causes the tray equipment blockage, causes the non - scheduled parking and butadiene polymer generation after the rise and crack equipment, lead to the flammable and explosive butadiene medium exudation caused by fire and explosion accident.

The application provides a control method, device and equipment of an air conditioning unit and a storage medium, and comprises the following steps: detecting whether a condensing side water inlet temperature meets a preset high-low temperature starting condition; if the condensing side water inlet temperature meets the preset high-low temperature starting condition, in a starting stage of a to-be-started compressor, an electronic expansion valve is controlled based on a preset electronic expansion valve opening degree to increase refrigerant flow, and the to-be-started compressor is controlled based on a preset load, so that the to-be-started compressor can slowly increase the capacity of the to-be-started compressor under a lower load. By adopting the technical scheme of the application, the reliable operation of the compressor can be ensured, and the trouble reporting rate is reduced.

The present disclosure provides a control method, a control device, a water chiller and a computer readable storage medium. The control method comprises: in the case that all modules of the water chiller are running or only part of the modules are running, if there is at least one module whose load is greater than a first threshold value and at least one module whose load is less than a second threshold value among all running modules, obtaining a module with the highest load and a module with the lowest load among all running modules, wherein the first threshold value is greater than the second threshold value; calculating a first difference between the highest load and a third threshold value and a second difference between the third threshold value and the lowest load; and in the case that at least one of the first difference and the second difference is greater than a fourth threshold value and a difference between the highest load and the lowest load is greater than a fifth threshold value, performing a load reduction operation on the module with the highest load and performing a load increase operation on the module with the lowest load.

The invention discloses a motorcycle engine AMT (automated mechanical transmission) gear-shifting, cylinder-separating, fuel-cut and torque-reducing control method and system and a motorcycle, and the control method comprises the following steps: a gear-shifting and torque-reducing stage: detecting whether a whole vehicle sends a gear-shifting request, if so, entering a gear-shifting mode, determining a fuel-cut control strategy according to the current load and rotating speed of the engine, and starting a gear-shifting mode; controlling fuel cut-off of a cylinder of the engine according to the fuel cut-off control strategy; the fuel cut-off control strategy comprises the steps that if the engine is in the low-load working condition, fuel supply of the first air cylinder unit is cut off, and the second air cylinder unit is made to maintain basic power with the idling torque; if the engine is in the high-load working condition, fuel supply of the first air cylinder unit is cut off; then detecting whether the torque of the engine is reduced to a target value or not, if not, cutting off the fuel supply of the second cylinder unit when the engine enters the next working cycle, and recovering the fuel supply of the second cylinder unit after maintaining the fuel cut-off duration D; and in the gear shifting recovery stage, whether gear shifting is completed or not is detected, and if yes, fuel supply of the first air cylinder unit is recovered.

The application provides a guide device for inhibiting vortex band and cavitation of a draft tube and a control method thereof, comprising a cross-shaped guide structure arranged in a straight conical section of a draft tube of a water turbine, and a runner arranged above the straight conical section; the cross-shaped guide structure comprises a center body, two guide plates and a fixing part; the center body is located directly below a draft cone of the runner, has a length consistent with that of the straight conical section of the draft tube, and comprises an upper funnel-shaped part, a middle columnar part and a lower conical part; the cross-shaped guide structure is combined with the segmented center body; the center body can effectively inhibit columnar vortex band under high load conditions; the cross-shaped guide plates can specifically inhibit spiral vortex band under low load conditions; meanwhile, the water flow state is optimized, water flow separation is reduced, cavitation is effectively inhibited, draft tube pressure pulsation and unit vibration are reduced, blade damage is avoided, the service life of the unit is prolonged, and according to the results of relevant simulation tests, the amplitude of the draft tube pressure pulsation can be reduced.

The invention discloses a high-load and high-stability composite aircraft, relates to the technical field of aircrafts, and aims to overcome the technical defects that an existing multi-rotor aircraft is low in load capacity, and a lifting body aircraft is poor in wind resistance and prone to unbalance during unloading. The composite aircraft comprises a lifting body, a multi-rotor system and a connecting structure, the lifting body and the multi-rotor system are in flexible connection, and net lifting force provided by the lifting body corresponds to 80%-100% of the weight (after loads are removed) of a multi-rotor empty aircraft; the multi-rotor system adopts a scene-divided power dynamic adjusting mechanism, the multi-rotor system provides lift force accounting for 0%-20% of the weight of the multi-rotor air aircraft to maintain balance in the no-load state, the multi-rotor system bears all the load weight in the heavy load state, and the balance of the whole composite aircraft system is maintained by rapidly reducing the power to 0%-20% of the weight of the multi-rotor air aircraft in the unloading state. By means of the three-in-one collaborative design of the structure, the strategy and the mechanism, the loading capacity of the multiple rotors is improved by 50%-150%, the large load, the control flexibility and the wind resistance stability are all considered, the multi-rotor multi-rotor unmanned aerial vehicle can be widely applied to large-load hoisting scenes such as plateau material transportation and mountainous area engineering hoisting, and the market blank is filled.