743 results about "Windage" patented technology

This application provides a wind-resistant, stable power generation agricultural-solar hybrid system, including pillars, beams, photovoltaic supports, and photovoltaic panels erected in farmland. The photovoltaic panels are equipped with a buffer mechanism and an overload release device. The buffer mechanism effectively absorbs kinetic energy and reduces the swaying amplitude and speed of the photovoltaic panels through its elasticity, and automatically resets the photovoltaic panels after strong winds. The overload release device protects the photovoltaic panels from damage caused by strong winds. This application overcomes the technical defects of existing static wind-resistant systems, reduces system wind resistance, can withstand super typhoons, provide stable power generation and irrigation, and promote agricultural production.

The invention belongs to the technical field of vehicle fairing control, and particularly discloses a vehicle fairing control method and system fusing oil consumption and wind resistance, a terminal and a medium. Comprising the steps that the speed, fuel consumption parameters and wind pressure parameters of a vehicle in the running process are obtained, and fuel consumption change parameters and wind pressure distribution characteristic parameters are extracted; a multivariable optimization model with the minimum comprehensive energy consumption as the target is constructed; based on the model, a model prediction control algorithm is adopted to solve the optimal control quantity of the attitude of the fairing in a prediction time domain, and control instructions of the angle and the deflection direction are generated; when environmental disturbance or attitude response deviation is detected, dynamically adjusting a target function weighting coefficient or an input penalty factor to correct control output; and adjusting the posture of the fairing in real time according to the corrected control instruction. Through fusion modeling of fuel consumption parameters and wind pressure characteristic information, predictive control and self-adaptive adjustment of the attitude of the vehicle fairing are realized, and fuel economy and aerodynamic performance can be considered under multiple working conditions.

The invention discloses a bicycle rim and a manufacturing method thereof.The bicycle rim comprises an annular rim body, and the rim body comprises a U-shaped supporting part, a connecting part connected with the two ends of the supporting part and two bead beads arranged at the two ends of the outer side of the connecting part respectively; a semi-closed tire groove used for installing a tire is defined by the connecting part and the two tire beads, the width of each tire bead is 5-10 mm, and the tire beads are provided with lightening holes. According to the bicycle rim and the manufacturing method thereof, the width of the bead of the rim is increased, so that riding resistance can be reduced for a road ring, wind resistance can be reduced for a mountain ring, and the problem of tire biting can be effectively reduced; the lightening holes are formed in the bead position, so that the width of the bead is increased, and the self weight of the rim is basically unchanged; the hollow pipe is pre-buried in the bead and integrally formed with the rim, the lightening hole structure is obtained, the conception is ingenious, and the problem that the dead weight of an existing bicycle rim is increased due to the fact that the bead width is increased is effectively solved.

The invention discloses a design method of an array type silencer adaptive to a main ventilation air path between a stator iron core of a hydraulic generator and an air cooler and the array type silencer, and relates to the technical field of suppression or reduction of noise of the hydraulic generator. The method comprises the steps of S1, obtaining aerodynamic noise data and airflow parameters of a main ventilation air path, S2, determining a silencing thought and a micro-perforated plate array core structure according to broadband vortex, discrete rotation, vortex falling and surge noise, S3, determining the boundary dimension and preliminarily calculating the airflow parameters, S4, designing plate parameters in combination with a micro-perforated resonance formula, and S5, calculating the noise of the micro-perforated plate array. S5, performing simulation optimization and S6, accurately accounting airflow parameters, and locking a scheme meeting requirements; the silencer comprises a shell and a plurality of micro-perforated plates, and the multiple layers of micro-perforated plates are arranged in series. The invention has the advantages of no sound absorption material, low wind resistance (the air volume attenuation is less than or equal to 5%, and the pressure loss is less than or equal to 200Pa), the noise of the main wind path is reduced by 5-7dB (A), the service life is long, the operation and maintenance cost is low, and the requirements of the main wind path are met.

The invention provides zero-leakage low-wind-resistance waste gas collecting and discharging laboratory equipment, and relates to the field of laboratory waste gas treatment.The zero-leakage low-wind-resistance waste gas collecting and discharging laboratory equipment comprises a ventilation cabinet, and an air supply box is fixedly installed in the ventilation cabinet. Flexible regulation and control of the air inlet amount are achieved through the synergistic effect of an adjusting plate and an air inlet plate, an air opening can be closed to block impurities in a non-working state, preliminary air filtering is completed through cooperation with a filtering plate, meanwhile, through the linkage design of a lead screw, a moving block, a spring A and a limiting block, the working stability of an air inlet frame is ensured, and the moving block can be driven by rotating the lead screw to compress the spring A; and convenient maintenance of the air inlet frame is realized. The motor A drives the gear set to drive the fan blades to form an effective air curtain, and the defects that traditional equipment is fixed in air volume and insufficient in leakage prevention are overcome. And finally, the flexibility and the stability of waste gas treatment are improved through deep purification of the filter box and discharge of the exhaust fan.

The invention discloses a low-turbulence noise-reduction hydro-generator rotor and a hydro-generator, and relates to the technical field of hydro-generators. Inter-pole wind shields are assembled between salient poles of the rotor, the peripheral cambered surfaces of the inter-pole wind shields are consistent with the peripheral radiuses of the poles, and the inner sides of the inter-pole wind shields are attached to magnetic pole transition surfaces, provided with ventilation holes and fixed through tensioning screws; and the fans at the two ends of the rotor adopt wing-shaped fan blades such as NACA0012 / 0016 / 0018 and the like. According to the hydro-generator, a metal micro-perforated plate is assembled on a main ventilation air path between a stator iron core and an air cooler, the array resistance-resistance performance of a non-sound-absorption material conforms to a silencer type silencer, plate bodies are arranged in series, an air inlet / outlet is bent by 45 degrees, and parameters are accurately designed through a resonance formula. Rotor hidden polarization and precise noise elimination of a main air path are achieved, double noise reduction enables the noise of the whole machine to be smaller than or equal to 65 dB (A), the wind resistance is low (the air volume attenuation is smaller than or equal to 5%), heat dissipation reaches the standard, the structure is stable, the operation and maintenance cost is low, and the requirements of a large-capacity and high-rotating-speed unit are met.

The invention discloses a stake car wind resistance dynamic optimization method and system based on airflow simulation, and belongs to the field of automobile pneumatic optimization. A stake car three-dimensional structure model is constructed, and spatial distribution parameters and surface roughness parameters of a stake component are extracted; establishing a multi-working-condition external flow field simulation model, and obtaining a unit area wind resistance coefficient distribution diagram; constructing a wind resistance sensitivity matrix, and identifying a high-sensitivity component; performing disturbance modeling on the high-sensitivity component, generating a local deformation configuration sample and establishing a simulation model set; parallel simulation calculation is carried out, and wind resistance coefficient and aerodynamic stress data are extracted; based on a multi-objective optimization algorithm, determining an optimal disturbance configuration; outputting a structure adjustment suggestion for guiding dynamic design optimization; according to the method, collaborative optimization of wind resistance reduction and structure safety can be achieved, and the pneumatic performance and the energy-saving level of the whole stake car are improved.

The invention relates to the technical field of automobiles, in particular to a method for correcting automobile wind resistance through a tire database, and the method comprises the steps: collecting geometric parameters such as the section width, the flatness ratio and the tread pattern of a tire, building a parameterized CAD model, carrying out the refined CFD simulation, and obtaining a wind resistance coefficient difference value of a real tire and a smooth tire. And building a mapping database of tire characteristic parameters and wind resistance correction values based on the data, and training a prediction model by adopting a random forest algorithm. In practical application, the wind resistance correction value can be quickly predicted only by inputting tire geometric parameters, and high-precision correction of a bare tire simulation result is realized. According to the method, the consistency of simulation prediction and experimental data is remarkably improved, reliable support is provided for aerodynamic performance evaluation in the vehicle model development stage, the research and development cost is effectively reduced, and the development period is shortened.

The invention provides a wind load overload automatic protection photovoltaic power generation system, which is characterized in that a photovoltaic panel is arranged on a photovoltaic bracket through a non-fixed mounting structure, and the photovoltaic panel is allowed to swing along with wind relative to the photovoltaic bracket when encountering strong wind; the photovoltaic panel is further provided with an overload release device, the overload release device can be used for limiting the photovoltaic panel in a relatively static state facing the sky when no wind or small wind exists, and the overload release device can be used for automatically releasing the photovoltaic panel when the photovoltaic panel encounters strong wind, so that the photovoltaic panel recovers the freedom of swinging along with the wind, automatic wind load overload protection is carried out, and the photovoltaic panel is prevented from being blown down. The technical defects of static wind resistance in the prior art are overcome, the wind resistance of the system is reduced, super typhoon can be resisted, and stable power generation can be achieved.

The invention relates to the technical field of automobile hub manufacturing, in particular to an automobile hub capable of actively reducing wind resistance. Comprising a wheel rim, a spoke frame is fixedly connected to the wheel rim, a transmission rod is fixedly connected to the spoke frame, a friction disc is fixedly connected to the transmission rod, calipers are arranged on the friction disc, the transmission rod is rotationally connected with a limiting plate, a wind blocking frame is fixedly connected to the limiting plate, and a supporting ring is fixedly connected to the wind blocking frame. The supporting ring is rotationally connected with the wheel rim, the transmission rod is slidably connected with extrusion frames distributed in an array mode in the circumferential direction, and tension springs distributed in a mirror image mode are arranged between the extrusion frames and the transmission rod. According to the hub, the air blocking frame is matched with the spoke frame, the air inlet state of the rim is adaptively switched according to the specific driving state of an automobile, so that the hub gives consideration to'low wind resistance 'at high moving speed and'efficient heat dissipation' at medium and low moving speed, and the stability of an automobile braking system is guaranteed while the endurance of the automobile is improved.

The invention relates to the technical field of automobile manufacturing, and discloses a front wall outer plate assembly which is characterized in that a plate body and flow guide covering parts on the two sides are manufactured through an integrated forming process, a traditional multi-part splicing mode is replaced, the number of parts is reduced, the production cost is reduced, meanwhile, the assembly tolerance accumulation risk is reduced, and the attractiveness is improved; secondly, a through hole is formed in the bottom of the mounting groove in a penetrating mode, the bottom of the mounting groove can make contact with the vehicle logo, the contact area is increased, the mounting stability is improved, meanwhile, the closed cavity is broken through the through hole, and the situation that the vehicle logo is difficult to detach due to the negative pressure adsorption effect is avoided; and finally, the flow guide part is connected to the flow guide covering part, the blades can divide the opening into a plurality of air inlets, layered design is achieved, airflow is divided into ordered airflow, wind noise generated by vortexes is reduced, the ventilation effect is improved, wind resistance is remarkably reduced, the flow guide covering part and the flow guide part are detachably connected, replacement of accessories at different flow guide angles is supported, and cost is reduced. And the method has relatively high applicability.

The invention provides a green energy self-power-generation endurance system of a carrier, which comprises a wind power generation assembly, a double-sided photovoltaic panel assembly, a double-sided photovoltaic soft curtain assembly and an air power generation assembly, which can utilize respective advantages to combine or independently carry out green energy power generation. The wind power generation assembly comprises a main air duct and a plurality of one-shaft double-body generators. The main air duct is provided with a closed cabin; a plurality of one-shaft double-body generators are arranged in the main air duct and the closed cabin in a matrix manner; each one-shaft double-body generator comprises a wind power blade arranged on a transmission shaft; the transmission shaft is located in the main air duct, and the two ends of the transmission shaft are rotatably connected to the wind driven generator in the closed cabin. According to the implementation mode, wind resistance airflow generated by driving of the carrier acts on the one-shaft double-body generator through the main air duct, so that each transmission shaft drives the two wind driven generators to synchronously generate electricity. The system has an extremely wide application range and can provide green electric energy for corresponding scenes.

The utility model discloses a kind of heat shrink novel collets, it is related to tool processing technical field, including rear end cylinder and front end cylinder, integrated fixed setting between rear end cylinder and front end cylinder, the inside of rear end cylinder is provided with threaded hole, the inside of front end cylinder is provided with clamping through-hole, threaded hole is communicated between clamping through-hole. The utility model provides a kind of heat shrink novel collets, by the structure cooperation design of whole, so that it can utilize thermal expansion and contraction principle to tool is clamped, realize need not to be grooved, and utilize its slotless design so that it changes the elastic clamping mode of traditional collet fundamentally, greatly improve the roundness of collet inner hole and outer circle, concentricity;In clamping aspect, the contact stress area when clamping is increased;When using in the high-speed rotation scene above 10,000 revolutions, the wind resistance brought by traditional elastic collet groove is greatly reduced.

The invention discloses a tunneling face circulating air early warning method based on wind resistance inversion. Comprising the following steps: S1, abstracting a mine ventilation network into a topological structure, and determining a target branch; s2, air volume and static pressure data of the key nodes are collected through a sensor; s3, constructing a ventilation network nonlinear equation set taking the dynamic wind resistance of the target branch as a key unknown quantity, and forming a wind resistance inversion problem; s4, solving and outputting a current wind resistance estimated value in real time by adopting an iterative inversion algorithm embedded into a physical model; s5, extracting a time sequence change characteristic of the estimated value, and inputting a preset nonlinear risk judgment function to calculate a circulating air risk score; and S6, according to whether the score exceeds a preset threshold, generating a graded early warning signal. The early warning object is converted into the instant ventilation power state from the lagged gas concentration, advanced pre-judgment of the circulating air risk is achieved, and the active early warning and prevention and control capacity of mine ventilation safety is improved.

The utility model provides a fan volute, an air supply structure and an air conditioner, and belongs to the technical field of air conditioners. The fan volute comprises a main body, the main body is of a cylindrical structure, and a first passing opening and a second passing opening are formed in the main body. Along the axis direction of the main body, the inner surface and the outer surface of the main body are respectively provided with an adhesive layer made of a flexible material. According to the fan volute, the wind resistance during operation of the fan can be reduced through the adhesion layer, noise is reduced, and the use experience of a user can be improved.

The invention relates to the technical field of commercial vehicles, in particular to a saddle capable of automatically adjusting a main suspension gap for an electric tractor. Through cooperation of the front-back displacement mechanism, the sliding rail, the sliding plate, the toothed plate, the VCU vehicle control unit, the CAN / Lin communication network unit and the main suspension distance sensor, the effect of automatically adjusting the main suspension gap is achieved, the main suspension distance sensor monitors gap data between main suspension bodies in real time, the gap data are transmitted to the VCU vehicle control unit through the CAN / Lin communication network unit, and the gap data are transmitted to the VCU vehicle control unit through the CAN / Lin communication network unit. The VCU vehicle control unit controls the double-shaft motor to start according to preset parameters and actual working conditions, the double-shaft motor drives the first gear to rotate, the first gear is meshed with the toothed plate to drive the sliding plate to move front and back along the sliding rail, then the saddle body is driven to move synchronously, automatic and accurate adjustment of the main suspension gap is achieved, and the requirement for matching of different transportation working conditions and main suspension is met; driving bumping vibration is reduced, the wind resistance coefficient is reduced, and the vehicle economical efficiency is improved.

The utility model discloses a fan blade ultrathin and deformation resistant material structure which comprises a fan blade plate, the fan blade plate comprises a first wood layer plate, a second wood layer plate, a wood middle layer plate, a third wood layer plate and a fourth wood layer plate, the wood middle layer plate is connected between the second wood layer plate and the third wood layer plate, and the fourth wood layer plate is connected between the second wood layer plate and the third wood layer plate. Therefore, the first wood layer plate, the second wood layer plate, the wood middle layer plate, the third wood layer plate and the fourth wood layer plate are sequentially connected to form the fan blade plate. According to the fan blade, the strength of the fan blade plate is enhanced through the combination mode of the multiple layers of wood of the ultra-thin and anti-deformation material structure, the situation that the fan blade is deformed or broken due to weather or other external force is avoided, and therefore the stability of the fan is improved, wind resistance is reduced, the rotating efficiency of the fan blade is improved, and meanwhile the wood cutting amount is reduced by more than 30%. At present, a new structure with the thickness of about 4.2 mm can replace an old structure with the thickness of 5.4 mm. The new structure with the thickness of about 5.4 mm can replace the old structure with the thickness of 7.2 mm.

The application discloses a lint separating device and a control method of a clothes dryer with the lint separating device. The lint separating device is arranged in a wind channel. The wind channel is provided with an air inlet and an air outlet at two ends respectively. The lint separating device comprises a filtering assembly and a cleaning part. The filtering assembly comprises a first filtering part and a second filtering part. The first filtering part is arranged in a funnel shape. The first filtering part is provided with a discharge port at a base. The second filtering part is arranged to communicate the discharge port with the outside of the wind channel. The first filtering part or the second filtering part is provided with a mesh structure. The mesh structure comprises at least two layers of filtering screens. The adjacent two layers of filtering screens are spaced apart to form a gap. The cleaning part is arranged at one end of the mesh structure close to the air inlet of the wind channel. The cleaning part is arranged to provide flushing gas into the gap. The lint separating device is further provided with a detection part. The computer board of the clothes dryer is arranged to detect the wind resistance or the humidity parameter of the mesh structure, to judge the attachment of the lint, and to clean the lint. The lint attached to the mesh structure is automatically cleaned.

The application discloses a spoiler assembly for a vehicle and the vehicle, the spoiler assembly comprises a base body, a first air guide and a second air guide, the base body is suitable for being connected with the back of the vehicle body, the base body extends in the width direction, the upper surface of the base body is formed with an air guide surface, the first air guide and the second air guide are symmetrically arranged at the two ends of the base body, at least part of the first air guide and at least part of the second air guide protrude from the air guide surface, the first air guide and the second air guide are arranged in the vehicle width direction, wherein the two side edges of the first air guide and the second air guide towards each other are respectively formed with a first air channel wall and a second air channel wall, the first air channel wall and the second air channel wall are arranged away from each other in the direction close to the air guide surface, a first concave air channel is formed between the first air channel wall and the air guide surface, and a second concave air channel is formed between the second air channel wall and the air guide surface, so that the wind resistance of the vehicle can be further reduced.

The invention relates to the field of unmanned aerial vehicles, and particularly discloses an unmanned aerial vehicle folding arm locking anti-loosening structure which comprises an unmanned aerial vehicle body, a connecting arm is arranged on the unmanned aerial vehicle body, a folding arm is hinged to the connecting arm, a propeller connected with a driving system is installed on the folding arm, a first butt joint box is arranged on the connecting arm, and a second butt joint box is arranged on the butt joint box. A second butt joint box matched with the first butt joint box is arranged on the folding machine arm. The multi-stage locking and anti-loosening effect is achieved through movement of the protection assembly, the reliability of the locking function and the flight stability are greatly improved, the abnormal flight phenomena such as out-of-control and aerial photography shaking are reduced, meanwhile, the connection arm and the folding machine arm are integrated through the protection assembly, and therefore the closed environment is formed, the locking structure is hidden inside, and the anti-loosening effect is achieved. Therefore, the flight resistance is reduced, the flight and cruising ability of the unmanned aerial vehicle is improved, the phenomenon that fatigue of the locking structure is aggravated due to wind resistance disturbance is reduced, the overall performance of the unmanned aerial vehicle is improved, and the service life of the unmanned aerial vehicle is prolonged.

This invention discloses a micro-perforated noise-reducing air outlet structure and a hair dryer with the micro-perforated noise-reducing air outlet structure. The micro-perforated noise-reducing air outlet structure includes a shell with an air outlet; a fan assembly installed inside the shell and axially distributing air towards the air outlet; and a micro-perforated component, which is a box-shaped structure with an inner cavity. The micro-perforated component is installed inside the shell and connected to the air outlet. The circumferential sidewall of the micro-perforated component and the inner sidewall of the air outlet are spaced apart to form an air outlet channel. Several micro-holes are opened on the sidewall of the micro-perforated component facing the fan assembly. The inner cavity is connected to the inside of the shell through the micro-holes, and a sound-absorbing component is placed in the inner cavity. The inner cavity of the micro-perforated component constitutes a sound-absorbing cavity that is not air-permeable, achieving a sound-absorbing effect without increasing wind resistance or reducing the air velocity and air pressure.

The invention is suitable for the technical field of commercial vehicle driving control, and provides a commercial vehicle acceleration process dynamic response consistency control method, which comprises the following steps: setting expected dynamic response characteristics by designing a reference model, and estimating slow time-varying parameters such as vehicle mass and equivalent resistance coefficient by using an extended Kalman filter; the static gain difference is eliminated through feedforward compensation; meanwhile, a model with an L1 filter is adopted for reference adaptive control to ensure closed-loop dynamic response, and a disturbance observer is used for compensating the influence of transient gradient and wind resistance disturbance. According to the method, the acceleration dynamic response in the acceleration process can be kept consistent under the condition that the mass, the gradient and the wind resistance of the whole vehicle change, and therefore the driving quality is remarkably improved.

The utility model discloses a sand screening device for building construction, and relates to the technical field of sand screening for building construction, the sand screening device comprises a device main body and a sand screening mechanism, the sand screening mechanism is arranged on the inner side of the device main body, and by arranging the sand screening mechanism, the telescopic length of a hydraulic lifting rod is adjusted, so that the position of a sand throwing plate is conveniently changed according to the sand amount; sand in the sand storage tank is thrown to the sand screening net through the sand throwing plate, the sand is more dispersed and uniform in the falling process through throwing, when the sand is thrown up through the sand throwing plate, the mass stress of large-particle broken stones mixed in the sand is larger, and therefore the large-particle broken stones are thrown farther than the sand, the large-particle broken stones fall into the collecting bin, and the collecting efficiency is improved. And meanwhile, the sand blocking fan blows air inwards, so that the sand is subjected to outward wind resistance, a large amount of sand is prevented from being thrown into the collecting bin, the sand screening effect is ensured, broken stones entering the collecting bin are screened through the sand filtering screen, and normal sand entering the collecting bin can fall into the sand outlet so as to be taken and used together.

The application discloses a vehicle model self-adaptive intelligent front wheel air resistance plate system, and belongs to the technical field of automobile aerodynamics optimization. The vehicle model self-adaptive intelligent front wheel air resistance plate system comprises a parameter sensing layer, an intelligent decision layer and an execution control layer. The parameter sensing layer is used for collecting sensing parameters in real time. The intelligent decision layer is used for calculating a minimum wind resistance coefficient, maximizing a downforce and completing adjustment within a response time constraint, and forming a control instruction based on the sensing parameters by using a deep reinforcement learning algorithm under given vehicle model characteristics and working conditions. The execution control layer is used for executing the control instruction. The front wheel air resistance plate is dynamically adjusted under the action of the execution control layer. The disclosed system realizes dynamic adjustment of parameters such as curvature, thickness and chord length by combining multi-dimensional parameter sensing, intelligent decision and execution control three-layer optimization architecture and self-adaptive curved surface material, so that optimal wind resistance and lift control can be realized under various vehicle models and complex working conditions.

The application discloses a vehicle protection assembly and a vehicle. The vehicle protection assembly comprises a chassis protection piece and a wheel cover. The chassis protection piece is arranged at the bottom of the vehicle to protect the bottom of the vehicle. The wheel cover is arranged at the outer periphery of at least part of the wheel to protect the wheel. The edge of the chassis protection piece is provided with a first connecting part. The wheel cover is provided with a second connecting part. At least part of the first connecting part is connected with the second connecting part. A first limiting part is arranged on the first connecting part. A second limiting part is arranged on the second connecting part. The first limiting part and the second limiting part are matched with each other to limit the relative movement of the first connecting part and the second connecting part. The vehicle protection assembly can completely protect the bottom of the vehicle, improve the protection effect of the bottom of the vehicle, reduce vibration and noise, reduce wind resistance, and has a good visual effect.

The application relates to a heat dissipation technology field of a fuel cell, in particular to a heat dissipation device integrated with anti-vibration and a fuel cell heat dissipation system, which comprises a shell, a fan arranged in the shell and a heat exchanger arranged on the side of the shell, and further comprises two opposite vertical arms arranged in the shell, a plurality of guide vanes corresponding to the gaps between two adjacent fins of the heat exchanger are rotatably arranged between the two vertical arms; the inclined guide vanes can change the flow direction of the airflow, so that the airflow can directly impact the wall surface of the fin, thereby effectively destroying the airflow layer wrapped on the fin due to vibration and not easy to flow, when the vibration intensity increases, the swing amplitude of the guide vanes increases, so that the stripping effect of the airflow on the low-speed airflow layer attached to the wall surface of the fin is more intense, the stripping effect of the airflow layer automatically matches the current vibration condition, the speed regulation mechanism increases the rotating speed of the fan, compensates for the additional wind resistance loss, and ensures that the convective heat exchange efficiency is maintained under different intensity vibration working conditions.

The utility model belongs to the technical field of unmanned pallets, and particularly relates to an electric flow guide cover suitable for an unmanned transportation container pallet, which comprises a flow guide cover arranged above a vehicle body, the flow guide cover is of a streamline structure, and a rotating shaft is arranged at the bottom of the flow guide cover; the two ends of the rotating shaft are movably sleeved with lower shaft seats, and the lower shaft seats are fixedly arranged on the upper surface of the head of the vehicle body. Electric push rods are arranged on the two sides of the flow guide cover and can stretch out and draw back, the upper ends of the electric push rods are fixedly arranged on the upper middle portion of the flow guide cover through bearings, and the lower ends of the electric push rods are fixedly arranged on the side face of the vehicle body through bearings. The flow guide cover is arranged to be of a streamline structure to dredge air flow on the vehicle head and the two sides, wind resistance can be reduced, and power loss can be reduced; in addition, the controller controls the electric push rod to push the flow guide cover to incline forwards, container hoisting operation is facilitated, the flow guide cover is put down backwards when operation is not carried out, the windward area can be reduced, and wind resistance is further reduced.

The invention relates to the technical field of fitness equipment, in particular to a wind resistance rowing machine which comprises a wind resistance device, an operating component, a connecting component and a pull-back assembly, the wind resistance device comprises a fan shell and a fan in one-way transmission fit with the connecting component, and an air inlet assembly of the fan shell comprises a fixed cover and an adjusting cover; a flat-bottom circular groove and an Archimedes spiral air guide groove are formed in the fixed cover, the adjusting cover is provided with a circular convex ring, a flow gathering groove and an Archimedes spiral air inlet groove which penetrates through and is communicated with the groove bottom of the flow gathering groove and the circular convex ring, and the Archimedes spiral air inlet groove and the Archimedes spiral air guide groove are attached to each other and are coaxially arranged; the adjusting cover, the fixed cover, the Archimedes spiral air guide groove and the Archimedes spiral air inlet groove are coaxially arranged, and the adjusting cover is in running fit with the fixed cover. The Archimedes spiral air guide groove and the Archimedes spiral air inlet groove are adopted, so that energy loss and noise can be remarkably reduced, the flow gathering groove is formed in the front end face of the adjusting cover, and air resistance is effectively improved.

A wind-powder balanced distribution method and device for coal pulverizing system of coal-fired unit are provided to solve the problem of uneven distribution of wind-powder of each burner caused by the change of coal quality and output of coal mill during unit peak shaving, which comprises M wind-powder pipelines connected with the outlet of coal mill; each pipeline is divided into n sub-pipelines, and the wind resistance of the same group of sub-pipelines is approximately equal by adjusting the path / length; the ends of the same column of sub-pipelines are combined and directly connected with the burner; an on-line detection device and a wind volume adjusting device are arranged on the combined pipeline; the wind volume control device receives the detection signal and controls the adjusting device to make the wind volume of each combined pipeline equal. By splitting and combining the pipeline to recombine the wind-powder flow, the self-adaptive balanced distribution of pulverized coal is realized simultaneously by only controlling the final wind volume balance, and it is not necessary to detect the pulverized coal concentration in real time. The present application has strong resistance to load / coal quality disturbance and fast response speed; there is no spoiler, and the wind resistance loss is small; the structure is simple and easy to implement. The present application is suitable for flexible peak shaving scene of coal-fired unit of direct-fired pulverizing system.