97results about How to "Simple and reliable structural design" patented technology

The invention provides active and passive type ankle joint rehabilitative apparatus which uses orthogonal coordinates and three degrees of freedom to respectively achieve dorsal stretch and plantar flexion, inversion and eversion, and intorsion and extorsion motions of ankle joints. Every degree of freedom is respectively driven by a motor so that single degree of freedom motions of ankle joints are achieved and the linkage of three motor can achieve complex motions of ankle joints. Force sensors are arranged on pedals of the ankle joint rehabilitative apparatus. During a rehabilitation process, foot motions of a trainee are controlled by detecting stresses of the pedals so that active and passive type ankle trainings are achieved, besides, stress safety protections are performed and secondary injuries to the trainee are avoided. The active and passive type ankle joint rehabilitative apparatus meets rehabilitative training requirements of single degree of freedom and multiple degrees of freedom motions of ankle joints with a simple and reliable structure. Intelligent control, effect evaluation and intelligent protection are achieved due to an adoption of force sensors so that effects and safety of rehabilitative trainings of a patient are guaranteed.

This invention relates to a portable pushing car for checking railway, with such geometric parameter as railway gage, cant, triangle pit, including mechanical structure in I-shaped and three-point framework, electric source, induction testing, controlling and displaying sections. The bearing bogie structure, closing structure, hand button rod, measuring mechanism, controlling system, electric source, displaying box and various sense organs are mounted on main beam crossed on two-railway, three rollers and their mechanism which is both bearing and bogie. On one side of closing mechanism there is position closing wheel, on the other side there is retractable pressure resistant wheel used to make king piece and railway erect, and close to the inside of the railway. This advantages are light weight, stability, slight shaking and corrosion resistance.

The invention relates to a rotary steering well drilling device in the field of well drilling tools. The rotary steering well drilling device is mainly composed of a central spindle, a positioning cylinder, a positioner, a positioning key, a tension spring, a control valve, a control pin, a compression spring, an offset block, a bearing and a sealing device. The central spindle is connected with a drill column and a drill bit. During deflecting, an offset mechanism stretches out, the drill column and a well hole are eccentric, the positioning cylinder and the offset mechanism do not rotate, the drilling pressure and the torque are transmitted to the drill bit through the central spindle, and therefore a deflecting section can conduct rotary and directional drilling. During angle holding, the offset mechanism retracts back, the drill column and the well hole are concentric, the drilling pressure and the torque are transmitted to the drill bit through the central spindle, and therefore an angle holding section conducts rotary drilling. The rotary steering well drilling device is high in deflecting capability, wide in application range and capable of greatly reducing the well drilling cost of a well of a complex structure, and meanwhile the rotary steering well drilling device has the beneficial effects of being simple and reliable in structural design, convenient to machine, large in transmission torque, stable in operation and the like.

The invention discloses a novel intelligent sensor for measuring dust concentration by using a laser backscattering method. A laser device is taken as a light source, the power source is output at constant light intensity through a microprocessor, light is emitted into a measured flue area at a certain slant angle of theta, the light scattered back by smoke dust is focused on a receiver through a focusing lens and then converted into electrical signals, a light filter is additionally provided for preventing the light from being interfered by other parasitic light, and after the signals are subjected to amplification and filtering processing through the microprocessor, the signals are converted into dust concentration. According to the invention, the stability and precision of the sensor are greatly increased, and the maintenance cost is reduced; and the sensor has the advantages of small volume, simple and reliable light path structure design, convenience in installation and maintenance, and the like.

The invention discloses a fresh air unit of a special air conditioning heat pump for capillary radiation and a control method thereof. Cold and heat sources required by the tail end of an air conditioner and treated fresh air are provided simultaneously by employing a set of unit so as to meet the indoor air conditioning demand and the demand on fresh air ventilation volume. According to the technical scheme provided by the invention, the fresh air unit of the special air conditioning heat pump for capillary radiation provides cold and heat sources and fresh air volume simultaneously in the set of unit, so that coordination and unification and intelligent and precise control of an air conditioning cold and heat source system and a fresh air processing system are achieved. The fresh air unit of the special air conditioning heat pump for capillary radiation and the control method thereof disclosed by the invention are efficient and energy-saving, intelligent integration and control are realized, and the unit is stable and reliable to operate.

The invention belongs to the field of mechanical parking devices and discloses a planar moving type modularized intelligent stereo garage. A pre-parking device is arranged under a planar moving type parking platform and provided with a pre-parking module, a conveying direction of the pre-parking module is uniform with that of a lifting conveying mechanism of a lifting device, and the pre-parking module is in linkage with the lifting conveying mechanism. An intelligent vehicle parking and taking appointment making function is realized by the pre-parking device, a vehicle owner can park a vehicle on the pre-parking module to waist for automatic parking and can also make an appointment of vehicle taking, the to-be-taken vehicle is pre-transferred to the pre-parking module from the intelligentstereo garage, and accordingly vehicle parking and taking efficiency is remarkably improved while the intelligent vehicle parking and taking appointment making function is realized. In addition, whenfire accidents of vehicles occur, a traveling mechanism at the bottom of a parking platform module drives the parking platform module to move on rails to quickly transfer vehicles on fire and isolatethe vehicles on fire from nearby vehicles, so that other vehicles can be protected from being jeopardized, and high loss caused by situation escalation is effectively prevented.

The invention relates to a variable diameter wheel, which comprises a rack. The middle part of the rack is provided with a sun wheel, and the circumambient side of the sun wheel is engaged with a plurality of planetary wheels. Each planetary wheel is successively provided with a correspondent screw slide mechanism, a scissors mechanism and a wheel panel. The screw slide mechanism comprises a screwrod, a guiding rod and a slide table sleeved on the screw slide mechanism and the guiding rod. The planetary wheels drive the screw rod to rotate, the rotation of the screw rod leads the slide tableto move along the axis of the screw rod in a reciprocating motion. The slide table moves along the axis of the screw rod to drive the scissors mechanism to open and close, and the wheel panel moves reciprocally along with the opening and closing of the scissors mechanism. The invention also relates to a diameter-changing method for variable diameter wheels. The structural design of the variable diameter wheel is simple and reliable, which realizes the change of the diameter of the wheel, and greatly improves the ability of the vehicle or the mobile robot to cross barriers, and has a broad application prospect.

The invention discloses a cement bag opening and folding device of a cement bag folding machine. The cement bag folding machine comprises a frame. The cement bag opening and folding device is mounted on the frame. The cement bag opening and folding device comprises an upper opening unit, a lower opening unit and a folding unit. The cement bag opening and folding device of the cement bag folding machine is simple in structure, light, quick and capable of overcoming the deficiency of infirm pneumatic suction due to air leakage of unsealed cement bags and meeting the requirements of continuous automatic production.

The invention discloses a cabinet type precise air conditioner with the humidification function and a use method of the cabinet type precise air conditioner. The cabinet type precise air conditioner comprises a wet film humidification module which comprises a return air humidity probe, a water supply pipe, a water supply electromagnetic valve and a controller and further comprises a water sprayer connected with the water supply pipe. A wet film is perpendicularly arranged below the water sprayer. Running water in the water supply pipe is evenly distributed to the wet film through the water sprayer. The running water on the wet film is evaporated after making contact with air, so that the relative humidity content in the air is increased. The wet film humidification module is simple in structure and easy to achieve; due to the fact that a water collecting disc and an indoor fan share the same evaporator, the structural design is simple and reliable, and humidification efficiency is high; and under the condition that the relative humidity of the environment is quite low, intelligent humidification is performed, the humidity range is controlled, normal operation of products in a cabinet data center is guaranteed, and practicality is quite high.

A flexible drilling rod for radial horizontal well drilling comprises two end portion connectors and a connecting shaft which is connected between the connectors; the connecting shaft and the connectors are connected through universal shafts with meshed inner ball teeth and outer ball teeth; the inner ball teeth and the outer ball teeth are locked through a ball head cap; the connectors, the inner ball teeth, the outer ball teeth and the connecting shaft are provided with a common axial through hole; high pressure hoses are sleeved to the through hole; two ends of the high pressure hose are formed into dynamic seal through a bearing, a sealing ring and connector inner walls; the sealing ring is installed between the ball head cap and the outer ball teeth. The flexible drilling rod for the radial horizontal well drilling has the advantages of enabling an underground steering gear to be smoothly passed, enabling torque and bit pressure to be transmitted meanwhile to drive the drill bit to break rocks in a rotating mode, improving the well drilling speed of a horizontal section and circulating well drilling liquid due to the facts that the flexible drilling rod is formed by the plurality of metal universal shafts in a connecting mode, the hose pipe are installed inside the universal shafts, and a drill is connected to the lower end of the flexible drilling rod and the upper end is connected with a pipe column and meanwhile being simple and reliable in structural design, convenient to machine, large in transmitted torque, stable in operation and the like.

The invention provides a prismatic tensegrity type quasi-zero stiffness vibration isolator, and belongs to the field of vibration control. The isolator comprises a spiral spring for providing positivestiffness and a prismatic tensegrity structure for providing negative stiffness; the prismatic tensegrity structure comprises a bearing platform, a base, multiple rod components and multiple rope components; the bearing platform is located above the base; the spiral spring is arranged between the bearing platform and the base in the vertical direction and is in the pre-compressed state; the multiple rod components and the multiple rope components are arranged between the bearing platform and the base and are used for connecting the bearing platform and the base; and each rod component is hinged to the bearing platform and the base. The isolator is simple in structure, convenient to mount and dismount, reasonable in design and easy to adjust, the design of the quasi-zero stiffness vibration isolator is realized by the aid of special mechanical properties of the tensegrity structure, and the isolator can be popularized to be applied to low-frequency vibration control.

The invention relates to a quick release system for a marine flexible vertical riser. The system comprises a tubing system and a riser system connected with the lower end of the tubing system through an annular riser joint, the tubing system comprises tubing and a tubular riser suspension structure fixed to a ship, the tubing and the tubular riser suspension structure are concentrically arranged, the riser joint is arranged at the bottom of the tubing, a plurality of reinforcing ribs are uniformly arranged on the outer wall of the riser suspension structure at intervals, and a clamping jaw locking mechanism similar to an L shape is rotationally connected to each reinforcing rib; the upper ends of the clamping jaw locking mechanisms are connected with the side wall of the riser suspension structure through compression springs, and the clamping jaw locking mechanisms support the riser joint through steel arm beams at the bottom; pressure applying devices used for inwards applying pressure to the clamping jaw locking mechanisms are arranged on the outer sides of the tops of the clamping jaw locking mechanisms.

The invention particularly relates to a rocket composite simulation test device which solves the problem that an existing micro-miniature rocket flight process is affected by environmental forces and sequentially, simulation is difficult. The rocket composite simulation test device comprises an organic glass intake pipeline with a flaring-shaped upper end portion. A rocket carrier is arranged in the organic glass intake pipeline and a high-speed motor is arranged above the rocket carrier. A suspension wire is connected to the output shaft of the high-speed motor and the other end of the suspension wire is connected with the rocket carrier. A laser source which aligns with the tail end of the rocket carrier is arranged beside the high-speed motor. An electromagnet is arranged on the outer side wall of the organic glass intake pipe. A blind hole is formed in the middle of the tail end of the rocket carrier. Dry ice is put into the blind hole and a tail stopper is arranged at one end portion of the blind hole and provided with an exhaust hole. The bottom of the organic glass intake pipeline is connected with a ventilation pipeline in a threaded mode. The other end of the ventilation pipeline is provided with an adjustable air valve which is communicated with the ventilation pipeline. The other end of the adjustable air valve is connected with an air source through a pipeline. Posture variation of the rocket carrier when the rocket carrier is disturbed can be visually observed with the rocket composite simulation test device.

The invention discloses a novel lifting rotation structure. One end of an operating rod is fixedly connected with a handle, and the other end of the operating rod is fixedly connected with a half-moon table and a steel ball locking sleeve; the lower end of the half-moon table is provided with a locking mechanism upper cover; one end of a connecting pipe is connected with the locking mechanism upper cover, and a steel ball locking disc is fixedly sleeved at the other end of the connecting pipe; a spring is arranged in the connecting pipe, a guide mechanism is arranged in the spring, one end of the spring is connected with the locking mechanism upper cover, and the other end of the spring is connected with a pedestal; the steel ball locking disc is arranged in the steel ball locking sleeve, the slope of the steel ball locking disc is provided with steel balls, holes matched with the steel balls are formed on the lower part of the steel ball locking sleeve and positioned on the same horizontal plane, and the upper part of the steel ball locking disc is provided with a groove; a pedestal sleeve is sleeved outside the steel ball locking sleeve positioned on the lower part of the operating rod and connected with the pedestal; and multiple horizontal planes of the pedestal sleeve are provided with holes matched with the steel balls.

The invention discloses a furnace body high-temperature-state rotating sealing structure. Two hard packings and a flexible packing are arranged on a contact face of a furnace body, a pressing ring is buckled on the flexible packing, two sides of the pressing ring are in sliding fit with the hard packings, the hard packings are provided with a sealing cover retaining ring and a sealing cover in a pressed manner respectively, an L-shaped supporting plate is fixedly connected on the sealing cover, an upper guide rod is fixedly connected at the upper end of the supporting plate and slidably matched with a lower guide rod, the lower end of the lower guide rail penetrates the sealing cover, the lower end of the lower guide rod is arranged on the pressing ring in a pressed manner, an adjusting nut is screwed on the upper guide rod, the lower guide rod is provided with a step, and a spring is mounted between the adjusting nut and the step in a pressed manner. By adopting a flexible sealing structure, the furnace body high-temperature-state rotating sealing structure is adjustable in sealability and simple and reliable in structural design, and using performance of equipment is greatly improved.

A mechatronic transmission for transmitting a torque from the drive shaft that can be supported axially on a shaft to an output shaft, the rotational speeds of which can have an arbitrary and variable ratio (stepless transmission). The transmission includes a coupling gear and a torsion spring, with the coupling gear rotatably mounted on the same shaft and connected to the output shaft by the torsion spring, and having a first coupling for producing and cancelling a rotationally fixed, planar, force-fitting first coupling between the drive shaft and the coupling gear. The transmission comprises a supporting device which is rotatable having a fixed transmission ratio of 1:X relative to the output shaft, where X can be any real number between approximately −10 and 1, and a second coupling for producing and cancelling a rotationally fixed, force-fitting second coupling between the supporting device and the coupling gear.

The invention provides a hydraulic type variable outer diameter cutting bed removing tool. The hydraulic type variable outer diameter cutting bed removing tool comprise a tube body, an upper spring, a scraper, a connecting rod, a cutter seat, a lower spring, a piston tube, a center pipe, a sliding pin, a cross rod, a side flow channel, a sliding sleeve, a shell, a planetary gear, a drive gear, a screw rod, a universal shaft and a center shaft, the sliding sleeve and the tube body are machined on the shell, the sliding sleeve and the tube body are welded through the cross rod, one end of the connecting rod is hinged to the lower end of the scraper, and the other end of the connecting rod is hinged to hinging support seats outside the cutting seat; the three hinging support seats outside the cutter seat are correspondingly mounted in three grooves in the middle of the tube body, the scraper is mounted on the slope of the groove in the middle of the tube body, the piston tube is mounted on the inner cavity on the lower part of the tube body, the screw rod, the universal shaft and the center shaft are mounted in the shell after being sequentially connected, the drive gear is mounted on the center shaft, and the drive gear, the planetary gear and a gear ring protruded on the inner wall of the sliding sleeve are sequentially engaged. According to the hydraulic type variable outer diameter cutting bed removing tool, the structure is simple, and rock removing can be effectively conducted under the work condition of rotary drilling-in or sliding drilling-in.

The invention discloses a high-temperature furnace sealing structure which comprises a supporting face. The supporting face is provided with graphite packing. A supporting flange is attached to the outer end face of the graphite packing. A supporting plate is fixedly installed on the supporting flange and is in sliding fit with an upper guide rod. A pressing ring is arranged on the graphite packing. A lower guide rod is fixedly arranged on the pressing ring. The upper guide rod is provided with a guide hole matched with the lower guide rod. The outer side of the upper guide rod is provided with a step. A spring is arranged between the lower end of the step and the pressing ring. By the adoption of the flexible sealing structure, the pressing ring bears the vertical and transverse pressure, the sealing property can be adjusted, the structural design is simple and reliable, and the use performance of equipment is greatly improved.

The invention discloses an axial-flux motor core device with a water cooling structure. The device comprises a stator core machined in a segmental manner, a core fixing block, an S-shaped spring, a cooling water pipe pressing plate, and a cooling water pipe. The front end of the core is provided with a groove, and the open side of the groove is clamped to the core fixing block. The cooling water pipe passes through the groove, and closely fits the other side of the groove. One side of the cooling water pipe pressing plate closely fits the outer wall of the cooling water pipe, and the other side is a plane and contacts the S-shaped spring. The S-shaped spring is fixed between the cooling water pipe pressing plate and the core fixing block, and is always in a compressed state. The spring presses the cooling water pipe pressing plate. According to the invention, the problems in the existing axial-flux motor stator core such as high cooling difficulty, complex structure, high processing difficulty and high cost are solved, and the structure has very good installation extension performance and can satisfy the requirements of high-power axial-flux motor installing and cooling.

The invention relates to a lifting and swiveling structure, which comprises a pulling part (6), steel balls (7), a steel ball-locking disc (8), a pedestal sleeve (9) and a steel ball-locking sleeve (10); the pulling part (6) is connected with the steel ball-locking disc (8), and the pedestal sleeve (9) is sleeved on the steel ball-locking sleeve (10); holes (91) matched with the steel balls (7) are arranged on a plurality of levels of the pedestal sleeve (9); the steel ball-locking disc (8) is arranged in the steel ball-locking sleeve (10), the steel balls (7) are arranged on a slope (81) of the steel ball-locking disc (8), the lower part of the steel ball-locking sleeve (10) is provided with holes (101) matched with the steel balls (7), the holes (101) are positioned on the same level, and the upper part of the steel ball-locking disc (8) is provided with a groove (82).

The invention provides a convenient-mounting-and-adjustment music drum. The convenient-mounting-and-adjustment music drum comprises a drum body, a drum leather arranged at two sides of the drum body, and a drum ring which is sleeved on the drum body and is used for compacting the drum leather, wherein the extension of the drum ring is provided with multiple connection lugs, a drum ring connection rod in matching with the connection lugs of the drum ring is further comprised, the connection lugs are arc-shaped projection ribs, top ends of the arc-shaped projection ribs are provided with a cucurbit-shaped connection hole respectively, the drum ring connection rod is formed by a cylindrical stainless steel pipe and two flexible supporting rods penetrating through the stainless steel pipe, one end of the drum ring connection rod is open, the other end of the drum ring connection rod is welded with a connection buckle, and the drum ring is fixedly connected with the drum body through connecting the drum ring connection rod with the drum ring connection lugs. Compared with the prior art, the music drum is advantaged in that convenient mounting and reliable connection are realized, the structure is simple and reasonable, strong practicality, convenient adjustment and convenient dismounting are realized, and a problem of fixing inconvenience existing in a drum ring in the prior art is effectively saved.

The invention discloses an intelligent integrated self-floating acoustic release mechanism. The mechanism comprises a floating body, a rope bin and an acoustic releaser, the floating body is located above the rope bin, and the acoustic releaser penetrates through the floating body and the rope bin and is fixed to the floating body; the bottom of the rope bin is fixed to underwater equipment, a rope is placed in the rope bin, one end of the rope is fixed to the bottom of the floating body, and the other end penetrates through a through hole in the bottom of the rope bin and is fixedly connected with the underwater equipment; and the acoustic releaser comprises an acoustic transducer, a control circuit and a releasing module, the acoustic transducer is located at the top of the floating body, and the releasing module is located at the bottom of the rope bin and connected with underwater equipment. According to the acoustic release mechanism disclosed by the invention, the safety and reliability of release can be improved, smooth recovery of the underwater equipment is ensured, and the influence of vibration caused by water flow impact on acoustic equipment is reduced.

A spiral extrusion device mainly comprises a motor, a reduction box, a machine frame body, an extrusion threaded rod and an extrusion cavity with a plurality of extrusion grooves, wherein the outer circumferential surface of each spiral strip of the extrusion threaded rod is processed into a polygonal structure; and the inner circumferential surface of each extrusion cavity is processed into a circumferential surface structure matched with the extrusion threaded rod. The spiral extrusion device cleverly adopts a structure of combining the extrusion threaded rod with the polygonal structure and the extrusion cavity with the cylindrical structure, the extrusion function of the extrusion threaded rod and the extrusion cavity is realized through the coordination of the polygonal extrusion threaded rod and the cylindrical cavity, and the pressure of the extrusion cavity is alternately changed according to certain proportion to generate periodical impact force when the extrusion threaded rod rotates in the cavity at constant speed, so that a better extrusion and propulsion effect is achieved. Particularly, a polygonal structure does not need to be processed in the extrusion cavity, so the spiral extrusion device is simple in structural design and convenient to process, reduces the cost, obviously improves the production efficiency and the mounting efficiency and fulfills the aims of the invention.

The invention relates to a wall-adhered jet seal pressure stabilizing device in a galvanized strip steel alloying process and an application method thereof. The device mainly consists of an air box, anozzle, a movable side plate, a flow stop plate, a support column, an upper slide way and a lower slide way; when the movable side plate is located in a closed state, the support column fixedly connected to the movable side plate horizontally supports the flow stop plate; at this time, the distance W from the end part of the flow stop plate to galvanized strip steel is 30-60 mm, so that the winding and sucking effect on the lower side of free jet is reduced; when the movable side plate is opened by moving to two ends of the upper slide way and the lower slide way, the flow stop plate is rolled over under the effect of gravity to locate in a vertical state; and at this time, the distance from the plane of the flow stop plate to the galvanized strip steel is equal to the distance from the nozzle to the galvanized strip steel. The device can effectively stop hot air currents of an insulation section of the galvanized strip steel from upwards ascending, and meets the insulation requirements of the insulation section of the galvanized strip steel on the basis of not influencing the surface quality of hot galvanized strip steel.

The invention provides a space long-service-life single-channel optical fiber rotary connector. The problems that an existing optical fiber rotary connector is large in loss, low in coupling efficiency and complex in structure are solved. In the space long-service-life single-channel optical fiber rotary connector, a shell is of a sleeve structure, and a rotor ceramic sleeve is arranged on the left side of the interior of a through hole of the shell through a bearing assembly; a first optical collimation device is installed in the rotor ceramic sleeve, and a rotor optical fiber is arranged onthe left side of the first optical collimation device and coaxially connected with the first optical collimation device. The stator ceramic sleeve is arranged on the right side of the interior of thethrough hole of the shell, and the radial position is adjusted through a fine adjustment assembly arranged on the shell; a second optical collimation device is installed in the stator ceramic sleeve,and the optical axis of the second optical collimation device is coaxial with the optical axis of the first optical collimation device. And the stator optical fiber is arranged on the right side of the second optical collimation device and is coaxially connected with the second optical collimation device.

The invention discloses a draining vehicle for transferring a water meter workpiece. The draining vehicle comprises a vehicle body frame, a transmission mechanism, a power system, a battery module, a hand wheel, workpiece placing frames and a control system. The workpiece placing frames are fixedly connected with workpiece frame fixing shafts firstly, every two workpiece placing frames are stacked on one workpiece frame fixing shaft to be placed, then the workpiece frame fixing shafts are connected with a rotary conveying mechanism and a gear mechanism through outwards-extending chain pieces, the gear mechanism is connected with the power system, and the power system is connected with the control system. The control system enables the power system to move through a control signal to drive the gear mechanism to operate, so that the rotary conveying mechanism starts to drive the workpiece placing frames to operate. Overturning of the workpiece placing frames mainly has an automatic implementation mode and a manual implementation mode, the functional requirements of an existing draining vehicle can be met, and the workpiece placing frames can adapt to automatic transferring in the automatic assembling process of water meters and automatic clamping and containing of workpieces.

The invention discloses a multi-rotor unmanned aerial vehicle which comprises a vehicle body, a plurality of lifting rotors and a forward rotor, and the lifting rotors are configured to generate a lifting driving force for overcoming gravity in a lifting or level flight process of the multi-rotor unmanned aerial vehicle; the forward rotor is configured to generate a horizontal driving force for pushing or pulling the multi-rotor unmanned aerial vehicle to advance; the plurality of lifting rotors are respectively connected with the vehicle body and are distributed on the peripheral side of thevehicle body; the forward rotor is connected with the vehicle body and arranged at the head part or the tail part of the vehicle body; the multi-rotor unmanned aerial vehicle is provided with flappingconnecting mechanisms used for enabling each lifting rotor to be connected with the vehicle body in a flapping mode. The multi-rotor unmanned aerial vehicle can fly under the condition that the rotating plane / propeller disc plane of the lifting rotor is a negative rake angle by means of cooperation of the lifting rotors, the forward rotor and the flapping connecting mechanisms; power consumptionis reduced, and meanwhile, the maximum forward flight speed of the multi-rotor unmanned aerial vehicle is increased.

The invention relates to a fabricated wallboard. The fabricated wallboard comprises a framework system, wherein the framework system comprises a first keel, a second keel and a third keel which are perpendicularly connected with one another, the first keel and the third keel are linearly arranged in the horizontal direction parallel to the ground, the second keel is linearly arranged in the direction perpendicular to the ground, the first keel and the second keel form single frame structures, the third keel is arranged between the two single frame structures formed by the first keel and the second keel, and the framework system of a double frame is formed. The first keel, the second keel and the third keel are of a square tube structure. According to the fabricated wallboard, three main structural members of the framework system, a pipeline system and a decorating plate are arranged, a specifically-made first connecting piece, a second connecting piece and a third connecting piece areused for perfectly combining the framework system, the pipeline system and the decorating plate, a complete wallboard structure can be rapidly fabricated, workpieces are completely made in a factory,the quality of products is improved through an industrialized method, and the quality and performance of the wallboard are comprehensively ensured.

The invention provides a wind tunnel test stand with a unilateral aerodynamic force. A handle is rocked to provide power; the handle is rocked, a middle gear drives a left gear and the right identical gear to rotate in the same direction, and rotation of the left gear and the right gear drives a first screw rod and a second screw rod to move forwardly; a rear flow guide clamping plate moves along a linear guide rail under pulling force effects of the first screw rod and the second screw rod; drawing of a thin plate is driven through the pulling force of the first screw rod and the second screw rod and the traction force of the linear guide rail; the rotation angles of the first screw rod and the second screw rod can be measured by a rotation disc; and the drawing distance of the thin plate can be obtained according to pitches of the first screw rod and the second screw rod. The wind tunnel test stand with the unilateral aerodynamic force has the advantages that reverse engagement of the gears controls movement of the first screw rod and the second screw rod to achieve high precision and high reliability, movement of the first screw rod and the second screw rod can be controlled only by rotating the handle, the operation is extremely simple, the overall structure is simple, the weight is light and the like.