366 results about "Four-bar linkage" patented technology

The invention provides an agricultural seeding machine, and relates to the technical field of seeding equipment, the agricultural seeding machine comprises a profiling frame installed on a rack, a furrow opener and a press wheel, the furrow opener and the press wheel are connected to the profiling frame, the profiling frame is a four-bar mechanism and is provided with a lower connecting rod and a first side connecting rod, and the furrow opener is rotatably connected to the first side connecting rod; a pressing wheel frame is hinged to the first side connecting rod, the pressing wheel is rotationally connected to the pressing wheel frame, and a pressing wheel spring is connected between the pressing wheel frame and the first side connecting rod; a locking rod is hinged to the first side connecting rod, a locking rod spring is connected between the locking rod and the first side connecting rod, a first locking tooth is arranged on the upper portion of the locking rod, a second locking tooth meshed with the first locking tooth is arranged at the end of the lower connecting rod, and a material stirring baffle is connected to the end of the locking rod. The material stirring baffle can rotate when stirring soil, so that the profiling frame is locked, the furrow opener cannot float upwards, the press wheel can roll and cross soil blocks, and the influence of vertical floating of the furrow opener in a short time on the furrowing depth can be reduced.

Foldable sleeping basket, characterized in that it comprises: Support rod receptacles (1), wherein two groups of support rod receptacles (1) are provided and arranged at intervals, wherein a plurality of transverse support rods (2) are fixedly connected between the two groups of support rod receptacles (1), and a curved bottom rod (3) is hingedly connected to each of the two end sides of the two groups of support rod receptacles (1); inclined support rods (4), wherein the inclined support rods (4) are arranged in groups of two and are articulated symmetrically to the support rod holder (1), a connecting rod between the inclined support rods (4) and the base rod (3) is articulated on the same end side of the support rod holder (1), and the support rod holder (1) and the inclined support rod (4) on the same end side, the connecting rod and the base rod (3) form a first four-bar linkage; Enclosing rods (5), wherein two groups of enclosing rods (5) are provided and both are bent rods, the two groups of enclosing rods (5) are arranged one-to-one and above the two groups of floor rods (3), the ends of the two groups of enclosing rods (5) are hingedly connected, the upper ends of the inclined support rods (4) are hingedly connected to the enclosing rods (5) on the corresponding side, the two groups of inclined support rods (4) on the same support rod holder (1) and the enclosing rods (5) form a second four-bar linkage, wherein the second four-bar linkage is a control end and is hinged to change the deformation state of the first four-bar linkage; and a handle (6), wherein the handle (6) is hinged to a node point of two groups of the enclosing rods (5).

A closure mechanism for an opening defined by a center and an outer edge, includes multiple segments which can all together close the opening. Each segment has a first pivot lever and a second pivot lever and is controlled by the pivoting movements thereof. The segment along with its pivot levers forms a four-bar linkage. All first pivot levers are attached to a first base and all second pivot levers are attached to a second base. The relative movement between the first base and the second base leads to a drive movement for the pivot levers, wherein the second pivot lever is mechanically coupled to the first base via a cam gearing mechanism.

A surgical tool is provided that includes a hollow shaft and a cable extending within the shaft such that the cable is isolated from external forces imparted to the shaft; the shaft and a carriage are included as links of a 4-bar linkage that also includes first and second side links that are rotatably mounted to the carriage at respective first and second distal pivot axes and that are rotatably mounted to the shaft at respective first and second proximal pivot axes; the segment of the cable extends between a distal pulley rotatably at the carriage and a proximal pulley rotatably mounted at the shaft and a segment of the cable extends within the shaft; a distance between the first distal and first proximal pivot axes matches a distance between an axis of the distal pulley axis and an axis of the proximal pulley such that a rocking motion of the 4-bar linkage due to external force upon the shaft exerts no force upon the cable.

The invention discloses a wheel leg type suspension device for a vehicle, and belongs to the technical field of vehicle chassis suspension. The upper end of a vertical swing arm is hinged to a bogie, the lower end of the vertical swing arm is hinged to one end of a longitudinal swing arm, and the other end of the longitudinal swing arm is hinged to a connecting seat; the vertical swing arm can swing back and forth, and the longitudinal swing arm can swing up and down; the two ends of the connecting rod are hinged to the vertical swing arm and the connecting base respectively, so that the vertical swing arm, the connecting rod, the longitudinal swing arm and the connecting base jointly form a four-connecting-rod mechanism, and up-down movement and front-back movement of the wheels are decoupled. The two ends of the hydro-pneumatic spring are hinged to the bogie and the longitudinal swing arm correspondingly and used for driving the wheels to move up and down and reducing vibration. The two ends of the driving cylinder are hinged to the bogie and the vertical swing arm correspondingly and used for driving the wheels to move front and back. The requirements of high-speed running and high trafficability of vehicles can be met, the basic requirements of the vehicles on the suspension device are met, and the suspension device can be applied to suspension of steering axles and non-steering axles.

The invention discloses a foldable wing with separated wing ribs, and belongs to the technical field of foldable wings, the foldable wing comprises racks, wing spars and the wing ribs, the racks and the wing spars are arranged in pairs, and the wing ribs connect the paired wing spars into a whole; the wing spar comprises a driving wing spar, a main wing spar and an extended wing spar; a folding and unfolding driving device is arranged in the rack, one end of the rack is directly connected with the fuselage, the other end of the rack is connected with a driving wing spar, the driving wing spar is connected with a main wing spar, and the main wing spar is connected with an extended wing spar; a fixed wing spar is arranged on the outer side of the driving wing spar, and the rack, the driving wing spar, the main wing spar and the fixed wing spar form a first four-bar mechanism; connecting spars are arranged on the inner sides of the main spars, and the driving spars, the main spars, the connecting spars and the extended spars form a second four-bar mechanism. The folding and unfolding driving device is matched with the four-connecting-rod mechanism and the separation wing ribs to drive the wings to be folded and unfolded, the weight of the folding and unfolding driving device is reduced, three-section folding of the wings is achieved, and the space cost of an aircraft is reduced.

The invention belongs to the technical field of aircraft structure design, and particularly relates to an aircraft arbitrary space four-bar mechanism parameter optimization method, which comprises the following steps: firstly, determining input conditions or preposed requirements of a four-bar mechanism, secondly, establishing a mathematical model of a four-bar mechanism optimization problem, and then, carrying out derivation and analysis to obtain a four-bar mechanism parameter optimization result. The method comprises the following steps: establishing an analytic expression of parameter variables of the four-bar mechanism and compiling a corresponding calculation program, then carrying out iterative optimization on the parameters of the four-bar mechanism by utilizing an optimization algorithm, and finally outputting an optimization result to obtain an optimal design parameter.

The invention provides a design method of a two-wheeled wheel-legged robot, which relates to the field of wheeled robots, and comprises the following steps: determining a machine body of the two-wheeled wheel-legged robot, adopting a leg four-bar mechanism as a leg configuration, and taking the leg four-bar mechanism and the machine body as a five-bar mechanism together, a universal leg rod length parameter calculation method is deduced based on a planar five-connecting-rod model, key geometric parameters are determined, and robot structure design is completed; establishing a wheel type motion dynamical model and a leg type jump phase motion dynamical model, deducing a universal motor model selection method, calculating driving wheel and joint motor parameters, and completing wheel train design and whole machine motion simulation; carrying out finite element analysis and lightweight design on the key parts; and finally, an LQR control strategy is adopted, and cooperative control verification is completed through analysis and simulation software. Wheeled efficient movement and leg type terrain adaptive capacity are fused, limitation of a single movement mode is broken through, and the environment adaptive boundary of the robot is expanded.

A telescopic joint suitable for a novel magnetic levitation track comprises main crown rails, auxiliary crown rails and an equipartition connecting rod mechanism, the main crown rails are fixed below flange plates on the two sides of a T-shaped track beam joint, and the auxiliary crown rails are arranged between the main crown rails; a transverse slide way and two longitudinal slide ways are arranged in the middle of the top face of the auxiliary crown rail, and the two longitudinal slide ways are symmetrically distributed on the two sides of the transverse slide way. The equally-divided connecting rod mechanism is a four-connecting-rod mechanism and is arranged on the top of the auxiliary crown rail, hinge points of the four-connecting-rod mechanism are correspondingly connected with the sliding ways in a sliding mode, and the two ends of the four-connecting-rod mechanism are hinged to the top of the front main crown rail and the top of the rear main crown rail respectively. When the main crown rail stretches and retracts along with the T-shaped rail beam, the auxiliary crown rail is driven to move through the equipartition connecting rod mechanism, and gaps between the front end and the rear end of the auxiliary crown rail and the main crown rail are always kept equal. Interference with an electromagnetic module below the bogie of the maglev train can be avoided, and it can be guaranteed that front and rear telescopic gaps of the connector are equal.

A device for automatically clamping the four-corner lifting lugs of a ton bag, which comprises a blanking cylinder. An elevating frame is arranged on the outer side of the blanking cylinder. The lower ends of the four corners of the elevating frame are respectively hinged to the upper ends of a clamping lug mechanism. The upper part of the clamping lug mechanism is hinged to the cylinder rod of an external swing cylinder. The clamping lug mechanism comprises a vertically arranged large swing arm. An elevating cylinder is arranged on the upper part of the large swing arm. The cylinder rod end of the elevating cylinder is connected to a transition plate. The lower end of the transition plate is hinged to the upper end of a small swing arm. The small swing arm is a parallel four-bar linkage mechanism. A sliding connection block is arranged in the middle of the small swing arm. The sliding connection block is hinged to the cylinder rod of an internal swing cylinder. A clamping lug cylinder is arranged at the end of the cross bar of the large swing arm. The cylinder rod of the clamping lug cylinder is connected to a horizontal clamping plate. A V-shaped clamping seat is arranged in front of the horizontal clamping plate. A lifting lug collecting assembly is arranged on the lower connecting rod of the small swing arm. A lifting lug collecting cross bar is arranged at the upper end of the lifting lug collecting assembly. The invention can automatically clamp the four-corner lifting lugs of the ton bag, replacing the operation of manually hanging the four-corner lifting lugs.

The utility model belongs to ocean engineering equipment, and discloses a towed ditcher, which comprises a frame assembly, a ditcher body, a ditcher body, a ditcher body and a ditcher body, the injection cutter assembly is hinged to the tail of the frame assembly through a four-bar mechanism, and retraction, release and swing of an injection cutter are controlled through an oil cylinder; the hoisting assembly is hinged to the top of the frame assembly and has two degrees of freedom; the cable grabbing hand assembly is fixed to the front portion of the frame assembly through a four-connecting-rod lifting mechanism, and lifting and clamping jaw opening and closing are controlled through an oil cylinder; the sliding shoe assemblies are fixed to the two sides of the frame assembly; high-pressure water flow is directly conveyed to the injection cutter through the pipeline, so that the equipment can operate independently, a water source does not need to be provided by a mother ship, the requirements of marine equipment are reduced, the construction cost and the operation complexity are reduced, the width of the injection cutter can be changed by adjusting the oil cylinder, and the laying requirements of cables or pipelines with different diameters are met; and the universality and the flexibility of the equipment are enhanced.

A folding marine cleat can include a base and a cleat head having a detent spring member. The cleat head can be positionable with respect to the base in stowed and deployed positions by a four-bar linkage with first and second legs to transition the cleat head between deployed and stowed positions. The legs can include stowed and deployed flat portions positionable to selectively be in contact with and abutting the detent spring member to retain the cleat head in the stowed or deployed position. The base can include fastener retention slots with opposing opening surfaces and opposing retention surfaces being spaced apart at a distance to receive a square portion of a fastener therebetween to fix the fastener in axial rotation with respect to the cleat base, with the opposing opening surfaces being spaced apart at a distance narrower than a distance across the square portion of the fastener.

The invention discloses an automatic take-up tension control method of a template machine, and belongs to the technical field of textile. The invention aims to solve the problems of low tension control precision and poor adaptability caused by insufficient nonlinear interference compensation, lack of multi-working-condition collaborative analysis and high manual dependency in the prior art. According to the method, the cloth thickness is collected in real time through a thickness sensor, and a yarn consumption predicted value is output through a core model in combination with the stitch length; the AI module feeds back dynamic optimization model parameters based on the broken line record and the stitch tightness, and generates accurate line consumption; a servo motor is driven on the basis of the difference between the value and the standard quantity, and the rotation angle of the motor is converted into the angular displacement of the take-up-lever through a four-bar mechanism composed of a coupler, an eccentric shaft and the take-up-lever. By combining closed-loop feedback of a displacement sensor and spindle phase collaboration and integrating AI anomaly diagnosis, a self-optimization system driven by historical data is constructed, and tension stability and stitch quality under complex working conditions are continuously improved.

A foldable photovoltaic panel module disclosed by the present invention comprises a photovoltaic support, photovoltaic assemblies are hinged to two sides of the bottom of the photovoltaic support, each photovoltaic assembly comprises a plurality of photovoltaic mounting racks, and the plurality of photovoltaic mounting racks are sequentially connected end to end through hinge mechanisms to form a foldable flat plate structure. The photovoltaic mounting frame close to the photovoltaic support is hinged to the bottom of the photovoltaic support and provided with a torsion gear, photovoltaic panels are mounted on the photovoltaic mounting frame, a stepping motor is arranged at the bottom of the photovoltaic support, the output end of the stepping motor is connected with a driving gear, and the driving gear is meshed with the torsion gear. A four-bar mechanism is adopted to achieve unfolding and folding of the photovoltaic panel, a folding mechanism is simple and effective, meanwhile, stepping motor driving and a steel cable winch driving mechanism are jointly used, the torque requirement for the stepping motor is lowered, the overall reliability of the device is improved, and the device is suitable for popularization and application. And the equipment is not easy to damage, long in service life, low in operation and maintenance cost and high in expansibility.

A surgical tool includes a shaft and a cable within the shaft, the cable being isolated from external forces imparted to the shaft; the shaft and a carriage are links of a 4-bar linkage that also includes first and second side links rotatably mounted to the carriage at respective first and second distal pivot axes and that are rotatably mounted to the shaft at respective first and second proximal pivot axes; the cable segment extends between a distal pulley rotatably at the carriage and a proximal pulley rotatably mounted at the shaft, a cable segment extends within the shaft; a distance between the first distal and first proximal pivot axes matches a distance between a distal pulley axis and an axis of the proximal pulley such that a rocking motion of the 4-bar linkage due to external force upon the shaft exerts no force upon the cable.

The utility model relates to the technical field of electronic equipment processing, in particular to a printed circuit board clamp which comprises a base, a plurality of fixing units are arranged on the base in a sliding mode, a platform for containing a circuit board is arranged on the fixing units, a clamping unit is further arranged on the base, and the clamping unit comprises a clamping nozzle. The clamping nozzle is used for clamping or supporting a circuit board; the elastic piece and the clamping plate are fixed, and when the clamping mouth is in contact with the circuit board, the deformation of the elastic piece disperses the clamping pressure in a self-adaptive manner, so that local overload is avoided; the clamping unit is linked with a clamping plate through hinge rods at two ends of an adaptive rod to form a four-connecting-rod mechanism, displacement caused by vibration or thermal expansion is counteracted in real time, meanwhile, a lead screw abuts against the lower end face of the circuit board, the supporting height is finely adjusted, bending deformation is corrected, and dual protection of elastic clamping and rigid supporting is formed; the problem of circuit board deformation caused by rigid clamping in the prior art is solved.

The utility model discloses an anti-damage clamp for grinding a thin-wall bearing ring, and relates to the technical field of bearing machining. The bearing clamping device comprises a mounting plate, the mounting plate is mounted on external mobile equipment, two clamping plates are slidably arranged on the inner side of the mounting plate, anti-skid rubber pads are mounted on the inner sides of the clamping plates, the inner sides of the clamping plates are concave, the two clamping plates move in the direction close to each other to clamp a bearing, and a linkage set is mounted on the inner side of the mounting plate. According to the clamping device, the air cylinder drives the rack to linearly advance and synchronously mesh with the missing gears on the two sides to achieve rotary transmission, the first telescopic rod pushes the clamping plates to move oppositely, the anti-skid rubber pads on the inner sides of the concave clamping plates elastically deform when making contact with the thin-wall bearing ring, and concentrated clamping force is evenly dispersed to the contact face of the outer wall of the ring; the four-bar mechanism of the double clamping plates and the second telescopic rod form a redundant stable system, the clamping posture is still kept stable under grinding high-frequency vibration, and it is guaranteed that the ferrule is free of plastic deformation in the whole machining process.

The invention discloses an electric control lifting mechanism of a model pantograph, and effectively solves the problem that an electric control lifting pantograph device of an existing electric locomotive model is poor in appearance simulation degree. Comprising a model pantograph module and an electric control driving module. The model pantograph module comprises a sliding plate model and two four-bar mechanisms which are connected in series, and the sliding plate model can ascend or descend under the control of the electric control driving module; the electric control driving module is arranged at the lower part of the model pantograph module; the electric control driving module drives the sliding plate model to lift by stretching and releasing a rope penetrating through a central hole of a circuit breaker insulator mimic pull rope sleeve; the device is simple in structure, novel in conception, convenient to use and high in practicability.

This invention provides a hood hinge structure and a vehicle. The hood hinge structure includes a connecting seat for connecting to the hood, a fixing seat for mounting on the vehicle body, and a first link and a second link. Both the first link and the second link are hinged between the connecting seat and the fixing seat, forming a four-bar linkage with the connecting seat and the fixing seat. When the hood is closed, viewed from the left-right direction of the vehicle, there is a preset distance, no greater than 10mm, between the intersection point K of the extension lines of the first link and the second link and the rear tip P of the hood. The hood hinge structure of this invention sets the preset distance range between the intersection point K of the extension lines of the first link and the second link and the rear tip P of the hood, ensuring that the movement trajectory of the rear tip P of the hood and the rear tip S of the lower edge of the hood tends to move away from the rear of the hood and fender seam. This prevents the rear tip S of the lower edge of the hood from rotating and overlapping with the fender, thereby helping to avoid paint peeling on the fender.

A lift arrangement (100) for loading and unloading a wheelchair into a compartment of a vehicle such as a bus, truck or train is provided. The lift arrangement comprises a bed configured to accommodate a wheelchair, and an actuating system (20) configured to set the bed (30) between a first position and a second position. The actuating system comprises a main unit (10) having a frame (11) configured to be fastened to the floor (2) or to a wall in the vehicle compartment. The actuating system further comprises a telescopic column (25) comprising a first part (21) and a second part (22) being axially slidingly connected to one another. The first part of the telescopic column is connected to the main unit via two or more link arms (23) in a four-bar linkage (24). The second part of the telescopic column is slidingly connected to the bed (30) such that the bed (30) may be slidingly displaced. The four-bar linkage and the telescopic column are connected to and configured to be actuated by at least one respective hydraulic or pneumatic actuator.

This invention relates to a biomimetic flapping-wing aircraft with variable fuselage attitude, comprising a frame, a motor fixed to the frame, and wings symmetrically arranged on the left and right sides of the frame. The wings include a crank-rocker mechanism hinged to the frame, a four-bar linkage movably passing through the frame, and a flapping rod. The motor drives the crank-rocker mechanism to rotate; the crank-rocker mechanism is connected to the four-bar linkage to drive it in a reciprocating oscillating motion; the flapping rod is fixed to the outside of the four-bar linkage. The wing employs a two-segment flapping mechanism, which helps reduce drag from upward flapping while ensuring lift from downward flapping, improving the overall energy utilization rate. The biomimetic flapping-wing aircraft uses a segmented structure with variable fuselage attitude, making it more agile and biomimetic. It can mimic various basic bird movements, enabling flapping flight, high-altitude emergency stops, and turning maneuvers.

Such a fuel filler flap system with a vehicle-mounted base in its ready-to-use state, and with a fuel filler flap that is movably mounted on the base by means of a four-bar linkage mechanism between a closed position closing a tank recess and an open position releasing the tank recess, and with a drive motor that is coupled to the four-bar linkage mechanism to move the fuel filler flap between the closed position and the open position, is known. According to the invention, a coupling lever is provided which connects a crank arm, which is rotationally fixed to a drive shaft of the drive motor, to the four-bar linkage in a movement-transmitting manner in order to move the four-bar linkage between the closed position and the open position of the fuel filler flap when the drive motor is activated, and the crank arm and the coupling lever can be moved into an over-center position in the closed position of the four-bar linkage, which blocks an opening movement of the four-bar linkage. Use for passenger cars

A kind of farmland soil hardness real-time detection device and detection method, it includes laser ranging sensor, inclination sensor, Beidou satellite template, baffle, four-bar linkage mechanism, soil disc assembly, beam, U type card, counterweight area and beam frame, soil disc assembly is connected with counterweight area, soil disc assembly top is equipped with baffle, soil disc assembly is connected with beam frame by four-bar linkage structure, beam frame one side installs beam, beam is equipped with U type card, beam frame top is equipped with laser ranging sensor, inclination sensor and Beidou satellite template.This farmland soil hardness real-time detection device and detection method combines agricultural machinery ridging, sowing, fertilizing, cultivation and other operations, utilizes the data received by vehicle-mounted computer software system to measure, so that sensor accurately measures the depth of cutting soil disc pressed into soil, to achieve the purpose of detecting soil hardness, reflects the related information such as farmland soil plough layer thickness, soil fertility, improves the detection efficiency of soil hardness.

The utility model belongs to but is not limited to the agricultural machinery technical field, especially relates to a kind of liftable device for flue-cured tobacco dry-wet alternate seedling, mainly by seedling facility unit module, lifting device module and track network system constitute.The seedling facility unit module adopts aluminium alloy perforated backing plate with quick detachable locking mechanism and integrated tooth group locking and double "X" type support of chrome plated light axle direction, and synchronous lifting (precision ±0.5mm) is realized by Φ40mm rigid synchronous shaft linkage.The lifting device module is driven worm wheel elevator by servo motor, and power is transmitted through cross torque distributor and four-bar linkage mechanism.The track network system integrates hydraulic support leg (synchronous precision ±0.2mm) and interference fit track, supports AGV automatic movement operation.The device monitors substrate water and fertilizer state by EC sensor, automatically controls seedling tray and nutrient solution contact-disengagement cycle, realizes accurate dry-wet alternate seedling, effectively improves seedling efficiency and automation level.

The invention provides a vehicle roof handle and a vehicle, and belongs to the technical field of vehicle parts. At least one end of the handle body is connected with the base through a telescopic device, and the end of the handle body can be close to or away from the base through the telescopic device; the telescopic device comprises a first rocker arm, a second rocker arm and a connecting rod arm, one end of the first rocker arm is hinged to the base, the other end of the first rocker arm is hinged to the connecting rod arm, one end of the second rocker arm is hinged to the base, and the other end of the second rocker arm is hinged to the connecting rod arm. The first rocker arm, the second rocker arm, the connecting rod arm and the base form a four-rod mechanism. The automobile handle has the beneficial effects that extension and retraction between the handle body and the base are allowed through the four-connecting-rod mechanism, so that the handle body can be in a retraction state of being tightly attached to the base when not in use and can be stretched and pulled out when in use, and the space in an automobile is saved.

The utility model relates to the technical field of rehabilitation, and discloses a driving structure using four connecting rods to provide double power, which comprises a fixed support frame, the fixed support frame is composed of two side plates, a plurality of connecting plates and a limit shaft, the top of each side plate is provided with the plurality of connecting plates, and the limit shaft is provided with the plurality of connecting plates. The two side plates are fixedly connected through a plurality of connecting plates, a servo motor is fixedly installed at the left end of the side plate on the rear side, a first transmission assembly is arranged at the left end of the bottom of the fixed supporting frame, and the first transmission assembly is connected with the output end of the servo motor. The output end of the first transmission assembly is connected with the input end of the second transmission assembly, and the output end of the second transmission assembly is connected with the input end of the third transmission assembly. A plurality of groups of four-connecting-rod mechanisms are adopted, power distribution is achieved through combination of a fixed supporting frame and a transmission assembly, and two power systems can be synchronously driven by a single power source through cooperative work of the three four-connecting-rod mechanisms.

The application provides a deformable wing using a telescopic connecting rod mechanism, comprising: a plurality of frames; a plurality of connecting rod mechanisms, each of which is arranged on a frame, each of which comprises a telescopic first connecting rod, a non-telescopic second connecting rod and a connecting rod for connecting the first connecting rod and the second connecting rod; and a plurality of driving devices, each of which has a frame on the upper side and the lower side respectively, and each of which is connected with the first connecting rod in the two corresponding connecting rod mechanisms, so as to control the two first connecting rods to synchronously stretch and retract. The application can realize the length adjustment of the aircraft wing in the wing profile section direction, so as to change the wing profile area and the angle of attack, thereby enabling the aircraft to adjust the lift-drag ratio by controlling the movement of the four connecting rod mechanisms to adjust the wing area and the angle of attack when the lift needs to be adjusted. The application has the advantages of simple structure, stable control, high safety factor and the like.

A combined power intake duct with a translational linkage flow regulation geometry device and its operating method are disclosed. This invention features a wide-range intake flow regulation range. Based on the principles of changing the capture flow and increasing the throat flow capacity for stable intake operation, this invention proposes a linkage flow regulation geometry device involving the translational lip and throat. The geometry device consists of a translational lip, a translational throat, and a four-bar linkage. It can achieve multi-dimensional optimization of intake performance by coordinating and controlling the actual capture flow and throat compression through single-degree-of-freedom adjustment. The geometry device operates in two states during movement: 1) When the four-bar linkage moves backward, the actual capture flow decreases, the ram throat height increases, and the turbine throat height decreases; 2) When the four-bar linkage reaches a certain position and continues to move backward, the actual capture flow decreases, the ram throat height decreases, and the turbine throat height increases.