48results about How to "Large output thrust" patented technology

A manually and / or fluid-pressure operated rotary actuator is coupled with a power screw in a compact assembly to produce large linear thrust. The actuator is operated in both directions by fluid pressure or in one direction by fluid pressure and in the other by spring energy, or by fluid pressure alone or in combination with manually applied force. The actuator has a cylindrical housing, a cylindrical reaction member inside of the housing, a cylindrical piston partially covering the reaction member, a cylindrical rotor partially covering the piston, a device forcing rotation of the piston when moving axially with respect to the reaction member and / or rotor, a plunger engaged with the rotor and restrained from turning with respect to the housing, a base through which the plunger extends, a spring connected to the rotor and housing, a two port assembly, and a handle affixed to the reaction member for manual operation.

The invention relates to a permanent magnet vernier linear motor for urban rail transits, which comprises a motor primary (1), and a motor secondary (2) separated from the motor primary (1) through an air gap; the motor primary (1) comprises a flat primary iron core (3), an armature winding (5), flux modulation poles (6), wherein primary teeth (4) protruding out of the periphery of the primary iron core are arranged on the primary iron core (3), the armature winding (5) is wound on the primary teeth (4), and protruding small tooth portions on the primary teeth (4)are flux modulation poles (6), the motor primary (1) is mounted on a train; the motor secondary (2) comprises permanent magnets (7) and a secondary iron core (8), wherein permanent magnets (7) are embedded in the secondary iron core (8) along a horizontal direction in gaps with a same distance, and the motor secondary (2) is arranged on the train rail. The motor can improve the stability of the linear motor for urban rail transits during low velocity operation, the motor efficiency is improved, and high theoretical and practical values are provided.

The invention relates to a magnetic suspension planar motor with a superconductor excitation structure, belongs to the technical field of motors and solves the problems of complicated structure, large planer movement scope, low winding utilization efficiency, small reasoning density and low system efficiency existing in the existing permanent magnet synchronous planar motor. In the magnetic suspension planar motor, a primary substrate is flat plate-shaped; an armature winding is fixedly arranged at the air gap side of the primary substrate; a secondary substrate is uniformly divided into 2h*2h magnet cells; 2h<2> superconducting magnets are respectively and fixedly arranged in the superconducting magnet cells adjacent at opposite angles on the secondary substrate and are not adjacent parallelly and vertically; the superconducting magnets are magnetized in parallel, the magnetizing directions of the superconducting magnets are vertical to a surface at the air gap side of the secondary substrate; the magnetizing directions of the superconducting magnets positioned on the same line or row are identical; the magnetizing directions of the superconducting magnets positioned on adjacent lines or rows are opposite; and a cooling container is covered outside all the superconducting magnets. The magnetic suspension planar motor has the beneficial effects that the primary suspension motion is realized, the suspension height is large, the bearing capacity is strong, and the magnetic suspension planar motor can be applied to the vacuum environment.

The invention belongs to the field of hydraulic techniques, and particularly discloses an automatic locking cylinder which comprises a cylinder body, a locking device, a driving device and a positioning sleeve, wherein multiple stages of cylinders are arranged inside the cylinder body; the positioning sleeve is fixed at the top end of the cylinder body; the locking device is assembled on the output shaft of the cylinder body and is used for locking and unlocking the output shaft; the locking device is positioned above the positioning sleeve; the locking device is adhered to the top end of the positioning sleeve when the cylinder is locked; the locking device moves far away from the top end of the positioning sleeve when the cylinder is unlocked; the driving device is fixed on the positioning sleeve through a connection flange and is used for driving the locking device to perform locking or unlocking operation. The cylinder can be locked after a target stroke is achieved and is kept in a stoke state for a long time. The automatic locking cylinder is simple in structure, few in components, low in cost, low in fault rate and convenient in remote control, and in addition, the thrust force output from the cylinder is large due to the design of multiple stages of cylinders.

The invention relates to an orthographic double-driving-type precise piezoelectric stick-slip linear motor and a driving method thereof. The technical problems are solved that since single-stator driving is adopted for an existing piezoelectric stick-slip linear motor, the output thrust is small, the stroke is short, and the precision is low. The motor comprises an inclined trapezoidal orthographic driving assembly, a rotor assembly, a base, a displacement adjuster, a dovetail platform and dovetail platform limit strips. The inclined trapezoidal orthographic driving assembly generates lateraldisplacement, the contact positive pressure between the inclined trapezoidal orthographic driving assembly and the rotor assembly is adjusted, and comprehensive regulation and control for the frictionforce are achieved; meanwhile, the inclined trapezoidal orthographic driving assembly is driven through different combinations of asymmetric electric signals, and multiple kinds of driving modes suchas output reinforcement type and motion emergent-stopping type can be achieved. The orthographic double-driving-type precise piezoelectric stick-slip linear motor has the advantages of large output thrust, high precision, long stroke and the like and has great application prospects in micro-nano precise driving and poisoning fields such as processing of optical precise instruments and semiconductors.

The invention discloses a parallel drive piezoelectric stick-slip linear motor and a drive method therefor to solve the technical problems of small output thrust, small stroke and low precision due tothe fact that single stator drive is adopted by an existing piezoelectric stick-slip linear motor. The parallel drive piezoelectric stick-slip linear motor comprises oblique trapezoid drive assemblies, locking screws, a base, a dovetail platform displacement adjuster, a dovetail platform, dovetail platform limiting strips and a sliding assembly. The oblique trapezoid drive assemblies adjust the positive contact pressure between the oblique trapezoid drive assemblies and the sliding assembly through generating lateral displacement to achieve comprehensive adjustment and control on the frictional force; and meanwhile, the oblique trapezoid drive assemblies are excited through different asymmetric electrical signal combinations, so that multiple drive modes, such as an output enhancement drive mode and a moving crashstop drive mode can be achieved. The parallel drive piezoelectric stick-slip linear motor has the characteristics of large output thrust, high precision and large stroke, andhas a good application prospect in the field of micro-nano precision driving and positioning, such as optical precision instrument and semiconductor processing.

The invention relates to a cylindrical linear motor with ring gears of different widths for axial feed. A motor primary part comprises a primary iron core gear groove structure of the spaced unequal-width ring gears, which is formed by sequentially placing large ring gears, washers and small ring gears in the axial direction in a combined way at the inner side of a primary yoke part sleeve, wherein phase winding coils are placed at the two sides of the large ring gears at intervals and are connected axially in series. A motor secondary part comprises a secondary core and secondary magnetic steel, which are alternatively placed at outer circle of a spindle in the axial direction. Electromagnetic thrust generated between the motor primary part and the motor secondary part drives the spindle to implement axial feed. The motor is simple in structure, convenient to machine, easy to connect the winding coils, large in output electromagnetic thrust and small in thrust fluctuation. Furthermore, a slide bar type micro pulse displacement sensor can accurately measure the linear location and speed of the motor, which lays a foundation for the implementation of quick response and feedback control at high precision. The cylindrical linear motor can be applied to axial feed of machining for various high-speed high-precision machine tools.

The invention discloses a linear motor with non-uniform teeth and without magnetic track, and relates to the technical field of a permanent-magnet linear motor. The linear motor comprises two parts comprising a rotor and a stator, wherein the rotor comprises a rotor yoke, rotor teeth, rotor tooth end parts, windings and permanent magnets, the stator comprises a stator yoke and stator teeth, the rotor teeth connected with the rotor yoke are arranged in a space in a non-uniform way, the permanent magnets are arranged at the rotor tooth end parts, the windings are arranged in grooves formed by the rotor teeth, and the stator teeth are connected to the stator yoke. The permanent magnets are not needed to be arranged on the stator, the linear motor is low in cost and is simple to install and transmit, and the motor is long in lifetime, small in electromagnetic interference and small in potential risk and has wide application prospect.

The invention provides a stator and a rotating linear two-degree-of-freedom permanent magnet motor with a modular structure. The rotating linear two-degree-of-freedom permanent magnet motor with the modular structure comprises a stator and a rotor, and the stator comprises a stator core, a rotating motion winding and a linear motion winding; the stator iron core is formed by a plurality of same modular iron core units in a three-phase mode on the circumference. Stator grooves are formed in the axial direction and the circumferential direction of an inner surface of the stator iron core at thesame time, so that stator teeth are distributed in an array mode and evenly distributed on all the modular iron core units. The rotating motion winding is wound on stator teeth which are axially arranged along an inner surface of the stator core along the linear motion direction to form a phase group centralized winding for driving rotary motion; and the linear motion winding is wound on the stator teeth arranged along the circumferential direction of the inner surface of the stator iron core along the circumferential direction to form a phase group centralized winding for driving linear motion. The structure is simple, the manufacturing is easy, and the material utilization rate is increased.

The invention discloses a ring winding magnetic field modulation linear motor, which belongs to the field of motors and solves the problems of material waste, complicated insulation process between windings, large motor thrust fluctuation and low frequency caused by the long end part of the traditional linear permanent magnet motor winding and the winding mode of the winding. The ring winding magnetic field modulation linear motor comprises a primary winding and a secondary winding, a gap exists between the primary winding and the secondary winding, by adopting pole-slot match between the primary winding and the secondary winding and the ring winding, non-uniform air gap permeance plays a role of pole changing, the magnetic motive force of the primary winding and the air gap permeance interact mutually, a magnetic field with the same pole number as secondary permanent magnets is generated, the two magnetic fields interact mutually to generate a constant thrust, and thus, the limitation that the pole number of the primary winding and the pole number of the secondary winding of the traditional linear permanent magnet synchronous motor need to be the same is further broken. The pole-pairs number P of the secondary permanent magnets, the slot number Q per side of the primary winding and the pole-pairs number S of the primary winding fundamental magnetic motive force meet the following relationship: P=Q+ / -S. The ring winding magnetic field modulation linear motor can be applied to low speed, great acceleration, high output thrust and other situations.

The invention discloses a cabin door switch of an unmanned aerial vehicle driven by double-insurance cutting machines. The cabin door switch comprises a cutting machine body, a locking hook, a jacket, cutting machines and a top latch, and is mainly applied to opening the cabin door of the unmanned aerial vehicle; by utilizing propulsive force of the cutting machine, the locking hook is pushed to be separated from a buckling ring of a cabin door cover; and by using the double cutting machine machines, the reliability of the cabin door switch is improved. The switch is small in size, is easy to control and is high in reliability.

The invention relates to a hydraulic circuit of a solid-liquid engine in-situ calibration power source. The hydraulic circuit comprises an oil tank, an electromotor, a coupler, a plunger pump, an oil return filter, an air cooler, a one-way valve, a safety overflow valve, an in-line filter, an electro-hydraulic proportional overflow valve, a pressure sensor, a manual operator, an electromagnetic valve, a servo actuator and a thrust sensor; the electromotor drives the plunger pump to rotate through the coupler; oil in the oil tank enters the one-way valve via the plunger pump and then is divided into two ways, wherein one way flows back into the oil tank via the safety overflow valve, the air cooler and the oil return filter, and the other way passes through the in-line filter and then is divided into two branches, the branch (1) communicates with the electromagnetic valve and the branch (2) enters the oil tank via the electro-hydraulic proportional overflow valve, the air cooler and the oil return filter; and in a working process of the hydraulic circuit, the effect of continuously regulating thrust force of the servo actuator is realized through regulating the manual operator. The hydraulic circuit has the advantages that the thrust control precision is high, the servo actuator operates stably, the operation is safe and the use is convenient and quick, and a stepless pressure regulation function can be realized.

The invention provides a gravity balance difference pumping unit which comprises a frame, an upper platform fixed to the top end of the frame, a first drive oil cylinder, a second drive oil cylinder, gravity combination rollers, a drive oil cylinder pull rope, a balance weight pull rope, a pumping rod, balance weight iron and a hydraulic pump station. The first drive oil cylinder and the second drive oil cylinder are mounted on the front side and the rear side of the frame respectively, a piston rod of the first drive oil cylinder and a piston rod of the second drive oil cylinder are connected with a first movable pulley and a second movable pulley respectively, and the first movable pulley and the second movable pulley can slide up and down on a movable pulley slideway of the frame. The upper platform is connected with a supporting wheel and a front bearing gravity wheel. The drive oil cylinder pull rope is wound around the movable pulleys, the supporting wheel and the front bearing gravity wheel and fixedly connected to the gravity combination drive rollers. One end of the balance weight pull rope is connected with the balance weight iron, and the other end of the balance weight pull rope is wound around the supporting wheel and fixedly connected to the gravity combination rollers and connected with the pumping rod; under the action of the gravity combination rollers, the balance weight iron slides up and down along the slideway of the frame through the rollers on the two sides. According to the gravity balance difference pumping unit, output power is larger, a long stroke is reached, and the technical problems that a conventional pumping unit is low in efficiency and high in energy consumption.

The invention discloses a two-way pneumatic hot air shutoff gate and solves the problem that the conventional shutoff gate is not applicable to large units. The two-way pneumatic hot air shutoff gate is characterized in that two partition gates are combined together, wherein a cooling air inlet and an emergency pull rod are arranged on each partition gate, and a limit indicator is arranged on one driving cylinder; an ash discharge pipe is arranged in a framework; a gate opening booster can be further arranged at a joint of the two partition gates. Double cylinders are adopted to drive each gate sheet, the gate sheet is closed and locked gradually through automatic track transferring motion, large thrust output is realized, the control is flexible, the operation is stable, and sealing is tight; ash accumulation on tracks and a sealing surface is prevented by the aid of the ash discharge pipe; a pneumatic driving device opens or closes the gate and locks the gate sheets, opening and closing are flexible, reverse thrust compensation is realized by the gate opening booster when the gate is opened, and jamming is prevented; the two-way pneumatic hot air shutoff gate is simple in system, low in energy consumption, stable in operation, simple to operate and the like, fundamentally solves the problems of untight and non-flexible opening and closing, high probability of getting stuck, serious leakage and the like of other shutoff gates, and is particularly suitable for large thermal generator sets.

The invention discloses a non-overlapping winding double-side AC linear motor, belongs to the field of motors, and aims at solving problems that a primary winding of a conventional double-side flat-shaped three-phase linear induction motor cannot be manufactured in a segmented manner because the primary winding of a conventional double-side flat-shaped three-phase linear induction motor employs amode that two coils are embedded into the same groove, and the primary winding cannot be used for a long-travel occasion. The linear motor comprises primary coils two sides and a secondary coil, wherein there is a gap between the double-side primary coil and the secondary coil. The primary coil at each side comprises a primary iron core and a primary winding. The surface, located at the side of the gap, of each primary iron core is provided with slot in a lateral direction. The formed big teeth, shallow grooves, small teeth and deep grooves are arranged in a movement direction. The spacing ts2of the big teeth and the polar distance Tau(p) meet a relation: 3*ts2=4*Tau(p). The width of the big teeth bs2, the spacing ts1 of the small teeth and the width of the small teeth bs1 meet the relation: bs2=3*ts1+bs1. The motor reduces the low-order harmonics of the magnetomotive force and electromotive force, shortens the end parts of the windings, improves the efficiency and reliability, facilitates the segmentation at an initial stage, and is suitable for the high-speed, high-acceleration and large-output-thrust occasions.

The present invention discloses a dumbbell shaped stator linear ultrasonic motor which comprises a stator, a mover and a cabinet, characterized in that: the whole shape of the stator is like a dumbbell. The stator is designed with a dumbbell shape, and the stator base can be design to an integer, thus the structure dimension of the motor can be flexibly designed based on requirement. By adjusting the middle and two ends plane dimension, combination of two vibration frequency can be realized, meanwhile the problem of the selected mode having a large frequency difference with other order modes can be solved, the influence brought by stray mode and parasitic mode, the internal stress and stress gradient of the piezoelectric ceramic vibrator can be decreased, the vibrator can be prevented from crash, the motor reliability can be improved as well. Furthermore, due to large mass centralized at dumbbell shaped stator end part, the output pushing force is large with improved output power.

The invention discloses a hydraulic cylinder which comprises a cylinder block, an inner rod and a piston rod. Hydraulic oil with a first pressure is conveyed in a fast cavity through a fast liquid inlet pipe and a fast channel so as to drive the piston rod to fast extends out within the displacement range needing to fast extend out. Hydraulic oil with a second pressure is conveyed in a pressing cavity through a pressing channel and a pressing liquid inlet pipe to fast increase the output thrust of the piston rod and enable the piston rod to extend out slowly. When the piston rod is about to completely extend out, a valve element moves along with the piston rod to be propped against the bottom wall of the inner side of the cylinder block, and the valve element overcomes the elastic force ofan ejecting spring to move upwards under the resistance of the bottom wall of the inner side of the cylinder block and open a pressure relief hole. The hydraulic oil with the second pressure in the pressing cavity flows into a pressure relief cavity through a transition cavity and the pressure relief hole to fast reduce the thrust to the piston rod automatically and omit the pressure relief timeof an electrical system and a hydraulic system. When the hydraulic cylinder is applied to a punching machine, the punching efficiency can be improved, the structure of the punching machine is simplified, and the corresponding transmission precision is improved.

The invention discloses a parallel-drive single-phase linear ultrasonic motor which comprises stators, a support base, a mover and a mover supporting device for supporting the mover. Each of the stators comprises a stator seat, an elastic body, a piezoelectric ceramic and an elastic component. One end of the stator seat is connected to the support base, the other end is connected to one end of theelastic body through the elastic component, the other end of the elastic body is connected to the mover, the elastic body is provided with a hollow portion for connecting the piezoelectric ceramic, the elastic component is used for allowing an end part of the elastic body to press the mover, and the multiple stators are circumferentially and evenly distributed on the support base with the axis ofthe mover as a center. After the piezoelectric ceramic of the present invention is energized, the high-frequency vibration of the piezoelectric ceramic and the elastic body is excited, and the high-frequency vibration of the elastic body is converted into linear motion of the mover by friction. The output thrust is increased by driving the same mover with a plurality of stators in parallel, onlysingle-phase alternating current for power supply is needed, and the change of the moving direction of the motor can be realized by changing the frequency of a power supply.

The invention relates to a novel pressure-accumulation underwater moving object attitude control system which is provided with a main stream pipe, wherein the front, back, left and right surfaces of the main stream pipe are respectively provided with a water-absorbing hole matrix; the lower part of the main stream pipe is connected with one end of a pressure line, and the other end of the pressure line is connected with a pressure-accumulation bin; the pressure line is sequentially provided with a pressure pump and a one-way valve from the main stream pipe to the pressure-accumulation bin; the pressure pump is connected with a pressure differential controller; the pressure-accumulation bin is provided with a plurality of expansion ports; the expansion ports connect actuating mechanisms with the pressure-accumulation bin through rubber hoses; each actuating mechanism comprises a control actuator and a ceramic valve; and each control actuator is provided with a synchronous motor and a synchronous motor controller. The quantity, mounting positions and mounting directions of the actuating mechanisms can be changed to control the degree of freedom of any dimension, and thus, the system has the advantages of high generated thrust, accurate attitude control and the like. The system has small structural volume, and can satisfy the demands of underwater moving object attitude control for miniaturization and integration.

The invention discloses a hydraulic transmission mechanism and a servo numerical control hydraulic fast punching machine with the hydraulic transmission mechanism. The hydraulic transmission mechanismcomprises a base, a hydraulic cylinder and a toggle mechanism. During a punch forming process, an oil pump inputs hydraulic oil into a fast cavity to drive a piston rod to quickly stretch out from acompletely mold opening position to a displacement range when an upper die arranged on a sliding table stretches a to-be-punched panel of a lower die; then the oil pump inputs hydraulic oil into a pressurizing cavity, so that the output thrust of the piston rod is quickly increased, and the piston rod slowly stretches out from a stage that the upper die stretches the to-be-punched panel of the lower die to a stage that the to-be-punched panel is completely stretched; and when the piston rod is about to completely stretch out, a valve element moves along with the piston rod to abut against a bottom wall of the inner side of a cylinder body, the valve element overcomes the elastic force of a top spring under the resistance action of an inner side bottom wall of the cylinder body so as to move upwards and open a pressure relief hole, so that hydraulic oil in the pressurizing cavity flows into a pressure relieving cavity, the thrust on the piston rod is quickly and automatically reduced, the pressure relieving time of electric and hydraulic systems is saved, and the punching efficiency is improved.

The invention discloses a pulse signal acquisition device and method imitating the traditional Chinese medicine pulse diagnosis method. The acquisition device includes a wrist rest, a position adjustment mechanism, a through-axis motor, a transmission mechanism, a pulse sensor, a signal preprocessing circuit, a single-chip microcomputer and a computer; The method of locating the off-position pulse sensor first, and then locating the inch-position and scale-position sensors is adopted, which completely imitates the finger-distributing method of pulse diagnosis in traditional Chinese medicine, and it is easier and more accurate to locate the pulse sensors at the three positions of the inch, close, and ruler at the same time; The pulse signal amplitude judges the validity of the pulse signal collection, so that the pulse signal collection can be automatically started and ended without human intervention. On the basis of accurate positioning, the present invention controls the through-axis motors one by one through the control algorithm, sequentially adjusts the pressing depth of the pulse sensor at the three parts of Cun Guan Chi, realizes the pulse diagnosis technique of "alternating fingers and fingers", and completely simulates the pulse diagnosis of traditional Chinese medicine "Three Departments and Nine Marquises" technique of pulse detection.

The present invention relates to an 8-shaped traveling wave type linear ultrasonic motor and a platform feeding device. A stator assembly includes a friction material, a stator elastomer, a piezoelectric ceramic piece and a flexible printed circuit board; the stator elastomer includes three linear segments parallel to each other; a distance formed between two adjacent linear segments is equal, andends of two adjacent linear segments are connected smoothly via arc segments to form a sealed 8-shaped structure; with the linear segment located at a middle position as a symmetric axis, adjacent arc segments are also symmetric; a surface of each linear segment is higher than a surface of each arc segment; the piezoelectric ceramic piece is matched with the stator elastomer in shape and partitioned for polarization; movers are suspended on surfaces of the linear segments of the stator elastomer; and a contact portion of each mover with the stator elastomer is a transverse portion of an I-shaped structure. According to the 8-shaped traveling wave type linear ultrasonic motor and the platform feeding device provided by the present invention, the stator elastomer is stressed more symmetrically, the fragmentation probability of the piezoelectric ceramic piece is reduced, the output thrust force and self-locking force are larger, the output efficiency is higher, and more excellent stability and controllability are achieved.

The invention discloses a quasi-sinusoidal winding linear motor and belongs to the technical field of linear motors. The quasi-sinusoidal winding linear motor aims to solve the problems that due to the mutual intersection of the ends of coils of all phases of windings, existing panel type three-phase linear permanent magnet synchronous motors are high in copper consumption, high in manufacturing cost and large in thrust ripple. According to the quasi-sinusoidal winding linear motor, a primary winding is an m-phase winding, wherein m is the phase of the motor; m winding coils are sequentially and closely arranged in the relative movement direction within each polar distance range of a primary iron core, each winding coil is rectangular and is wound around the outer surface of the primary iron core, the cross section of each winding coil in the winding direction is a parallelogram, and a quasi-sinusoidal structure is formed on the air gap side of the primary iron core; the arranging methods, within all the polar distance ranges of the primary iron core, of the m winding coils are the same, and all the winding coils on the primary iron core form an m-phase winding. The invention discloses the linear motor.

The invention discloses an axial plunger buoyancy pump, which comprises a drive mechanism and a ball screw driven by it, and is characterized in that the drive mechanism drives a sleeve to rotate, and the sleeve is sleeved on the ball screw The two are fixed on the nut, the front end of the sleeve is supported by a thrust ball bearing, the rear end of the sleeve is supported by an angular contact ball bearing, and the middle part of the sleeve is supported by a deep groove ball bearing. The contact ball bearing, the deep groove ball bearing and the thrust ball bearing are all installed in the bearing housing; the front end of the screw of the ball screw is fixed with a plunger, and the plunger is sealed and installed in the plunger cylinder. An end cover is fixedly connected to the front end of the plunger cylinder, and an outer oil bag is fixedly connected to the front end of the end cover, and the outer oil bag, the end cover, the plunger cylinder and the plunger constitute a A sealed cavity, hydraulic oil is injected into the sealed cavity, and the rear end of the plunger cylinder is fixedly connected with the front end of the bearing seat. The invention has large pressure bearing capacity and high working efficiency.

The invention relates to a runway type traveling wave type linear ultrasonic motor, a single-platform feeding device and a double-platform feeding device. The ultrasonic motor comprises a stator assembly and a rotor. The stator assembly comprises a friction material, a stator elastomer, piezoelectric ceramic pieces and a flexible printed board which are stacked in sequence from top to bottom. Thestator elastic body is in an oval runway shape and comprises two parallel straight line sections, the ends of the adjacent straight line sections are smoothly connected through arc sections to form aclosed structure, the two straight line sections and the two arc sections are symmetrically arranged, and the surfaces of the straight line sections are higher than the surfaces of the arc sections. The piezoelectric ceramic pieces are also arranged in an oval runway shape and are polarized in a partitioned mode. The rotor is of a cantilever beam structure and is suspended above the linear sections of the stator elastomer; the rotor is arranged in a long strip shape, and the part, making contact with the stator, of the rotor is H-shaped. Compared with an existing ring beam type traveling wavetype linear ultrasonic motor, the disclosed ultrasonic motor is larger in output thrust, higher in output efficiency and more excellent in stability and controllability.

The invention relates to the technical field of valves, and particularly relates to a self-operated nitrogen seal valve. The self-operated nitrogen seal valve comprises a valve body and a pneumatic actuator mounted at the top of the valve body, wherein a diaphragm is mounted in the pneumatic actuator and divides the interior of the pneumatic actuator into a transmission cavity and an exhaust cavity; a clamping sleeve is mounted in the center of the diaphragm; a push rod is mounted in the clamping sleeve; and a driving rod is mounted at one end of the push rod. Through the structural design ofthe self-operated nitrogen seal valve, self-operated adjustment of the valve body is achieved, the diaphragm does not occupy the internal space area of the pneumatic actuator, the space utilization rate is increased, meanwhile, the output thrust of the driving rod is large, a valve rod is controlled to move conveniently, and the transmission working efficiency is improved.

The invention discloses a pressure cylinder. The pressure cylinder comprises a cylinder body, a first piston component and a second piston component; the first piston component comprises a first rod part, a first piston part and a piston hole, and the lower end part of the first rod part and the first piston part are connected with the cylinder body in a sealing and sliding fit manner; the secondpiston component comprises a second rod part and a second piston part, the second piston part is connected into the piston hole in a sealing and sliding fit mode, and the second rod part is connectedwith the cylinder body in a sealing and sliding fit mode; and a pressurizing conical surface is arranged at the lower end of the second rod part, a pressurizing ball is embedded in the cylinder body,and a pressure conical surface is arranged at the upper end of the piston hole, so that the pressure conical surface abuts against the pressurizing ball and drives the pressurizing ball to move towards the second rod part, and then the second piston part is driven to move upwards. According to the pressure cylinder, the output thrust can be greatly improved, then the clamping force for clamping aworkpiece is improved, the structure is compact, the size is small, and the space can be saved.

The inertial piezoelectric motor, control method and scanning probe microscope of the present invention include a driving piezoelectric body, a slide bar, and a spring sheet, and are characterized in that they also include an auxiliary piezoelectric body, and the spring sheet connects the two sides of the slide bar. The end and the deformed two ends of the auxiliary piezoelectric body are elastically pressed together, and the auxiliary piezoelectric body or slide bar is fixed to one end of the deformed two ends of the driving piezoelectric body. When the motor is at rest, the gripping force on the slide bar is a large static friction force, the motor has strong anti-interference ability and high stability; The friction resistance decreases, and at this time, a large part of the inertial force generated by the rapid deformation of the driving piezoelectric body is transferred to the output thrust, and the motor steps powerfully. The present invention retains the advantages of simple structure, high precision, large working temperature range, and low processing precision requirements of the inertial piezoelectric motor, but solves its shortcomings of low rigidity, low compactness, and small output thrust, and is suitable for low temperature, ultrahigh Work under extreme conditions such as vacuum and strong magnetic field.

The invention discloses a double-primary coplanar multiphase linear permanent magnet synchronous motor, belonging to the technical field of motors. The invention aims to solve the problems of large secondary structure deformation, poor rotor stability, low thrust density and poor dynamic response when an existing double-side secondary coreless structure linear permanent magnet synchronous motor outputs large thrust. The double-primary coplanar multiphase linear permanent magnet synchronous motor comprises two primary units, a secondary unit, a rotor supporting mechanism and an engine base, wherein each primary unit comprises a primary winding and a primary substrate on which the primary winding is arranged; the secondary unit comprises an upper secondary unit, a lower secondary unit and a middle supporting plate; the two primary windings are arranged on the left side and the right side of the primary substrate respectively and are correspondingly connected in series, and phase differences exist between the corresponding phase windings in a movement direction; and the secondary unit is of a bilateral structure and arranged on the two sides of the primary units, and two air gaps are formed between the primary units and the secondary unit. The invention is applicable to the linear permanent magnet synchronous motor.

The invention belongs to the technical field of high-voltage plasma science, and discloses a graphene-coated wire-airfoil electrode ion wind solid-state propulsion system. The system comprises wire electrodes, airfoil electrodes, an insulating frame and a high-voltage power supply, the airfoil electrodes are fixed on the insulating frame, the wire electrodes and the airfoil electrodes are arranged in parallel at an interval, the wire electrodes and the airfoil electrodes are coated with graphene, the wire electrodes are connected with the high-voltage positive electrode output end of the high-voltage power supply, the airfoil electrodes are connected with the high-voltage negative electrode output end of the high-voltage power supply, and the number of the wire electrodes and the number of the airfoil electrodes are the same and are not less than two. and the wire electrodes and the airfoil electrodes are arranged in a one-to-one correspondence mode. The system has the beneficial effects that the device is simple in structure, easy to manufacture and convenient for later maintenance, has the advantages of low working noise, low carbon emission, large output thrust and the like, and is suitable for small and micro aircrafts.