47results about How to "Large output thrust" patented technology

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 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 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 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 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 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 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.