16 results about "Elliptic motion" patented technology

The invention belongs to the technical field of piezoelectric driving, and relates to a piezoelectric driver, a working method thereof and a driving mechanism. The piezoelectric actuator is mainly composed of a driving body, a driving foot, a pre-tightening force mechanism and a bolt. The driving body generates a non-resonance induction mode and brings first direction displacement and second direction displacement to be generated near a resonance mode under the excitation of a plurality of paths of driving electric signals due to the synergistic strain effect of a plurality of piezoelectric bodies, and the tail end of the driving foot forms an elliptical motion track through the synergistic effect of the displacements in two orthogonal directions. The driving mechanism comprises a piezoelectric actuator, a sliding block, a carrying platform and a fixing mechanism, the piezoelectric actuator is fixed to the sliding block and moves together with the sliding block during driving, a fixed piezoelectric actuator in a traditional scheme is converted into a moving part, and the advantages of being long in stroke and large in thrust are achieved. According to the invention, the beneficial effects of wide frequency band, large output and high-precision driving can be achieved, and miniaturization of a driving system is facilitated.

The invention provides a single-shaft elliptical vibration exciter capable of adjusting a motion trail, a vibrating screen and a feeder, and relates to the technical field of vibration exciters. The single-shaft elliptical vibration exciter is mainly composed of a motor, a bottom plate, a rotating shaft, an eccentric sliding block and an adjustable elliptical assembly, when the single-shaft elliptical vibration exciter works, the motor drives the rotating shaft to rotate, a rolling wheel abuts against the inner ring face of a deformation ring under the action of centrifugal force, the eccentric sliding block is forced to do elliptical motion in the radial direction of the rotating shaft, and the centrifugal force generated by the eccentric sliding block is transmitted to the bottom plate; and therefore, the bottom plate generates vibration with an elliptical motion trail. According to the vibration exciter, the oval shape of the inner ring face of the deformation ring can be adjusted at will, then the vibration exciter generates oval vibration meeting the material screening requirement, and the screening effect on different materials is effectively improved. Due to the fact that the shape of the inner ring face of the deformation ring is visible, the shape and the vibration angle of the elliptic motion trail can be specifically adjusted under the condition that the machine is not stopped. In addition, the invention has the characteristics of high energy efficiency ratio and long service life of the bearing.

Various embodiments include a piezoelectric actuator for driving motion of a deformable lens. The piezoelectric actuator may include a frame coupled with piezoelectric elements. According to some embodiments, the piezoelectric elements may be activated to produce relative elliptical motion between portions of the frame. The relative elliptical motion may modulate friction between surfaces of the frame, so as to drive motion of at least a portion of the deformable lens.

The invention provides a single-shaft type vibration exciter with an elliptic motion trail and a vibrating screen, relates to the technical field of vibration exciters, and mainly aims to solve the problem that the elliptic motion trail and the vibration angle of a three-shaft vibration exciter in the prior art cannot be specifically adjusted. The single-shaft type vibration exciter is mainly composed of a motor, a rotating shaft, an eccentric sliding block, a replaceable oval template and a base, when the motor drives the rotating shaft to rotate, a rolling wheel abuts against an oval cylindrical surface under the action of centrifugal force, the eccentric sliding block is forced to do oval motion in the radial direction of the rotating shaft, and the centrifugal force generated by the eccentric sliding block is transmitted to the base; therefore, the base generates vibration with an elliptical motion trail. Due to the fact that the elliptic cylindrical surface is in an elliptic shape meeting the material screening requirement, and the installation angle of the elliptic cylindrical surface is adjustable, accurate control over the elliptic motion trail and the vibration angle can be visually and concrete achieved. In addition, the single-shaft type vibration exciter and the vibrating screen have the advantages of being high in energy efficiency ratio and long in bearing service life.

The application discloses a cage type dynamic-rotor integrated piezoelectric actuator and a control method thereof. The actuator comprises three parts of a ring-shaped piezoelectric vibrator, a fixed holder and a circular arc slide rail. Two driving feet are symmetrically arranged on the outer side of the ring-shaped piezoelectric vibrator in the diametric direction, and two rotating shafts are arranged in the vertical direction. A plurality of piezoelectric ceramics are symmetrically attached to the grooves on the two sides of the circular ring. The working principle of the application is that two different vibrations are generated by the piezoelectric vibrator, and after coupling, an elliptical motion is output at the driving feet, and the rotation is driven through the reaction force of the friction. The application innovatively designs a stator-rotor integrated piezoelectric rotary actuator. The piezoelectric vibrator is not only a driving power source, but also a motion mechanism, so that the structure and function are integrated, an additional rotor and a fixing device are not needed, the overall structure of the actuator is simplified, and the weight of the actuator is reduced.

The invention discloses a novel underwater robot based on a patch type piezoelectric transducer, and relates to the field of piezoelectric driving. The device comprises a patch type piezoelectric transducer, a clamping structure, a base body, two tension springs, four bearings, a first axle, a second axle, four wheels and two bearing boxes. The patch type piezoelectric transducer is fixed between two vertical plates of the base body through a clamping structure, two wheel shafts of the wheel are clamped in wheel shaft holes of the base body through bearings and limiting gaskets, and two tension springs are hung on bolts on the two sides of the base body and are in a stretching state, so that two plane driving feet at the bottom of the piezoelectric transducer abut against the two wheel shafts. When the robot works, the patch type piezoelectric transducers are excited, the two plane driving feet at the bottoms of the patch type piezoelectric transducers generate elliptical motion in the same direction, the two wheel shafts are driven to rotate through friction, then the wheels are driven to rotate, and movement of the robot is achieved. According to the technical scheme, the problems that an existing underwater robot is large in size, complex in structure and difficult in dynamic sealing in the high-water-pressure environment are solved.

The invention discloses a vibration driving micro-robot for narrow environment detection based on machine vision, and belongs to the field of narrow area detection. Aiming at the problem that the narrow area is difficult to detect, the novel device is designed, the structure is simple, meanwhile, a self-powered micro power supply is carried, and the condition of the narrow area is uploaded to the cloud in real time through visual navigation flaw detection and visual defect analysis. The invention discloses a vibration-driven micro-robot for narrow environment detection based on machine vision. The vibration-driven micro-robot comprises a camera assembly 1, a robot main body assembly 2 and a robot leg assembly 3, by exciting a first-order bending vibration mode, the tail end of the leg forms an elliptical motion track, the amplitude, frequency and motor phase difference are adjusted through PWM waves, multiple motion modes are achieved, a battery is arranged in the main body module, an external power source is not needed, and a camera is carried to construct a whole-process closed-loop crack analysis system. And the method is of great significance in improving the application of the micro-robot in narrow area detection.

The application belongs to the technical field of vibrating screening devices, and discloses a single-machine driving energy-saving horizontal elliptical vibrating screen and a parameter determination method thereof. The single-machine driving energy-saving horizontal elliptical vibrating screen comprises a vibration exciter, an outer mass body, an inner mass body, a shearing rubber spring and a vibration isolation spring. The vibration isolation spring is connected to a foundation and a main mass body. The vibration exciter is located at the centroid of the outer mass body and is composed of an eccentric rotor and an induction motor. The vibration exciter rotates around the center of its rotation axis, thereby generating a vibration excitation force to make the inner mass body generate a certain vibration intensity. The movement track of the inner mass body is an elliptical movement. According to the use requirement, a corresponding number of inner mass bodies can be installed to improve the production rate and reduce the power consumption, thereby realizing the engineering application value.

The invention discloses a piezoelectric-driven bionic sea turtle underwater swimming robot and a control method thereof, relates to the field of underwater robots, and solves the problems of poor driving flexibility, high energy consumption and insufficient silence in the prior art. The robot comprises a main body driving assembly and anterior and posterior limb driving assemblies; the main body driving assembly comprises a main body piezoelectric vibrator composed of a main body piezoelectric vibrator base body and four ceramic pieces, the limb driving assembly comprises a limb piezoelectric vibrator composed of a limb piezoelectric vibrator base body and two ceramic pieces and a hydrofoil, and the limb piezoelectric vibrator and the hydrofoil are assembled in a pre-tightening mode through a tension spring. During control, the forelimb and the main body electric vibrator respectively apply two-phase simple harmonic signals with phase difference, and the two-phase simple harmonic signals cooperatively vibrate to generate relative elliptical motion to drive the hydrofoil to backwards push water to obtain propulsive force; then the limb position recovery is realized by the inverted main body piezoelectric vibrator; the robot continuously advances in a reciprocating alternating mode of propelling and recovering; a simple harmonic electric signal is applied to one of the two forelimbs to realize yawing movement of the forelimb. The robot is compact in structure, accurate in movement, low in consumption, mute and high in flexibility.

The application discloses a high-viscosity fluid piezoelectric ultrasonic atomization device, which comprises a piezoelectric ceramic base, the bottom side of the piezoelectric ceramic base is fixedly connected with a piezoelectric ceramic, a variable amplitude plate is eccentrically fixed to the top side of the piezoelectric ceramic base and can amplify high-frequency vibration generated by the piezoelectric ceramic inverse piezoelectric effect, a plurality of pipe grooves are arranged at the end of the variable amplitude plate corresponding to vibration transmission, light holes communicating with the side walls of the pipe grooves are arranged at the two side ends of the variable amplitude plate, clamping limiting pieces are connected to the light holes and used for positioning metal liquid passing pipes in the pipe grooves, based on the eccentric layout of the variable amplitude plate, micro-elliptical motion can be formed at the vibration end of the variable amplitude plate, the high-viscosity fluid in the metal liquid passing pipe can alternately present positive pressure and negative pressure, and then transient cavitation and liquid flow are excited and generated, the application has the advantages of simple structure, convenient use, solution to the problem of effectively atomizing high-viscosity fluid at low cost and suitability for atomization scenes of high-viscosity fluid which cannot be diluted or atomized after being heated.

The present invention relates to the technical field of elastic rubber detection, and discloses an elliptical motion mechanism and a simulated three-dimensional loading test device. The elliptical motion mechanism includes a workbench, in which a first adjustment mechanism, a second adjustment mechanism, and a third adjustment mechanism are arranged. The first adjustment mechanism includes a slider A, a screw A, a support A, and a pin A. The second adjustment mechanism includes a support B, a pin B, a screw B, and two sliding assemblies. The sliding assemblies include the slider B, a slide bar, and a rotating pin. The third adjustment mechanism includes a support C, a slider C, a screw C, and an output shaft. When power is input to rotate the pin A and the slider A, the third adjustment mechanism can output the motion of an elliptical trajectory on the output shaft, and the parameters of the output elliptical trajectory can also be adjusted. The three-dimensional loading test device includes the above-mentioned elliptical motion mechanism and a vertical actuator. It only requires two prime movers to simulate three-dimensional loading conditions, is relatively inexpensive, and has a simple control scheme.

The application discloses a patch type spherical rotor multi-degree-of-freedom ultrasonic motor and an excitation method thereof. The ultrasonic motor comprises a piezoelectric vibrator, a base, a spherical rotor and a pre-tightening module. The piezoelectric vibrator comprises a stator and a piezoelectric ceramic sheet. The stator comprises a first base body, a second base body and first to fourth driving feet. The base comprises a fixing cylinder and a web. The pre-tightening module comprises a threaded rod, a bearing, a bearing seat, a clamping hemisphere, a spring, a pre-tightening nut and a gasket. Different excitation signals are applied to the piezoelectric ceramic sheet, so as to excite two modes of an axial symmetric bending mode and two orthogonal axial bending modes of the stator, thereby coupling to form a micro-elliptical motion on the four driving feet, and the spherical rotor is driven by friction to rotate in three degrees of freedom. The application can realize three degrees of freedom rotation, has the advantages of adjustable pre-pressure, simple and compact structure, no electric self-locking, easy miniaturization and the like.

For a piezoelectric actuator used to linearly drive a driven element by inducing elliptical motion in a vibrating element through vibration of the piezoelectric element, a drive device is provided that improves control at very low speeds and / or enables the use of a smaller boost circuit to provide the drive voltage for the piezoelectric actuator. According to one embodiment, a drive device for axially driving a driven element is provided. The driving device includes: a piezoelectric actuator, wherein the piezoelectric actuator includes a vibrating element in contact with a driven element and one or more sets of piezoelectric elements attached to the vibrating element; and a controller, wherein each set of piezoelectric elements includes one or more piezoelectric elements, and in each set of piezoelectric elements, a first electrode for expanding or contracting a first region of the piezoelectric element in the set of piezoelectric elements and a second electrode for expanding or contracting a second region of the piezoelectric element in the set of piezoelectric elements are arranged along the axial direction, wherein in each set of piezoelectric elements, a common third electrode or a separate third electrode paired with the first electrode and the second electrode is provided, such that the vibrating element of the piezoelectric actuator has: a bending mode, wherein the middle portion along the axial direction becomes convex or concave, thereby causing the ends of the vibrating element to move along the axial direction at both ends; and an expansion / contraction mode, wherein one end expands / contracts at both ends of the axial direction, while the other end expands / contracts with opposite phases over time, thereby causing the ends of the vibrating element to move in a direction perpendicular to the axial direction. The controller is used to cause the vibrating element to vibrate by applying oscillating voltage signals of the same frequency to the first and second electrodes, thereby driving the driven element in contact with the vibrating element along the axial direction. When the oscillating voltage signals applied to the first and second electrodes are in phase, a first mode of vibration based on the bending mode is generated in the vibrating element; when the oscillating voltage signals applied to the first and second electrodes are in opposite phase, a second mode of vibration based on the expansion / contraction mode is generated in the vibrating element, wherein the controller is used to control the speed of the driven element by controlling the phase difference between the voltage signals applied to the first electrode and the voltage signals applied to the second electrode. Another aspect of the invention provides a small boost circuit for providing a drive voltage for a piezoelectric actuator.

The vibrating screen (PV) has a screen platform (11), two side walls (12) and a mechanical vibrator (VM) which consists of two members (20), which rotate at the same rotation and in opposite directions, where each of the end sections (20a) of each member (20) carries an eccentric weight (30) and is supported on bearings (21) which are supported on the side walls (12) of the vibrating screen (PV). The members (20) have their end portions (20a), one next to the other, which are supported on bearings (40) which are fixed to a same bearing housing (50) which is fixed to beams (13), transverse and with opposite ends fixed to the side walls (12) of the vibrating screen (PV).Each end portion (20a) of one member (20) carries an eccentric weight (30) with a total mass different from that of the eccentric weights (30) of the end portions of the other member (20), said members (20) rotating in defined phases, defining the inclination of the main axis of an elliptical movement which is transmitted to the sieve platform (11).

The invention discloses a novel underwater robot based on a sandwich type piezoelectric transducer, and relates to the field of piezoelectric driving. The device comprises a sandwich type piezoelectric transducer, a clamping structure, a base body, two tension springs, four bearings, a first axle, a second axle and four wheels. The sandwich type piezoelectric transducer is fixed between two vertical plates of the base body through a clamping structure, two wheel shafts of the wheel are clamped in wheel shaft holes of the base body through bearings and limiting gaskets, and two tension springs are hung on bolts on the two sides of the base body and are in a stretching state, so that two plane driving feet at the bottom of the piezoelectric transducer abut against the two wheel shafts. When the robot works, the sandwich type piezoelectric transducer is excited, the two plane driving feet at the bottom of the sandwich type piezoelectric transducer generate elliptical motion in the same direction, the two wheel shafts are driven to rotate through friction, then the wheels are driven to rotate, and movement of the robot is achieved. According to the technical scheme, the problems that an existing underwater robot is large in size, complex in structure and difficult in dynamic sealing in the high-water-pressure environment are solved.

The application provides a single-shaft elliptical vibration exciter with adjustable motion track and a vibrating screen and a feeder, and relates to the technical field of vibration exciters. The single-shaft elliptical vibration exciter is mainly composed of a motor, a bottom plate, a rotating shaft, an eccentric sliding block and an adjustable elliptical component. When working, the motor drives the rotating shaft to rotate, the rollers are pressed on the inner ring surface of the deformation ring under the action of centrifugal force, the eccentric sliding block is forced to make elliptical motion along the radial direction of the rotating shaft, and the centrifugal force generated by the eccentric sliding block is transmitted to the bottom plate, so that the bottom plate generates vibration with an elliptical motion track. The elliptical shape of the inner ring surface of the deformation ring can be adjusted arbitrarily, and the vibration exciter generates elliptical vibration meeting the requirements of material screening, thereby effectively improving the screening effect on different materials. Since the shape of the inner ring surface of the deformation ring is visible, the shape of the elliptical motion track and the vibration angle can be adjusted concretely without stopping the machine. In addition, the application has the characteristics of high energy efficiency ratio and long service life of bearings.