393 results about "Longitudinal vibration" patented technology

The invention discloses an anti-jamming coal mining drilling machine with drilling and multidirectional impacting functions and a using method thereof.The anti-jamming coal mining drilling machine comprises a drilling machine body, a high-pressure driving mechanism is arranged on the drilling machine body through a multidirectional guide rail mechanism, and a drilling assembly is connected with the high-pressure driving mechanism; when the drilling machine works, the high-pressure driving mechanism drives the drill rod and the drill bit to conduct rotary drilling, the high-frequency transverse vibration mechanism synchronously generates transverse high-frequency vibration, the high-pressure driving mechanism drives the drill rod and the drill bit to conduct rotary drilling, and the high-frequency transverse vibration mechanism drives the drill rod and the drill bit to conduct rotary drilling. The friction force between the drill bit and rock is reduced, debris accumulation is prevented, efficient deslagging is achieved, when hard rock or drill jamming occurs, the longitudinal vibration impact mechanism triggers longitudinal vibration, impact and drill jamming prevention functions are achieved through cooperative work of transverse vibration and longitudinal vibration, the drill jamming problem under the complex geological condition is effectively solved, the drilling efficiency and equipment reliability are improved, and the drilling cost is reduced. The device is suitable for drilling operation of mining roofs and baseplates, sides and the like.

The invention relates to an ultrasonic transducer capable of realizing a high torsional vibration-longitudinal vibration amplitude ratio and a design method thereof. The ultrasonic transducer comprises a piezoelectric ceramic vibrator 3, an amplitude-change pole 2 and a tool head 1 which are connected in sequence, the shape of the amplitude-change pole is formed by rotating a specific geometric curve around the axis. The interior of the amplitude-change pole is of a cavity structure 5, the wall thickness distribution of the amplitude-change pole is adjustable, the cavity structure is a through hole or a blind hole, and the shape of the cavity structure is an equal-diameter cavity extending along the axis or a special-shaped cavity formed by rotating a specific geometric curve around the axis. By optimizing the internal cavity structure and the wall thickness distribution and adjusting the amplitude proportion between torsional vibration and longitudinal vibration, the longitudinal vibration of the transducer can be converted into longitudinal torsional vibration, so that the transducer has both longitudinal vibration and torsional vibration. Due to the unique cavity type structure in the amplitude-change pole, the amplitude ratio of generated torsional vibration to longitudinal vibration can be larger, the ultrasonic effect with the high torsional vibration-longitudinal vibration amplitude ratio can be generated, and vibration output with the high torsional vibration-longitudinal vibration amplitude ratio can be achieved.

The invention belongs to the technical field of mechanical transmission, and discloses a conductor ring and magnetic resistance array composite permanent magnet thrust bearing and a damping force calculation method. The conductor ring and magnetic resistance array combined type permanent magnet thrust bearing realizes the bearing of non-contact magnetic thrust through the combination of the eddy current ring and the magnetic group array. When thrust from a propeller at the stern end of a propulsion shafting acts, the rotor magnetic group array axially moves, axial traction force is generated between the rotor magnetic group array and the stator magnetic resistance array to counteract the thrust action from the axial direction, meanwhile, the magnetic group array cuts the vortex ring, induction damping is generated on the surface of the vortex ring, damping force is formed, and the vortex ring is driven to rotate. And therefore, the longitudinal vibration during transmission of the propulsion shafting is reduced, and the propulsion shafting system is more silent and stable during operation. In addition, the damping force calculation method does not need complex three-dimensional structure modeling and grid division, is simple in solution, high in universality and short in calculation time consumption, and has high engineering application practical value.

The embodiment of the utility model belongs to the technical field of track locking mechanisms, and relates to a track locking mechanism and a conveying device, and the track locking mechanism comprises a base, a track supporting seat and a fastening assembly. The base comprises a bottom plate and at least two side plates, the two side plates are oppositely arranged at the two ends of the bottom plate, and a mounting groove is defined by the two side plates and the bottom plate; the track supporting seat is located in the mounting groove and provided with an inclined plane, and an included angle A is formed between the inclined plane and the bottom of the mounting groove; the fastening assembly is arranged on the base in a penetrating mode, and the fastening assembly and the side plates of the installation groove can jointly achieve transverse clamping and longitudinal clamping on the inclined face so as to fix the rail supporting base. When the fastening assembly abuts against the inclined face, force exerted on the inclined face by the fastening assembly is converted into longitudinal force and transverse force. The rail supporting seat is longitudinally clamped by the fastening assembly and the bottom plate and transversely clamped by the fastening assembly and the side plate at the same time, transverse and longitudinal vibration can be resisted, the stability of the rail locking mechanism is maintained, meanwhile, the rail supporting seat does not need to be fixed through a complex device, and the production cost is reduced.

The invention provides a drill string vibration reduction method and device.The method comprises the steps that longitudinal vibration data and torsional vibration data of a target drill string when a vibration reduction tool is tripped into multiple positions are obtained, and the longitudinal vibration data comprise hook load, a mass matrix, a stiffness matrix, a structural damping matrix, a drilling fluid damping effect matrix, a speed vector and an acceleration vector; the torsional vibration data comprises a rotational acceleration vector, a rotational speed vector, a rotational inertia matrix, a torsional rigidity matrix, a torsional structure damping matrix and a torsional drilling fluid damping matrix; the vibration intensity of the whole well section is determined by applying the longitudinal vibration model, the torsional vibration model, the longitudinal vibration data and the torsional vibration data; and according to the vibration intensity of the whole well section, the optimal tripping-in position of the vibration reduction tool is selected from all the positions, the vibration reduction tool is tripped into the optimal tripping-in position, and the vibration reduction process of the target drill column is completed. The reliability of the tripping-in position of the vibration reduction tool can be improved, and then the vibration reduction effect of the drill column can be improved.

The utility model discloses an annular spring composite conical rubber two-stage variable-stiffness vibration double-control support which comprises a horizontal vibration isolation support body, a longitudinal vibration isolation support body and a transverse vibration isolation support body. The vertical vibration isolation support comprises a support upper connecting unit and a support lower connecting unit, the lower part of the support is connected with a unit; the double-stage variable-stiffness vertical vibration isolation unit comprises upper inner ring spring composite conical rubber, lower inner ring spring composite conical rubber and an outer ring spring, and the upper inner ring spring composite conical rubber and the lower inner ring spring composite conical rubber are partially embedded into the outer ring spring from the upper portion and the lower portion respectively. When the two-stage variable-stiffness vertical vibration isolation unit is subjected to first-stage vertical loading, the vibration isolation unit has first-stage vertical stiffness, when the two-stage variable-stiffness vertical vibration isolation unit is subjected to second-stage vertical loading, the vibration isolation unit has second-stage vertical stiffness, and the first-stage vertical stiffness is smaller than the second-stage vertical stiffness. According to the double-order variable-stiffness vertical vibration isolation device, the vertical vibration effect and the horizontal earthquake effect can be isolated at the same time, meanwhile, double-order variable-stiffness vertical vibration control is achieved by means of the combined vibration isolation units of the annular springs and the conical rubber, and the vibration isolation effect is remarkably improved.

The invention relates to an ultrasonic-assisted longitudinal-torsional compound vibration two-roller rolling device, and belongs to the technical field of ultra-thin strip rolling. According to the device, the ultrasonic longitudinal-torsional vibration device is combined with the rolling mill, so that the deformation resistance of materials is effectively reduced, the surface roughness is improved, grains are refined, and the residual stress is reduced by utilizing ultrasonic vibration. The device comprises a rolling mill rack, an ultrasonic longitudinal-torsional vibration device, a winding device, a winding assisting device and an unwinding device. The ultrasonic longitudinal-torsional vibration device is composed of a variable-amplitude roller shaft, a connecting shaft, piezoelectric ceramics, a copper electrode, a rear cover plate and a hexagon socket screw, and has a single-excitation form and a double-excitation form. The single excitation device adopts a quarter-wavelength conical amplitude-change pole, a spiral groove is formed in the conical surface of the quarter-wavelength conical amplitude-change pole, and longitudinal vibration can be partially converted into torsional vibration; according to the double-excitation device, the torsional vibration amplitude is increased through cooperation of two longitudinal-torsional amplitude-change poles which are symmetrically arranged. The device is compact in structure, small in energy loss, high in machining precision and suitable for production of high-precision ultra-thin strips.

The invention relates to a vibration control design method for a ship low-speed motor direct propulsion long shafting, and the method comprises the steps: determining the position of a low-speed motor output flange and the central position of a propeller, determining the positions of a thrust bearing, an intermediate bearing, a tail pipe bearing and the like, arranging the span of the bearings, arranging the number of the bearings, and calculating the shafting strength. Torsional vibration calculation of the long shaft system of the low-speed motor, torsional vibration calculation result analysis, centering calculation of the long shaft system of the low-speed motor, cyclotron vibration calculation of the long shaft system of the low-speed motor, longitudinal vibration calculation of the long shaft system of the low-speed motor, fatigue analysis of a thrust bearing, verification of whether the thrust bearing meets the load requirement or not, shaft system jacking verification, and the like. And finally verifying the shafting vibration control design effect through a navigation test. Different from conventional diesel engine propulsion and high-speed motor propulsion shafting design, the method starts from the characteristics of a low-speed motor direct propulsion shafting, and analysis is carried out through shafting strength design, torsional vibration, centering, rotation, longitudinal vibration, installation and other systems, so that the risks of shafting load imbalance and abnormal vibration are avoided.

The invention discloses a complex profile part ultrasonic vibration grinding device suitable for a surface grinding machine and an operation process thereof, a workpiece is fixed at the output end of a stepped amplitude-change pole of an ultrasonic vibration device through a bolt, and a sliding bearing supporting seat is mounted in the middle of a shell of the ultrasonic vibration device and plays a role in supporting a sliding bearing; the tail portion of the ultrasonic vibration device is fixed to the indexing chuck through a chuck, the servo motor drives the indexing chuck to achieve accurate indexing, and the sliding bearing supporting seat and the indexing chuck are fixed to a surface grinding machine workbench through bolts. The ultrasonic generator is started, a high-frequency electric signal is transmitted to the piezoelectric ceramic transducer assembly through the cable, the high-frequency electric signal is converted into high-frequency longitudinal vibration, and the high-frequency longitudinal vibration is transmitted to the workpiece after being amplified by the stepped amplitude-change pole, so that the workpiece generates high-frequency ultrasonic vibration. Ultrasonic vibration auxiliary grinding of complex surface parts on a surface grinding machine is achieved, the removal rate of grinding materials is increased, the grinding force and the grinding temperature are reduced, and grinding burns are reduced.

The invention discloses a longitudinal bending composite type six-degree-of-freedom piezoelectric active vibration isolation platform and a working method thereof. The vibration isolation platform adopts a modular structural design, a vibration isolation connecting platform and a base platform are sequentially arranged from top to bottom and are connected through four uniformly distributed vibration isolation modules, and each vibration isolation module forms a multi-stage vibration transmission structure through a fixed base, a transducer base, a piezoelectric transducer, an amplitude-change pole, a pre-tightening bolt and a small flexible hinge. The control module collects feedback signals of a first acceleration sensor arranged on the vibration isolation connecting platform and feedforward signals of a second acceleration sensor arranged on the base platform, and outputs 12-channel control signals to the piezoelectric transducers of the vibration isolation modules after signal processing. The piezoelectric transducer is driven to generate a composite motion mode of longitudinal vibration and multidirectional bending vibration, and active suppression of longitudinal vibration and radial bending vibration in any direction of a vibration isolation object is achieved. The device has the advantages of multi-degree-of-freedom vibration isolation, compact structure, lightweight design, independent control, high stability and the like, and has important application value in the fields of space reflecting mirrors, micro-nano manufacturing equipment vibration control and multi-degree-of-freedom vibration isolation systems.

The invention provides a quick calculation method and system for vibration response of a shaft system of a diesel engine, and the method comprises the steps: simplifying a crankshaft system and stress of the diesel engine, and obtaining a simplified model of the diesel engine; on the basis of a straight beam unit, a transverse vibration transfer matrix, a longitudinal vibration transfer matrix and a torsional vibration transfer matrix of a straight beam are established respectively, and a spatial continuum transfer matrix of the straight beam is calculated; establishing a point transfer matrix of coordinate transformation at each section of straight beam connection point through a force balance condition and a displacement coordination condition; lapping a transfer matrix from a single crank to the whole crankshaft system according to the spatial continuum transfer matrix of the straight beam and the point transfer matrix of coordinate transformation; constructing a kinetic equation according to a transfer matrix from a single crank to the whole crankshaft system; calculating the inherent frequency of the crankshaft system according to the kinetic equation; the method comprises the following steps: loading an exciting force map on a crank pin of a crankshaft system, and solving forced vibration response of any point on a crankshaft by using a Newmark-beta method.

The invention belongs to the technical field of buildings, and particularly relates to an anti-seismic and shock-absorbing structure for a beam type bridge, which comprises a main beam and a bridge body, the bottom of the bridge body is fixedly connected with a first fixing plate; a plurality of groups of first fixing plates are arranged at the bottom of the bridge body; the bottom of the first fixing plate is fixedly connected with a damper. A plurality of groups of dampers are arranged at the bottom of the first fixing plate and are uniformly distributed at the bottom of the first fixing plate; the ends, away from the first fixing plate, of the dampers are jointly and fixedly connected with a second fixing plate. According to the step, through arrangement of a first fixing plate, a damper, a second fixing plate, balls, damping springs and a baffle, longitudinal vibration is weakened by the damper, transverse vibration is weakened by the damping springs, and the second fixing plate moves on the top of the main beam through the balls, so that the situation that the damper is twisted and damaged when transverse vibration is transmitted is reduced; the stability of the device during shock resistance and shock absorption is improved, and the service life of parts is prolonged.

The utility model provides a small medical ultrasonic amplitude transformer. The small medical ultrasonic amplitude transformer comprises a base cylinder, a nose cylinder and a cutter bar cylinder. The base cylinder is provided with an internal thread and is used for being detachably connected with a transducer or other external components. The nose portion cylinder axially extends from the front end of the base portion cylinder, two symmetrical and parallel flat portions are arranged on the circumferential face of the nose portion cylinder, and the flat portions are used for being matched with the whole transducer to be installed, so that accurate positioning of the direction of the tool bit is guaranteed, and pre-tightening and fixing during assembly are facilitated. The cutter bar cylinder extends from the front end of the nose cylinder, the front portion of the cutter bar cylinder is of an arc-shaped structure, the vibration mode of the cutter head can be adjusted, bending vibration is overlaid on the basis of longitudinal vibration, and a longer effective cutting line is formed. The cutting edge limited by the multiple cutting faces is arranged on the arc-shaped front portion of the cylindrical cutter bar, the edge width and the cutting area of the cutting edge are larger, and better blood coagulation and sealing effects can be achieved. The cutting face where the cutting edge is located is perpendicular to the extending plane of the flat part so that the vibration direction of the arc-shaped front part can be accurately controlled.

A compact vibratory burrowing probe, particularly beneficial in low gravity space exploration environments, uses lateral or stirring-like vibrations to fluidize a surrounding regolith, thereby decreasing the penetration resistance, and compensating for the light overhead weight to improve the burrowing action of the probe into the surface of the terrain of explored moons, planets, or asteroids. Included is a novel vibratory mechanism capable of imparting the novel lateral or stirring vibration, as well as a more conventionally oriented longitudinal vibration.

The invention relates to the technical field of insulator fault early warning, in particular to an insulator mechanical pulse electrification early warning system. The system comprises a pulse signal acquisition module which is used for setting sampling points at equal intervals at each height of an insulator and acquiring vibration pulse signals of the sampling points; the vibration abnormity identification module is used for determining the transverse vibration abnormity degree and the longitudinal vibration abnormity degree of the vibration pulse signal of each sampling point; the pulse signal denoising early warning module is used for acquiring a standard comprehensive abnormal index of the vibration pulse signal of each sampling point; identifying the non-low-frequency energy intensity of the vibration pulse signal of each sampling point, and adjusting a fixed threshold value in a wavelet denoising algorithm in combination with the standard comprehensive abnormal index so as to perform defect early warning on the insulator by using the denoised vibration pulse signal; according to the invention, the accuracy of defect early warning of the insulator is improved.

The invention relates to the technical field of bearing ring machining, in particular to a bearing ring machining device which comprises a cleaning box and further comprises an ultrasonic generator, a base frame, a transverse and longitudinal vibration synchronous generation component, a transverse and longitudinal vibration synchronous generation component and a transverse and longitudinal vibration synchronous generation component. The transverse and longitudinal vibration synchronous generation component is in transmission connection with a cleaning frame capable of synchronously reciprocating transversely and longitudinally, two symmetrically-arranged bidirectional limiting assemblies are installed between the cleaning frame and the base frame, and the inner wall of the cleaning frame is rotationally connected with a stepping rotating frame. The bearing ring cleaning device has the beneficial effects that through synchronous movement of the cleaning frame in the transverse direction and the longitudinal direction, the bearing ring in the cleaning basket barrel can generate multi-effect movement and vibration, and then the collision strength and the collision efficiency of the bearing ring and brushing liquid are effectively improved; therefore, the cleaning and processing strength and the cleaning and processing efficiency of the cleaning fluid on the bearing ring are effectively improved.

The utility model discloses a multi-dimensional vibration manufacturing test device which comprises a vibration plate, the lower end face of the vibration plate is fixedly connected with a fixing frame, the upper end face of the fixing frame is fixedly connected with a vibration motor, the upper end face of the vibration plate is slidably connected with a second sliding plate, the upper end face of the second sliding plate is slidably connected with a first sliding plate, and the upper end face of the first sliding plate is fixedly connected with a positioning block. The upper end face of the positioning block is fixedly connected with a driving motor, the output end of the driving motor is connected with a rotating shaft, the outer wall of the rotating shaft is fixedly connected with a cam, the whole vibration plate vibrates through operation of the vibration motor, and vibration testing of products on the mounting plate is achieved; the cam is in contact with the movable block in the rotating process and abuts against the movable block to move up and down in a reciprocating mode, the first sliding plate drives the mounting plate to conduct transverse vibration testing, the second sliding plate drives the mounting plate to conduct longitudinal vibration testing, multi-dimensional vibration of the vibration testing device is effectively achieved, and the using flexibility of the device is improved.

In certain embodiments, a surgical handpiece system includes a phacoemulsification tip, a fluid management system, an ultrasonic drive system, and a controller. The phacoemulsification tip is attached to a shaft. The fluid management system is configured to manage inflow and outflow of fluid from an ocular surgical site. The ultrasonic drive system is configured to generate torsional and longitudinal vibrations in the phacoemulsification tip. The controller is configured to analyze applied voltage and current to the ultrasonic drive system using Fast Fourier Transforms (FFTs), and tune applied frequencies of the torsional and longitudinal vibrations according to at least one resonant frequency.

The invention discloses an industrial camera anti-vibration device, and relates to the technical field of industrial camera stabilization, the industrial camera anti-vibration device comprises a mounting frame, the top of the mounting frame is provided with a first anti-vibration mechanism used for horizontal and transverse cushioning, and the bottom of the first anti-vibration mechanism is provided with a second anti-vibration mechanism used for horizontal and longitudinal cushioning; the bottom of the second shockproof mechanism is provided with a third shockproof mechanism for cushioning in the vertical direction, the lower end of the third shockproof mechanism is provided with a fixing mechanism, and the top of the fixing mechanism is provided with a buffer gasket for flexible cushioning and fixing. According to the industrial camera, the vibration in the three directions can be buffered through the first anti-vibration mechanism, then the horizontal and longitudinal vibration is buffered through the second anti-vibration mechanism, and finally the vibration in the vertical direction is buffered through the third anti-vibration mechanism, so that the vibration in the three directions can be buffered, and the vertical height of the industrial camera is flexibly adjusted through the cooperation of the fixing plate and the adjusting plate.

The utility model provides a disc type multichannel ultrasonic sample processing device which comprises a shell, a circular groove is formed in the upper surface of the shell, a reagent tube mold is fixedly installed in the circular groove and is in a circular ring shape, and a reagent tube is slidably connected into the reagent tube mold. A radial vibration disc is slidably connected to the circular ring center of the reagent tube mold, and a longitudinal vibration transducer is fixedly mounted at the bottom of the radial vibration disc. By designing the reagent tube mold, the longitudinal vibration energy converter and the radial vibration disc, when the reagent tube mold is used, the motor is started to drive the longitudinal vibration energy converter and the radial vibration disc to move upwards in the reagent tube mold so as to relieve extrusion on the inner wall of the reagent tube mold, a reagent tube can be conveniently inserted into the reagent tube mold, and then the longitudinal vibration energy converter is started to drive the longitudinal vibration energy converter and the radial vibration disc to move upwards. And the radial vibration disc and the reagent tube are driven to shake, so that samples are uniformly dispersed and mixed, non-contact and non-pollution of the samples are realized, and the samples can be extracted more efficiently and accurately.

A system and method for actively suppressing aircraft wheel brake vibrations determines whether the wheel speed has changed suddenly, thereby preventing landing gear yaw vibrations and cornering difficulties caused by asymmetric brake pressure due to sudden wheel speed changes. By segmenting the aircraft's low-speed taxiing speed and limiting brake pressure based on the speed of each segment, longitudinal vibrations at low speeds are avoided, reducing the probability of vibration at low speeds by 1E-4. During high-speed braking, a wheel deceleration rate control range is established based on the braking torque characteristics, and brake pressure is controlled to achieve constant torque control, avoiding brake vibrations caused by torque variations during high-speed braking due to anti-skid operation. Longitudinal and yaw acceleration sensors are added to the wheel brake system. Braking pressure is limited based on the yaw and longitudinal vibration frequency signals, ensuring that no brake-induced vibrations occur during the entire braking process.

The invention relates to the field of rotary ultrasonic machining, and specifically discloses a longitudinal-bending composite rotary ultrasonic vibration special-shaped amplitude transformer, wherein the amplitude transformer comprises a single-excitation longitudinal vibration input portion, an amplitude transformer transmission portion, a vibration node portion, a dynamic balance vibration separation portion, and a longitudinal-bending composite output portion in order from an input portion to an output portion; wherein the single-excitation longitudinal vibration input portion, the amplitude transformer transmission portion, the vibration node portion, and the longitudinal-bending composite output portion are coaxially arranged, and the single-excitation longitudinal vibration input portion, the amplitude transformer transmission portion, the vibration node portion, and the longitudinal-bending composite output portion are all centrally symmetrical structures, and the dynamic balance vibration separation portion comprises a bending vibrator structure and a longitudinal vibrator structure with different cross-sectional areas, the masses of the bending vibrator structure and the longitudinal vibrator structure are equal, and the centers of mass of the bending vibrator structure and the longitudinal vibrator structure are symmetrically arranged about the axis of the amplitude transformer rotation axis; the invention can change the vibration mode, convert the single-excitation longitudinal vibration into a longitudinal-bending composite vibration, and avoid the problem of dynamic imbalance in the rotation process.

The present invention relates to the technical field of steel structure bridge construction, and proposes a reinforced steel structure bridge, including abutment supports, bridge piers, steel structure bridge decks and guardrails, wherein the lower ends of the abutment supports are fixedly installed on the front and rear sides of the upper ends of the piers by expansion bolts, and the upper ends of the abutment supports are fixedly installed on the front and rear sides of the lower middle part of the steel structure bridge deck by expansion bolts. The shock waves generated by the vibration of the steel structure bridge deck are absorbed by the transverse and longitudinal absorption components, and the longitudinal shock waves of the diagonal support seat are counteracted by springs four and three, thereby counteracting and weakening the longitudinal shock waves generated by the longitudinal steel structure bridge deck vibration, and counteracting the oblique shock waves generated by the steel structure bridge deck vibration, further realizing multi-directional counteracting and weakening of the shock waves generated by the steel structure bridge deck, thereby interfering with the shock waves of the steel structure bridge deck and avoiding resonance.

The invention provides an ultrasonic compound vibration device which is formed by connecting a plurality of vibration elements and can improve the stability of the connection state. The first vibration element (11) and the intermediate vibration element (10) are coaxially connected at one specified connection site at the midsection of the ultrasonic compound vibration device (1), the specified connection site is included in a range of a phase angle of 0.05 [pi] or less with respect to an antinode A (M1) of a standing wave (M1) of the longitudinal vibration and a range of a phase angle of 0.22 [pi] or less with respect to a node N (M2) of a standing wave (M2) of the torsional vibration. Similarly, the intermediate vibration element (10) and the second vibration element (12) are coaxially connected by a mechanical connection mechanism at the other designated connection part.

The invention relates to the technical field of acoustic driving, in particular to a passive ultrasonic resonance driving device. The device comprises a resonant cavity body, a standing wave focusing assembly, a spiral torque assembly and a friction gradient assembly are sequentially arranged in an inner cavity of the resonant cavity body, and the standing wave focusing assembly is used for focusing external incident ultrasonic waves to form standing wave nodes, generating vertical acoustic radiation force and driving a floating ball in the inner cavity of the standing wave focusing assembly to move in the axial direction. The spiral torque assembly is located below the standing wave focusing assembly, and a spiral groove of the spiral torque assembly converts longitudinal vibration into rotating torque. Through 20-100kHz broadband ultrasonic adjustment, the functions of lifting of the standing wave focusing assembly, rotation of the spiral torque assembly and sliding of the friction gradient assembly are activated in sequence, the function singleness of a traditional passive acoustic device (such as acoustic tweezers capable of only suspending) is broken through, a floating ball is driven to ascend and descend at 20kHz, cell interlayer positioning is completed, and the operation is simple and convenient. The 60 kHz trigger push teeth and the straight tooth grooves are in contact meshing through acoustic radiation force, so that the rotating shaft rotates, and the micro cutting tool bit is controlled.

The invention discloses a sandwich type piezoelectric driving double-shaft output mobile robot and a working method thereof.The sandwich type piezoelectric driving double-shaft output mobile robot comprises a sandwich type piezoelectric transducer, a pre-pressure applying mechanism, a driving wheel unit, a first output shaft, a second output shaft, a base body frame and a connecting plate, and a clamping mechanism is not arranged on a stator base body of the sandwich type piezoelectric transducer; a single pin of the pre-pressure applying mechanism and a through hole in the middle of a stator node beam are used for restraining, automatic rolling transmission of contact force is achieved under the condition of matching of the pin hole, and pre-pressure transmitted by the pre-pressure applying mechanism achieves force balance under the counter-acting force generated when a first driving foot and a second driving foot of the sandwich type piezoelectric transducer make contact with the curved surface of an output shaft. The elliptical motion trail direction of the stator driving foot can be controlled by controlling the electric signal phase difference of the longitudinal vibration piezoelectric ceramic set and the bending vibration piezoelectric ceramic set, forward and reverse motion of the first output shaft and the second output shaft is achieved through friction contact, and the mobile robot achieves forward, backward and rapid locking motion.

The invention relates to the field of ultrasonic near-field suspension, in particular to a standing-wave ratio adjusting method suitable for annular vibration flat plate traveling waves, and the method comprises the steps: determining the mechanical resonant frequency in a longitudinal vibration mode required by an ultrasonic suspension transmission device; respectively applying two paths of excitation signals with the same mechanical resonant frequency to the transducer 1 # and the transducer 2 #; analyzing the vibration displacement A of each point on the annular vibration flat plate, and calculating the change condition of the vibration displacement A of each point on the annular vibration flat plate along with theta and time t when the mounting angles of the transducer 1 # and the transducer 2 # are theta, so as to obtain the theta value in a pure traveling wave state under a constant condition; and changing the phase difference theta of the two paths of excitation signals, obtaining the phase difference theta of the excitation signals when the amplitudes of all points on the annular vibration flat plate are equal, solving the actual installation angles of the current transducer 1 # and the transducer 2 # according to the mathematical relationship of the theta sum, adjusting the phase difference theta of the two paths of excitation signals, and obtaining the determined standing-wave ratio.

The invention relates to the technical field of underwater acoustic transmitting transducers, and particularly discloses a curved longitudinal vibration type underwater acoustic transmitting transducer based on a 3D printing technology and a preparation method thereof, the curved longitudinal vibration type underwater acoustic transmitting transducer comprises a metal shell, a plurality of groups of rigid foam plastic, a plurality of groups of piezoelectric ceramic wafer piles, a plurality of prestressed bolts, a metal mass block and a transmitting end with a cavity, each group of piezoelectric ceramic wafer stack is composed of forward polarization piezoelectric ceramics and negative polarization piezoelectric ceramics, the polarization directions of the forward polarization piezoelectric ceramics and the negative polarization piezoelectric ceramics are opposite, and brass gaskets are arranged in the middle and on the two sides of each group of piezoelectric ceramic wafer stack respectively and used for leading out electrodes; according to the underwater acoustic transmitting transducer, the transmitting end is manufactured through the 3D printing technology, the integrality is high, the influence of secondary assembly on work of the underwater acoustic transmitting transducer is reduced, and good work stability of the underwater acoustic transmitting transducer can be guaranteed.

The application relates to a two-dimensional adjustable ultrasonic vibration auxiliary cutting device which comprises a vibration flat plate, a supporting base, four supporting columns, a stepped horn a, a stepped horn b, a longitudinal vibration piezoelectric transducer a and a longitudinal vibration piezoelectric transducer b. The vibration flat plate is of a stepped structure. The four supporting columns are vertically arranged, the upper ends of the four supporting columns are fixedly connected with the four corners of the vibration flat plate respectively, and the lower ends of the four supporting columns are fixedly connected with the supporting base simultaneously. The stepped horn a and the stepped horn b are horizontally arranged. The small end of the stepped horn a is fixedly connected with the center position of the left side surface of the vibration flat plate perpendicularly, and the large end is fixedly connected with the longitudinal vibration piezoelectric transducer a. The small end of the stepped horn b is fixedly connected with the center position of the back side surface of the vibration flat plate perpendicularly, and the large end is fixedly connected with the longitudinal vibration piezoelectric transducer b. The device has the characteristics of simple structure, less energy dissipation and good machining stability, and can realize efficient and low-damage milling and pin machining.

The utility model discloses a kind of car sunroof guide rails with buffering noise reduction structure, it is related to sunroof guide rail field, this kind of car sunroof guide rail with buffering noise reduction structure includes the guide rail main body extending along first direction, outwardly extending mounting plate is formed on the guide rail main body one side outer wall, multiple mounting holes are opened on mounting plate, for bolt connection frame, bolt is passed in mounting hole when connecting;This kind of car sunroof guide rail with buffering noise reduction structure forms three-dimensional grid structure by buffer groove and extension groove, main rubber pad absorbs vertical impact, extension rubber pad inhibits longitudinal vibration, double elastic deformation greatly reduces the area of mounting plate contact part after installation with frame, blocks vibration transmission path, rubber ring in the protruding part groove isolates bolt and mounting plate metal contact, eliminates high-frequency friction abnormal sound.