217 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 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 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 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 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 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.

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 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.

The application relates to a composite vibration ultrasonic welding head and a manufacturing method thereof, and belongs to the field of welding. The composite vibration ultrasonic welding head comprises a composite vibration rod, wherein a first type of inclined groove and a second type of inclined groove are arranged on the outer circumferential side surface of the composite vibration rod, the first type of inclined groove and the second type of inclined groove are arranged obliquely relative to the axis of the composite vibration rod and have opposite oblique directions. In the excited state of the composite vibration ultrasonic welding head, the length of the composite vibration rod is an integer multiple of the longitudinal vibration half wavelength and an integer multiple of the torsional vibration full wavelength, and the difference between the longitudinal vibration frequency and the torsional vibration frequency is 2%-7% of the longitudinal vibration frequency. In the welding process, the composite vibration ultrasonic welding head can effectively realize the coupling of longitudinal vibration and torsional vibration, and the service life of the welding head is improved.

The invention provides an ultrasonic transducer and ultrasonic cleaning equipment, the ultrasonic transducer comprises a piezoelectric exciter and a vibration radiant panel, the vibration radiant panel is fixed on the piezoelectric exciter, a power supply is electrically connected with the piezoelectric exciter, so that the piezoelectric exciter can generate longitudinal vibration, and the longitudinal vibration of the piezoelectric exciter can excite bending vibration of the vibration radiant panel. The longitudinal vibration sandwich type piezoelectric ultrasonic transducer solves the defects that an existing longitudinal vibration sandwich type piezoelectric ultrasonic transducer is small in radiation area, weak in longitudinal displacement amplitude, long in longitudinal size and the like to a great extent, and has the advantages of being small in space needed by operation, large in sound radiation area and sound radiation power, small in size and the like. The ultrasonic transducer can be widely applied to the application requirements of miniaturization and thinning of the installation space of the ultrasonic transducer. Meanwhile, the longitudinal bending displacement amplitude conversion ratio of the ultrasonic transducer can be influenced by the length, and / or the width and / or the thickness of the vibration radiant panel, so that the longitudinal bending displacement amplitude conversion ratio of the ultrasonic transducer is further improved through the size of the vibration radiant panel.

Disclosed is an ultrasonic composite vibration converter capable of more efficiently converting vibration energy generated from a transducer having an ultrasonic vibrator into ultrasonic composite vibration in a booster. The ultrasonic complex vibration converter of the present invention comprises: a booster; a ring coupled to the circumference of the booster at an inclined angle from a vertical tangential direction; and a transducer coupled to the ring. Longitudinal vibration generated by the transducer is converted into a rotational and longitudinal vibration force through the booster.

The invention relates to the technical field of ultrasonic knife equipment, in particular to a method for detecting and determining a rubber coating point of a waveguide rod, and aims to solve the problem that the method for detecting and determining the rubber coating point of the waveguide rod is poor in effect. According to the technical scheme, the method comprises the following steps: obtaining an initial simulation waveguide rod structure diagram, and extracting a displacement diagram of longitudinal vibration of the initial simulation waveguide rod to obtain an initial '0' point location diagram; carrying out processing heat treatment according to the initial simulation waveguide rod structure diagram to obtain a bare waveguide rod, and testing static data of the bare waveguide rod, including a bare waveguide rod impedance value R; and taking the impedance value R as a reference value, testing a dynamic real-time impedance value R0 when the bare waveguide rod vibrates under the working frequency, if R-R0 is less than or equal to a preset value, making the bare waveguide rod by using the initial simulation waveguide rod structure diagram to continue testing, and testing dynamic test data of the bare waveguide rod by using the movement of the interference assembly part instead of positioning encapsulation. The theoretical deviation of pure acoustic simulation is reduced, and the cost of repeated mold opening verification is reduced.

The utility model discloses an automobile seat cushion spring assembly, and relates to the technical field of automobile seats, the automobile seat cushion spring assembly comprises four serpentine spring single bodies, the four serpentine spring single bodies are arranged side by side at equal intervals, an L-shaped cross beam is arranged between one ends of the four serpentine spring single bodies, and the other ends of the four serpentine spring single bodies are connected with the serpentine spring single bodies. L-shaped cross beams are arranged between the other ends of the four serpentine spring single bodies and connected with the serpentine spring single bodies in a plastic coating mode, rectangular cross beams are arranged between the other ends of the four serpentine spring single bodies and connected with the serpentine spring single bodies in a plastic coating mode, an elastic connecting plate is arranged between every two adjacent serpentine spring single bodies, and the two ends of each elastic connecting plate are connected with the serpentine spring single bodies in a plastic coating mode. According to the automobile seat cushion spring assembly, the elastic connecting plates are installed between every two adjacent serpentine spring single bodies, vibration generated in the longitudinal direction can be buffered through the elastic connecting plates, the longitudinal tensile property is improved, and the using effect of the spring assembly is improved.

The invention discloses a vibration suppression and energy efficiency improvement method for a marine propulsion system, and belongs to the technical field of ship vibration control and energy efficiency optimizing.The method comprises the steps that vibration signals at a middle bearing, a propeller hub and a main engine base are collected, and three paths of filtering signals are obtained through band-pass filtering; front and rear flow velocity signals and main shaft rotating speed signals of a propeller are collected, and the ratio of the flow velocity difference to the rotating speed difference is calculated to obtain an energy efficiency coefficient; the three paths of filtering signals are multiplied by the energy efficiency coefficient to generate three paths of control signals, and the three paths of control signals are output to the three piezoelectric actuators to generate displacement amounts which act on a bearing shell, the inner wall of a propeller hub and a main engine base; when the propulsion shafting vibrates longitudinally, the metal push rod drives the coil to reciprocate between the permanent magnets to generate induced current, the induced current is stored in the storage battery after being rectified and supplied to the hydraulic controller to adjust the oil flow of the hydraulic cylinder according to a control signal, and graded suppression of multi-source vibration and recycling of vibration energy are achieved. And the vibration suppression effect and the energy efficiency level of the system are obviously improved.

The invention discloses a radial ultrasonic vibration grinding wheel suitable for high-speed grinding and a using method. The grinding wheel comprises a grinding wheel resonance outer ring, a non-contact electric energy transmission device, an ultrasonic transducer, a grinding wheel front cover plate, a grinding wheel rear cover plate and a grinding material layer. Ultrasonic transducers in a longitudinal vibration mode are uniformly mounted on the inner circumferential surface of the resonant outer ring, and power is supplied to the transducers in a non-contact manner, so that the resonant outer ring generates radial ultrasonic vibration in an expansion vibration mode. The abrasive material layer is made of cubic boron nitride or diamond abrasive particles and is fixed to the outer circumferential face through brazing or electroplating, and efficient cutting of a workpiece is achieved. And the grinding force can be effectively reduced and the machining efficiency and the surface quality can be improved by cooperating with rotation and feeding movement of a machine tool spindle. Test results show that the method is suitable for precise grinding of hard and brittle materials and difficult-to-machine materials under the conditions of high speed and large cutting depth.

The invention provides a multi-dimensional vibration platform with oppositely-arranged double-sandwich piezoelectric actuators and an excitation method of the multi-dimensional vibration platform, and belongs to the technical field of high-frequency vibration engineering and micro-nano machining.The vibration platform comprises a center platform, the two oppositely-arranged piezoelectric actuators, two end covers and two bolts, wherein the center platform is integrated with the tail end platform, the two flexible hinges and the two amplitude-change poles, and the center platform is slender and is in mirror symmetry about the longitudinal symmetry plane of the tail end platform. The piezoelectric actuator comprises a longitudinal vibration ceramic group, a bending vibration ceramic group around the Y axis and a bending vibration ceramic group around the Z axis, translation along the X / Y / Z axis and rotation around the Y / Z axis can be realized through in-phase or anti-phase excitation different combinations under the condition of not increasing extra driving channels, and five-degree-of-freedom high-frequency micro-vibration output can be achieved at most. The structure has high symmetry, low parasitic vibration, compact size and high integration, and is suitable for precise engineering scenes such as micro-nano processing, laser-assisted manufacturing, cell manipulation and active vibration suppression.

The invention relates to the technical field of medical instruments, in particular to a piezoelectric driving miniature optical probe for cerebrovascular interventional imaging, which comprises a glass tube base body, a single piezoelectric ceramic piece and the like, and is characterized in that the glass tube base body is of a hollow cylindrical structure, and an inclined groove is formed in the axial center of the glass tube base body; the single piezoelectric ceramic piece is fixed on the outer side of the glass tube base body. Through a hollow rod type stator structure composed of a single piezoelectric ceramic piece and a glass tube base body with a 10-degree inclined groove, mode conversion from longitudinal vibration to longitudinal-torsional coupling vibration is achieved, an elliptical motion track is formed at the position of a miniature magnetic ring at the front end of the stator, 360-degree optical scanning is achieved through friction driving of a rotor, and the mechanical property of the motor is improved. Compared with a traditional far-end miniature probe with the diameter usually larger than 1.5 mm, the whole outer diameter of the probe is reduced to 0.4 mm, and smooth navigation and passing in tortuous and narrow brain middle artery (the diameter is usually smaller than 0.5 mm) are easier.

The utility model discloses an anti-vibration electronic compass structure, which comprises an electronic compass main body and four groups of damping components respectively arranged at four corners of the electronic compass main body, mounting holes are arranged at the four corners of the electronic compass main body, and each group of damping component comprises an outer sleeve arranged in the corresponding mounting hole. A mounting sleeve is coaxially arranged in the outer sleeve, the outer wall of the mounting sleeve is connected with the inner wall of the outer sleeve through a plurality of transverse elastic pieces, the two ends of the mounting sleeve are connected with the electronic compass main body through longitudinal elastic pieces respectively, and transverse vibration and longitudinal vibration of equipment during working can be absorbed through the transverse elastic pieces and the longitudinal elastic pieces; the vibration reduction effect is good, parts on the electronic compass main body are prevented from being damaged due to vibration, and the service life of the electronic compass is prolonged.

The invention discloses a magnetostrictive ultrasonic longitudinal-bending dual-mode cutting device and an operation method, the longitudinal-bending dual-mode cutting device is provided with a longitudinal-bending dual-mode main body, the front end of the longitudinal-bending dual-mode main body is provided with a stepped-shaft-shaped tool apron, chamfers or fillets are arranged between steps, the front end of the stepped-shaft-shaped tool apron is provided with a tool mounting part, and the front end of the stepped-shaft-shaped tool apron is provided with a tool holder; a threaded connection hole is formed in the cutter mounting head part, and the cutter is matched with the threaded connection hole and is fixed on the cutter mounting head part through a cutter fixing bolt. Free switching between the longitudinal vibration mode and the bending vibration mode of the machining device can be achieved by adjusting the direct current of the bias coil at the bias coil rack according to the working condition and the machining requirement of a workpiece, and the precision of the machined surface and the flexibility of a machining tool are improved.

The utility model relates to a novel ultrasonic elliptical vibration coupling mechanical rubber tapping system which is suitable for high-precision low-damage harvesting operation of natural rubber trees. Through cooperative work of the ultrasonic power source, the ultrasonic transducer, the ultrasonic amplitude-change pole, the tool holder and the rubber tapping system base, controllable elliptical vibration of the rubber tapping knife is achieved, and the defects in the prior art are effectively overcome. The system adopts a full-bridge structure high-frequency inverter circuit with an auxiliary network, so that the switching loss is reduced, and the power conversion efficiency is improved; the bimodal composite vibration type ultrasonic transducer generates elliptical vibration through the transverse vibration set and the longitudinal vibration set, and the cutting effect is improved. The exponential ultrasonic amplitude-change pole amplifies a vibration signal, and the cutting strength and efficiency are enhanced; the rubber tapping system base ensures stable connection between the system and the robot; and the cutter clamping seat adopts a clamping type positioning groove, so that the blade is convenient to replace. The rubber tapping device has the advantages of being efficient, accurate and low in abrasion, and the quality and efficiency of rubber tapping operation are remarkably improved.

In certain embodiments, a surgical handpiece system includes a phacoemulsification tip, a fluid management system, an ultrasound drive system, and a controller. The phacoemulsification tip is attached to the 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 a voltage and a current applied to the ultrasonic drive system using fast Fourier transform (FFT), and tune an application frequency of the torsional vibration and the longitudinal vibration according to at least one resonant frequency.

This invention relates to the field of material surface performance testing, and discloses a multifunctional ultrasonic longitudinal vibration friction and wear testing machine with adjustable frequency and amplitude. The machine includes a housing, an oil reservoir, a quick-change tool head, a clamp, a drive system, a tunable ultrasonic longitudinal vibration system, and an oil supply system. The oil reservoir is installed inside the housing. The clamp is located inside the oil reservoir, below the quick-change tool head. The drive system is installed inside the housing and is connected to both the quick-change tool head and the clamp, driving the quick-change tool head to contact the sample on the clamp, and driving the clamp to rotate or reciprocate relative to the quick-change tool head. The tunable ultrasonic longitudinal vibration system is connected to the quick-change tool head, driving the quick-change tool head to vibrate and adjusting its vibration frequency and amplitude. The oil supply system is located on the oil reservoir and supplies oil to the contact area between the sample and the quick-change tool head, adjusting the oil supply volume and temperature. This invention solves the problem of improving the diversity and flexibility of testing.

The embodiment of the present application relates to a kind of dual-frequency high-power liquid processing ultrasonic transducer, comprising: one end of amplitude transformer is connected with sandwich transducer to form longitudinal displacement output structure;Metallic pipe is provided with mounting hole in side surface, mounting hole is connected with amplitude transformer by connecting piece arranged in the conical end of amplitude transformer, both ends of metallic pipe are provided with concave flexure shell;The half-wave mode and full-wave mode of longitudinal displacement output structure make the radial vibration and axial vibration of metallic pipe, form the complex frequency operating mode of ultrasonic transducer.The embodiment of the present application excites the radial vibration and longitudinal vibration of metallic pipe by the half-wave and full-wave mode of longitudinal displacement output structure respectively, realizes the dual-frequency operating mode of ultrasonic transducer;Concave flexure shell amplifies the radial vibration displacement of metallic pipe in phase, increases the acoustic radiation area of metallic pipe axial vibration, improves the acoustic radiation power of ultrasonic transducer and the uniformity of transducer radiation sound field.

The invention provides a bridge longitudinal damping device, and belongs to the technical field of bridge damping. Comprising a connecting assembly, the connecting assembly comprises first connecting plates arranged on the outer side of a damping plate, rotating blocks are rotationally arranged on the inner sides of the first connecting plates, connecting damping rods are arranged on the other sides, away from the first connecting plates, of the rotating blocks, and the tops and the bottoms of the connecting damping rods are sleeved with fixing lantern rings; a damping damper is rotatably arranged on one side of the fixing lantern ring, adjusting blocks are arranged on the two sides of the damping damper, and the damping damper is rotatably connected with the first guide rod through the adjusting blocks. In the connecting assembly of the bridge longitudinal damping device, the first connecting plate is arranged on the outer side of the damping plate to provide a mounting base body for the assembly; the rotating block rotationally arranged on the inner side is used for flexibly transmitting longitudinal vibration of the bridge, the connecting damping rod on the other side of the rotating block can primarily attenuate vibration energy, the fixing lantern rings arranged on the top and the bottom of the connecting damping rod in a sleeving mode provide hinge supporting points for shock absorption damping, and damage to the bridge structure is effectively reduced.

The invention relates to a longitudinal-torsion combined robust ultrasonic cutter handle for a large-diameter cutter and a design method of the longitudinal-torsion combined robust ultrasonic cutter handle. The ultrasonic scalpel comprises a scalpel handle and a transducer arranged in the scalpel handle. The transducer comprises an amplitude-change pole, a piezoelectric ceramic piece, a positive electrode, a negative electrode and a rear cover; the piezoelectric ceramic pieces are arranged between the rear end of the amplitude-change pole and the rear cover in the axial direction in a stacked mode. The negative electrodes and the positive electrodes are clamped between every two adjacent piezoelectric ceramic pieces in a staggered mode, between the rear end of the amplitude-change pole and the piezoelectric ceramic pieces and between the rear cover and the piezoelectric ceramic pieces. The rear cover is used for providing inertial mass; the amplitude-change pole is of a double-taper structure which contracts firstly and then releases, and a transition section is formed between the two tapers. A spiral groove is formed in the axial direction of the amplitude-change pole; the knife handle is provided with a contact conductive contact, the contact conductive contact and the knife handle are arranged in an electric insulation mode, and the contact conductive contact is electrically connected with the positive electrode and the negative electrode through wires. The tool can have the vibration modes of longitudinal vibration and torsional vibration at the same time, and the machining effect and efficiency are improved.

The present invention discloses an active vibration reduction device for a high-speed precision seed meter based on a Watt's linkage. The seed meter and a high-precision posture sensor are mounted on a housing. A first side column and a second side column are respectively fixed to the ends of a top beam. The first and second long-rod mounting points of the first and second Watt's linkage groups are connected to the first side column bearing of the frame, and the first and second long-rod mounting points of the first and second Watt's linkage groups are connected to the second side column bearing of the frame. The first and second fulcrums of the first and second Watt's linkage groups are hinged to the Watt's linkage fixing holes on the housing. The upper and lower ends of the first and second cylinders are respectively fixed to the frame and the housing, and the lower ends of the first and second cylinders are respectively fixedly connected to the first and second sides of the housing. The present invention adopts a Watt's linkage structure, which can effectively prevent lateral deviation of the seed meter and keep the longitudinal vibration amplitude within a small range.