32 results about "Shear mode" patented technology

The invention discloses a closed double-layer stirring type photobioreactor, and relates to the technical field of microalgae culture. A double-layer special-shaped paddle combination is formed through the composite design of a four-straight-blade overall open turbine type (SK) and a three-blade left-handed push type spiral stirring paddle (TXL), paddle combination optimization is formed through the cooperative flow field design of the TXL paddle (lower layer) and the SK paddle (upper layer), axial-radial flow coupling is achieved, and the material exchange rate between gas and liquid is increased; according to the combined design of the double-layer special-shaped paddles, the proportion of a high-shear area is reduced to be lower than 12% through a wide-area low-strength shear mode of the TXL paddles, the shear stress is greatly reduced, and the problem that the shear stress is too high is solved; a dynamic rotating speed strategy is convenient to implement, and the mass transfer efficiency and the cell activity are both considered by adjusting the rotating speed in stages.

The invention relates to the technical field of underground engineering, and discloses a construction safety assessment method, system, equipment and medium for a shield tunnel, and the method comprises the steps: quantifying a construction load and a foundation coefficient in a current construction step, inputting the quantified construction load and foundation coefficient into a nonlinear mechanical solving framework composed of a longitudinal multi-ring model and a single-ring variable model, and carrying out the processing. The longitudinal deformation quantity of each beam unit is obtained, when the longitudinal deformation quantity does not meet the preset requirement, the quantification process of the longitudinal deformation quantity is repeatedly executed until the preset requirement is met, and the bending and shearing modes of each beam unit are determined according to the single ring deformation model so as to evaluate the safety state of the current construction step; the current construction step is updated to iteratively execute the evaluation process of the safety state in the updated current construction step until all construction steps are completed, and a safety evaluation result of the shield tunnel under the action of the construction load is obtained; and the nonlinear deformation response in the longitudinal direction of the shield tunnel is accurately solved, and comprehensive and accurate safety evaluation of the shield tunnel is realized.

The invention discloses an intermediate billet shearing method, device and equipment and a storage medium, and belongs to the technical field of hot continuous rolling control, the method comprises the steps that in response to a starting instruction of an automatic shearing mode of a current intermediate billet, current process parameters and a preset mapping relation of the current intermediate billet are obtained; wherein the preset mapping relation is used for representing the corresponding relation between the historical process parameters of the historical intermediate billet and the optimal historical shear compensation value; searching an optimal historical shearing compensation value corresponding to a historical process parameter which is the same as the current process parameter in the preset mapping relation; adjusting a preset shearing position according to the searched optimal historical shearing compensation value; and the current intermediate billet is sheared according to the adjusted shearing position. According to the method, the preset shearing position is dynamically adjusted by combining the technological parameters of the intermediate billet and the optimal historical shearing compensation value, the accuracy of the shearing position of the intermediate billet is improved, and the yield is increased while the rolling stability is guaranteed.

The invention provides a broadband wide-amplitude vibration isolation device, and belongs to the technical field of vibration isolation devices. According to the invention, the mechanical characteristics of the magnetorheological fluid working in a flow mode, an extrusion mode and a shear mode are fully utilized, the same coil is adopted to regulate and control the magnetic field intensities of different areas, and the shear yield stress of the magnetorheological fluid is regulated by utilizing the change of the magnetic field, so that the magnitude of output damping is changed. The requirement for controllable damping under the low-frequency large-amplitude working condition and the high-frequency small-amplitude working condition can be met, and the adaptability to different working conditions is effectively improved.

Provided is an acoustic resonator in a transverse excitation shear mode. The acoustic resonator comprises: an acoustic mirror (120), which comprises at least one first acoustic reflecting layer (121, 123, 125) and at least one second acoustic reflecting layer (122, 124), wherein the acoustic impedance of each first acoustic reflecting layer is less than that of each second acoustic reflecting layer; a piezoelectric layer (130), which is arranged on the acoustic mirror, and which comprises lithium niobate of a single crystal material and / or lithium tantalate of a single crystal material; electrode units (142, 143, 144), which are arranged on the piezoelectric layer (130) and are used for forming an electric field; and transverse reflectors (152, 154), which are arranged on the piezoelectric layer, are used for transversely reflecting acoustic waves, and can have a high electromechanical coupling coefficient and a high Q value at a frequency greater than 3 GHz.

The utility model relates to metal sheet processing equipment field, concretely is a kind of wire harness automatic connecting device based on uncoiling line swing shear die. Including swing shear die, height adjusting mechanism, support no.

The invention relates to the technical field of asphalt preparation, in particular to modified asphalt preparation equipment and method.The preparation method comprises the following steps that S1, matrix asphalt is pretreated; s2, premixing a composite modifier; s3, carrying out gradient high-speed shearing; s4, carrying out anti-aging modification; the distributed high-speed shearing equipment in the step S3 comprises an equipment body, a machine body shell, a fixed rotating blade, a movable rotating blade and a plurality of flow deflectors, the fixed rotating blade is fixed to a shearing shaft, and the movable rotating blade is arranged in a sliding mode in the axial direction of the shearing shaft; the multiple flow deflectors are arranged around the outer ring of the bottom of the shearing shaft; according to the preparation method, the dispersion uniformity of the modified asphalt is remarkably improved, the anti-aging performance is greatly optimized, a conventional shearing mode of a single rotating speed is broken through, a gradient process of rough shearing and fine shearing is adopted, large particles are crushed in the rough shearing process, multiple added raw materials are effectively mixed, and fine dispersion is performed in the fine shearing process, so that the production efficiency is remarkable, and the production cost is reduced.

According to the microinjection device and the microinjection control method, the problems that in microinjection membrane breaking operation, a membrane structure is high in deformation damage, solid particle injection is not facilitated, and the membrane breaking efficiency is low are solved, and the microinjection device and the microinjection control method belong to the technical field of microoperation and microinjection. The microinjection device comprises a linear motion module, a rotating module and a microneedle, the linear motion module is used for driving the microneedle to do linear motion, the rotating module is used for driving the microneedle to do rotating motion, and a driving signal of the rotating module is a periodic alternating rotating signal. A periodic alternating rotary shearing mode is adopted to replace a traditional one-way rotation or fixed vibration mode, the deformation process of the membrane is homogenized through dynamic shearing force, the deformation quantity of the membrane is reduced, the cell activity is remarkably improved, membrane penetration is accelerated through the shearing fatigue effect and the crack expansion effect generated by alternating rotation, and the cell quality is improved. And the membrane breaking efficiency is further improved compared with one-way rotation.

Piezoelectric materials are utilized in shear mode deformation to excite longitudinal flexural bending electromechanical motion in a transducer. A single transducer stack comprising a plurality of shear mode piezoelectric material elements are arranged to create a flexural bender bar which can be used for electroacoustic applications. The transducer stack is configured such that adjacent piezoelectric elements have opposite shear mode deformation. Electrodes for positive and negative voltage excitation are applied to parallel faces of the piezoelectric elements. Application of a voltage difference between the electrodes causes the piezoelectric elements to undergo shear strain, wherein one half of the transducer stack expands into tension and the other half contracts into compression, thus inducing longitudinal flexural bending electromechanical motion. Enclosed embodiments provide support structures for utilization of piezoelectric shear mode induced longitudinal flexural bending electromechanical motion.

The invention discloses a hydraulic gantry shear with an adjustable cutting edge and a using method, and relates to the field of steel shearing equipment, and the hydraulic gantry shear comprises a table body, a brake cutting module, a supporting module, a pressing block, a conveying module and a reduction gearbox. A hydraulic cylinder is assembled on the gantry structure of the table body to drive the brake-cutting module and the pressing block to move; the brake cutting module is provided with an external knife switch, an internal knife switch and a lifting knife switch, and the lifting knife switch can adjust the cutting edge form of the internal knife switch; the supporting module comprises a fixed supporting table and a lifting supporting table capable of lifting, and can adapt to different knife switch forms. According to the equipment, strip-shaped and plate-shaped steel shearing can be completed without disassembling and assembling parts by switching the cutting edge state of the brake blade and the structure of the supporting table, the plate-shaped steel adopts a segmented tooth-shaped shearing mode, the shearing efficiency is improved, and the operation cost is reduced.

There is provided a droplet generator comprising: a conduit comprising an orifice configured to be fluidly coupled to a reservoir and to emit a molten target material in a direction of the molten target material; a plurality of piezoelectric elements at least partially surrounding the conduit, characterized in that at least one of the piezoelectric elements is configured to operate in a shear mode such that a shear movement of the at least one piezoelectric element is performed in the direction of the molten target material.

A fracture toughness testing machine evaluates fracture toughness of a specimen in pure mode. The testing machine includes: a testing-load applying device for applying a predetermined testing load to the specimen, in which the stresses are present; and a cancelling-load applying device for applying a cancelling load to the specimen to cancel the stresses therein. The cancelling-load applying device includes: a pressing-force applying portion that applies a pressing force to the specimen as the canceling load; and a pressing-force determining portion that determines magnitude of the force. The pressing-force determining portion calculates the magnitude of the force using pre-stored equations so that an energy release rate related to in-plane shear mode crack deformation becomes zero.

The utility model discloses an isolation shear type piezoelectric acceleration sensor, which belongs to the technical field of sensors and comprises a shell and a cover plate, a magnet is fixedly mounted on the side wall of the cover plate, and a splicing assembly is arranged on the inner wall of the shell. According to the utility model, through the arrangement of the splicing assembly, as one end of the limiting rod and one end of the clamping rod are inclined, as one end of the limiting rod extrudes the clamping rod, after one end of the clamping rod is aligned with the clamping port, the clamping rod is inserted into the clamping port under the action of the fixing spring, so that the cover plate and the shell are spliced together; when the sensor needs to be disassembled, the shifting block drives the connecting rod to move in the stroke groove, so that the sliding block moves, the sliding block drives the clamping rod to move downwards and be separated from the clamping opening of the limiting rod, then the cover plate and the shell are separated, the installation structure and steps of the sensor are simplified, disassembly and assembly of the sensor are improved, and then the production efficiency of the sensor is improved.

The application discloses a soil strength testing vane shear test device in the technical field of geotechnical engineering, which comprises a power assembly, a second transmission shaft, a first transmission shaft and a screw rod arranged in sequence according to the transmission sequence, and a screw rod connector for fixedly connecting a test structure is arranged at the lower end of the screw rod; the vane shear test device has two working modes of up-down movement mode and rotary shear mode; when the third transmission assembly rotates following the second transmission shaft, the second transmission assembly fixes the first transmission shaft, and the screw rod constraint assembly restricts the rotation of the screw rod, the screw rod drives the test mechanism to move upwards or downwards; when the first transmission assembly rotates following the first transmission shaft, the fourth transmission assembly rotates following the second transmission shaft, and the screw rod constraint assembly releases the screw rod, the screw rod drives the test mechanism to rotate and shear.

The invention belongs to the technical field of physical and chemical testing, and relates to a high-brittleness random fiber network thermal protection material shear experiment device and method.The method comprises the steps that firstly, after a sample is wrapped with an isolation pad, the sample is placed in a fixed clamp assembly and a sliding clamp assembly, and an initial gap between the fixed clamp assembly and the sliding clamp assembly is accurately set through a gap gasket; then, the load applying end of the testing machine control box pushes the sliding clamp assembly to generate displacement, shear load is applied to the sample, and the whole process is monitored in real time by the computer terminal and shear force and displacement data are recorded. Stress concentration generated during clamping of the clamp is effectively buffered through the isolation pad, and a sample is prevented from being damaged in advance in a non-shearing area; the clearance gasket is matched with the relative movement of the fixed / sliding clamp assembly, so that the load is ensured to act on the sample in a pure shearing form; the modularized clamp design is compatible with different sample shapes and shearing modes, so that the universality of the method and the accuracy and reliability of a test result are remarkably improved.

The invention relates to the technical field of walnut shell breaking, and discloses a walnut extruding, shearing and shell breaking device. Comprising a driving mechanism, the driving mechanism comprises a workbench, a moving assembly and limiting assemblies, the moving assembly is installed on the workbench, the two limiting assemblies are installed on the moving assembly in a bilateral symmetry mode, and the shell breaking mechanism is installed on the driving mechanism; through the extrusion assembly and the shearing assembly, a pressure sensor arranged in the extrusion assembly can monitor the elastic force of a shell breaking spring in real time, the extrusion force is automatically adjusted according to the hardness of walnuts, when the pressure exceeds a threshold value, an air cylinder of the limiting assembly triggers force unloading, the situation that kernels are broken due to excessive extrusion is avoided, and dual-mode shell breaking linkage is achieved; and if extrusion shell breaking is not successful, the device is automatically switched to a shearing mode, accurate shearing is carried out through an electric lifting rod and a cutting knife of the shearing assembly, double shell breaking of extrusion and shearing is achieved, and the shell breaking success rate is increased.

The present invention relates to the technical field of road performance testing. Disclosed are a performance testing method for an asphalt pavement layer, and a shearing fixture. The method comprises: providing a shear specimen, wherein the shear specimen comprises a cement-stabilized layer, a bonding layer, and an asphalt layer which are stacked; shearing the bonding layer of the shear specimen at a constant rate in a direct shear mode; acquiring test data during the shearing of the bonding layer of the shear specimen, wherein the test data comprises the maximum shear force during the shearing of the bonding layer of the shear specimen, the shear surface diameter of the bonding layer, and the displacement corresponding to the maximum shear force; and calculating the performance of the shear specimen on the basis of the test data. The method realizes more accurate evaluation of the performance of the asphalt pavement bonding layer by performing multiple tests on the shear specimen at different constant rates and with different shear spacings.

The application discloses a kind of without bottom electrode transverse excitation thickness shear type high overtone bulk acoustic wave resonator, including low acoustic loss substrate, piezoelectric film layer being arranged on substrate and the transverse electrode structure being arranged on the top of piezoelectric film layer. Among them, piezoelectric film layer and substrate do not set any metal electrode layer between them, and form continuous acoustic impedance matching interface.Working, through transverse electrode in piezoelectric layer generates plane direction electric field, excite thickness shear vibration mode, make acoustic wave propagate along thickness direction and form multiple reflection high overtone standing wave resonance in substrate.Compared with traditional structure, the application completely eliminates the acoustic impedance mismatch problem introduced by bottom electrode, significantly improves acoustic energy transmission efficiency and quality factor, obtains stable frequency spectrum comb response, simultaneously realizes the flexible regulation of modal volume by electrode design.The structure process is simple, compatible with standard semiconductor process, suitable for radio frequency filter, multiplexer and microwave acoustic system.

The present invention provides the following as a double-sided adhesive sheet that has excellent impact resistance and tends not to leave any marks during bonding.　A double-sided adhesive sheet having an adhesive layer obtained by curing an adhesive composition containing a (meth)acrylic copolymer (A), wherein: a stress-strain curve obtained for a test piece of 20 mm × 70 mm of the adhesive sheet when a tensile test is performed at a tension rate of 300 mm / min and a chuck distance of 20 mm indicates that the tensile elastic modulus (E') at 25°C, which is calculated as the slope of the strain section from 10% to 200%, is 1.0-20 MPa; and the elastic modulus ratio (E' / G') of the tensile elastic modulus (E') at 25°C to the shear storage elastic modulus (G') at 25°C obtained by dynamic viscoelasticity measurement in the shear mode at a frequency of 1 Hz is 15-100.

A shear mode piezoelectric accelerometer includes a ring-shaped piezoelectric element, a central shaft, a mass block, a first electrode, and a second electrode. The ring-shaped piezoelectric element includes an outer ring wall and an inner ring wall. The central shaft is made of conductive material and is fixed through the inner ring wall of the ring-shaped piezoelectric element. The mass block is made of conductive material and includes a fixed element and a weight element. The fixed element has a fixed hole and is fixed to the outer ring wall of the ring-shaped piezoelectric element by fitting the fixed hole. The weight element is located on the fixed element on the opposite side away from the fixed hole. The first electrode is electrically connected to the central shaft. The second electrode is electrically connected to the mass block.

A bulk acoustic resonator device and filter device including the same is provided. The resonator includes a substrate; a piezoelectric layer attached to the substrate; and an interdigital transducer having interleaved fingers on the piezoelectric layer. The interleaved fingers include a first layer proximate the piezoelectric layer, a second layer over the first layer, and a third layer over the second layer such that the second layer is between the first and third layers. Adjacent layers of the first, second and third layers are comprised of different metals. Moreover, a primary shear acoustic mode is excited in the piezoelectric layer and is a bulk shear mode where acoustic energy propagates in a direction predominantly orthogonal to the surface of the piezoelectric layer and predominantly orthogonal to a direction of an electric field created by the interleaved fingers of the IDT that is predominantly lateral in the piezoelectric layer.

The present application relates to a thickness direction excitation shear mode acoustic resonator, comprising: an acoustic mirror, comprising at least one first acoustic reflection layer and at least one second acoustic reflection layer, the acoustic impedance of each first acoustic reflection layer is less than the acoustic impedance of each second acoustic reflection layer; a bottom electrode layer is located on the acoustic mirror; a piezoelectric layer is arranged on the bottom electrode layer, the piezoelectric layer comprises lithium niobate of single crystal material and / or lithium tantalate of single crystal material; an electrode unit is arranged on the piezoelectric layer; a transverse reflector is arranged on the piezoelectric layer, comprising a first reflector located on the first side of the electrode unit and a second reflector located on the second side of the electrode unit, the transverse reflector is used for transverse reflection of acoustic waves; wherein the bottom electrode layer and the electrode unit are used to form an electric field. The present application can have high electromechanical coupling coefficient and high Q value at a frequency of 3GHz or more.

The present invention relates to an acoustic resonator for a transversely excited shear mode, comprising: an acoustic mirror comprising at least one first acoustic reflection layer and at least one second acoustic reflection layer, the acoustic impedance of each first acoustic reflection layer being less than the acoustic impedance of each second acoustic reflection layer; a piezoelectric layer disposed on the acoustic mirror, the piezoelectric layer comprising single-crystalline lithium niobate and / or single-crystalline lithium tantalate; an electrode unit disposed on the piezoelectric layer for forming an electric field; and a transverse reflector disposed on the piezoelectric layer, comprising a first reflector located on a first side of the electrode unit and a second reflector located on a second side of the electrode unit, the first and second sides being opposite sides, the transverse reflector being configured to laterally reflect acoustic waves. The present invention can achieve a high electromechanical coupling coefficient and a high Q value at frequencies above 3 GHz.

An elastic surface wave device includes a piezoelectric layer, first and second interdigitated electrodes embedded in the piezoelectric layer, and a substrate carrying the piezoelectric layer and the electrodes. The substrate satisfies both of the following conditions: an attenuation of an elastic mode having an electrode in the piezoelectric layer is less than 0.1 dB / λ; and a speed ratio between a volumetric elastic shear mode for the substrate and a fundamental elastic shear mode for the piezoelectric layer is smaller than a predetermined speed ratio having a value equal to 1. The substrate is chosen from among gallium arsenide and a glass having a Young's modulus of between 60 GPa and 180 GPa, a Poisson's ratio of between 0.15 and 0.35, and a density of between 2000 kg / m3 and 6000 kg / m3.

This invention relates to the field of underground engineering technology and discloses a method, system, equipment, and medium for construction safety assessment of shield tunnels. The method quantifies the construction load and foundation coefficient in the current construction step and inputs them into a nonlinear mechanical solution framework composed of a longitudinal multi-ring model and a single-ring variable model. This process obtains the longitudinal deformation of each beam element. If the deformation does not meet preset requirements, the quantification process is repeated until the preset requirements are met. The bending and shear modes of each beam element are determined based on the single-ring variable model to assess the safety status of the current construction step. The current construction step is updated, and the assessment process for the safety status of the updated step is iteratively executed until all construction steps are completed, resulting in a safety assessment of the shield tunnel under construction loads. The method accurately solves for the nonlinear deformation response in the longitudinal direction of the shield tunnel and achieves a comprehensive and accurate safety assessment of the shield tunnel.

The utility model discloses a flying shear device capable of rapidly switching shear modes, which comprises a base, a machine body is arranged on the base, a long arm and a shear arm are arranged at the front part of the machine body, a transmission shaft and a speed change mechanism are arranged in the machine body, the rear part of the machine body is connected with a motor through a telescopic coupling, and a first shear blade is arranged at one end of the shear arm. A second shear blade is arranged at one end of the long arm. The shearing machine is novel in structural design, the transmission shaft drives the shearing arm to rotate, the shearing arm can simultaneously drive the long arm to conduct crank rotation, when the shearing arm rotates, a rolled piece is sheared through the first shearing blade, when the long arm conducts crank rotation, the rolled piece is sheared through the second shearing blade, and the rotating speed of the transmission shaft in the machine body is changed through the speed change mechanism. Shearing of small-specification high-speed rolled pieces and large-specification low-speed rolled pieces is achieved, meanwhile, a production line does not need to be stopped, switching can be completed within one minute, convenience and rapidness are achieved, and time and labor are saved.

Acoustic resonator device, comprising: a substrate (120) with a surface; a piezoelectric plate (310, 510) with a front and a back surface, wherein the back surface is attached to the surface of the substrate (120), except for a part of the piezoelectric plate (310, 510) which forms a membrane (115) spanning a cavity (140) in the substrate (120); an interdigital converter, IDT, (130) on the front surface of the piezoelectric plate (310, 510), such that nested fingers (338, 538) of the IDT (130) are arranged on the membrane (115), wherein the piezoelectric plate (310, 510) and the IDT (130) are configured such that a high-frequency signal applied to the IDT (130) excites a primary acoustic shear mode in the membrane (115); and a dielectric layer (350, 550) arranged either on the front surface or on the back surface of the piezoelectric plate (310, 510), where a thickness td of the dielectric layer (350, 550) is defined as: 0.85 λ 0,d ≤ 2 td ≤ 1.15 λ 0,d , and where λ 0,d a wavelength of the fundamental resonance of the acoustic volume shear wave in the dielectric layer (350, 550).

A large-tonnage lifting platform comprises a bottom platform, a corresponding top platform is arranged above the bottom platform, the bottom platform and the top platform are connected through a lifting device with a hydraulic system, and the hydraulic system is further associated with an electric control system. The lifting device comprises an inner lifting arm and an outer lifting arm which are crossed in a shear mode, the outer lifting arm is sleeved on an outer ring of the inner lifting arm, corresponding mandrels are arranged in the middles of the inner lifting arm and the outer lifting arm, the inner lifting arm and the outer lifting arm are rotatably connected together through the mandrels, and the top end of the outer lifting arm and the bottom end of the inner lifting arm are fixed ends of the outer lifting arm and the inner lifting arm. The bottom end of the outer lifting arm and the top end of the inner lifting arm are free ends of the outer lifting arm and the inner lifting arm, and the free ends of the outer lifting arm and the inner lifting arm are slidably connected to the top face of the bottom table and the other side end, opposite to the fixed ends of the outer lifting arm and the inner lifting arm, of the bottom face of the top table respectively. And the hydraulic system is arranged between the outer lifting arm and the inner lifting arm. The utility model has the advantages of simple structure, convenience in operation, larger bearing capacity and better stability.

The application discloses a kind of bar automatic sizing double cold shears system and method, the system includes: first roller way, second roller way, third roller way are sequentially arranged along production line;First cold shear is provided above the junction of first roller way and second roller way;Second cold shear is provided above the junction of second roller way and third roller way;First sizing baffle, second sizing baffle, third sizing baffle are sequentially arranged above third roller way;First roller way is provided with first area sensor;Second roller way is provided with second area sensor;Third roller way is provided with third area sensor;Double cold shear system further includes control unit, for receiving the signal transmitted by first area sensor, second area sensor, third area sensor, and based on the signal, control first sizing baffle, second sizing baffle, third sizing baffle are raised or lowered according to the setting of shearing mode, complete bar automatic sizing, the system is convenient and accurate, greatly improves production capacity.

This utility model discloses a shearing mechanism for a shearing machine, relating to the technical field of shearing machines. It includes a machine base, a feeding platform mounted on one side of the machine base, a lower cutter fixedly connected to the feeding platform, a feeding port on the machine base, a lifting platform disposed within the machine base, an upper cutter mounted at the bottom of the lifting platform, and a drive assembly including a first motor mounted on the machine base. A square slot is provided on the lifting platform. This utility model features a reasonable design structure. The first motor drives a cam to rotate, causing the lifting platform to descend under its own weight, allowing the upper cutter to abut against the shearing position of the sheet metal. Subsequently, the cam protrusion gradually applies pressure to complete the shearing. This progressive shearing mode of "contact first, then pressure" avoids damage to the edge of the sheet metal from instantaneous impact, effectively reducing burrs, deformation, and micro-cracks on the cut surface, significantly improving the cutting quality of the sheet metal. It is particularly suitable for industries with high processing precision requirements, such as aerospace, automotive, and precision machinery.