12 results about "Shear mode" patented technology

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.

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.

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 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.

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.

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.

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.

The application relates to an automatic shearing device for an angle iron continuous processing production line, and belongs to the technical field of profile processing. The device comprises a body frame, an inverted V-shaped profile guide rail arranged at the top of the body frame, a feeding trolley slidably connected to the top of the body frame and used for pushing the angle iron, a plurality of groups of pressing members fixed to the top of the body frame, each group of the pressing members comprising two pressing rollers arranged in an eight-shaped mode and used for limiting the angle iron in cooperation with the profile guide rail, and a shearing mechanism fixed to one side of the body frame and comprising an upper cutting tool, a lower cutting tool and a driving motor II, wherein the driving motor II is used for driving the upper cutting tool and the lower cutting tool to approach each other so as to implement the butt shearing of the angle iron. Through the cooperation of the inverted V-shaped guide rail and the eight-shaped pressing roller, the accurate guidance and stable pressing of the angle iron are realized, and through the butt shearing mode of the upper and lower cutting tools, the shearing vibration and burrs are obviously reduced, and the shearing precision and the finished product quality are improved.