15results about How to "Low bending stiffness" patented technology

The invention relates to a waterproof anti-cracking composite coiled material and a preparation method and application thereof. The composite coiled material comprises a paper base layer and a waterproof coating coated on the surface of the paper base layer, and the waterproof coating is formed by curing a waterproof finishing agent. The waterproof finishing agent comprises the following raw materials in parts by mass: 60-75 parts of epoxy resin, 2-5 parts of a hardening agent, 5-20 parts of rubber particles, 8-15 parts of modified bacterial cellulose, 20-30 parts of polylactic acid, 10-20 parts of polyethylene glycol and 5-10 parts of a silane coupling agent. The composite coiled material can serve as a decorative material to be attached to the surface of furniture, and due to the good flexibility, crack resistance and tensile effect, the technical problems that when traditional furniture decorative paper is attached, corners are prone to being bent and broken, and the waterproof performance is poor are solved.

The present invention relates to a lightweight, multi-directional, low-frequency, broadband honeycomb sandwich vibration damping structure, which uses a lattice sandwich structure as a matrix, and integrates a local resonance unit in its internal cavity. Through the independent design and regulation of the matrix and the local resonance unit performance, the lightweight and ultra-strong characteristics and the vibration suppression function can be achieved simultaneously. The structure of the present invention includes an upper panel, a lower panel and a vibration isolation functional structure. The vibration isolation functional structure is composed of a honeycomb core layer and a local resonance unit. The main body of the local resonance unit is a three-group spring sheet-mass block resonance system. The modal frequency and direction of the resonance system can be changed by adjusting the installation method of the spring sheet. The structure of the present invention has both lightweight and ultra-strong properties and low-frequency broadband vibration damping performance, and is easy to adjust the vibration damping frequency band and direction. It is suitable for multi-directional, low-frequency broadband and multi-line spectrum vibration control scenarios under lightweight requirements.

The invention relates to the technical field of medical instruments, and discloses a micro catheter. Wherein the microcatheter is sequentially provided with a lining tube and a high polymer material layer from inside to outside in the radial direction, a variable-diameter section is arranged at the far end of the microcatheter, a small-diameter section is arranged on one side of the far end of the variable-diameter section, and a large-diameter section is arranged on one side of the near end of the variable-diameter section; the high polymer material layer comprises a first hardness area, a second hardness area and a third hardness area which are sequentially arranged from the far end to the near end, the first hardness area is located on a part of the small-diameter section, the second hardness area is located on the other part of the small-diameter section, the variable-diameter section and a part of the large-diameter section, and the third hardness area is located on the other part of the large-diameter section; the hardness of the first hardness area is smaller than that of the second hardness area, the hardness of the second hardness area is smaller than that of the third hardness area, and smooth transition of different hardness materials of the large-diameter section and the small-diameter section of the microcatheter is achieved; the flexural rigidity of the reducing section is reduced, so that the change value of the flexural rigidity is reduced, the stress concentration is reduced, and the reliability of the microcatheter is improved.

The application provides a micro catheter, comprising a tube body, the tube body comprising an inner layer, an intermediate layer and an outer layer, the intermediate layer comprising a reinforcing area, a body area and a weakening area arranged in sequence along the circumferential direction of the tube body, the bending stiffness of the reinforcing area, the body area and the weakening area decreasing in sequence. Therefore, the bending stiffness of the tube body on the side of the reinforcing area is stronger, so that the micro catheter has better pushing performance and supportability on the side of the reinforcing area, and the kinking caused by the transitional bending of the micro catheter can be avoided. Meanwhile, the bending stiffness of the tube body on the side of the weakening area is smaller, the local flexibility is higher, and the bending performance is better. The body area maintains the basic stiffness and performance of the tube body and forms a smooth transition between the reinforcing area and the weakening area, so that the local stress concentration does not cause the bending failure of the catheter, thereby realizing the passability of the micro catheter in special tortuous blood vessels and the plasticity of the head end.

The utility model relates to the technical field of medical instruments, and discloses an insertion tube and an endoscope, the endoscope comprises an operation part, and the insertion tube is provided with a first end close to the operation part of the endoscope and a second end far away from the operation part. Specifically, the insertion tube comprises an elastic layer and a coating layer coating the outer side of the elastic layer. Furthermore, the elastic layer is of a tubular structure, and the thickness of the elastic layer is gradually reduced from the first end to the second end. According to the insertion tube and the endoscope, the use reliability is improved, and the production and manufacturing cost is reduced.

The utility model discloses a temporary finger-shaped plate for a straddle type rail transit operation maintenance period, which relates to the technical field of finger-shaped plates, and comprises a first finger-shaped plate and a second finger-shaped plate, the second finger-shaped plate is fixedly installed on the working face, close to the gap, of the adjacent non-maintenance track beam, the first finger-shaped plate is located at the position close to the gap and not stretching out of the gap, and the second finger-shaped plate extends across the gap to the position of the first finger-shaped plate and is attached to the surface of the first finger-shaped plate to form a simple supporting state. And an elastic base plate is fixedly arranged between the bottom of the second finger-shaped plate and the track beam. The second finger-shaped plate can be borne by an anchor bolt on a non-maintenance track beam, the second finger-shaped plate and the first finger-shaped plate can form a simple supporting state, the stress condition is good, and it is guaranteed that the maintained anchor bolt on the maintenance track beam cannot be damaged due to premature pulling force.

This application relates to the field of semiconductor technology, specifically to a MEMS piezoelectric loudspeaker and acoustic device, including a substrate and a piezoelectric stack disposed on the substrate; the piezoelectric stack has multiple tangents extending from the geometric center of the piezoelectric stack to the edge of the piezoelectric stack, forming multiple cantilever beams arranged rotationally symmetrically about the geometric center; each cantilever beam has a fixed edge away from the geometric center; at least two of the cantilever beams have trench structures on the substrate, the trench structures being located close to the fixed edge of the cantilever beam. This application can reduce peaks at resonant frequencies and effectively expand the frequency bandwidth, improving overall audio performance; in addition, this application can also reduce diaphragm stiffness, thereby significantly enhancing its low-frequency deformation capability and optimizing the low-frequency sound pressure level curve.

The present application relates to a flexible display panel and a display device, wherein the flexible display panel includes a display layer and a bending layer, wherein the bending layer includes a plurality of support units, wherein the support units include a first support plate, a second support plate and a third support plate, wherein the first support plate is connected to the second support plate and the third support plate respectively through a connecting member, wherein the second support plate and the third support plate are located in the same plane, wherein the second support plate and the third support plate are arranged on two adjacent sides of the first support plate, wherein the first support plate is located above the second support plate and the third support plate, wherein the angles formed by the first support plate, the second support plate and the third support plate and the connecting member are all obtuse angles, wherein the plurality of support units are parallel to each other and are arranged in the horizontal and vertical directions, wherein in two adjacent support units in the horizontal direction, the first support plate is connected to the adjacent second support plate, and in two adjacent support units in the vertical direction, the first support plate is connected to the adjacent third support plate. The present application helps to improve the bending performance of the display panel.

The application belongs to the technical field of additive manufacturing material preparation, and particularly relates to a preparation device and method of high-fiber-content reinforced polyether ether ketone 3D printing wire rod, which comprises: a material source assembly for providing an impregnated tape; a filament splitter in communication with the material source assembly, which divides the wide impregnated tape into multiple narrow strips through a cutter shaft and a circular disc split cutting knife; multiple multi-nozzle step-by-step pultrusion devices corresponding to the narrow strips, which are provided with multiple nozzles with gradually reduced diameters at the discharge end, and are used for heating, guiding, pressurizing, impregnating and cooling the narrow strips; and a wire collecting reel in communication with each pultrusion device. Through the parallel process of "first dividing and then pulling", the application solves the problems of low forming freedom of the wide pre-impregnated tape, large damage and high cost in traditional wire rod preparation, and realizes efficient and low-damage continuous production of high-performance 3D printing wire rod.

The present application provides a kind of anti-perforation gastroscopes and control method, wherein the device comprises: sensing integrated module, be provided at the front end of endoscope insertion tube, for synchronously obtaining the contact pressure data of mirror body circumferential, the microscopic structure image of mucosa tissue and the kinematic data of mirror body;It transmits the original sensing signal in real time to data processing unit through signal transmission bus;Data processing unit is connected with sensing integrated module, for the received multimodal sensing signal is carried out space-time alignment, extracts mucosa deformation feature and generates real-time risk score fusion;Data processing unit outputs the multi-level execution instruction corresponding to risk score;Active intervention module, it includes the physical response mechanism distributed in the front end of mirror body and the mechanical blocking mechanism in handle end;Active intervention module receives the execution instruction through the logic control interface, and drives corresponding mechanism to adjust the physical rigidity of mirror body or operating resistance of advance mirror;The present application can effectively reduce the risk of perforation.

This invention provides a vacuum composite LNG cryogenic pipeline, comprising four functional layers from the inside out: an inner composite pipeline layer, a vacuum layer, an outer composite pipeline layer, and an outer sheath layer. The inner composite pipeline layer consists of an inner spiral wire layer, a sealing layer, a braided layer, another sealing layer, and an outer spiral wire layer, arranged sequentially from the inside out. The vacuum layer is formed by an annular area between the inner and outer composite pipeline layers, supported by an insulating gasket ring, providing vacuum insulation. The outer composite pipeline layer consists of inner and outer spiral wire layers as its innermost and outermost layers, a sealing layer as its second layer, and a braided layer as its third layer. The outer sheath layer comprises an outer sheath. This invention offers superior bending flexibility and low bending stiffness, making it less prone to fatigue damage under external tensile and bending cyclic loads. It also provides excellent insulation, more rational stress transmission in cryogenic pipelines, and a wider range of applications.

The invention provides a preparation method of an elastic composite material. The preparation method comprises a first supply process S1, a second supply process S2 and an elastic film supply process S3, s4, compounding: compounding an elastic film between the first elongated non-woven fabric and the second elongated non-woven fabric to form an elastic composite material semi-finished product in an elastic non-activated or pre-activated state; a first extension process S51: extending the elastic composite material semi-finished product along the MD direction; a first extension step (S51) in which an MD extension gear roller device is arranged; the MD extension gear roller device at least comprises a first gear roller and a second gear roller. The first gear roller and the second gear roller synchronously rotate in opposite directions in the circumferential direction, the elastic composite material semi-finished product extends in the MD direction, and a through hole is formed in the joint part; a first insertion angle beta is formed by connecting lines of the tooth tips of the first tooth parts and the tooth tips of the two adjacent second tooth parts, and the first insertion angle beta is smaller than 90 degrees. The prepared elastic composite material is smooth in surface, high in air permeability and fluffy and soft in surface.

The invention discloses a control system for adjusting the bending rigidity of a shoe sole. The control system comprises the shoe sole and a controller. The sole comprises a midsole body, a sliding piece and a driving piece. The sliding part is arranged in the insole body and provides rigidity for the insole body, and the driving part drives the sliding part to slide in the insole body in the front-back direction. When the sliding part is located at the half sole part of the insole body, the bending rigidity of the sole is increased, and when the sliding part is not located at the half sole part, the bending rigidity of the sole is reduced. The controller is arranged on the hand and comprises a stretching sensor and a signal generator, the stretching sensor senses stretching or contraction of the hand skin, and the signal generator controls the driving piece to drive the sliding piece to slide forwards or backwards. The control system meets the requirement that the bending rigidity of the shoe sole can be adjusted, and meanwhile the intelligence and individuation of the adjusting mode are improved.

This invention provides a method and application for measuring the surface thermal expansion coefficient of a layered two-dimensional material. The method includes: measuring the flexural stiffness δ of the layered two-dimensional material in a direction perpendicular to the plane, and the thermal expansion coefficient α of the chemical bonds in the layered two-dimensional material. bond Substituting into equation (1), we obtain the surface thermal expansion coefficient α of the layered two-dimensional material. s ;α s =2α bond –50 / δ(1). This invention proposes for the first time that the thermal expansion coefficient of a two-dimensional material can be obtained by combining these two testing schemes and converting them. This measurement method has the advantages of simple operation, transferable test data, wide temperature coverage, and stable results.