214results about How to "Improve stress distribution" patented technology

The invention relates to the technical field of hydraulic engineering operation prediction, in particular to a hydraulic engineering operation trend prediction method and system. The method comprises the following steps: acquiring multi-source hydraulic engineering data, and generating a hydraulic engineering three-dimensional model through multi-source space fusion processing and three-dimensional model simulation; performing geometric complexity identification and stress path analysis on the three-dimensional model to determine key nodes in the water conservancy project; historical water conservancy data are obtained, time sequence conversion and potential mode mining are carried out, and potential modes related to engineering are obtained; performing stress superposition comparison on the key nodes of the water conservancy project and the potential mode to generate stress superposition comparison data, and iteratively adjusting the key nodes according to a result to obtain adjusted stress nodes; constructing a prediction model based on the adjusted stress node and the potential mode, performing operation trend prediction, and generating an operation trend prediction result of the water conservancy project; the high-precision and high-adaptability water conservancy project operation trend prediction method is realized.

The invention relates to the technical field of lamination processes, in particular to a double-layer glue and three-layer film method for manufacturing a diamond sticker, which comprises the following steps of: setting the total thickness of a film layer based on a top PET film, a glue layer and a substrate PET film, distributing the total thickness to the boundary of the film surface and the glue layer, adjusting the thickness of the PET film, loading the interface thickness control variable of the glue layer, and adjusting the thickness of the glue layer. And generating initial parameters of the film layer structure. According to the method, the lamination loads of different areas of the film layer are decomposed through a finite element analysis algorithm, the loads of multiple areas are uniformly distributed on the surface of the film, the problem of local pressure bearing unbalance easily occurring in a traditional lamination process is avoided, and the thickness of the film layer and the thickness of the adhesive layer are reasonably distributed in the design stage; different functional layers can effectively bear stress in the pressing process, the stress concentration phenomenon between layers is reduced, the pressure is adjusted point by point through multivariate analysis, the overall stress distribution is optimized, and the uniformity and stability of the film layer under the pressure are guaranteed.

The invention discloses a polyether-ether-ketone polishing brush wire material and a preparation method thereof, and belongs to the technical field of brush wire material preparation. The polyether-ether-ketone polishing brush wire material is prepared from, by weight, 50-70 parts of polyether-ether-ketone, 8-13 parts of a modified flexibilizer, 5-10 parts of a modified stabilizer, 3-6 parts of a light stabilizer, 6-12 parts of a lubricant and 2-5 parts of graphite, the modified flexibilizer is prepared from allyl glycidyl ether, benzyl dimethyl silane, vinyl acetic acid and 4-methoxyphenol, and the modified flexibilizer is prepared from vinyl acetate and 4-methoxyphenol. The modified stabilizer is prepared from pentafluorobenzoic acid, potassium tert-butoxide, 1, 10-phenanthroline, pentafluorobromobenzene, 4-aminophenol and pyromellitic dianhydride. The polyether-ether-ketone polishing brush wire material prepared by the method has excellent toughness, organic solvent resistance and wear resistance.

The invention provides a high-heat-conductivity diamond / metal joint and a brazing method thereof, and relates to the technical field of dissimilar material brazing connection. A brazing method for a high-heat-conductivity diamond / metal joint comprises the following steps that the surface of a diamond is machined through laser, and a periodic micro-nano structure is drawn on the surface of the diamond; and the surface, drawn with the periodic micro-nano structure, of the diamond is coated with brazing filler metal, fixing is carried out according to a diamond / brazing filler metal / metal sandwich structure, vacuum brazing is carried out, and the high-heat-conductivity diamond / metal connector is obtained. A periodic micro-nano structure is introduced into a diamond ablation area in the laser processing process, so that more efficient heat transfer and heat conduction performance improvement of an interface can be realized, the interior of a joint structure is uniform and has no defect, and the mechanical property of a joint is improved; the problem that the traditional connection technology is difficult to meet the mechanical property and heat transfer performance requirements of the diamond / metal interface at the same time is solved.

The invention discloses a method for preparing a personalized biphasic condylar scaffold, which comprises the following steps: collecting data to separate a mandibular digital model; selecting data on the opposite side of a lesion area in the mandibular digital model, and mirror-symmetric mapping the data to the lesion area to obtain a condylar head and neck prosthesis model; designing and printing a bone phase scaffold according to the condylar tissue structure morphology; preparing a cartilage phase scaffold; spraying a dense layer on the surface of the bone phase scaffold head, connecting the cartilage phase scaffold with the dense layer by a "dissolution-adhesion" process to form a dense layer bone-cartilage composite scaffold, thereby constructing a condylar biphasic composite scaffold; and designing a retention handle on the condylar biphasic composite scaffold to construct a personalized biphasic bionic condylar scaffold, which not only solves the problem that autologous bone transplantation for temporomandibular joint reconstruction cannot restore the condylar morphology and there are complications in the bone donor area, but also solves the problem that the mechanical properties of the materials and the degradation cycle of the existing prosthesis do not meet clinical needs.

The invention discloses a preparation method of a high-temperature wear-resistant multilayer material on the surface of a precision part, and relates to a preparation method of a high-temperature wear-resistant coating on the surface of the precision part. The invention aims to solve the technical problem of poor wear resistance of the surface coating of the precision part at high temperature at present. According to the invention, a magnetron sputtering multi-target co-sputtering mode is adopted, a laminated composite film is formed on the surface of a precision part such as a shaft, and selected target materials are a CoCrFeNi target, a Ti target and a CuNb target. In the preparation process of the multi-layer film, due to the fact that a large number of interfaces exist and can effectively hinder dislocation movement, and a large number of self-lubricating matter phases are matched together, the hardness and abrasion resistance of the material are improved, and the service life of the multi-layer film is prolonged. And the multilayer film structure can optimize the high-temperature phase transformation resistance of the whole coating by adjusting the thickness ratio and high-temperature elements between the layers, so that the high-temperature performance of the coating is remarkably improved, and the high-temperature wear resistance of the CoCrFeNi / Ti / CuNb multilayer material is more excellent.

The invention provides a through hole microneedle and a preparation method thereof, and the method comprises the following steps: providing a silicon wafer, and sequentially forming a silicon nitride layer and a silicon oxide layer on the front surface and the back surface of the silicon wafer; forming a first etching mask on the front surface of the silicon wafer by utilizing photoetching and etching processes, and carrying out first deep silicon etching to form a semi-through deep hole; forming a second etching mask on the back surface of the silicon wafer by utilizing photoetching and etching processes, and carrying out secondary deep silicon etching to form a through deep hole to obtain a pinhole structure; removing the silicon oxide layers on the front surface and the back surface of the silicon wafer; forming a silicon oxide layer on the inner wall of the deep hole by adopting a thermal oxidation process; forming silicon nitride layers on the front surface and the back surface of the silicon wafer and the inner wall of the deep hole; removing all the silicon nitride layers on the front surface of the silicon wafer; etching the silicon wafer by using an anisotropic wet method to form a needle body structure; and removing the residual silicon nitride layer and the residual silicon oxide layer.

The invention provides a doped ultra-high nickel precursor with a radial structure, preparation, a positive electrode material and application, the doped ultra-high nickel precursor is spherical, and the internal structure of the doped ultra-high nickel precursor is as follows: crystal grains are radially arranged and distributed from the core position of the sphere to the surface of the sphere; the chemical general formula of the doped ultrahigh nickel precursor is (Ni < x > Co < y > Mn < 1-x-y >) < 1-z > M < z > (OH) < 2 + delta >, x is more than or equal to 0.88 and less than or equal to 0.98, y is more than or equal to 0 and less than or equal to 0.10, 0 lt; z < = 0.10; m is a doping element, and delta is dynamically adjusted according to the valence state and the content of M. The doping elements in the doped ultrahigh nickel precursor provided by the invention are relatively uniform in doping and crack-free, and the interiors of the doped ultrahigh nickel precursor are radially arranged, so that the electrochemical performance of a lithium ion battery containing a positive electrode material prepared from the doped ultrahigh nickel precursor is remarkably improved.

The invention belongs to the field of basalt fiber photovoltaic supports, and discloses an energy-consuming basalt fiber photovoltaic support without trepanning connection, which is characterized in that a plurality of groups of energy-consuming connecting pieces are arranged on a stand column, and each energy-consuming connecting piece comprises a buckle, an energy-consuming assembly and a pre-embedded connecting steel plate; the buckle is used for fixing the basalt fiber supporting structure and providing stable inclined supporting force and vertical supporting force for the basalt fiber purline; the energy dissipation assembly consumes external load energy through friction, and the anti-seismic and wind-resistant performance of the support is enhanced; the whole support is connected without opening holes, stress is effectively dispersed, local stress concentration is avoided, and the material performance is kept; the energy dissipation assembly enables the support to be in rigid connection under the load and then to be in flexible connection, energy is consumed, load transmission is limited, and rod pieces are prevented from falling off and cracking. By adopting the bracket, the problems of mechanical property reduction and stability caused by trepanning are solved, the durability and the safety of the bracket are remarkably improved, and the bracket is widely applicable to different geographical and climatic conditions.

The invention relates to the field of piezoelectric fibers, and discloses a piezoelectric fiber and a preparation method thereof, and a piezoelectric sensor, the piezoelectric fiber comprises a conductive fiber core, a piezoelectric layer and an electrode layer, the outer surface of the conductive fiber core is alternately coated with the piezoelectric layer and the electrode layer, the innermost layer coating the outer surface of the conductive fiber core is the piezoelectric layer, and the electrode layer is the piezoelectric layer. The piezoelectric layer is arranged on the outer layer of the conductive fiber core, the electrode layer is arranged on the outermost layer far away from the conductive fiber core, the number of the piezoelectric layer and the number of the electrode layer are both at least one, the surface roughness of the conductive fiber core is smaller than 500 nm, the piezoelectric fiber can improve the conversion efficiency of mechanical signals and electric signals to a high degree, and the signal detection and collection sensitivity of the piezoelectric fiber is improved.

The invention discloses a method for achieving dissimilar material brazing based on hollow glass bead composite brazing filler metal, and relates to the technical field of dissimilar material brazing. The problems that in the brazing process of traditional dissimilar materials and between base metal and brazing filler metal, due to the fact that the difference of thermal expansion coefficients is large, the strength of a brazed joint is low, reinforced phase particles are added into brazing seams to relieve residual stress, the reinforced phase particles are prone to agglomeration, and the stability of the mechanical property of the joint is affected are solved. The hollow glass beads in the hollow glass bead composite brazing filler metal have low specific surface area, and agglomeration of a reinforced phase in the brazing process is effectively avoided; meanwhile, the hollow glass beads are well combined with the brazing filler metal, defects such as holes do not exist, the spherical structures of the glass beads are well reserved, the coefficient of thermal expansion of brazing seams is remarkably reduced, residual stress generated by a joint during brazing is relieved, and a brazing joint with excellent performance is obtained. The method for achieving dissimilar material brazing based on the hollow glass bead composite brazing filler metal can be obtained.

The utility model provides a battery monomer, a battery and a power utilization device, the battery monomer comprises a shell and an electrode assembly, the shell comprises a wall part and an end cover, the wall part encloses to form a containing cavity with an opening in a first direction, the end cover covers the opening, the end cover comprises a base body and an edge surrounding the periphery of the base body, and the edge is arranged on the base body. The edge is connected with the wall part and protrudes towards the side away from the wall part relative to the base body in the first direction, and the electrode assembly is arranged in the containing cavity. The base body is provided with a protruding part, the protruding part is arranged on the side, away from the wall part, of the base body, and in the first direction, the protruding distance, relative to the base body, of the protruding part is larger than or equal to the protruding distance, relative to the base body, of the edge. According to the battery monomer, the battery and the power utilization device in the embodiment of the invention, the stress at the edge can be reduced, the stress distribution is optimized, and the service life of the battery is prolonged.

The utility model discloses a bridge crane end beam weld joint cracking repairing structure, which relates to the technical field of hoisting machinery and comprises an end beam, a weld joint is arranged on the end beam, a welding rod is welded in the weld joint, and a support plate is fixedly mounted at the bottom of the end beam and corresponds to the welding rod. A plurality of pairs of transverse reinforcing rib plates are fixedly and symmetrically installed on the two sides of the supporting plate, the transverse reinforcing rib plates are symmetrically distributed on the two sides of the supporting plate at equal intervals, a pair of longitudinal reinforcing rib plates are symmetrically and fixedly installed on the two sides of the supporting plate, and a pair of transverse limiting plates are installed on the longitudinal reinforcing rib plates. A transverse limiting plate is fixedly installed on the end beam, a protruding block is fixedly installed on the transverse limiting plate, two pairs of fixing blocks are fixedly installed on the end beam, the fixing blocks are fixedly connected with the transverse limiting plate, and the problems that in the prior art, when a welding seam of the end beam of the bridge crane cracks, the whole end beam needs to be replaced or large-area repair welding needs to be conducted, and consequently the repair cost is high are solved.

The present invention belongs to the field of nuclear physics and nuclear technology application, in particular to a large curved thin-walled neutron beam window for a high-resolution neutron diffractometer in spallation neutron source technology and a manufacturing method thereof; the neutron beam window is designed as an integrated curved structure, the thickness of the beam window is designed to be 1.5 mm, and a transverse rib is provided in the middle of the neutron beam window to enhance structural stability without affecting neutron penetration; the present invention is designed as a thin-walled curved structure, so that the neutron beam window can more effectively penetrate neutrons, reduce neutron attenuation during transmission, thereby improving neutron utilization and accuracy of experimental data; at the same time, compared with a traditional planar structure, the curved surface design has better stress distribution, can effectively reduce stress concentration and mechanical deformation, improve the pressure bearing capacity and fatigue life of the neutron beam window, and ensure safe and stable operation of the experimental device.

The present invention belongs to the technical field of brake equipment, and discloses a high-speed train anti-bias wear brake pad, including a back plate and a plurality of friction blocks, the plurality of friction blocks are arranged on the back plate, a plurality of plug holes are provided on the back plate, a plurality of foot posts are provided on one side of each friction block, and the gap of each foot post is inserted into the plug hole, an elastic member is provided between the back plate and the friction block, and a limiting member is connected to the end of each foot post away from the friction block, and the limiting member abuts against the back plate under the pressure of the elastic member, and each friction block is provided with a plurality of protrusions and a plurality of depressions along the cross-sectional edge parallel to the friction surface, and the plurality of protrusions and the plurality of depressions are staggered, and the plurality of protrusions and the plurality of depressions are transitioned in a circular arc, and are arranged in a wave shape. The present invention improves the heat dissipation effect through the protrusions and depressions on the friction blocks, reduces heat accumulation and local overheating, and at the same time improves the braking performance and service life by increasing the contact area and improving the self-cleaning function, optimizes the stress distribution, and enhances the overall reliability and safety of the braking system.

The utility model discloses a hollow arch board for building construction, including board main body, and board main body is integrally extruded by light material, the board main body is as a whole arch structure, and is equipped with arch toe on both sides, the board main body is hollow structure, and is equipped with a plurality of webs inside, and the web divides the board main body inside into multiple continuous rectangular, triangle or trapezoidal hollow cavities, the utility model discloses integrally extruded by light material such as PVC or aluminum alloy, has reduced the dead weight of board significantly, and the board is as a whole arch structure, and then combines the web set up inside, has formed the stable mechanical structure, can effectively disperse pressure, has avoided the problem that the bending stiffness of flat plate structure is low and can not satisfy the bearing demand.

The invention relates to the technical field of cable preparation, in particular to a breakage-resistant photoelectric composite cable for wiring in a narrow space. Comprising a composite crosslinked polyethylene cable protection layer and an optical cable, and the composite crosslinked polyethylene cable protection layer comprises the following components in percentage by mass: 16-18% of precursor powder, 5-6% of a charring agent, 74.6-78% of PE, 0.6-0.8% of triallyl cyanate and 0.4-0.6% of dicumyl peroxide. The cerium nitrate, the yttrium nitrate and the sodium stannate are compounded to prepare the spherical rare earth nano material, and yttrium ions of the yttrium nitrate and the sodium stannate can finally form a crystal material with an approximately spherical polyhedral structure, so that the mechanical property of the composite crosslinked polyethylene cable protection layer is improved; according to the present invention, the composite material is not easily layered and cracked under the long-time pressure bearing condition, the microstructure of the composite material is changed so as to achieve the more compact structure, and the pressure resistance is improved to a certain extent.

The utility model relates to the field of agricultural cultivator spare and accessory parts, in particular to a hydraulic shaft of an agricultural subsoiler, which comprises a middle section and a connecting section, one end of the connecting section is coaxially connected to one end of the middle section, the connecting section is used for connecting required parts, and the cross-sectional area of the middle section is larger than that of the connecting section. External force borne by the hydraulic shaft in the working process is mainly tensile force or pressure, and at the moment, tensile and compressive stress borne by all sections, perpendicular to the axis of the hydraulic shaft, of the hydraulic shaft is inversely proportional to the area of the sections. The larger the cross section area of the middle section is, the smaller the tensile and compressive stress is. The larger the cross section area of the middle section made of the same material is, the larger the tensile force or pressure can be borne, the structural strength of the middle section can be improved, the service life of the middle section is prolonged, and then the service life of the whole hydraulic shaft is prolonged.

The invention discloses an inflection point slope adjustable double-ellipse diaphragm cavity molded line generation method and a diaphragm compressor, the method comprises the steps that a characteristic ellipse and an inflection point inclination angle are determined, and the inflection point inclination angle represents an inclination angle of a connection point of a molded line segment L1 and a molded line segment L2 in an X 'O' Y 'coordinate system; any point P on the characteristic ellipse and a characteristic point Q on the characteristic ellipse are determined, the Q point is an overrunning point, the P point is a chasing point, and therefore an elliptical segment PQ of a fixed inflection point slope inclination angle under the characteristic ellipse is determined; solving any chasing point P on the characteristic ellipse and a corresponding surpassing point Q, obtaining all molded line segment PQ elliptical line clusters under the characteristic inflection point dip angle, and obtaining the radius and deflection range of a film cavity molded line enclosed by the PQ elliptical line clusters; and two different sections of PQ elliptic molded lines L1 and L2 are combined and connected to form a complete diaphragm cavity molded line L of the diaphragm compressor, so that the requirements of the diaphragm cavity molded line of the diaphragm compressor are met. Through multi-parameter optimization design, the service life of the diaphragm is prolonged, and the reliability of the whole machine is improved.

The utility model relates to a tubeless all-steel truck radial tire tread pattern structure which comprises a tire tread, and further comprises longitudinal straight groove patterns which are respectively and uniformly distributed from a central line to two sides in the circumferential direction of the tire tread and comprise a first longitudinal straight groove pattern and a second longitudinal straight groove pattern; the transverse inclined grooves are connected between the adjacent longitudinal straight groove patterns and comprise first transverse inclined straight grooves connected with the adjacent first longitudinal straight groove patterns, second transverse inclined straight grooves connected with the adjacent first longitudinal straight groove patterns and second longitudinal straight groove patterns, and Z-shaped transverse inclined grooves; the inclination direction of the first transverse inclined straight groove is opposite to that of the second transverse inclined straight groove, and the inclination direction of the second transverse inclined straight groove is consistent with that of the Z-shaped transverse inclined groove. Compared with the prior art, the utility model can effectively solve the problems of blockage of broken stones or foreign matters and low drainage efficiency, and has good guidance quality, drainage performance, road holding force, sideslip resistance and multi-road-condition adaptability under the condition of high-speed driving.

The invention discloses a preparation method of a tough polyrotaxane hydrogel humidity brake and the prepared tough polyrotaxane hydrogel humidity brake. The preparation method of the tough polyrotaxane hydrogel humidity brake comprises the steps that under the conditions of a photoinitiator and ultraviolet irradiation, the tough polyrotaxane hydrogel humidity brake is prepared; acrylic acid as a monomer, vinyl polyrotaxane as a cross-linking agent and vinyl triethoxy siloxane as a reinforcing agent are subjected to a polymerization reaction to obtain the tough polyrotaxane hydrogel humidity brake, and the tough polyrotaxane hydrogel humidity brake shows a super-shrinkage behavior when meeting moisture, so that PHFB has the capability of being used as the humidity brake and can lift an object under the driving of moisture. The PHFB tough polyrotaxane hydrogel humidity brake is large in mechanical strength, high in toughness, high in contractibility and high in power capability, and can be used as a powerful fiber humidity brake.

The invention discloses an aluminum foil roller with a WC coating and a preparation method of the aluminum foil roller, and belongs to the technical field of metal material surface engineering technologies. A composite coating structure is arranged on the surface of a roller base body and sequentially comprises a transition layer, a gradient layer and a working face layer from inside to outside. According to the structural design, through the pinning effect, micro-metallurgical bonding and gradient transition, the bonding strength of the coating and a base body is greatly improved, stress distribution in the coating is optimized, the roller can effectively resist pressure stress and shear stress of aluminum foil under high rolling force, early-stage stripping and abrasion failure of the coating are fundamentally prevented, and the service life of the roller is prolonged. The service life is obviously prolonged. Meanwhile, the method provides a reliable remanufacturing way for the failed aluminum foil roller, and economic benefits are remarkable.

The invention provides an electric arc welding process of a multi-metal gradient structure, which comprises the following steps: S1, preparing at least two different metal materials, and carrying out pretreatment according to gradient structure requirements; s2, the metal materials are stacked and positioned, and it is ensured that welding areas are accurately aligned; s3, setting welding parameters including welding current, voltage, welding speed and protective gas type and flow; s4, pulse electric arc welding is adopted, and the metal materials are welded in a gradual transition mode; s5, stress relief annealing and surface treatment are conducted on the welded structure; through a special welding process, gradual change of metal components at a welding joint is realized, so that the mechanical property and the corrosion resistance of the welding joint are improved.

The invention relates to the technical field of short circuit ring assembly, and discloses a semi-automatic short circuit ring pressing device for a motor, which comprises a workbench, a belt conveyor is mounted at the top of the workbench, an angle plate is fixedly connected to the top of the belt conveyor, and a transmission assembly component for improving the placement precision of a short circuit ring is arranged above the belt conveyor. The transmission assembly component comprises a plurality of transmission belts for placing the short-circuit rings through self transmission thrust, high-precision placement of the short-circuit rings is achieved through transmission of the transmission belts to the short-circuit rings, the problem of contact between the short-circuit rings and the stator iron core is solved, firstly, the transmission belts ensure the stability of the short-circuit rings in the placement process, and the transmission efficiency of the short-circuit rings is improved; and the short circuit ring is accurately conveyed into the stator iron core through a transmission mechanism, so that the position deviation caused by manual operation is effectively avoided, the electrical performance of the motor is improved, the contact resistance is reduced, the local heating phenomenon is reduced, and the efficiency of the motor is favorably improved.

The utility model discloses a rotor bow based on NURBS type double curvature variable cross section type line belongs to steel wire rope manufacturing equipment rotor part technical field, and this rotor bow main part is NURBS type double curvature bending section, and the cross section width is gradually increased from the center to both ends along the length direction, each section is composed of elliptical streamline, intermediate horizontal line section and upper three point arc line compound, and the smooth continuous axial symmetry profile is formed. The main body both ends pass through lofting stretching transition section and equal cross section end portion fairing link. Through the coupling design of variable cross section geometry and double curvature bending structure, improve high -speed rotation dynamic balance, restrain eddy current and flutter, reduce vibration noise and optimize stress distribution, thereby promote the working stability of stranding machine and steel wire rope stranding quality.

The invention discloses a frame and a photovoltaic module, and belongs to the technical field of photovoltaics. The frame comprises a plurality of boundary beams and corner connectors which are sequentially connected end to end. Cavities are formed in the edge beams, a drainage notch is formed in the end of the bottom wall of the cavity of at least one edge beam, and a drainage opening is formed by the drainage notch and the adjacent edge beam; the corner connectors are connected between the two adjacent edge beams and extend into the cavity, and a water guide groove is formed in each corner connector and communicated with the water outlet. According to the technical scheme, the drainage notch is formed in the end of the bottom wall of the cavity of the edge beam, a tool can be used for providing support for the stamping face when the drainage notch is stamped, accordingly, the influence of machining lines near the drainage notch is relieved to a certain degree, the integrity and drainage efficiency of the frame structure are improved, meanwhile, the water guide grooves are formed in the corner connectors, and the service life of the corner connectors is prolonged. And drainage of accumulated water in the frame can be guided and accelerated.

The utility model discloses a noise-reducing herringbone synchronous belt, and relates to the technical field of synchronous belts. The herringbone synchronous belt capable of reducing noise is simple in structure, low in manufacturing cost and capable of reducing noise. A herringbone synchronous belt capable of reducing noise comprises a thin plate layer, oblique teeth distributed at equal intervals are fixedly connected to the top end of the thin plate layer, center holes are formed in the oblique teeth, a reinforcing layer is fixedly connected to the bottom end of the thin plate layer, a wrapping layer is fixedly connected to the bottom end of the reinforcing layer, connecting strips distributed at equal intervals are fixedly connected to the interior of the thin plate layer, and a grating frame is fixedly connected to the interior of the reinforcing layer. The helical teeth made of the flexible material of the hollow structure are meshed with the belt wheel, so that vibration can be reduced, noise is further reduced, meanwhile, under the action of the high-elasticity and high-damping material of the coating layer, vibration energy generated in the running process of the belt body can be effectively absorbed and dispersed, and noise is further reduced.

The utility model relates to the technical field of heat exchangers, in particular to a novel flexible graphite corrugated tooth composite gasket, which is formed by machining upper corrugated teeth on the upper surface and the lower surface of a planar steel plate or steel belt respectively. Graphite is adhered to the upper surface and the lower surface of the gasket through an adhesive, so that a graphite layer is formed on each of the upper surface and the lower surface of the gasket; a parting strip assembly is further arranged on the inner side of the gasket. When the corrugated tooth gasket is used, the compression ratio of the corrugated tooth gasket can be provided through the graphite layer, the rebound rate of the corrugated tooth gasket can be guaranteed through the gasket metal framework, the gasket can keep strong sealing, and it can be guaranteed that the sealing effect is not affected under the condition of pressure and temperature fluctuation.

This invention discloses a five-layer electrodeposited high-sealing corrugated pipe based on ultrasound assistance and its preparation method, belonging to the technical field of metal corrugated pipe manufacturing. It aims to solve the problem that in multi-layer electrodeposited corrugated pipes, it is difficult to effectively coordinate current density, surface quality, and interfacial bonding strength, leading to insufficient densification of the deposited layer, unstable interlayer bonding, poor wall thickness uniformity, and failure to meet airtightness standards, ultimately resulting in poor overall performance stability. This invention includes a five-layer composite structure in which the pipe wall is composed of alternating nickel-cobalt alloy and copper layers. Each layer of the five-layer composite structure undergoes ultrasonic vibration treatment during deposition. The corrugated pipe prepared by this invention has a uniform and dense deposited layer with good interlayer bonding. The five-layer alternating deposition layer composite structure not only achieves uniform stress transmission and dispersion, effectively delaying crack propagation and interfacial penetration, but also improves the uniformity of wall thickness distribution, enabling the corrugated pipe to exhibit higher structural stability and long-term reliability in a sealed environment.

The invention provides a staggered-direction-arranged mask plate for counteracting stress of IGBT (Insulated Gate Bipolar Translator) wafers, and relates to the field of semiconductor power devices. The mask plate comprises a plurality of IGBT chips; the IGBT chips are arranged in a staggered mode, one part of the IGBT chips are arranged in the 0-degree direction, and the other part of the IGBT chips are arranged after rotating by 90 degrees. The IGBT chips arranged in the 0-degree direction are diagonally distributed on a mask plate in a staggered arrangement mode; and the IGBT chips which are distributed at two sides in a 90-degree direction are filled and then are alternately arranged, so that mutual counteraction of stress in a local area is realized, and the warping of the wafer is reduced. Through the design of the masks arranged in the staggered direction, the warping problem of the IGBT wafer is reduced, the yield is remarkably improved, the production cost is reduced, the overall stability of the chip is enhanced, and an innovative solution is provided for efficient and stable production of the IGBT chip.