18results about How to "Reduce stress concentration factor" patented technology

The invention discloses a main shaft system of a wind driven generator, which relates to the technical field of wind power generation, and comprises a fixed shaft, a rotating shaft and two bearings, the rotating shaft sleeves the outer side of a shaft main body part of the fixed shaft, the rotating shaft is sleeved with a disc I and a disc II, and a reinforcing rib I is arranged between the disc I and the disc II; an inner concave structure is arranged at the transition position of the shaft main body part and the disc flange part of the fixed shaft, a transition ring is arranged in the inner concave structure, the transition ring axially extends to the bearing outside the inner concave structure, the transition ring is in interference fit with the bearing, the outer circular surface of the transition ring is in interference fit with the rotating shaft, and the inner circular surface of the transition ring is in clearance fit with the fixed shaft. The rotating shaft sleeves the outer side of the shaft main body part of the fixed shaft, so that the bearing capacity is higher; the rotating shaft adopts a double-disc shared reinforcing rib structure, so that the shaft system structure is relatively high in integral rigidity, simple in structure, light in weight and good in economical efficiency; and the transition ring is arranged at the concave structure, so that the stress concentration coefficient of the fixed shaft is greatly reduced on the basis of meeting the structural use requirement, and the use requirement of a large MW-level unit is met.

This utility model relates to the field of cable clamp technology and discloses a cable organizing and fixing clamp for broadcasting equipment rooms. It includes a base plate with several first mounting holes on its top surface, and a fixing device for fixing cables. The fixing device is located on the top surface of the base plate. Through the coordinated use of the base plate, elastic plate, and inclined plate, the cable can be organized and fixed. Existing cable clamps are mostly of fixed specifications or have a single clamping structure. This utility model designs the elastic plate and T-shaped plate as independent detachable modules. Elastic plates with different inner diameters correspond to different specifications of T-shaped plates, and the threaded hole positions and spacing of all T-shaped plates are standardized, achieving the universality of "one base plate adapting to multiple cable module specifications." This solves the problem that existing devices are difficult to use with cables of different diameters and are inconvenient to replace individually. It also allows for multi-layer stacking and fixing of multiple cables, making it convenient to use and quite practical.

This utility model discloses a fracture-resistant bolt connection pair structure for long-span steel bridges, including a bolt body, an anti-loosening nut assembly, an anti-corrosion washer assembly, a first steel bridge connection plate, and a second steel bridge connection plate. This utility model relates to the field of steel bridge connection structure technology. This fracture-resistant bolt connection pair structure for long-span steel bridges forms a dual stress dispersion structure through a tapered connector between the bolt head and the bolt segment, and four U-shaped stress relief grooves on the bolt segment. This significantly reduces the stress concentration coefficient at the bolt connection, preventing fatigue crack initiation under long-term alternating loads. Simultaneously, the main nut and auxiliary nut, in conjunction with an annular boss, compress the nitrile rubber elastic bushing, continuously compensating for preload attenuation caused by vibration, achieving a preload retention rate of over 90%. This solves the problem of uneven bolt stress caused by loosening of traditional nuts. It ensures the fracture-resistant performance of the bolt connection pair from both "fatigue resistance" and "loosening prevention" dimensions, meeting the core stress requirements of long-span steel bridges.

The present invention provides a design method for an adjustable steam seal and spring sheet for a steam turbine, and relates to the field of steam seals for steam turbines. The scheme adopted is: comprising a steam seal body and a steam seal ring, the steam seal ring is a segmented structure, comprising at least 4 steam seal arc segments, the steam seal body is provided with a mounting groove, a spring sheet is provided between the steam seal body and the steam seal ring, the spring sheet comprises a fixed end, a middle part and a free end in sequence, the widths of the fixed end, the middle part and the free end are all the same, the fixed end and the free end are both arc-shaped structures, the middle part is a straight structure, a slot is provided on the steam seal arc segment, the fixed end is inserted into the slot, the fixed end and the free end are both in contact with the top of the steam seal body cavity, the middle part can slide along the steam seal arc segment, a limiting plate is also provided on the steam seal arc segment, and the two ends of the limiting plate can be in contact with the steps of the mounting groove. The present invention can effectively maintain the minimum gap between the dynamic and static parts of the steam turbine, the good yield and sealing properties of the steam seal ring, and at the same time, the spring sheet is not easy to break and has a long service life.

The utility model discloses compressor buffer tank and connecting structure of pipe, including buffer tank body, the fixed port is with buffer tank body and is provided with transition layer one side, the bottom welding of buffer tank body has trapezoidal reinforcing pad, is provided with elastic transition subassembly between the flange and pipe body, the inside of pipe body is paved with wear -resistant bushing, the inside fixed mounting of pipe body has the flow cone, is provided with anti -vortex baffle in the inside of buffer tank body. The utility model discloses technical scheme through design gradually variable formula arc transition layer, can eliminate the section sudden change between fixed port and buffer tank body and pipe body, design elastic transition subassembly can effectively absorb the high -frequency vibration of compressor generation, reduce the weld dynamic stress peak value, design wear -resistant bushing resistance abrasive wear, cooperate flow cone and avoid the direct impact of airflow of pipe and buffer tank's welding root, utilize the steady flow effect of anti -vortex baffle and break the airflow vortex in tank.

This invention belongs to the field of communication automation technology and discloses a method for implementing a high-reliability HBM bonding process. The invention covers the entire HBM bonding process from wafer pretreatment and precise bonding to post-processing stress control by constructing three core modules: precise pretreatment of the bonding surface, high-precision bonding of heterogeneous wafers, and dynamic stress control after bonding. Employing core technologies such as precise detection and repair of micro-defects on the bonding surface, sub-micron-level alignment of heterogeneous wafers, and dynamic calculation and compensation of bonding interface stress, it overcomes the industry bottlenecks of traditional HBM bonding processes, including "difficulty in controlling bonding surface defects, low alignment accuracy, and easy interface stress failure." It achieves high-cleanliness pretreatment of the HBM bonding surface, sub-micron-level precise bonding of heterogeneous wafers, and dynamic adaptation and control of interface stress after bonding, significantly improving the yield, interface bonding strength, and long-term operational reliability of HBM bonding, thus meeting the advanced packaging requirements of next-generation high-bandwidth memory chips.

The utility model discloses an explosion-proof bending device which is arranged on a base. Comprising a bending mechanism and an edge cutting mechanism. The bending mechanism comprises a positioning block and a forming assembly. The forming assembly is arranged on the support, and the support is fixed to the upper surface of the base. The forming assembly comprises a driving piece, the tail end of the driving piece penetrates through the support, and a sliding block and a pressing plate are fixed to the tail end of the driving piece. A forming upper die is arranged on the inner side of the sliding block, and the pressing plate is located on the outer side of the forming upper die. The trimming mechanism comprises a trimming die, and a cutter equivalent to the outline of the inner wall of the fillet sheet metal part is formed on the trimming die; a wedge-shaped groove matched with the bottom end of the sliding block is formed in the trimming die. The sheet metal part bending device has the advantages that the edges of the sheet metal part are bent on the basis of a common bending machine, the corners of the sheet metal part are warped and not broken, then the corners of the sheet metal part with the edges bent are bent, the sheet metal part is integrated and does not need to be fixed in a welded mode, the sealing performance and the overall structure are stable, and the sheet metal part bending device is convenient to use. And the explosion-proof effect can be achieved.

The utility model provides a kind of battery shell and battery, wherein, battery shell includes shell body, the explosion vent hole being opened in shell body, and the explosion vent hole is sealed with the explosion vent hole cooperation and explosion vent piece, explosion vent piece is fixed in shell body by the welding layer formed by welding track, welding layer includes first track and second track, wherein first track is long side section, starting weld point is set on first track, can provide linear heat transfer path to avoid heat accumulation, heat two-way symmetrical diffusion can also significantly reduce thermal stress gradient, and provide enough power buffer space, starting weld point is also away from geometric mutation area to reduce stress concentration coefficient, by reconstructing starting weld point position, avoid the risk that explosion vent piece welding appears warping, welds and leaks, solve the structural failure problem of thin-walled shell explosion valve, synergistically realize power battery energy density promotion and safety performance promotion.

The present application relates to a multi-material composite parallel layered bead structure and design method, and belongs to the field of tire structure and manufacturing method thereof. The cross-sectional shape of the bead is hexagonal, the bead is composed of multiple composite layers stacked along the radial direction of the cross-section of the bead, the multiple composite layers contain at least two material layers with different elastic moduli, and the elastic modulus of each material layer is gradiently distributed along the radial direction of the cross-section of the bead; the laying direction of each material layer is parallel to the bottom side of the hexagonal cross-section, forming a parallel composite layered structure. The present application gradiently lays and arranges multiple materials with different elastic moduli along the radial direction of the cross-section of the bead, actively adjusts the stress proportion of each load-bearing layer, promotes the balanced distribution of the hoop tension in the full cross-section range, and thus improves the fatigue resistance quality and service life while maintaining the overall load-bearing capacity of the bead.

The utility model belongs to the field of ultrahigh pressure equipment sealing, and particularly discloses a sealing structure which comprises a first sealed part, a sealing ring and a second sealed part, a step is arranged at the front end of the first sealed part, the sealing ring is sleeved on the step at the front end of the first sealed part, and the second sealed part is sleeved on the sealing ring. The sealing ring and the front end of the first sealed part are both installed in the second sealed part, the front conical surface of the sealing ring abuts against the step of the second sealed part, and the rear conical surface of the sealing ring abuts against the first sealed part. According to the utility model, the sealing ring is deformed under the action of pretightening force and high pressure, so that the sealing effect is improved; and a gap exists between the sealing ring and the valve body, so that the inside and outside of the valve body are subjected to high pressure, the fatigue damage accumulation rate is reduced, and the valve body is protected.

The utility model discloses a connection sealing structure. The connection sealing structure comprises a container, an annular sealing ring and an end cover, an annular groove is formed in the upper end of the container and surrounds an upper port of the container; the annular sealing ring is arranged in the annular groove; the end cover is located above the container, the outer side of the end cover extends downwards to form a plurality of tooth parts, and the tooth parts are distributed in the circumferential direction of the end cover; when the end cover downwards plugs the upper end opening of the container, the lower end face of the end cover abuts against and tightly presses the annular sealing ring, and the tooth part is tightly pressed and attached to the peripheral wall of the container so that the end cover and the container can be fixed to each other. The multiple tooth parts can enhance the connection stability of the container and the end cover, and when a few tooth parts are loosened, the container and the end cover can still keep relatively fixed; due to the fact that the annular sealing ring is in a compressed state, when a gap is generated between the container and the end cover due to loosening of the tooth part, the annular sealing ring is expanded to achieve dynamic sealing, the stability of connection between the container and the end cover is guaranteed, and relative vibration is not prone to occurring.

The utility model relates to the technical field of joint connection discloses a kind of upper joint of connecting mechanism, including first joint body, first joint body includes pressure bottom plate, transition sleeve and two wing plates, two wing plates are symmetrically arranged in pressure bottom plate both sides, wing plate includes rectangular part and trapezoidal part, rectangular part is connected with pressure bottom plate, rounding treatment is carried out between rectangular part and pressure bottom plate, and the rounding radius of rectangular part and the inner wall of pressure bottom plate is greater than the rounding radius of rectangular part and pressure bottom plate outer wall, transition sleeve is arranged in the middle of one end of pressure bottom plate away from wing plate, wing plate, pressure bottom plate and transition sleeve outer wall are symmetrically provided with reinforcing rib;By setting wing plate and pressure bottom plate form stable bearing frame of U, and cooperate with the middle support structure of transition sleeve, the lift, thrust, lateral force and torsional load generated by flight body can be simultaneously and efficiently transferred, to avoid single direction stress concentration.

The utility model relates to an anti-fatigue variable-diameter axle, including axle journal section, dustproof plate seat section, wheel seat section, axle body section and middle connecting section along the X axis symmetry distribution, each section is through integrated forging to shape, axle journal section is connected with dustproof plate seat section transition through outer convex arc no.

The utility model provides a kind of crankshaft and compressor, crankshaft includes the crank, counterweight and main shaft being connected with each other, crank is used to be driven with connecting rod connection, main shaft has cylinder seat cooperation section, the ratio of the axial dimension of crank and the diameter of crank is between 0.98 to 1.2, the length of cylinder seat cooperation section accounts for 59.3% to 69.3% of the length of main shaft.The utility model application solves the stress concentration risk of small shaft diameter crank in prior art, easy to cause crank fatigue fracture, and further causes the problem of equipment failure.

The utility model discloses a high anti -vibration integrated waveguide coaxial converter, integrated shell, coaxial connector and end cover, the integrated shell includes integrated flange plate, circular waveguide pipe and integrated mounting seat, the integrated flange plate is equipped with the continuous circular conical surface transition structure at the root joint of circular waveguide pipe, the coaxial connector is connected through the internal thread wall of integrated mounting seat of outer thread, the end cover sets up at the right -hand member of circular waveguide pipe, the utility model has the advantages of: through integrated shell structure design, integrated flange plate, circular waveguide pipe, integrated mounting seat integral forming, the interface fracture risk of traditional welding type waveguide converter is thoroughly eliminated, and the stress dispersion effect of the stress characteristic of uniform distribution of circular waveguide pipe section and conical surface transition structure is combined, makes stress concentration coefficient reduce under the vibration environment, and compared with the transmission welding type structure, the anti -vibration life is improved.

The utility model relates to the technical field of electric vehicles, in particular to an electric vehicle temple support. Comprising a supporting arm, an integrally-formed rotating shaft mechanism is arranged at the top of the supporting arm, and an anti-skid base is arranged at the bottom of the supporting arm; the rotating shaft mechanism is of a U-shaped groove structure, the supporting arm is hinged to the frame through the rotating shaft mechanism, the rotating shaft mechanism further comprises a rotating shaft face, the rotating shaft face is parallel to the hinged portion of the frame, at least two vertical cutting seams are formed in the rotating shaft face and the cutting face adjacent to the rotating shaft face respectively, and a metal strip capable of being folded inwards is formed between the cutting seams. The metal strip is bent by 90 degrees towards the inner side of the U-shaped groove and fixed through welding. Efficient forming of the rotating shaft mechanism is achieved, material and cost limitation of the cold heading technology is broken through, the bearing capacity is greatly improved through the double-layer composite structure of the closed U-shaped groove, the scheme can flexibly meet the requirements of different materials and vehicle types, and a reliable technical path is provided for manufacturing of the electric vehicle temple support with light weight, long service life and low cost.

The present application relates to the technical field of semiconductor manufacturing, in particular to a step-by-step progressive wafer edge chamfering process, which comprises a first grinding step: driving a first profiled grinding wheel to grind the wafer edge according to a first set of grinding parameters to form an intermediate profile on the wafer edge, the intermediate profile at least containing a first bevel with a predetermined included angle with the wafer surface; a second grinding step: driving a second profiled grinding wheel to grind the intermediate profile according to a second set of grinding parameters to at least remove part of the first bevel to form a final target round profile. By designing a profile progressive forming strategy of first forming a bevel intermediate profile and then modifying it to a circular arc target profile, the grinding contact area is gradually transitioned from surface contact to line contact, avoiding the edge collapse and stress concentration caused by one-time extrusion of the profiled grinding wheel, and the stress concentration coefficient of the wafer edge is reduced.

This invention relates to a welding device for steel cages used in the production of utility poles. The device includes a welding lathe with a CNC positioning frame mounted on top. A welding device is fixedly connected to the outer side of the CNC positioning frame, and a welding head is fixedly connected to the bottom of the welding device. Multiple sets of positioning clips for fixing the ends of the steel cage for the utility pole are mounted on the top surface of the welding lathe. The welding head includes a laser emitter fixedly installed at the output end of the welding device. A straight cylindrical welding nozzle is sleeved on the outer side of the laser emitter, and an inner cylinder is provided at the bottom of the laser emitter. The inner cylinder includes three arc-shaped alloy lobes slidably connected to the bottom of the laser emitter. This invention achieves a gradual weld formation, which results in a more uniform stress distribution along the entire length of the weld, eliminating local stress peaks found in traditional equal-width welds. This prevents weld cracking during centrifugal forming, hoisting, and long-term service of the utility pole, and improves the load-bearing capacity and structural stability of the welded joints of the steel cage.