8results about How to "Reduce fatigue cracks" patented technology

This invention relates to a double diaphragm coupling that limits radial displacement and provides overload protection. The invention includes a driving adapter plate, comprising a first adapter plate flange and a first connecting surface extending axially along the center of the first adapter plate flange; a driven adapter plate, comprising a second adapter plate flange and a second connecting surface extending axially along the center of the second adapter plate flange; a spacer shaft with circumferentially spaced third connecting blocks extending axially; the first connecting surface and its corresponding third connecting surface are mated by engagement of the first and third connecting blocks; the second connecting surface and its corresponding third connecting surface are mated by engagement of the second and third connecting blocks. This invention limits the radial displacement of the diaphragm coupling when it is subjected to radial offset, preventing damage to the diaphragm and protecting the diaphragm coupling.

The application discloses additive manufacturing 5-series aluminum alloy powder material containing Ce and Yb elements and a preparation method thereof, and comprises the following steps: preparing a mixed material by weighing raw materials according to component proportions, and preparing Al-Mg-Sc-Yb-Ce-Mn-Si pre-alloy powder through vacuum melting and argon atomization, wherein the raw materials are as follows in terms of mass fraction: Mg: 4-12%, Sc: 0.6-0.8%, Zr: 0.1-0.8%, Mn: 0.2-0.5%, Si: 0.3-1.0%, Yb: 0.03-0.8%, Ce: 0.03-0.8%, and the rest is Al and other impurities. The application adds a certain amount of rare earth elements (Yb and Ce) and Mn and Si elements in the traditional AlMgScZr alloy powder, forms a second phase with alloy elements, plays a role in refining grains and improving crack resistance as a refining agent, controls the process, obtains powder with a certain particle size range through airflow screening, carries out additive manufacturing according to a certain process window, and through heat treatment, the strength of the additive manufacturing high-strength and high-toughness aluminum alloy is improved to 550 MPa level while maintaining high plasticity and toughness.

This invention discloses a cross-linked polyethylene insulated power cable and its preparation method, belonging to the field of power cable technology. The power cable, from the inside out, comprises: a conductor core, a conductor semi-conductive inner shielding layer, a main insulation layer, an insulating semi-conductive outer shielding layer, a semi-conductive buffer water-blocking layer, a corrugated metal waterproof sheath, and an outer sheath. The gaps between the conductor core strands are filled with semi-conductive resistive grease. The cable preparation method includes the following steps: S1, preparing the conductor core; S2, three-layer co-extrusion; S3, water-blocking layer extrusion; S4, sheath extrusion. This invention replaces the non-woven fabric tape with a foamed layer made from a blend of ethylene propylene diene monomer (EPDM) rubber and ethylene-vinyl acetate copolymer / styrene-butadiene rubber composite base material, achieving dynamic absorption of radial displacement in the cable. The synergistic effect of this dual design reduces fatigue cracking of the aluminum sheath caused by expansion thrust and prevents capacitive discharge caused by interfacial air gaps; thus improving the cable's current carrying capacity and periodic reliability.

The utility model provides a kind of exhaust pipe structure and rotatory compressor for rotatory compressor, comprising: exhaust pipe body, hole for connecting equalizing pipe is equipped on exhaust pipe body;Reinforcing structure, it is set on exhaust pipe body, reinforcing structure is used to increase the connecting length of hole and equalizing pipe.The utility model can increase the connecting length of exhaust pipe body and equalizing pipe, thereby increase the welding penetration of exhaust pipe body and equalizing pipe, guarantee welding quality, improve welding strength, thereby reduce the probability that the leakage at this welding place leads to compressor failure.

The invention belongs to the technical field of boiler protection materials. The invention relates to a non-crystalline material, in particular to an erosion-resistant non-crystalline material for a large circulating fluidized bed boiler and a preparation method thereof. The product provided by the invention comprises the following elements in parts by mole: 45 to 50 parts of Fe, 20 to 22 parts of Cr, 5.0 to 5.5 parts of Mo, 3.0 to 3.5 parts of W, 10 to 12 parts of B, 3.0 to 3.2 parts of C, 8.0 to 8.5 parts of Ni, 4.0 to 4.5 parts of Co, 2.2 to 2.5 parts of Mn and 0.4 to 0.6 part of Y; the amorphous material is in a pre-alloyed powder form, the microstructure of the amorphous material takes an amorphous phase as a matrix, and crystal phases with the size smaller than 50nm are dispersed and distributed in the amorphous phase; the degree of sphericity of the pre-alloyed powder is larger than 0.85, and the oxygen content of the pre-alloyed powder is lower than 600 ppm. The obtained material can effectively solve the problem that a formed oxidation film is prone to cracking and peeling off in the boiler thermal cycle process, and consequently the protection capacity of a coating formed in the using process on a boiler is attenuated.

This utility model discloses a reinforcement component for an outer ring plate and a box-shaped column in a steel structure building. It includes an outer ring plate welded to the surface of the box-shaped column. A short-faced perforated angle iron is provided at the top of the outer ring plate. A long-shank bolt is threaded into the inner cavity of the short-faced perforated angle iron. The long-faced perforated angle iron is fixedly connected to the outer ring plate via the long-shank bolt. The long-faced perforated angle iron is located at the bottom of the outer ring plate. A nut is threaded into the surface of the long-shank bolt, located below the outer ring plate. Two washers are slidably connected to the surface of the long-shank bolt. This utility model, through the combined use of the short-faced and long-faced perforated angle irons, can reinforce the weld joint between the outer ring plate and the box-shaped column with tensile force, providing additional fixing force beyond welding between the outer ring plate and the box-shaped column. This achieves the goal of providing additional fixing force after the outer ring plate and box-shaped column are fixedly connected, thereby reducing fatigue cracks caused by stress cycles.

This invention discloses a small header structure and operating method for a 650℃ high-efficiency ultra-supercritical tower boiler, relating to the field of boiler technology. It solves the problem of reaching the upper limit of ferritic heat-resistant steel in the main and reheat steam outlet headers of tower boilers. The invention includes a main header, connecting pipes, a small header, and an outlet pipe joint. Each tube panel of the final stage superheater or reheater in the tower boiler is connected to a small header via an outlet pipe joint; the small header is connected to the main header via connecting pipes; the main header, connecting pipes, and small header are all made of iron-nickel-based high-temperature alloy materials. This invention, through the main and reheat steam outlet header and small header structure, can reduce inter-tube temperature deviation, effectively eliminating the thermal stress caused by inter-tube deviation in conventional large header schemes. It can also reduce the wall thickness of the main header, as thermal stress is proportional to wall thickness, thus reducing thermal stress, improving compressive strength, and facilitating flexible operation.

This invention relates to the field of wire rope production technology, specifically to a double-parallel twist crane wire rope and its production process using a double-strand synchronous low-stress twisting method. The wire rope body has a 9-strand parallel twist structure, designated 3X40SF / 3X24F-3X7, comprising: an inner layer of 3 strands with a 3X7 structure twisted in an S-direction parallel twist; and an outer layer of 6 strands twisted in an S-direction parallel twist, with 3 strands having a 3X40SF structure and 3 strands having a 3X24F structure. The inner and outer layers are joined together using a Z-direction parallel twist. The wire rope body is prepared using a pre-tensioned tubular double-parallel twisting process. This invention, through a pre-tensioned tubular double-parallel twisting device, applies a constant and precise online pre-tension force simultaneously during the twisting process, forcing the wire to undergo lattice slip and dislocation reorganization during plastic deformation. This significantly eliminates residual stress generated during twisting and forging, solving the problems of low efficiency and uneven results associated with traditional offline pre-tensioning.