19results about How to "Reduce wire breakage" patented technology

The invention provides a water-based oil agent with high heat resistance for carbon fibers and a preparation method of the water-based oil agent, and belongs to the field of carbon fiber oil agents, the oil agent comprises the following components: 1-10 parts of polyether modified polydimethylsiloxane, 5-15 parts of phosphate modified polysiloxane, 50-80 parts of a high-temperature-resistant auxiliary agent, 10-15 parts of an emulsifier, 1-3 parts of an antistatic agent, 1-3 parts of a defoaming agent and 60-150 parts of deionized water; the prepared water-based oil agent for the carbon fiber is good in heat transfer capacity, when a carbon fiber precursor is coated and then is in a preheating stage, local high temperature can be quickly transferred, so that heating is uniform, and the problem of oil agent loss caused by the local high temperature is solved; experiments prove that the thermal decomposition loss is less than 13.5% in the pre-oxidation stage at 325 DEG C.

The invention provides a polyacrylonitrile precursor, a carbon fiber and a preparation method thereof. The preparation method of the polyacrylonitrile precursor adopts wet spinning and comprises the steps of coagulating bath and hot water drafting, the hot water drafting at least comprises three times of hot water drafting, the swelling degree of the fiber after the second time of hot water drafting is 110-155%, and the total drafting multiplying power of the hot water drafting is 1.5-6.5 times. The modulus of the polyacrylonitrile precursor is 130 to 160 cN / dtex; the breaking strength of the polyacrylonitrile precursor is 5.80 cN / dtex to 6.50 cN / dtex; the average number of broken filaments per 10000 meters of the polyacrylonitrile precursor is not more than 15; the dispersion coefficient of the fineness of the polyacrylonitrile precursor is 3-5. The invention has the advantages of oil demulsification, less deterioration, high mechanical properties of the precursor, small fineness dispersion coefficient, and less broken filaments and broken filaments in a graphitization furnace.

The present invention discloses a high-thermal-conductivity and high-modulus carbon fiber fabric and a preparation method thereof. By controlling the surface roughness of a constraint path through which fibers pass in a high-thermal-conductivity and high-modulus carbon fiber weaving device, the roller radius of a fiber contact portion, the curvature radius of a wire guide hole, etc., the wear of high-modulus fibers during weaving and the generation of excessive bending angles are reduced, and the generation of broken and fuzzy fibers is reduced, thereby achieving successful weaving of high-thermal-conductivity and high-modulus carbon fibers while ensuring a high performance retention rate of the fibers.

The utility model relates to the technical field of control cables, in particular to an environment-friendly high-flame-retardant shielding control cable for special instruments, which comprises a plurality of mutually twisted control wire cores. The plurality of flame-retardant filling strips are filled in gaps among the control wire cores and are wrapped and fixed by a flame-retardant belt to form a cable core with a circular cross section; the outer wall of the cable core is coated with the composite shielding layer; and the outer sheath is extruded on the outer wall of the composite shielding layer. Through the combination of the copper strip shielding layer and the copper wire shielding layer in the composite shielding layer, respective advantages can be exerted on different frequency bands, a comprehensive shielding effect is provided, meanwhile, the elastic deformation space is increased by utilizing the convex structure of the copper strip, the overall flexibility of the cable is high, wiring in frequent bending and narrow space is facilitated, and the cable has a wide application prospect. And meanwhile, the aramid fiber braid layer is utilized to buffer and protect the copper wire braid layer, so that the probability that the copper wires are broken under the action of compression / tensile stress of the cable can be reduced, and the shielding performance of the cable is maintained.

The utility model provides an internal core structure of a humidifier, which relates to the technical field of internal core structures of humidifiers, and comprises a first buckle, a core shell arranged on one side of the first buckle, a second grating arranged on the surface of the core shell, a second buckle arranged on one side of the first buckle, and a second grating arranged on the surface of the second buckle. The surface, close to the moisture inlet and outlet, of the core shell is provided with the circular holes, the circular holes can effectively protect membrane filaments from being broken due to impact of high-flow-speed gas, it can be guaranteed that other membrane filaments enter the membrane filament bundle and fully flow on the outer surface, the grating is located outside the humidifier shell and can be conveniently cut off after being filled with pouring glue, and therefore the humidifying effect is good. Meanwhile, the circular holes can effectively disperse impact force of high-flow-speed gas, membrane filaments are prevented from being directly impacted by high-speed gas flow, therefore, the filament breaking phenomenon is reduced, normal work of the humidifier is guaranteed, the grating is located outside the humidifier shell and is convenient to cut off after being filled with glue, the production technology is simplified, the machining difficulty and cost are reduced, and the production efficiency is improved. And the production efficiency is improved.

This invention discloses a stranded electrode wire with a chip removal structure, a twisting device, and a twisting method. The stranded wire comprises two to seven monofilaments; the monofilaments are brass wire or copper-zinc alloy wire with a steel core; the two to seven monofilaments are first formed into a helical curvature matching the twist pitch through a pre-deformation mechanism, then twisted into a stranded wire blank, and finally drawn; after drawing, each monofilament retains the continuous helical shape formed by pre-deformation, and multiple monofilaments are tightly twisted together, forming continuous and equally deep helical grooves on the outer surface of the finished stranded wire; the helical grooves extend along the axial direction of the finished stranded wire, forming a continuous physical flow channel and chip-carrying space during electrical discharge cutting, resulting in a longer service life than traditional electrode wires, increased cutting speed, and effective reduction of wire breakage.

The invention relates to the technical field of novel macromolecular carbon materials, in particular to a method for preparing ultrafine-diameter high-performance mesophase pitch-based carbon fibers and a product, and the method comprises the following steps: preparing low-viscosity high-purity mesophase pitch by adopting a three-step method; adopting a melt extrusion spinning process to prepare mesophase pitch-based protofilament fibers; a pre-oxidation process; a mesh belt furnace process is adopted in the low-temperature carbonization process; graphite treatment; and carrying out electrolytic washing and sizing reel treatment. The mesophase pitch with low viscosity and high purity is prepared by adopting a three-step method, so that fine-diameter spinning is facilitated, and the fine-diameter yarn breakage condition is controlled; two sections of cooling gas are added, so that the defects that a spinneret is easy to cool and cannot be drafted for a long distance in the fine-diameter spinning process are overcome, and the situations that the fiber strength is reduced and the diameter is not uniform are avoided; the mesh belt furnace is used for pre-oxidation and low-temperature carbonization treatment, the high-temperature carbonization process is omitted, graphitization treatment is directly carried out, the risk that fine-diameter fibers are low in strength and prone to breaking in the carbonization process is avoided, and the broken filament amount and the abrasion process are reduced.

The utility model discloses a bending-resistant aluminum alloy core aluminum foil shielding power cable, which comprises four aluminum alloy core power wire core groups which are arranged at intervals of 90 degrees in the circumferential direction through a cross-shaped polyethylene isolation core frame and are twisted together to form a cable core, the twisting pitch of the cable core is 30mm to 55mm, each aluminum alloy core power wire core group comprises a small-diameter power wire core and a large-diameter power wire core, and the diameter of the small-diameter power wire core and the diameter of the large-diameter power wire core are smaller than that of the cross-shaped polyethylene isolation core frame. Each of the small-diameter power wire core and the large-diameter power wire core comprises an aluminum alloy conductor, a foaming EVA extruded insulating layer and an EVA lapped insulating layer, and the aluminum alloy conductor is formed by concentrically twisting an aluminum alloy single-wire inner core and a plurality of aluminum wires around the outer part of the aluminum alloy single-wire inner core; a PTFE wrapping antifriction layer, an aluminum foil shielding layer, a ferrite film wrapping layer and a polyurethane outer sheath layer are sequentially wrapped outside the cable core, and the thickness of the aluminum foil shielding layer is 6-20 microns. The power cable has better bending resistance, the aluminum foil shielding layer is not easy to crack, and the shielding performance is more stable.

The utility model discloses a lightweight anti-rotation garbage grab machine mobile cable comprising three power wire cores which are uniformly distributed at intervals of 120 degrees in the circumferential direction through a Y-shaped polyurethane elastomer isolation core, and the free ends of three forked separator plates of the Y-shaped polyurethane elastomer isolation core extend towards the outer side in an external expansion manner to form fan-shaped parts. Each sector part is provided with a longitudinal hole and is sleeved with a grounding conductor, the Y-shaped polyurethane elastomer isolation core is externally coated with a polyurethane extruded inner sheath, an AFRP reinforced woven tensile layer, a polyurethane extruded outer sheath and an EVA wear-resistant protective layer, and each power wire core comprises a power conductor, a semi-conductive nylon wrapping layer and a polyvinyl chloride insulating layer. Each power conductor comprises an aluminum alloy inner conductor layer formed by twisting aluminum alloy strands, and tinned copper strands are twisted around the outside of the aluminum alloy inner conductor layer to form a copper alloy twisted wire outer conductor layer. The cable is light in weight preparation, the conductor structure is not easy to loosen, the cable core structure is round and balanced, rotation is avoided, and the service life is prolonged.

The utility model relates to the technical field of tobacco processing, and particularly discloses an auxiliary tobacco shred adding device which comprises a scattering and feeding device, a hopper is arranged on the upper portion of the scattering and feeding device, an elastic clamping tongue is arranged at a discharging opening in the lower portion of the hopper, and the elastic clamping tongue is rotatably arranged in the hopper through a rotating shaft. A torsional spring is arranged on the rotating shaft, and the elastic clamping tongue bears upward elastic force under the action of the torsional spring; the limiting rod is movably arranged above the elastic clamping tongue and is used for limiting the elastic clamping tongue; the elastic clamping tongue is further fixedly connected with a pull rope, and the elastic clamping tongue swings up and down through downward intermittent drawing of the pull rope and the acting force of the torsional spring. The lower part of the hopper is also provided with a tobacco shred scattering device; and a tobacco shred feeding device is arranged at the lower part of the tobacco shred scattering device. The tobacco shred feeding device has the advantages of being convenient in tobacco shred feeding assisting operation, capable of remarkably improving working efficiency, labor-saving, good in effect and the like.

This utility model relates to the field of beet shredding blade technology, and in particular to a beet shredding blade and its manufacturing process. One end of the shredding blade is V-shaped and continuously arranged. The shredding blade includes a mounting plate and a shredding plate. The shredding blade is formed by bending the mounting plate and the shredding plate. The mounting plate has at least one fixing groove, and the shredding plate has continuously arranged V-shaped grooves. The end face of the shredding plate located at one end of the V-shaped groove has an angle A. The shredding blade has a simple structure and can be automatically sharpened during use. The hardness and strength of the shredding blade are increased by heat treatment. The angle of the blade head makes the shredding blade sharper after sharpening, and the shredded beet shreds are smooth and uniform in thickness. This can effectively improve the sugar filtration purity of the beet shreds during soaking, improve the purity, and reduce the breakage of the shreds.

The present invention belongs to the technical field of welding materials, and provides a smelting method for aluminum-based or aluminum-silicon-based coated hot stamping steel laser welding wire. The welding wire steel is composed of the following chemical components in weight percentage: C: 0.01%~0.30%, Si: 0.6%~1.3%, Mn: 1.6%~2.8%, S: 0.008%~0.018%; Cr: 0.4%~3.0%, Mo: 0.5%~2.0%, Ni: 1.6%~4.0%, Zr+Ti+Nb: 0.05%~0.1%, RE: 0~0.02%, P≤0.010%, Al≤0.005%, and the remainder is Fe and unavoidable impurities. The smelting method includes an electric furnace smelting process, an LF furnace refining process, a vacuum treatment process, and a billet continuous casting process. The welding wire steel can effectively overcome the problem of brittle fracture caused by the high content of Al element dissolving into the weld during laser welding.

The invention relates to superfine glass microfiber cotton and a preparation method thereof, and relates to the technical field of superfine glass microfiber cotton preparation, and the preparation method comprises the steps of raw material pretreatment, glass liquid preparation, glass filament preparation, glass microfiber cotton preparation and the like. And the finished product quality of the superfine glass microfiber cotton is improved. According to the method for producing the superfine glass microfiber cotton, the manual operation difficulty is low, the diameter of the prepared superfine glass microfiber cotton finished product is 0.8-1.5 microns, and the slag content is smaller than or equal to 0.4 wt%.

The invention belongs to the technical field of welding materials, and provides a smelting method of steel for an aluminum-based or aluminum-silicon-based coating hot stamping steel tailored blank laser welding wire. The steel for the welding wire is composed of the following chemical components in percentage by weight: 0.01%-0.30% of C, 0.6%-1.3% of Si, 1.6%-2.8% of Mn, 0.008%-0.018% of S, 0.008%-0.018% of P, 0.008%-0.018% of S and the balance of Fe. The steel comprises the following components in percentage by weight: 0.4%-3.0% of Cr, 0.5%-2.0% of Mo, 1.6%-4.0% of Ni, 0.05%-0.1% of Zr + Ti + Nb, 0-0.02% of RE, less than or equal to 0.010% of P, less than or equal to 0.005% of Al and the balance of Fe and inevitable impurities. The smelting method comprises an electric furnace smelting procedure, an LF furnace refining procedure, a vacuum treatment procedure and a square billet continuous casting procedure. The steel for the welding wire can effectively solve the problem of brittle fracture caused by the fact that a high-content Al element is dissolved into a welding seam in the laser tailored blank welding process.

This utility model discloses a yarn spreading device for unidirectional fabric production, including a tension control mechanism, a yarn spreading mechanism, a glue dipping mechanism, a glue extrusion mechanism, and a glue dipping tank. Arranged yarns pass sequentially through the tension control mechanism, the yarn spreading mechanism, the glue dipping mechanism, and the glue extrusion mechanism. The glue dipping tank is located below the glue extrusion mechanism and the glue dipping mechanism. The lower edges of the glue extrusion mechanism and the glue dipping mechanism are submerged in the glue dipping tank. The glue dipping mechanism includes multiple glue dipping rollers, which are driven rollers. The glue extrusion mechanism includes an upper glue extrusion roller and a lower glue extrusion roller. The lower glue extrusion roller is a speed-controllable driving roller, and the upper glue extrusion roller is a driven roller whose height can be manually adjusted in the vertical direction. The yarn spreading mechanism includes several fixed rollers and a first yarn spreading roller located at the foremost end. Supports are provided on both sides of the first yarn spreading roller, and rollers are mounted on the supports. The two sides of the first yarn spreading roller are fitted into the rollers. The surface of the first yarn spreading roller has multiple semi-circular protrusions. This invention, through the setting of the yarn spreading mechanism, enables the yarn to be fully spread before impregnation, thereby improving the uniformity of the surface density of the unidirectional fabric. The tension control mechanism can set different spreading tension according to the breaking strength of the yarn, reducing the problem of yarn breakage during the production process.

The utility model discloses a single steel wire rope bearing type anti-breaking electric hoist cable, which comprises multi-core control wire cores and steel wire bearing stranded wires, wherein the multi-core control wire cores and the steel wire bearing stranded wires are arranged at intervals and are jointly coated in a polyurethane elastomer outer sheath; the multi-core control wire core comprises four twisted-pair wire cores which are jointly twisted around a nylon fiber rope to form an inner-layer wire core body, the outer portion of the inner-layer wire core body is sequentially coated with a polyurethane elastomer inner sheath and a Kevlar woven mesh, four longitudinal holes are evenly formed in the polyurethane elastomer inner sheath in the circumferential direction, and each longitudinal hole is internally provided with four insulating wires and filled with a nylon fiber core material. Each twisted-pair wire core comprises a twisted-pair wire core body formed by twisting two insulated wires, and the twisted-pair wire core body is sequentially coated with a metal wire mixed-weaving sub-shielding layer and a semi-conductive nylon tape wrapping layer. According to the electric hoist cable, the single steel wire rope is used for bearing, the cable core structure is balanced and stable, the vibration reduction performance is better, core channeling is avoided, the shielding layer structure of the twisted control wire cores is optimized, wire breakage is not prone to occurring, and the durability is better.

The utility model relates to the technical field of steel cord production, in particular to a steel cord water bath quenching device which comprises a quenching liquid pool, and the interior of the quenching liquid pool is used for containing quenching liquid. The quenching circulating tank is arranged above the quenching liquid pool, and the quenching circulating tank is provided with a plurality of quenching tanks through which steel wires penetrate; the motor is connected to the quenching circulating tank and is used for pumping the quenching liquid in the quenching liquid pool into the quenching tank, so that the steel wire penetrating through the quenching tank is submerged by the quenching liquid; a water bath quenching device for steel cords is provided with a heat shield body. The motor heat insulation device is simple in structure, beneficial to being separated from and put into a quenching production process and good in flexibility, and when the motor heat insulation device covers the motor, a heat barrier can be effectively formed for the motor, and heat generated by quenching is prevented from directly influencing operation of the motor, so that the service life of the motor is prolonged, the failure rate is reduced, and the production efficiency is improved. And the risk of quenching interruption is also reduced, wire breakage can be effectively reduced, and the yield is improved.

The present invention discloses a technical field of a well repair machine control device, specifically a long-term overload-proof oil-electric dual-purpose well repair machine controller without a tension rope, comprising a well repair machine body, a controller body, a winch and a wire rope, wherein the controller body is arranged on one side of the upper end of the well repair machine body, and two first convex grooves and two second convex grooves are arranged on the top of the well repair machine body from left to right in sequence. The beneficial effects of the present invention are as follows: by utilizing the buffer device, when the well repair machine is overloaded, the buffer device gives the winch a leftward pulling force to make the winch move slowly to the right to prevent damage to the winch, and at the same time reduces the tension on the wire rope, thereby preventing the wire rope from being broken or ruptured due to overload; by utilizing the alarm device, when the well repair machine is overloaded, the alarm sounds an alarm, thereby reminding the staff that the well repair machine has been overloaded.

The invention discloses a preparation method of a lignin functionalized carbon nanofiber electrode material and application of the lignin functionalized carbon nanofiber electrode material in an all-vanadium redox flow battery. The method comprises the following steps: adding a proper amount of lignin into a mixed solution of polyacrylonitrile (PAN) and N, N-dimethylformamide (DMF) to obtain an electrospinning precursor solution lignin / PAN / DMF containing lignin; the preparation method comprises the following steps: carrying out electrostatic spinning by adopting an electrostatic spinning technology to obtain original electrospun nanofibers, sequentially carrying out pre-oxidation on the obtained original nanofibers in an air atmosphere and carrying out carbonization treatment in a nitrogen atmosphere to obtain the lignin functionalized carbon nanofiber electrode material, and applying the lignin functionalized carbon nanofiber electrode material to an electrode material of an all-vanadium redox flow battery. And the battery performance can be effectively improved. The high-activity biomass carbon nanofiber prepared by the preparation method disclosed by the invention can simultaneously have high electrochemical activity surface area and high electrochemical catalytic activity, so that the high-activity biomass carbon nanofiber can meet the actual application requirement of a high-power density electric pile. The method is simple, high in controllability and excellent in application prospect.