40results about How to "Reduce frictional heat generation" patented technology

The invention discloses a double-way friction stir welding method for dissimilar material mismatching processing. The problems are solved that in the butt joint and friction stir welding process of dissimilar metal such as aluminum/steel, aluminum/copper and magnesium/copper, the situations easily exist that a stirring head is abraded, formation of welding seams is poor due to a material glued tothe stirring head, and the defects exist in intermetallic compounds in the welding seams and exist in the welding seams. The method comprises the steps that 1, two parent materials to be welded are preprocessed, the thickness of a welding area is subjected to differentiation, and a mismatching connector is formed; 2, firstly, the parent materials to be welded are subjected to ultrasonic cleaning and preprocessing, and then acetone is used for wiping the surfaces of the parent materials; 3, the two parent materials to be welded are clamped and located; 4, the stirring head with a large-sized shaft shoulder is shifted to the sides of the low-melting-point parent materials, a small quantity of high-melting-point parent materials are inserted in the stirring head, and first-time welding is conducted; 5, the stirring head is replaced by a small-sized stirring head, the small-sized stirring head is further shifted to the sides of the low-melting-point parent materials, second-time repair welding is conducted, and accordingly the good-quality connection between dissimilar materials is formed. The double-way friction stir welding method is applied to butt joint and friction stir welding ofthe dissimilar metal such as aluminum/steel, aluminum/copper and magnesium/copper.

In a sealed rolling bearing for use in an environment where a large amount of water is splashed and the internal pressure of the bearing becomes negative, a ratio of the difference between an outer diameter of a seal sliding contact surface of an inner race and an inner diameter of a seal lip of an elastic seal member in its natural state to a diameter of a roll neck portion (shaft) on which the inner race is fitted is in the range of 0.27 to 0.40%. This provides reduced frictional heat generation of the seal lip and adequate pressing force applied to the seal lip, thus securing excellent seal performance without requiring an additional mechanism, such as a vent to a contact seal.

The invention discloses a bearing. The bearing comprises a bearing pedestal, a bearing cap, a tilting fillet, a supporting bush, a forward thrust pad, a forward thrust disc, a first oil cavity, a second oil cavity, a cooler and an oil-containing cover. The tilting fillet is fixed to the bearing pedestal. The supporting bush is fixed to the inner diameter side of the tilting fillet. The forward thrust pad is fixed to the front side of the tilting fillet. The first oil cavity is a sealing cavity formed by covering the bearing cap and the bearing pedestal. The second oil cavity comprises a hot oil inlet and a cold oil outlet. The second oil cavity communicates with the first oil cavity through the hot oil inlet. The cooler is arranged in the second oil cavity. The oil-containing cover is arranged at the outer diameter side of the forward thrust disc. The oil-containing cover and the forward thrust disc form an oil-containing cavity. An oiling groove is formed in the inner diameter side of the supporting bush. An oil throw-off cavity is formed in the inner diameter side of the forward thrust pad. The oil-containing cavity comprises a high pressure oil outlet and an oil pumping opening. The oil pumping opening communicates with the cold oil outlet of the second oil cavity. The high pressure oil outlet is divided into two oil ducts which communicate with the oiling groove and the oil throw-off cavity correspondingly. The bearing has high heat exchange efficiency, and bearing pad burning can be effectively avoided.

The invention discloses a cooling bearing. The cooling bearing comprises a bearing seat, a pad base, a positive thrust plate, a first oil cavity, a second oil cavity, a cooler and an oil driving cover, wherein the pad base is fixed to the bearing seat; a supporting pad is arranged on the inner diameter side of the pad base, and a positive thrust pad is arranged on the front side of the pad base; the second oil cavity communicates with the first oil cavity through a hot oil inlet, and the cooler is installed inside the second oil cavity; the oil driving cover and the positive thrust plate form an oil driving cavity; an oil injecting groove is formed in the inner diameter side of the supporting pad and is of a spiral shape; an oil throwing cavity is formed in the inner diameter side of the positive thrust pad; and the oil driving cavity comprises a high-pressure oil outlet and an oil pumping port, the oil pumping port communicates with the second oil cavity, and the high-pressure oil outlet communicates with the oil injecting groove and the oil throwing cavity. The cooling bearing has high heat exchange efficiency and can effectively prevent a bearing pad from being burnt.

The invention discloses a hydro-generator provided with high-efficient oil-cooling bearings. The hydro-generator comprises a stator, a rotor, a spindle, a fixed outer housing and the oil-cooling bearings, wherein the rotor is coaxially and fixedly connected with the spindle; the stator is coaxially and fixedly connected with the fixed outer housing; two sides of the fixed outer housing are fixed on two ends of the spindle through the oil-cooling bearings; each oil-cooling bearing comprises a bearing seat, a bush base, a forward pushing force disc, a first oil cavity, a second oil cavity, a cooler and an oil carrying housing; each bush base is fixed on the corresponding bearing seat; a support bush is arranged on the inner diameter side of each bush base; the front side of each bush base is provided with the corresponding forward pushing force bush; each second oil cavity communicates with the corresponding first oil cavity through a hot oil inlet; each cooler is arranged in the corresponding second oil cavity; each oil carrying housing forms an oil carrying cavity with the corresponding forward pushing force disc; an oil injection groove is formed in the inner diameter side of each support bush; the inner diameter side of each forward pushing force bush is provided with an oil shedding cavity; each oil carrying cavity comprises a high-pressure oil outlet and an oil pumping opening; each oil pumping opening communicates with the corresponding second oil cavity; and each high-pressure oil outlet communicates with the corresponding oil injection groove and the corresponding oil shedding cavity. The hydro-generator has high heat exchange efficiency, and bearing bushes can be effectively prevented from being burned.

The invention relates to a cooling device of a pavement cutting machine. The cooling device of the pavement cutting machine comprises a water tank on the cutting machine, a water outlet of the water tank is connected with a water inlet pipe of a booster pump, a water outlet pipe of the booster pump is respectively connected with a water spraying pipe I going into a mask of a cutting disc and a water spraying pipe II at the outer side of the mask by virtue of a three-way pipe, sprayers at the two sides of the cutting disc are respectively arranged on the water spraying pipe I, multiple water spraying holes are formed in each sprayer and comprise center water spraying holes and edge water spraying holes, water flowing out of each center water spraying hole is vertical to the corresponding sprayer, water flowing out of each edge water spraying hole is sprayed out toward the outer side of the corresponding sprayer in an inclined way, one part of water can be sprayed onto a rotating shaft of the cutting machine, and water in the water spraying pipe II is sprayed out in a water curtain shape and acts on a contact part between the cutting disc and a pavement, so that heat produced by friction is reduced. By the cooling device of the pavement cutting machine, the temperature of the cutting disc can be effectively reduced while the rotating shaft of the cutting machine can be cooled, and heat produced by friction between the cutting disc and the pavement can be reduced when the pavement is cut by the cutting disc.

The invention relates to the technical field of cutting beds, in particular to a cutting bed cutter cooling device. The device comprises a cutter head assembly used for installing a cutter and a cooling liquid supply assembly used for providing cooling liquid, a cutter edge allowing a cutter to penetrate therethrough and a cooling channel allowing the cooling liquid to pass therethrough are arranged in the cutter head assembly, one end of the cooling channel communicates with the cutter edge, and the other end of the cooling pipe communicates with the cooling liquid supply assembly through a cooling pipe. The cooling liquid provided by the cooling liquid supply assembly can enter the cooling channel in the cutter head assembly through the cooling pipe, reaches the cutter edge through the cooling channel and is sprayed to the cutter, the cutter is cooled, the cooling liquid sprayed to the cutter can also play a role in lubricating the contact between the cutter and fabric, and heat generated by friction between the cutter and the fabric is further reduced. Therefore, through the cooling and lubricating effects of the cooling liquid, the temperature of a heat source and heat generated by the friction can be effectively reduced, and the problem of adhesion of cut pieces after fabric cutting is fundamentally solved on the premise that the cutting efficiency is not affected.

The invention provides a nickel-chromium/chromium carbide metal ceramic composite coating and a preparation method thereof. The preparation method comprises the following steps that 1, the surface of a base material is pretreated, and the base material with the flat surface and without oxide skin is obtained; 2, the base material obtained in the step 1 is subjected to sand blasting treatment and then preheated, and the pretreated base material is obtained; and 3, NiCr-Cr3C2 powder is used, the base material obtained in the step 2 is subjected to hypersonic flame spraying, the mass ratio of NiCr to Cr3C2 is 1:3, the spraying distance is 380-400 mm, and the powder feeding rate is 100-120 g/min. The nickel-chromium/chromium carbide metal ceramic composite coating is formed on the base material, and the coating is high in compactness, low in porosity, high in bonding strength and excellent in corrosion and wear resistance.

The invention discloses a preparation method of a large-diameter 6061 aluminum alloy extruded pipe for a new energy automobile. The preparation method sequentially comprises the working procedures of alloy component optimization, smelting, melt purification, standing, degassing and deslagging, casting, homogenizing annealing, machining and extrusion. The alloy comprises the following elements in percentage by weight: 0.6%-0.70% of Si, 0.15%-0.20% of Fe, 0.28%-0.35% of Cu, 0.15%-0.20% of Mn, 0.85%-1.1% of Mg, 0.18%-0.25% of Zn, 0.14%-0.15% of Ti, 0.1%-0.3% of Cr, 0.05% of Ni and the balance of Al, the ratio of Mg to Si is adjusted to be 1.40%-1.53, and a heat treatment process of a cast ingot is optimized. Meanwhile, in order to ensure that the pipe meets the precision requirement and the surface quality requirement, a tool, a mold and extrusion parameters are designed, the aluminum alloy extruded pipe with good plasticity, toughness and rigidity, uniform component distribution and fine crystal grains is obtained, and therefore the use requirement of a hydrogen storage pipe of a new energy automobile is met.

The invention discloses an oil cooling bearing. A bearing cover is located above a bearing block, a bearing bush is fixed to the bearing block, a cooling oil groove in the axial direction is formed in the inner diameter side of the bearing bush, an oil inlet hole is formed in the middle portion of the cooling oil groove, and the two ends of the cooling oil groove are provided with hot oil discharging ways; a bearing cooling structure comprises a cooling cavity and a cooling body, the cooling body is located in the cooling cavity, the cooling cavity is provided with a hot oil inlet and a cold oil outlet, an oil inlet is communicated with the cold oil outlet of the cooling cavity, and the hot oil discharging ways are communicated with the hot oil inlet of the cooling cavity; and the cooling body comprises a cooling pipe, a bottom hole runner separating plate and a top hole runner separating plate, and the bottom hole runner separating plate and the top hole runner separating plate are distributed in the cooling cavity between the hot oil inlet and the cold oil outlet in a spaced manner. The high heat exchange efficiency is achieved, alarm halting caused by too-high oil temperature can be effectively prevented, and the bush abrasion or burning phenomenon caused by the too-high bearing bush and cooling oil can be effectively avoided.

The invention discloses a developer receiving container, comprising a container body, a rotating shaft located in the container body; The container body is provided with a powder outlet. The rotatingshaft is provided with a powder scraping blade for scraping the toner out of the powder outlet, and a plurality of groups of spiral blade groups arranged at equal intervals along the axial direction of the rotating shaft; Each helical blade group includes a first blade, a second blade, and a second blade on opposite sides of the rotating shaft. The first blade is positioned on a side of the secondblade adjacent to the powder outlet; The first blade and the second blade both comprise straight segments, and the ends of the straight segments are connected with spiral segments. The spiral segmentspirally extends along the circumferential direction of the inner cavity of the container; A spiral segment rotation track of any one of the first blades at least partially overlaps with a straight segment rotation track of an adjacent second blade; The rotational trajectory of the helical section of the second blade is located between the rotational trajectory of the straight section of the second blade and the rotational trajectory of the straight section of the adjacent second blade. The rotational trajectory of the helical section of the second blade is located between the rotational trajectory of the straight section of the second blade and the rotational trajectory of the adjacent straight section of the second blade. Compared with the prior art, the invention has the advantages ofsimple structure, fast and uniform material feeding, and less friction and heat generation.

The invention discloses a flame-retardant CPVC tubular product and a preparation method thereof; the flame-retardant CPVC tubular product includes the following components in parts by weight: 90-110 parts of a CPVC powder, 10-20 parts of a polytetrafluoroethylene powder, 5-15 parts of a toughening agent, 6-9 parts of a compound lubricant, 6-10 parts of a stabilizer, 1-5 parts of an AL-PTBBA nucleating agent, 1-3 parts of aluminum hydroxide, 1-3 parts of magnesium hydroxide, 2-6 parts of hydrotalcite, 1-3 parts of active calcium carbonate, 5-10 parts of diisooctyl phenyl phosphite, and 5-10 parts of triisopropyl phosphite. The preparation method of the flame retardant CPVC tubular product includes the steps: S1, weighing the materials; S2, preliminarily mixing to obtain a first mixture; S3,mixing again to obtain a second mixture; and S4, putting the second mixture into a twin-screw extruder, carrying out extrusion molding, and finally obtaining the finished product. The prepared CPVC tubular product has the advantages of slow linear burning rate, excellent flame retardancy and almost no production of burning particles or burning droplets and high tensile strength.

The invention discloses a novel flame-retardant magnesium alloy with a high damping performance and a processing process of the novel flame-retardant magnesium alloy with the high damping performance.The magnesium alloy comprises, by weight, 0.1-0.2wt% of B, 0.8-1.2wt% of Li, 2.0-2.5wt% of In, 0.4-0.8wt% of Bi, 3.0-4.0wt% of Cu, 0.8-1.2wt% of Hf, 4.0-5.0wt% of Mn, 3.5-3.8wt% of Al and the balancemagnesium. A flame-retardation scheme for magnesium alloy combustion caused by friction or external fire heating is provided. Predictably, implementation and industrialization of the magnesium alloycan greatly promote commercial demands on flame-retardant magnesium alloy in the field of light weight in China.

The invention relates to a metal reinforced retainer for a liquid oxygen pump main shaft bearing and a preparation process thereof, the retainer comprises a plurality of retainer blocks, a fixing ring and a rivet sleeve, each pocket is composed of two adjacent retainer blocks, two sides of each retainer block are respectively provided with a convex positioning structure, and each convex positioning structure is provided with a convex groove. Limiting grooves matched with the convex positioning structures in shape are evenly formed in the end faces of the fixing rings in the circumferential direction, the fixing rings are arranged on the two sides of the multiple retainer blocks and connected with the convex positioning structures in a matched mode through the limiting grooves in the fixing rings, and the rivet sleeves are installed in rivet holes of the retainer blocks respectively. And a plurality of rivet rods are used for fixing. According to the scheme, the influence of the large linear expansion coefficient of a polytetrafluoroethylene material on the guide gap of the guide flange of the retainer and the gap between the pocket and the steel ball can be avoided, the structural stability, reliability and high-speed performance of the retainer at low temperature are guaranteed, the retainer can be suitable for the low-temperature and high-speed working conditions of the liquid oxygen pump, and meanwhile the weight of the retainer can be reduced as much as possible.