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The problem of choosing a bearing support layout method should be considered
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2. When the radial load and the axial load are accepted together; the angular contact bearing and the tapered roller bearing pairing device are often used for the support. The angular touch bearing has three kinds of positioning methods for the paired device. The two bearing outer ring wide end face opposing device The back-to-back device method is called. The two supporting force effect points fall outside the support span. This placement method is large due to the support span; the steel is good when the shaft is cantilevered; the inner and outer rings are disengaged when the shaft is heated and extended; Therefore, the shaft will not be stuck; therefore, the application is more extensive. However, if the pre-tensioning device is used, the pre-tightening amount will be reduced when the shaft is heated. The narrow end faces of the two bearing outer rings are called the face-to-face device method. The two supporting forces The effect point falls within the support span. This layout method is simple, easy to assemble, disassemble and debug, so it is more widely used; it is mainly used for short shafts and low temperature rise; but it must be paid attention to There is spare clearance. The axial clearance should not be too large; the working accuracy of the falling shaft is too large. When the axial load is large; when multiple bearings are required to be accepted together, the series connection of the bearing outer ring width and narrow surface relative device is often used. Method. Each bearing force effect point On the same side of the bearing to the same place so called, also known series. When selecting this method to place focus on the production layout and ensure that each receives a load bearing can be as even as possible.
3. The machine is in operation; usually the temperature of the main shaft or the drive shaft is higher than the temperature of the adjacent parts; therefore the shaft will heat up and extend. In order to adhere to the axis change sensitivity; in the support layout depiction; in the satisfaction of the axial positioning accuracy requirements together Also consider the need for the shaft to be elastic and elastic. The method of axial positioning and axial elasticity corresponds.
4. The bearing clearance is adjusted to control the working accuracy of the shaft. The axial azimuth adjustment of the shaft is to satisfy the special requirements of some meshing transmissions. For example: in the worm drive; the worm axis needs to fall in the center plane of the worm gear to ensure its Correct meshing; therefore, the worm wheel shaft can be adjusted in the axial direction. In the bevel gear transmission; the pitch cone cones of the two bevel gears need to be coincident; therefore, both bevel gear shafts can be axially adjusted.
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Graphite is an elemental element of elemental carbon. Each carbon atom is surrounded by three other carbon atoms (arranged in a honeycomb-like hexagon) to covalently bond to form a covalent molecule.
Since each carbon atom emits an electron, the electrons are free to move, so the graphite belongs to the conductor. Graphite is one of the softest minerals, and its use includes the manufacture of pencils and lubricants. Carbon is a non-metallic element that is located in the second periodic IVA family of the periodic table.
The specific use of graphite
1, for refractory materials, including refractory bricks, crucible, continuous casting powder, casting core, mold detergent and high temperature materials.
Magnesium carbon brick refractory material is the mid-60s, developed by the United States; in the world of magnesium carbon brick has been widely used in steel, and has become a traditional use of graphite. Aluminum carbon brick aluminum carbon refractories are mainly used for continuous casting, flat billet from the pipeline of the protective cover, underwater nozzle and oil well blasting tube.
Made of graphite and refractory crucible and its related products, such as crucible, curved neck bottles, plugs and nozzles, etc., with high fire resistance, low thermal expansion, melting metal process, by metal infiltration and erosion But also stable, good thermal shock stability at high temperatures and excellent thermal conductivity, so the artifacts and its related products are widely used in direct melting metal process.
2, steelmaking
Graphite and other impurity materials can be used as carbonizers in the steelmaking industry. Carburizing uses a wide range of carbonaceous materials, including artificial graphite, petroleum coke, metallurgical coke and Natural Graphite. In the world of steel-making carbon-based graphite is still one of the main uses of earth-like graphite.
3, for the conductive material
Graphite in the electrical industry is widely used as electrodes, brushes, carbon rods, carbon tubes, mercury rectifier cathode, graphite gaskets, telephone parts, TV picture tube coating and so on. Among them, Graphite Electrode is the most widely used, in the smelting of various alloy steel, ferroalloy, the extensive use of graphite electrodes. The graphite used in the electrical industry is very demanding on grain size and grade.
4, for wear and lubrication materials
Graphite is often used as a lubricant in the machinery industry. Lubricants are often not used in high-speed, high-temperature, high-pressure conditions, and graphite wear-resistant materials can be 200 ℃ a 2000 ℃ temperature and at a high sliding speed (loom / s) without lubricating oil work. Many of the equipment that transport corrosive media, widely used graphite materials made of piston rings, seals and bearings, they run, do not need to add lubricants, graphite milk is also a lot of metal processing (wire drawing, pull tube) when the good lubricant.
5, for corrosion-resistant materials
Graphite has good chemical stability. After special processing of graphite, with corrosion resistance, good thermal conductivity, low permeability and other characteristics, and widely used in the production of heat exchangers, reaction tank, condensate, combustion tower, absorption tower, cooler, heater, filter Pumps and other equipment. These equipment for the petrochemical, hydrometallurgical, acid and alkali production, synthetic fiber, paper and other industrial sectors, can save a lot of metal materials.
6, for the atomic energy industry and the defense industry
Graphite has a good neutron deceleration performance, the earliest as a slowdown agent for atomic reactors, "uranium-graphite" reactor is currently used more of an atomic reactor. As the power of the atomic energy reactor in the slowdown material should have a high melting point, stable, corrosion-resistant properties, graphite can meet the above requirements.
7, for anti-scaling anti-rust materials.
Graphite can prevent boiler fouling. Tests have shown that adding a certain amount of Graphite Powder to the water prevents the surface of the boiler from scaling. In addition, graphite coated with metal chimneys, roofs, bridges, pipes can be anti-corrosion and rust.
8, graphite new use
1) Flexible graphite products. Flexible graphite, also known as Expanded Graphite, is the 1970s developed a new graphite products. 1971 US research success of flexible graphite sealing material, to solve the problem of atomic valve leakage, followed by Germany, Japan, France also began to develop production. In addition to this product has the characteristics of natural graphite, but also has a special flexibility and flexibility. Therefore, it is an ideal sealing material, widely used in petrochemical, atomic and other industrial fields, the international market demand growth year after year.
2) the production of semi-metallic friction materials. Since the 1970s, clutches and automatic liners have been widely used semi-metallic friction materials. Semi-metallic friction material is the graphite and metal powder, steel fiber, clay powder made of synthetic resin. These automatic lining can be used for high-speed equipment such as aircraft, trucks and off-road vehicles, and clutch pads.
Graphite
Carbon Graphite,Graphite Mineral,Monolithic Graphene,Graphite Crystal
Fengcheng Ruixing Carbon Products Co., Ltd , http://www.lnfcrxts.com