Ironmaking and sintering equipment, such as coking machine, coke pusher, limestone and ore sintering equipment, large blower, top equipment such as ore bucket traction wire rope, cupola, blast furnace, belt conveyor, etc. Most of them are exposed to the atmosphere, dust and corrosive smoke, which are prone to corrosion, abrasive wear and cavitation. Corresponding bearings, gears, worm wheels, hydraulic systems, wire ropes, etc. It should be lubricated. Coking machinery is often exposed to air full of pulverized coal, so it must be sealed and lubricated. For example, fire-retardant hydraulic oil such as water-glycol should be used in hydraulic systems such as oven door switch, rollover, water spray quenching vehicle, etc. The shaft of belt conveyor should be lubricated with lithium-based or compound calcium-based grease. The coke pusher works indirectly and bears impact load. In the coal dust and high temperature environment, it is necessary to use extreme pressure lithium grease with good heat resistance and water resistance or extreme pressure lubricating oil with oxidation resistance and rust prevention for circulating lubrication, and the hydraulic system should also use flame retardant hydraulic oil. Because there are dust and corrosive smoke in some machinery for gas purification and chemical by-product recovery, the lubricant used for gas conveying machinery should be oxygen-resistant rust-proof turbine oil and a circulating lubrication system with filters. Limestone and ore sintering equipment often works under dust, vibration and high temperature, and compound calcium-based, compound lithium-based, bentonite or compound aluminum-based grease should be used. Generally, the top equipment such as large blast furnace and bucket traction wire rope can be lubricated by No.0 or 1 extreme pressure lithium grease dry oil lubrication system, and the top machinery can use phosphate flame retardant liquid as hydraulic medium. The hot metal ladle is heavy and has high temperature, so it needs to be lubricated with extreme pressure lithium-based grease with dropping point greater than 125℃.
Lubrication of steelmaking equipment
The operation of modern steelmaking furnace is controlled by computer with high degree of automation. The equipment used needs the corresponding lubrication system and lubricant. In the oxygen converter equipment, the oxygen blowing converter is supported by the limiting rotating shaft, and the supporting rolling bearing is lubricated by lithium molybdenum disulfide, hydrostatic bearing and PTFE oil pad, or grease. Lubrication of medium and heavy load industrial gear oil for drive gear of frequency converter. There are many lubrication points of main auxiliary equipment, such as exhaust fan, motor, loading crown block, crane, etc., which are lubricated by corresponding grease dry oil lubrication system, and the transmission gear is generally lubricated by oil bath. The rolling bearings of continuous casting machine, including caster turntable, crown block, die thrower, spindle table, etc., are usually lubricated with composite aluminum-based grease because of their high temperature. Lubricant is used to lubricate the mold to prevent the mold from wearing and sticking. The hydraulic medium for continuous casting is usually water-glycol or phosphate medium.
Oil for metallurgical equipment
1) sintering equipment: belt conveyor: 150 industrial gear oil; Disc feeder: 150 industrial gear oil; Elastic slideway of sintering machine: 1 composite aluminum-based grease; Bearing of exhaust fan of sintering machine: HL32 hydraulic oil; Wheel bearing of sintering machine trolley: composite aluminum grease; Raw material grab crane: 150 industrial gear oil; No.2 universal lithium grease for wheel bearings; 2) Ironmaking equipment: blast furnace turbine blower: HL32 hydraulic oil; Electric clay gun machine: 320 industrial gear oil for gear transmission; Mud orange and thrust bearing: No.2 universal lithium grease; Blast furnace feed hoist: 220 industrial gear oil; Wire rope of feed winch: ZM wire rope grease; Centralized lubrication of top distribution and sealing device of big and small bell pull rod: filtering waste engine oil; Weighing truck: axle oil for running bearings; Air compressor: 100 reciprocating compressor oil; : 150 industrial gear oil; Centralized lubrication system: 1 composite aluminum grease; Hydraulic system: L-HL32 hydraulic oil; Hot blast stove: L-CKC 100 industrial gear oil is used for various valves, and semi-fluid lithium-based grease is used for various open gears. 3) Steelmaking equipment: worm gear of open hearth reversing valve: No.460 industrial gear oil; Rolling bearing of open hearth blower: No.2 universal lithium grease; Metallurgical cranes (casting cranes, ingot cranes, ingot cranes): 320 and 460 industrial gear oils are used for all parts, 1 composite aluminum-based grease is used for centralized lubrication system, ZM wire rope grease is used for wire ropes, semi-fluid lithium-based grease is used for open gears, and 320 and 460 industrial gear oils are used for worm gears; Mixer: 320 and 460 industrial gear oils are used, and the centralized lubrication system adopts 1 composite aluminum-based grease; Green crane (magnetic crane, grab crane): 150 industrial gear oil, No.2 universal lithium base grease for wheel bearings, and ZM wire rope grease for wire ropes. 4) Rolling equipment: thin oil system on the rolling line: 460 industrial gear oil (medium and heavy load); Key dry oil lubrication system: 1 composite aluminum grease; Thin oil lubrication system for main motor bearing: 32, 46 anti-wear hydraulic oil (oil film bearing oil); Open gear: semi-fluid lithium-based grease. Note: industrial gear oil can use L-CKB, L-CKC or L-CKC, L-CKD (medium and heavy load) industrial closed gear oil.
Lubrication characteristics of rolling mill
1. Lubrication of rolling equipment (1) Rolling mill: Its main equipment includes rolling table, cardan shaft and its balancing device, gear rack, main coupling, motor coupling and motor, front and rear coilers and uncoilers, etc. (2) Requirements of rolling mill for lubrication: dry oil lubrication, such as input roll, pusher, discharger, vertical roll, stand, rolling mill roll, rolling mill work roll, rolling mill screwdown device, universal joint shaft and bracket, cutter, looper, guide plate, output roll of furnace, etc. Thin oil circulation lubrication, such as Baosteel 2030 five-stand tandem cold rolling mill, emulsion system for cooling and lubricating strip steel and uncoiler, lubrication of five stands, feed roller, rolling shear, guide roller, steering roller, coiler, gear oil, temper mill and other equipment, and oil film bearing system of each stand; The bearings of high-speed and high-precision rolling mills are lubricated with oil mist and oil gas. (3) Common media for process lubrication and cooling of rolling mill: In the rolling process, in order to reduce the friction between the rolling roller and the workpiece, reduce the rolling force and power consumption, make the workpiece easy to extend, control the rolling temperature and improve the quality of the workpiece, it is necessary to add process lubrication and cooling media between the contact surface of the rolling roller and the workpiece. The basic requirements of cooling medium for rolling mill process lubrication are: suitable oiliness; Good cooling ability; Good oxidation stability, rust resistance and physical and chemical index stability; Good filtration performance; It has a good cleaning and cleaning effect on the roller and product surface; Cold rolled strip steel has good annealing performance; Will not endanger human health; The oil source is easily available and the cost is low. There are many kinds of lubricating and cooling media for rolling mill process, and different rolled materials need different media; The following is a brief introduction: rolling aluminum strip and aluminum foil, using kerosene with additives as cooling and lubricating medium. WISCO 1700 cold rolling mill and rolling emulsion are 45-50℃ in summer and 50-55℃ in winter. The mass fraction of emulsion used is 1.2-4.5%, and the maximum mass fraction is 7%, usually greater than 30%. The concentration of thin rolled strip is higher, and the concentration of thick rolled strip is lower. The PH value, mass fraction and iron soap index of emulsified oil used are tested every 8 hours, and comprehensive analysis and testing are conducted once a week. 2. Lubricants and greases for rolling mill lubrication (1) Commonly used lubricants and greases for rolling mills: small and medium power gear reducers: LAN68, L-AN 100 total loss system oil or medium load industrial gear oil; Small rolling mill: L-AN 100, L-AN 150 total loss system oil or medium load industrial gear oil; Gears, worm gears and sprockets for high load and harsh conditions: industrial gear oil for medium and heavy load; Rolling mill is equipped with transmission gear and screw-down device, shearing machine and pusher: steel rolling oil, medium and heavy industrial gear oil; Oil film bearing for steel rolling: oil film bearing oil; Dry oil centralized lubrication system, rolling bearings: 1 No.2 and No.2 lithium-based grease or composite lithium-based grease; Heavy machinery and rolling mills: No.3, No.4 and No.5 lithium-based grease or composite lithium-based grease; Dry oil centralized lubrication system, rolling mill rolls: calendering grease (winter 1 No.2, summer No.2) or extreme pressure lithium-based grease, medium and heavy industrial gear oil; Dry oil centralized lubrication system, gear box, coupling 1700 mill: compound calcium lead grease, medium and heavy industrial gear oil. (2) Selection of lubrication form of typical parts of rolling mill: thin oil circulation lubrication (including sectional cooling lubrication system) is adopted between the work roll and the cooling system of rolling mill; The working roll and backup roll bearings of rolling mill are generally lubricated with dry oil, and at high speed, they are lubricated with oil film bearings, oil mist and oil gas. The gear rack of the rolling mill, the motor bearing and the reducer in the voltage device are lubricated by thin oil circulation; The rollers, couplings, cardan shafts, their balancing mechanisms and plane guide friction pairs in the window of the rolling mill are lubricated by drying oil. 3. Brief introduction of common lubrication system of rolling mill (1) Concentrated lubrication system of thin oil and dry oil: Because the structures and lubrication requirements of various rolling mills are very different, different lubrication systems and methods are adopted on rolling mills. For example, parts such as sliding bearings and rolling bearings with simple structures can be lubricated by monomers such as oil cups and oil rings. For complex friction pairs, the centralized lubrication system of thin oil or dry oil is adopted. Centralized lubrication system can be divided into manual, semi-automatic and automatic control systems in driving mode, and can be divided into throttling, single-line, double-line, multi-line and progressive systems in pipeline arrangement. (2) Rolling mill process lubrication system: According to different working conditions and media used, the pressure of the rolling mill process lubrication system is often around 0.4- 1.8MPa, the flow rate per minute can be as large as several hundred to several thousand liters, and the filtration accuracy of the media is less than 5 microns. The common nozzles and sectional cooling devices spray the media on the rollers and rolled materials, which has strict requirements on the pressure and temperature of the sprayed media. Therefore, the temperature of injection medium and oil (medium) liquid is controlled by pressure and temperature control valves. (3) Lubrication system of rolling oil film bearing: The lubrication system of rolling oil film bearing includes dynamic pressure system, static pressure system and mixed dynamic and static pressure system. The liquid friction condition of hydrodynamic bearing can only be formed when the roller has a certain speed. When the rolling mill is started, braked or reversed, its speed change can not guarantee the liquid friction condition, which limits the application range of dynamic pressure bearings. Hydrostatic bearing makes the journal float in the bearing through hydrostatic pressure, and the formation of high-pressure oil film has nothing to do with the speed. When starting, braking, reversing or even standing still, it can ensure the liquid friction state, has large bearing capacity and good rigidity, and can meet the requirements of any load and speed, but it needs a special high-pressure system and has high cost. Therefore, when starting, braking, reversing and low speed, the static pressure system is used to supply high-pressure oil. But at high speed, the static pressure system is closed and the dynamic pressure system supplies oil, which is ideal. (4) Oil mist lubrication and oil-gas lubrication system for steel rolling: Oil mist lubrication is powered by compressed air, which atomizes oil and sends it to the lubrication part through pipelines and condensation nozzles. Used for lubrication of gears and worm wheels, especially for large, high-speed and heavy-duty rolling bearings. It has high lubrication and cooling efficiency; And can save fuel; Because the oil mist has a certain pressure (2-3KPa), it can prevent impurities and water from entering the friction pair, and the service life of the bearing is increased by 40%. Oil mist lubrication system includes water filter, solenoid valve, pressure regulating valve, oil mist generator, conveying pipeline, condensing nozzle, control and detection instrument, etc. Oil mist generator is the core equipment. Oil-gas lubrication has a better effect than oil mist lubrication. It relies on the flow of compressed air to send oil to the lubrication point along the pipeline. Oil-gas mixer and oil-gas distributor are key components of oil-gas lubrication system, and some imported equipment in China have adopted oil-gas lubrication. 4. Common lubrication devices for rolling mills The common lubrication devices for heavy machinery (including rolling mills and their auxiliary machinery and equipment) include dry oil, thin oil and oil mist lubrication devices; Domestic lubrication machinery and equipment can basically be supplied in complete sets. The main lubricating devices are introduced here, and their names and performances are as follows: Heavy machinery standard thin oil lubricating device (JB/ZQ4586-86) This standard is applicable to the thin oil lubricating device in the thin oil circulating lubricating system of metallurgical, heavy and mining machinery and equipment. Industrial lubricants with working medium viscosity grade of N22—N460, and the circulating cooling device adopts tube cooler. The nominal pressure of the thin oil lubrication device is 0.63MPa；; Low filtration accuracy, viscosity of 0.08mm and high viscosity of 0. 12 mm; ; Industrial water with cooling water temperature less than or equal to 30℃; Cooling water pressure is less than 0.4MPa；; When the oil inlet temperature of cooler is 50℃, the temperature drop of lubricating oil is greater than or equal to 8℃; The steam pressure is 0.2-0.4MPa. The pressure ranges of the main lubricating parts above are 10MPa, 20MPa and 40MPa, of which 20MPa and 40MPa are products produced by imported technology and produced by Taiyuan Lubrication Equipment Factory and Shanghai Lubrication Equipment Factory. Except the latter two products, other products are produced by Shenyang Lubrication Equipment Factory and Xi 'an Lubrication Equipment Factory. Thin oil systems and components are produced by four companies. 5. Installation and maintenance of common lubricating equipment for rolling mill (1) Equipment installation: Carefully review the piping drawings of lubricating devices, lubricating devices and mechanical equipment, and review the basic drawings to confirm the correct connection and installation relationship before installation. Check the equipment and components before installation; The product must have a certificate of approval, and the necessary equipment and components should be inspected and cleaned before pre-installation (for more complex systems). After pre-installation, clean the pipeline; Check the parts and connectors, and if they are lost or damaged, supplement them with qualified and clean parts. Cleaning method: degreasing with carbon tetrachloride; Or degreasing with sodium hydroxide and cleaning with warm water. Then soak or wash with hydrochloric acid (mass fraction) 10- 15% and urotropine (mass fraction) 1% at 40-50℃ for 20-30 minutes, and then wash with warm water. Soak in ammonia solution with the mass fraction of 1% for cleaning 10- 15 minutes. After neutralization at 30-40℃, clean with steam or warm water. Finally, dry it with clean and dry air, coat it with antirust oil, and formally install it. (2) Cleaning, pressure testing and debugging of equipment: After the equipment is formally installed, it is best to clean it again to ensure reliability. The circulation time of dry oil and thin oil system is 8- 12 hours, and the pressure of thin oil is 5-3 MPa; Cleanliness is YBJ84.8G and h (similar to NAS 1 1 and 12). For the cleaned system, the pressure shall be kept at the rated pressure 10- 15 minutes for the test. Gradually increase the pressure and observe and deal with problems in time. After the test, read the pressure relay, temperature adjustment, liquid level adjustment and electrical interlock according to the design specifications, and then put them into use. (3) Equipment maintenance: On-site users must try their best to understand the information such as equipment, devices, parts drawings, manuals, etc., and technically grasp the relevant information of use, maintenance and repair, so as to be able to use, maintain and repair. The lubrication of oil film bearings is often manifested in the following three forms: (1) When starting or stopping, although there is lubricating oil between the shaft and the bearing, the hydrodynamic lubrication has not yet formed or gradually disappeared because the moving speed is equal to or close to zero, and the shaft and the bearing are bound to contact directly, and at this time they are in a state of boundary lubrication or even semi-dry friction. (2) During the operation of the rolling mill, mixed lubrication may occur due to vibration, excessive water inflow, insufficient oil supply or oil quality problems. (3) When the rolling mill runs normally and smoothly, it is lubricated by fluid. Therefore, the lubrication characteristics of oil film bearings are the alternating lubrication of the above three conditions. In order to meet the needs of high-speed, heavy-load, automation, large-scale and high-yield of iron and steel enterprises, to meet the lubrication requirements of rolling mill oil film bearings and to meet the increasingly harsh working conditions, oil film bearing oil-lubricating oil for rolling mill oil film bearings came into being.
Performance requirements of oil film bearing oil
The lubrication characteristics of oil film bearing of rolling mill determine that the oil film bearing oil must meet its performance requirements in order to ensure the normal operation and continuous production of rolling mill. Therefore, the oil film bearing oil should have: (1) excellent viscosity-temperature performance (high viscosity index), and can still realize normal lubrication of all lubricated parts when the bearing temperature changes greatly. (2) Excellent emulsification resistance (i.e. water separation), which can quickly separate water from oil after long-term use. (3) Good antiwear and extreme pressure performance. When oil is mixed with a small amount of water in operation, it can still form an oil film, maintaining heavy load and wear resistance. (4) Good anti-wear, anti-rust and anti-foaming performance to prevent the lubrication system from rusting, blocking the oil circuit, causing wear and insufficient oil supply. (5) Good oxidation stability, cleanness and filterability. Make the oil circuit of lubrication system smooth and ensure normal lubrication.
For more information about project/service/procurement bidding, and to improve the winning rate, please click on the bottom of official website Customer Service for free consultation:/#/? source=bdzd