Iron and steel metallurgical machinery lubrication characteristics

Lubrication iron and sintering equipment

Equipment such as coke and iron sintering machines, coke pushing machine, limestone and ore sintering equipment, large blowers, ore bucket tow rope and other equipment roof, cupola, blast furnace, belt conveyors, etc., most exposed to the air and dust, corrosive dust environment, vulnerable to corrosion, abrasive wear and cavitation. To slide oil-bearing wherein the corresponding bearings, gears, worm gear, hydraulic systems, wire rope should be lubricated. Coking coal powder machine due to frequent exposure to diffuse the air, which must be sealed lubrication, such as door switch and turn the end of the car and washout quench vehicles hydraulic system, generally use water - glycol fire-resistant hydraulic fluid ; belt conveyor shaft use lithium or calcium complex grease lubrication. Pushing machine indirect jobs, and the impact load, and coal dust in a high temperature environment, the need to use heat, water and good extreme pressure lithium grease or oxidation, rust and extreme pressure lubricants self-lubricating bearings sliding circulation lubrication hydraulic system must use fire-resistant hydraulic fluid. Gas purification and chemical by-product recovery portion machinery, due to dust and corrosive fumes, such as gas and therefore the carriage of machine lubricant should contain antioxidant rust turbine oil type, with filter and apply lubrication system. Limestone and ore sintering equipment, often work in dust and vibration and high temperatures, and thus to the use of composite calcium-based, lithium complex, aluminum complex grease or bentonite. Large-scale blast furnace, ore bucket hoisting rope and other top equipment generally can be 0 or 1, extreme pressure lithium grease, dry oil lubrication system, roof machinery available phosphate ester hydraulic fluid medium flame. Chartered iron large load, high temperature, required dropping point greater than 125 ℃ extreme pressure lithium grease lubrication.
Lubrication steelmaking equipment

Modern steelmaking furnace operation using computer control, high degree of automation, the equipment used require a corresponding lubrication systems and lubricants. Oxygen converter equipment, oxygen converter from the limiting rotary shaft support supporting rolling bearing molybdenum disulfide lithium grease lubrication, hydrostatic bearing pads and Teflon oil, grease lubrication can also be used. Converter drive gear load or heavy-duty industrial gear oil lubrication. The main ancillary equipment such as exhaust, motor, loading crane and crane lubrication points are many, all with the appropriate grease lubricated dry oil lubrication system, the drive gear common oil bath lubrication. Caster casting machine includes a turntable, bearing crane, and take ingot mold oscillator station like at a high temperature, generally with aluminum complex grease lubrication. Mold lubricant is used to prevent mold wear and adhesive lubricant. Even the casting of hydraulic medium usual water - glycol type or phosphate type medium.
Metallurgical equipment, oil

1) sintering equipment: tape machine: 150 Industrial gear oil; disc feeder: 150 Industrial gear oil; sintering machine slide elasticity: No. 1 aluminum complex grease; sintering machine smoke machine bearings: HL32 hydraulic oil; sintering machine car wheel bearing: aluminum complex grease; raw materials grab crane: 150 industrial gear oil; wheel bearing with a No. 2 lithium grease;

2) Domain equipment: Blast of BF Turbine: HL32 hydraulic oil; Electric Clay Gun Machine: gear with 320 industrial gear oil; mud fight orange silk and thrust bearings: No. 2 Lithium Grease; blast furnace hoist: 220 No industrial gear oils; feeding wire rope hoist: ZM wire rope grease; fabric roof and bell size rod seal centralized lubrication: after filtering waste oil; weighing car: Traveling axle bush with oil; air compressor: 100 No. reciprocating compressor oil;: 150 industrial gear oil; centralized lubrication system: 1 aluminum complex grease; hydraulic system: L-HL32 hydraulic oil; hot stove: valves with L-CKC100 industrial gear oils, departments open gear with semi-fluid lithium grease.

3) steelmaking equipment: open-hearth valve Worm: 460 Industrial gear oil; open-hearth furnace blower Rolling: 2nd Lithium Grease; metallurgy crane (ladle cranes, ingot cranes, crane off starter): ministries with 320,460 industrial gear oil, lubrication system No. 1 aluminum complex grease, wire rope wire rope grease ZM, open gears semi-fluid lithium grease, industrial gear oils worm with 320,460; Mixer: with 320,460 industry gear oil, lubrication system No. 1 aluminum complex grease; raw materials crane (magnetic crane, grab crane): 150 industrial gear oil, wheel bearing with a No. 2 lithium grease, wire rope wire rope grease ZM.

4) Rolling equipment: light oil system rolling line: 460 Industrial gear oil (medium and heavy loads); focus on the dry oil lubrication system: 1 aluminum complex grease; main motor bearing lubrication system: 32,46 wear hydraulic oil (oil film bearing oil); open gear: semi-fluid lithium grease. NOTE: industrial gear oil may be used L-CKB, L-CKC-type or L-CKC, L-CKD (heavy load) industrial enclosed gear oil.
Lubricating characteristics of the rolling mill

1, rolling equipment lubrication

(1) rolling mill: its main equipment includes rolling mill work base, universal joint shaft and balancing device, gear base, the main coupling ,, motor coupling and motor and front and rear winder, open-book machines .

(2) rolling mill lubrication requirements: dry oil lubrication, such as hot strip mill in the furnace input Kun Tao, Pusher, a feeder, Li Kun, base, rolling Kun Road, mill work Kun, mill pressure By means universal joint shaft and the frame, cut the first machine, looper, guides, output Kun Tao, rolled machine, coiling machine, washing machine, turned spindles, shears, cutting disc, broken machine, chop board so for oil lubrication; thin oil circulation lubrication, such as Baosteel 2030 five-stand tandem cold rolling mill, for example, the strip cooling and lubrication system and to the oil emulsion system uncoiler, five machines, feeding Kun, scroll scissors, guide Kun, Kun steering and winder, gear oils, mill and other equipment lubrication, oil film bearing of each rack systems; high-speed high-precision rolling bearings with oil mist lubrication and oil lubrication.

(3) rolling mill process lubrication cooling medium commonly used: in the rolling process, in order to reduce friction between the rolling Kun and rolled, rolling force and reduce power consumption, so easy to extend rolled, controlled rolling temperature increase quality rolled products, lubricating coolant must be added to the process rolling Kun and rolled between the contact surfaces.

The basic requirement for lubrication and cooling medium rolling mill process are: appropriate oily; good cooling capacity; good oxidation stability, rust and physical and chemical indicators of stability; good filtration properties; for rolling Kun and products with good surface rinse the cleaning effect; cold-rolled strip annealing performance good; do not harm human health; accessible oil sources, and low cost. Rolling mill process lubrication cooling medium variety, different rolled require different media; here briefly as follows: Rolled aluminum, aluminum foil, add kerosene additive for cooling and lubricating medium. 1700 WISCO cold rolling mill, rolling emulsion summer 45-50 ℃, winter 50-55 ℃, the mass fraction of 1.2 to 4.5 with the emulsion%, the highest mass fraction of 7%, 30% or more commonly used. Rolled strip higher concentration, lower concentration rolled thick belt. The use of emulsified oil inspection once every 8 hours PH value, the mass fraction of iron soap index, weekly comprehensive laboratory analysis.

2, using the rolling mill lubrication oil, grease

(1) rolling mill are often selected lubricants, grease: small and medium power gear reducer: LAN68, L-AN100 total loss oil system or load industrial gear oil; small rolling mill: L-AN100, L-AN150 total loss systems oil or load industrial gear oil; and the harsh conditions of high load gear, worm gear, sprocket: the heavy-duty industrial gear oil; live mill gear and pressure device, shearing machine, push the bed: rolling oil, in , heavy-duty industrial gear oil; rolling mill oil film bearing:; dry oil lubrication system, bearing oil film bearing: No. 1, No. 2 lithium grease or lithium complex grease; heavy machinery, rolling mill: No. 3, No. 4, No. 5 lithium grease or lithium complex grease; dry oil lubrication system, mill Kun said: calender fat (No. 1 for winter, summer for 2) or extreme pressure lithium grease, and heavy-duty industrial gear oil; dry oil lubrication system, gear boxes, couplings 1700 mill: lead calcium complex grease, medium, heavy-duty industrial gear oil. (2) rolling mill typical parts Lubrication selection: mill work Kun Kun Feng Jian and cooling systems with thin oil circulation lubrication (including sub-cooling and lubrication systems); rolling mill and supporting the work of Kun Kun bearings are generally dry oil lubrication, at high speed and with oil film bearing oil mist, oil lubrication; rolling mill gear frame ,, motor bearing, electric pressure reducer device, with thin oil circulation lubrication; rolling mill Kun Road, couplings, universal joint shaft and its balance mechanism, mill guide plane window friction dry oil lubrication.

3, commonly used rolling mill lubrication system Introduction

(1) light oil and dry oil lubrication system: a variety of rolling mill structure and lubrication requirements are very different, so in the rolling mill using different lubrication systems and methods. The sliding bearing simple structure, bearing and other parts and components can be used cup oil, dispersed oil ring monomers such as lubrication. The whole complex more important friction, is using a light oil or dry oil lubrication system. From the driving mode, the lubrication system can be divided into manual, semi-automatic and robotic systems into three categories, from line layout, etc. perspective can be divided into throttle, single-wire, two-wire, multi-line, progressive and other categories .

(2) rolling mill process lubrication system: according to the working conditions and the use of different media, mill process lubrication system pressure constant around 0.4-1.8MPa, per minute flow rate can be as large as several hundred to several thousand liters, media filtration accuracy of less than 5μm. Common nozzle segment and cooling medium is sprayed onto the apparatus and rolled rolling Kun, strict requirements for the discharge medium pressure, temperature and the like. Therefore, the discharge of the medium, oil (medium) by the hydraulic pressure temperature, a temperature control valve.

(3) rolling mill oil film bearing lubrication system: rolling mill oil film bearing lubrication system has a dynamic pressure system, static pressure system and static Hybrid system. Fluid friction conditions in the hydrodynamic bearing rolling Kun has some speed to form. When the rolling mill starting, braking or reversing, the speed change can not guarantee a liquid friction conditions, limiting the use of hydrodynamic bearings. Static pressure by the hydrostatic bearing float in the journal bearing, the high pressure oil film formation and speed has nothing to do, at the start, brake, reverse and even at rest, can guarantee a liquid friction condition, large carrying capacity, rigidity, and can meet any load, speed requirements, but require special high-pressure system, high cost. So, starting, braking, reversing, at low speed with a static system for high-pressure oil. High speed closed static system with a dynamic pressure of the oil supply system Hydrodynamic hybrid system is more ideal.

(4) Rolling oil mist lubrication and oil lubrication system: oil mist lubrication powered by compressed air so that the oil is atomized through a pipe, condensed into the mouth lubricated parts. For gears, worm, especially commonly used in large-scale, high-speed, heavy-duty lubrication of rolling bearings. It lubrication, cooling efficiency; and can save oil; there is a certain pressure due to oil mist (2-3KPa) can be anti-friction impurities and water immersion, the bearing life by 40%. Mist lubrication system includes a manifold air filter, solenoid valves, pressure regulators, oil mist generators, pipelines, condensation mouth, control instrumentation and so on. Oil mist generator is the core devices. Lubrication Oil mist lubrication effect is better than it is to rely on compressed air flow along the oil pipeline to the lubrication points. Oil lubrication system components, the key oil and gas mixer and distributor of oil and gas, the country has adopted a number of oil-air lubrication on imported equipment.

4, rolling mill commonly used lubricating device

Heavy machinery (including rolling mill and its auxiliary machinery and equipment) conventional lubrication system dry oil, light oil, oil mist lubrication device; domestic lubricated mechanical equipment has been basically sets can supply. Here is one of the major plant equipment lubrication, its name, its properties are as follows: heavy machinery standard thin oil lubrication device (JB / ZQ4586-86) This standard applies to metallurgy, heavy mining machinery and equipment light oil circulation lubrication system thin oil lubrication device, the working medium viscosity grade for industrial lubricants N22-N460, the circulating cooling installations out of the cooler. Nominal oil lubrication device is 0.63MPa; filtration precision low viscosity of 0.08mm; high viscosity of 0.12mm; cooling water temperature is less than or equal to 30 ℃ of industrial water; cooling water pressure is less than 0.4MPa; cooler into the oil temperature is 50 ℃, the lubricating oil temperature drop is greater than or equal to 8 ℃; steam pressure 0.2-0.4MPa. The main pressure lubrication components above range is 10MPa, 20MPa, 40MPa, which 20MPa, 40MPa is the introduction of foreign technology to produce products, from the Taiyuan lubrication plant and Shanghai lubrication plant production. Other products, in addition to the two, there are lubrication plant in Shenyang and Xi'an lubrication plant production. Thin oil system, four components are produced.

5, installation and maintenance of conventional rolling mill lubrication equipment

Installation (1) equipment: a careful review of piping drawings lubrication system, lubrication equipment and machinery to review the foundation drawings, confirm the connection, after installing the relationship correct installation. Before installation of the devices, elements to be checked; the product must have a certificate, it is necessary to check the cleaning equipment and components, and then pre-installed (on the more complex systems). After the pre-installation, pipe cleaning; check components and fittings, if lost, damaged, with qualified cleaning member additions. Cleaning method: carbon tetrachloride degreasing; skim or sodium hydroxide, wash with warm water. Then hydrochloric acid (mass fraction) 10-15% hexamine (mass fraction) of 1%, dipping or cleaning 20-30min, the solution temperature is 40-50 ℃, then wash with warm water. Then the mass fraction of 1% aqueous ammonia solution, dipping and cleaning 10-15min, after the solution temperature and 30-40 ℃, with steam or warm water. Finally, with clean dry air drying, coated with anti-rust oil, pending formal installation.

(2) cleaning equipment, pressure test, debug: the formal installation of the device, then rinse cycle once as well, to ensure reliable. Dry oil dilute the oil system and the cycle time is 8-12 hours, dilute the oil pressure 5-3MPa; cleanliness YBJ84.8G, H (similar to NAS11,12). After cleaning of the system should be based on the rated pressure dwell 10-15min test. Gradually boost, be observed in handling problems. After the test, according to the design specification read pressure switch, temperature regulation, level adjustment and punish conduct electrical interlock set-and then be put into use.

(3) maintenance of equipment: on-site users, we must strive to understand the equipment, devices, elements, drawings, brochures and other information, technically master the use, maintenance, repair of relevant information for maintenance and repair.

Oil film bearing lubrication, often show the following three forms:

(1) start or stop, even though there are between shaft and bearing lubricants, but the velocity is equal to zero or close to zero, hydrodynamic lubrication has not been formed or gradually disappear, shaft and bearing the inevitable direct contact, this time in the side-mediated lubrication even in semi friction state.

(2) rolling mill operations due to vibration or produce too much water or not enough oil or oil in question are likely to produce a mixed lubrication.

(3) when the mill is operating normally stable in fluid lubrication. Therefore, the lubricating oil film bearing characteristics are mixed lubrication alternately above three cases exist. Iron and steel enterprises to adapt to high-speed, heavy-duty, automation, large-scale and high-yield needs to address oil film bearing lubrication requirements, to meet the increasingly demanding working conditions, rolling mill oil film bearing lubricating oil - bearing oil film came into being.
Bearing oil film performance requirements

Lubricating oil film bearing characteristics, determines the bearing oil film must meet performance requirements before they guarantee the normal operation of the rolling mill and continuous production, therefore, need to have the oil film bearing:

(1) excellent viscosity-temperature properties (high viscosity index) when significant changes in the bearing temperature, can still achieve the normal lubrication of the various parts of the lubrication.

(2) superior anti-emulsifying properties (ie, water points), long-term use can quickly separate the oil in the water.

(3) good anti-wear and extreme pressure properties, when mixed with a small amount of water running in oil, form a film still holds the reload and abrasion resistance.

(4) good anti-wear, anti-rust, anti-foam properties prevent lubrication system from corrosion, clogging oil shortage caused by the wear and oil.

(5) good oxidation stability, cleaning ability and filtration. Lubricating oil flow system, to ensure the normal lubrication.