Thread Content
1. The five key steps for equipment inspection are: listen, touch, check, observe, smell. 2. The five principles of lubrication management are: fixed location, fixed quality, fixed quantity, fixed frequency, and fixed person in charge； Three filters: from the large oil container to the oil storage tank, from the oil storage tank to the oil bottle, and from the oil bottle to the lubrication points. 3. The four aspects of understanding in equipment management: understanding the principles, understanding the structure, understanding the performance, and understanding the manufacturing process ； Three skills: know how to operate, know how to maintain, and know how to troubleshoot faults. 5. What are the proper maintenance methods for pressure vessels? Maintain the corrosion resistance of pressure vessels to prevent corrosion by the medium and the atmosphere; ensure that safety accessories are calibrated as required and remain complete, sensitive, and accurate. Fixing elements must be intact and reliable, and any leaks or drips must be promptly addressed to reduce and eliminate vibrations in the vessels. 6. Functions of lubricants: cooling, cleaning, sealing, rust prevention, vibration damping, transmission, and lubrication. 7. Share your views on the significance and importance of controlling leaks: Leaks affect the appearance of the factory, hinder production, and pose obstacles to the certification of leak-free facilities. Chemical production involves substances that are flammable, explosive, and toxic; leaks can harm human health, cause unnecessary losses in production, and even lead to injuries or deaths among workers, as well as severe consequences. 8. Common faults and their causes of rolling bearings: 1. Bearing overheating: (1) Insufficient lubricant supply or incorrect lubricant selection; (2) Presence of foreign particles; (3) Incorrect installation ； 2. Abnormal sound: (1) Spalling or damage to the bearing raceways; (2) Loose brackets; (3) Severe lack of oil in the bearing; (4) Pitting on the raceways and steel balls ； 3. Inflexible transmission: (1) Loose or faulty seals and other accessories attached to the bearings; (2) Bearings stuck due to oil or dirt; (3) Poor fit between the inner and outer rings of the bearings and the bearing housing, either too loose or too tight. 9. The main reasons why a centrifugal pump does not deliver fluid are: (1) Excessively high temperature of the medium, resulting in cavitation; (2) Blockage at the suction inlet; (3) Air leakage from the pump body and seals; (4) Loose impeller nuts, wear of the impeller and shaft key, with the key no longer functioning properly; (5) Severe erosion of the impeller blades; (6) The motor rotating in the reverse direction; (7) The pump being empty of fluid; (8) Air remaining in the pump, preventing the creation of a vacuum. 10. Describe the working principle of a gear oil pump: When the pump starts, the driving gear drives the driven gear, which rotates in the opposite direction. There is good meshing between the gears; the teeth of these gears scrape some of the oil at the inlet, creating a low pressure that draws liquid into the pump. The liquid then splits into two streams, and as it moves through the gap between the gears and the pump casing, it is pushed forward by the gears and sent to the discharge port, where high pressure is generated to expel the liquid. 11. The main equipment of a blast furnace recovery boiler includes: the combustion furnace, steam superheater, boiler body, second air preheater, soft water heater, first air preheater, exhaust fan, and supply fan. 12. Reasons for slippage of the furnace rod machine: (1) Damaged drive bearing, severely worn brake pads; (2) Severe lack of oil in the furnace rod machine, resulting in severe wear of various components; (3) Scarring on the furnace, displacement of the ash tray ； (4) The chain is too long, and the sprockets are severely worn. (5) The pyramid spring is not properly compressed, etc. 13. Causes of oil pressure fluctuations: (1) Excessively high oil temperature, inappropriate oil type for the season; (2) Severe wear of the oil pump; (3) Severe wear of the relief valve; (4) Damaged seals in the cylinders, resulting in oil leakage; (5) Severe wear of the solenoid valve, leading to oil leakage; (6) Dirty oil with water mixed in it; (7) Insufficient pressure in the accumulator; (8) Low power of the oil pump, resulting in insufficient flow rate; (9) Insufficient storage capacity in the system; (10) Oil leakage from the system; (11) Uneven matching of the cylinders in the system; (12) Dirty filters, resulting in poor oil suction capacity, etc. 14. Reasons for loud noise in rotary vane blowers: (1) High outlet pressure and heavy load; (2) Faults in motor components; (3) Severe tar buildup inside the blower; (4) Lack of oil; (5) Water entering the blower; (6) Severe bearing wear and poor gear meshing; (7) Loose bolts on some components; (8) The check valve not being properly closed, etc. 16. The structure of the gas generation hydraulic valve in our factory includes a valve body, valve cover, valve plate, valve stem, upper and lower expansion elements, packing gland, cross brace, connecting rod, and cylinder, etc. Reasons for poor takeoff and landing performance: ① Low and unstable oil pressure ； ②Internal components of the valve have fallen off or become stuck ； ③The gland is too tight ； ④The hydraulic valve is severely worn ； ⑤The cylinder seal is damaged ； ⑥The valve stem lacks proper lubrication ； ⑦The valve body is not installed properly; the cylinder and hydraulic valve are not perpendicular or aligned correctly. 17. What types of hydraulic oil should be used for gas generation in winter and summer? Use 46#–68# anti-wear hydraulic oil in winter, and 68#–100# anti-wear hydraulic oil in summer. 18. What are the requirements for installing operating equipment? First, ensure levelness; second, ensure alignment; third, conduct a verification. For high-speed equipment, the concentricity tolerance is ±0.06 mm, while for general equipment it is ±0.12 mm. 19. Bearings are commonly divided into rolling and sliding types. 20. Components of a solenoid valve: valve body, coil, spool, front and rear gland plates, front and rear gaskets, spring, coil sleeve, front and rear spool guide shafts, etc. 21. Components of an electric hoist: lifting motor and distribution box, drum, rigid coupling for the connecting shaft, gearbox assembly, trolley assembly, driving motor, etc. 22. Reasons for slippage in electric hoists: 1. Loose motor brakes, worn motor splines, worn connection shafts and splines, inappropriate length of the splines, and severe wear on gearbox components can all cause slippage when the electric hoist is lifting loads. 23. Maintenance procedures for Roots blowers: ① Regularly check whether there is lubricant in the lubrication parts and whether the oil level in the oil tank is at the proper level. ② Regularly monitor the temperatures of various components; the temperature of the bearings should not exceed 80°C, while the temperature of the drive gears should not exceed 60°C℃ ； ③After 48 hours of use following a major machine overhaul, all the oil in the tank should be replaced with the specified lubricant; thereafter, the oil should be changed every 500 hours of operation. ④After shutting down the gas transmission system, steam should be used to flush out coal tar and other debris, in order to prevent them from adhering to the rotor and thereby disrupting its balance. ⑤During operation, pay attention to whether there are any abnormal frictional or impact noises from the fan. Any faults that occur during operation must be addressed properly; it is strictly prohibited to keep the machine running despite such issues. 24. Common problems with high-inclination belts and flat belts: The typical faults associated with these two types of belts are belt misalignment and severe wear. In the case of high-inclination belts, adjustment is carried out through the combination of guide rollers and tensioning wires; for flat belts, adjustment is done using the tensioning wires on the rear rollers – usually, if the left side needs to be loosened, it is loosened on the left side, and similarly for the right side. Fine adjustments should be made rather than large ones, and it is necessary to observe until the belt is operating properly before leaving. Furthermore, damaged bearings or faulty idler bearings can prevent the belt from functioning properly; those in charge of the equipment must conduct regular inspections, detect problems promptly, and address them quickly to ensure normal operation. 25. The requirements for a “leak-free factory” stipulate that the integrity rate of major equipment should be 95%, while that of all equipment should be 90%. The leakage rate at static sealing points must be below 0.5‰, and the leakage rate at dynamic sealing points must be below 2‰; in addition, there should be no significant deviations. 26. The wear and tear of equipment can be divided into tangible wear and intangible wear. 27. The five integrations in the comprehensive management of equipment include: the integration of design, manufacturing, and use; the integration of maintenance and planned repairs; the integration of repair and renovation with upgrading; and the integration of professional management and technical management. 28. The main functions of lubricants: in addition to lubrication, they also serve to cool, clean, seal, prevent rust, absorb shocks, and transmit forces. 29. A rolling bearing of model 3616, with an inner diameter of 80 mm. 30. A valve of model J11H-16-25 has a diameter of 25 mm and an operating pressure of 1.6 Mpa.