Spot inspection, lubrication and maintenance of main equipment on furnace top
1. What are the main equipment of the furnace top?
The furnace top equipment is mainly composed of airtight box, distribution chute, material tank, valve box, upper and lower dense, one level, two level, uniform release, cyclone dust removal, flap chute and other parts.
2. Write out the precautions for the operation of the airtight box.
1) The gearbox should operate within the normal range, and should not be overloaded.
2) The normal working temperature of the gearbox is below 50℃. When the temperature of the gearbox is as high as 70℃ for some reason, the working time cannot exceed half an hour.
3) The cooling gas pressure (nitrogen) of the transmission gear box should always be kept higher than the top pressure of 0.05MPa and continuously supplied without interruption. The high pressure of the cooling gas is 0.7MPa.
4) If the β angle does not turn, it should be dealt with in time. If the material needs to be discharged, it should not exceed 3 batches.
5) If the α angle does not turn, it should be dealt with in time. If it is necessary to discharge the material, it should not exceed 8 hours.
6) When the temperature of the furnace top exceeds 350℃, water should be drawn in time to cool down.
7) Ensure the continuous supply of cooling water for the gearbox. If the water is cut off in special circumstances, the time should not exceed half an hour, and the cooling nitrogen pressure should be increased in time and the flow rate should be increased. Close the lower density and material flow control valves, and stop β.
3. Operational requirements of the post during maintenance
1) When debugging or overhauling, the post worker starts and stops the equipment through the operation box next to the machine. Switch back to automatic after debugging;
2) In the event of an accident, pull the emergency stop switch beside the engine and notify the main control room;
3) When the accident handling is over, notify the main control room and point the "selector switch" to the "automatic" position.
4. Reasons and treatment methods for the high temperature of the airtight box?
1) The amount of nitrogen is too low and the temperature of nitrogen is high.
2) Insufficient cooling water pressure and flow.
3) The top temperature is high.
4) The thermal insulation coating on the lower layer of the airtight box is removed.
5) Treatment method: increase the amount of nitrogen, increase the flow of cooling water for cooling, and pump water to cool down.
5. Troubleshooting methods for the proximity switches of each valve on the furnace top.
1) First notify the blast furnace foreman and relevant personnel to deal with it.
2) When dealing with faults, follow the instructions of special personnel.
3) In the case of ensuring the whole, you can temporarily listen to the command of a special person to short-circuit the signal to maintain the feeding, and return to normal after the fault is resolved
6. How to prevent the occurrence of wrong materials?
1) Adhere to the system of comparing angles, checking materials, matching materials, and asking for errors. The types of materials to be obtained and various data settings are set, and the settings are confirmed.
2) When loading fabrics, carefully monitor the operation of the equipment and the progress of the program, especially the angle and the number of turns, and correct the problems in time.
7. The fault judgment of the oil cylinder not moving.
1) The solenoid valve must not be powered and not reversed.
2) The cylinder piston falls off.
3) Mechanical jamming, blockage of oil circuit.
8. What are the ways to count the number of cloth circles?
1) Collect the signal of the closing point of the master controller, and count one circle per revolution of 3600.
2) Use time to accumulate laps.
9. How to deal with the failure of one equalizing voltage?
1) If the first one is in the off position, on the one hand, notify the relevant unit to deal with it, and on the other hand, use the second equalizer to discharge the material.
2) One is in the open position, the first is to contact for treatment as soon as possible, the other is to stop the charging, the third person will give a close signal, manually close the butterfly valve of the first, and resume the discharge of the second equalizer.
3) If the valve body of Yijun is faulty, close the 77m butterfly valve (the Yijun pipeline) and close the Yijun glasses valve, and then handle the fault.
10. What are the factors of buried ruler?
1) When the buoy is working, pipes or broken materials appear in the furnace.
2) When the air is exhausted, the ruler is not stopped in time.
3) If the ruler is not lifted or the operation fails during operation, the power will be cut off in the middle.
11. Precautions for all kinds of wind break and air supply gas replacement.
1) Operate according to the program, do not advance or delay or reverse the order.
2) The various valves that open and close should be in place, and the detection part should be tested for gas.
12. Treatment of the material in the tank.
1) Close all the valves of the material tank, open the first and second pressure equalization, open the material flow valve in the open position, and move the lower sealing valve back and forth.
2) It can be opened and released for a short period of time, and the pressure in the furnace can be used to blow back the charge to loosen the charge in the tank.
3) You can contact the foreman to change the gas cutting from reduced pressure to normal pressure operation.
4) If the above three items do not work, wait for the iron to stop the wind, open the manhole of the discharge hopper, and manually poke the material.
13. State the common methods of motor inspection.
1) Touch by hand: whether the temperature of the machine is normal, and whether the anchor bolts of the back wheel motor are loose.
2) See: whether the slip ring of the motor is on fire, whether the current is normal, and whether the bolts of each part are short.
3) Hearing: whether there is any noise in the motor.
14. What are the commonly used inspection methods for oil cylinders?
1) See: whether the cylinder rod is carrying oil, whether the static seal of the front and rear chambers leaks oil, whether the cylinder rod and the earring interface are tripped or open welding, whether the pin shaft pin is falling off.
2) Listening by ear: When the cylinder moves, if there is air sound, it means that there is air in the cylinder or the cylinder is leaking.
15. Faults and treatment methods of air-tight box water cooling equipment.
1) The amount of circulating water decreases and the temperature of the airtight box rises. Check whether the pipeline equipment is leaking and whether the water pump is working normally. If any abnormality is found, turn the pump down in time.
2) Whether the back-cleaning filter is working properly, whether the two drain valves are closed in place, and whether the water volume is controlled to a normal value.
3) The temperature difference of circulating water increases, and the effect of water/water heat exchanger is not good. Clean the heat exchanger and replace the circulating water to reduce the inlet water temperature.
16. How to deal with the water stop of the airtight box:
1) When the water in the airtight box is stopped, immediately notify the relevant personnel to check and deal with it.
2) Maximize the amount of N2 entering the airtight box.
3) Pay close attention to the temperature of the transmission airtight box and try to control the lower furnace top temperature.
4) When the temperature of the airtight box reaches 700C, it cannot exceed half an hour.
5) When the airtight box is higher than 900C, the chute should be stopped, the chute should be placed in a vertical state, and the wind should be stopped as soon as possible.