For the operation of the coarse bar screen, many people feel that it is very difficult. The operation of the coarse bar screen has four requirements. Next, let me take everyone to find out.
When starting the coarse bar screen, pay attention to check whether there is any debris in the machine in advance. The drum part should be able to rotate lightly by hand, the gap between the blade and the screen drum meets the design size, the lubrication system has been filled with lubricating grease, the drive system and the rotation The direction meets the installation requirements (the drum should rotate clockwise when viewed from top to bottom). Then, open the sealing water valve and tail slurry valve, and close the slurry inlet pipe valve. Then open the dilution water door to fill the pressure screen with water. After the pressure screen of the coarse bar screen is filled, adjust the opening of the tail slurry pipe valve.
Maintaining a stable feed concentration and flow rate is an essential prerequisite for stable operation. The inlet pressure of the coarse bar screen is generally 0.1-0.4Mpa, and the operating pressure difference of the coarse bar screen is generally 0.01-0.04Mpa. There are two possibilities for cleaning the coarse bar screen: if the screen drum is blocked, the current of the drive motor increases, and the pressure of the good slurry drops. At this time, the good slurry pipe valve should be closed and the tail slurry pipe valve should be opened, and the slurry outlet should be closed. Add dilution water. When the pressure of the good slurry pipe is close to the slurry inlet pressure, it indicates that the blockage has been dredged. You can slowly open the good slurry pipe valve and close the tail slurry pipe valve to the original position; if the good slurry pipe pressure is still low, the slurry inlet pipe pressure is still high, which means that the blockage has not been eliminated. At this time, the pressure screen must stop running, open the upper benefit, lift the screen drum, rinse the screen drum with high-pressure water, and check the degree of wear of the screen drum.
Our first step is to stop supplying pulp to the coarse bar screen and pump in clean water. Then, open the sewage valve and heavy slag valve to empty the sewage and heavy slag. Then, let the water circulate in the coarse bar screen to dilute the slurry and clean out the screen. At this time, the good slurry pipe valve cannot be closed, otherwise, the liquid will flow from the good slurry pipe area to the slurry inlet area, and the screen will be blocked and cleaned to the coarse bar screen There is no fiber in it.
The main shaft bearings of the coarse bar screen are lubricated with grease. There are two oil cups on the front end of the frame. The upper and lower bearings are filled with oil twice a week, and the upper and lower bearings are filled with about 12 grams each time; the cover lifting device bearings of the coarse bar screen are filled with oil once a year; The tension of the triangle tape of the coarse bar screen must be checked frequently; always check whether the sealing water supply of the coarse bar screen is normal; to avoid the difficulty of restarting, the sieve drum must be carefully rinsed when the machine is shut down for a short time, and the sieve should be filled with water.
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