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vertical mill inspection and maintenance

As the main equipment of cement enterprises, vertical mill directly affects the efficiency of the enterprise, and its inspection and maintenance is very important. This article talks about the parts and methods of inspection and maintenance in combination with production practice.

First, the location and method of vertical grinding inspection


Vertical mill consists of its power, transmission, lubrication, powder selection, feeding pipeline, inlet and outlet ducts, sealing, discharge mechanism and mainframe. The system is huge and complex, and the inspection and maintenance tasks are heavy. It must be checked one by one and no dead ends. Briefly read as follows:

Power check


The power mainly refers to the main and auxiliary motors of the vertical mill. The contents of the inspection include whether the motor grounding is loose, and the problem is promptly tightened. Whether the position switch of the auxiliary motor is normal; whether the various types of shields are loose and friction; whether the motor vibration, noise, temperature rise, current, voltage, etc. are normal; whether the motor lubrication is normal, the oil pressure of the oil station, the oil supply temperature, the cooling water volume, and the Whether the outlet temperature is normal, whether the oil level of the oil station and the pressure difference of the oil filter are normal. If there is a problem, analyze the cause and symptomatic treatment.

2. Inspection and maintenance of transmission parts


The transmission section includes a coupling, a reducer and a petrol station that serves it. The inspection of the oil station part includes whether the oil level is lacking, whether the pressure is normal, whether the oil return, oil supply, fuel tank temperature is normal, whether there is oil leakage or oil leakage, and whether the oil passes through the oil pipe temperature, and whether the oil pressure difference is normal. Whether the cooling water volume and water temperature are normal, and whether the water temperature in and out of the cooler is normal. Also check the operation of the oil pump of the petrol station, such as vibration and noise. Regarding the coupling, it is mainly checked whether there is friction with the shield, whether there is a bolt break or other abnormal sound. The reducer is the focus of the inspection. It is necessary to hear whether the internal bearing and the gear meshing sound are even. It is necessary to test whether the vibration of each part is abnormal, whether the temperature of each detection point is normal, and whether the foot is loose. If an abnormality is found, it must be analyzed and processed. Here, the fault position can be determined by comparing the rotational speed of each shaft with the sound and vibration frequency. Check the oil supply pipe and the fuselage for oil leakage.

3. Grinding part of the grinding part of the inspection


Grinding parts include a pressurizing station, a grinding roll, a grinding disc and its support. The inspection of this part first checks whether the pressure station and its pipeline are normal, whether the accumulator is normal, whether the hydraulic cylinder has dripping oil, whether the hinge connection of the hydraulic cylinder is abnormal, whether there is abnormal noise or abnormal impact. Check whether the grinding roller support rotation is abnormal, whether the fastening bolt and the gland are loose, whether the lubrication of each joint bearing is in place, whether the hydraulic rod seal, the hydraulic rod connecting piece is abnormal, whether the grinding body and the back seal are damaged, whether the casing has grinding or not. Wear is not normal. Listen to the internal sound and vibration.

4. Inspection of the wind mill connecting pipe


The pipeline around the mill mainly refers to the inlet and outlet ducts, the feeding and discharging pipelines. This area mainly checks whether the connecting bolts of the inlet and outlet pipes are loose, whether the soft connection damages the air leakage, whether the inlet and outlet pipes are worn, and whether the feeding and discharging mechanism is flexible and effective.

5. Inspection of the classifier


The separator is located at the top of the mill. It mainly checks whether the motor, reducer and coupling work normally. Is there any abnormality, noise, vibration and temperature rise? Listen to the internal sound of the separator is normal, whether there is friction block phenomenon.

6. Each platform channel check


Because the vertical mill is very large, the platform and stairs are more, and it is related to the safety of personnel and equipment. The inspection of the department should not be underestimated. It should be one of the important contents of the inspection. The main inspection, the support of the platform, whether the connection points are invalid, whether the railing is reliable, whether the pedals are desoldered, whether there are obstacles affecting the passage on the platform, whether there are unstable objects, whether there is a safety platform for heavy objects, etc.

7. Other aspects of inspection


Check whether there is any obstacle in the air inlet of the sealed fan, whether the filter is blocked, whether the fan is running normally, whether the pipe and the joint are leaking.

Second, the maintenance of vertical mill.


The maintenance of the vertical mill mainly refers to the handling of the general faults that can be seen and heard during the inspection. mainly includes:

Adjustment of pressure and temperature of each petrol station; adjustment of cooling water flow and temperature; tightening of oil, water and gas pipe fittings to eliminate dripping; inspection of oil station when oil level is insufficient, timely replenishment; When the support is loose, carry out reliability treatment; when the equipment is found to have oil pollution or other pollution, clean it in time to ensure the equipment is hygienic; timely block the air leakage of the equipment to reduce reactive power consumption; when there is crisis equipment and personal safety around the equipment When it is unstable, it should be removed in time. Lubricate the lubrication pipes of joint bearings and hinge joints in time to ensure lubrication. When the anchor bolts or other connectors are found to be loose, they should be tightened in time. and many more.

Regarding the problem that must be stopped during the inspection, the cause should be analyzed, the location of the fault should be judged, the treatment plan should be formulated, and the relevant management personnel or management department should be reported to wait for the shutdown. For major problems found, as well as the safety or personal safety of the crisis equipment, emergency on-site disposal should be carried out, and then reported to the management department to develop maintenance plans, repairs, and help expand the accident.

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