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Cement Raw Mill Grinding Mesh

Cement Raw Mill Grinding Mesh

Cement Raw Mill Heating Point Cooling Case

The Cement Raw Mill differs from the original one due to the grinding material. The Cement Raw Mill is generally high in temperature due to the clinker (especially in summer). The hot spot is the grinding head bearing and the main reducer bearing bush; the hot air of the kiln tail humidifying tower is used as the drying heat source, and the heating point is slippery. Bearing bush and main reducer bearing bush. In response to the above heating points, we have adopted different cooling measures, and received good results, improving the operating temperature of the Cement Raw Mill and the original spindle in the summer.

Cooling Of The Hot Spot Of The Cement Raw Mill

The Cement Raw Mill model equipped by our factory is Ф4m×13m ball mill, power 2800kW, adopts center drive, main reducer JS140-A, its thin oil station model is XYZ-350, heat exchange area is 21m2; Cement Raw Mill main The model of the thin oil station equipped with the bearing oil station is XGO-A2.5/40, and the heat exchange area is 5m2. In summer, due to the influence of external temperature, the temperature of the grinding spindle and the bearing speed of the main reducer are often around 60-62 °C, and the normal temperature range normally controlled is <60 °C .

Such high temperatures pose a hidden danger to the normal production of Cement Raw Mills. To this end, we have taken measures to increase the cooling area of ​​the thin oil station (that is, the different types of tube-type coolers on the string) to achieve effective control of the temperature of the grinding spindle and the bearing temperature of the main reducer.

Cooling Improvement Measures

Next to the Cement Raw Mill main reducer thin oil station and the grinding tail spindle tile oil station cooler, one column tube cooler is connected in series. The technical parameters are shown in Table 1, and the installation arrangement is shown in Figure 1. In order to achieve effective control, a plurality of valves are designed to achieve temperature control of different seasons and different heating temperatures. Namely: the outside temperature is low in winter, the valves 1, 2, 3, 4 are closed. The lubricating oil in the thin oil station does not need a cooler, and the valves 5 and 6 are directly connected to the lubrication point; in summer, the external temperature is high, and the valve is closed. 6, the lubricant needs to be fully cooled by two coolers (ie, valves 1, 2, 3, 4 open); spring and autumn temperatures are more suitable, only one cooler (close the valve 5, 3, 4, only open the valve 1 2, 6) will meet the requirements.

Improved Effect

Since the cooling device of the Cement Raw Mill thin oil station has been improved in series since 2004, the temperature control of the hot spot is relatively easy. Even in the hot summer, the heating temperature of each lubrication point is below the safe value. The JS140-A reducer for Cement Raw Mill has two bearings, 10 bearing bushes, 12 temperature measuring points, and the grinding tail spindle has two temperature measuring points; the temperature comparison before and after the improvement is as follows:

Cooling Of The Original Hot Spot

Our factory used the original Ф 4.6m × (3 + 10) m drying and unloading, the middle with the sliding support, the main reducer model used is JS150-B, the center drive, power 3550kW. For the hot sliding bearing bush and the main reducer bearing bush, we adopted the air-cooled sliding shoe and the water-cooled thin oil station, which also achieved the purpose of cooling.

Cooling Of The Original Sliding Bearing Bush

With compressed air, the inner surface of the air-cooled shoe can effectively reduce the temperature of the sliding bearing bush. The air-cooling device is shown in Figure 2. It is welded to a “C” frame with a 25 mm steel tube and attached to the outer seal of the shoe.

The “C” frame is wrapped around the outer edge of the Cement Raw Mill barrel. At the two ends of the frame, along the inner width of the shoe, there are four small holes of Ф8 mm, and the positions of the small holes are directly opposite the shoes. One end of the frame is connected to the compressed air duct and is provided with a valve to control the air volume.

When the original sliding temperature reaches 60 °C, the valve is opened to cool the shoe, and the opening degree of the valve is adjusted to an appropriate level according to the temperature of the sliding bearing bush. In the hot summer, the device can be kept open, so that the maximum temperature measurement point of the shoe is controlled at 55-57 °C.

Cooling Of The Original Main Reducer Bearing Bush

The original main reducer JS150-B has a large body and a large heat dissipation area. The main reducer is in operation, only the individual bearing bushes have a high temperature phenomenon, and for the cooling thereof, a water-cooled thin oil station is adopted.

Cooling Measures For Main Reducer Bush

Use the heating hole of the XPZ-400P thin oil station to cool down. The heating device equipped with the thin oil station is very characteristic and belongs to a sheathed heating device. The heating wire of the heater is in a closed sleeve and is not in direct contact with the lubricating oil. We used this special device to remove the heater and then make the water inlet and outlet pipes (see Figure 3b) for water cooling. Among them, the length of the inlet pipe is longer, 50 mm from the bottom edge of the sleeve, and the outlet pipe is designed to be shorter, and the length is controlled to 100 mm. The inlet pipe and the outlet pipe are welded to the flange at the same time. The size of the flange is the same as that of the heater. It is fastened with 6 M6×30 mm hexagon socket bolts. Before tightening the bolt, pad the bottom of the flange. A 2 mm rubber pad is provided to prevent the flange from leaking. Finally, the water pipes are connected by a rubber tube, and the joint of the rubber tube is fastened with a wire.

Precautions

It should be noted that the original design of the thin oil station pipelines are all seamless steel tubes, flange joints, argon arc welding, so that no leakage. However, for safety reasons, the water pressure test of the heater jacket should be carried out before the water cooling, and the water pressure test at 0.4 MPa should not have water seepage. After the cooling water is passed, the water pressure is controlled to be less than 0.2 MPa. In winter, the heating device should be restored, and the sheath should be air-dried before recovery. After the inner hole of the sheath is dried, the heating wire is fastened.

Water Cooling Effect

The thin oil station has 6 juxtaposed HRY sheathed electric heaters. The jacket size is Ф110mm×1200mm. After changing to a water cooling device, it is equivalent to adding a surface area of 2.54 m2 to the inside of the thin oil station. Device. In the summer of 2005, we first tested on the #1 line, and the cooling effect was very obvious. In the summer of 2006, we extended it to the #2 line. The original main reducer is the same as the main reducer of the Cement Raw Mill. There are two bearings, 10 bushes and 12 temperature measuring points. The temperature of each bearing of the main reducer before and after the improvement is as follows.

The cooling of the Cement Raw Mill and the original lubrication hot spot is very important in the production. If the cooling measures are not timely, it will not only affect the normal operation of the Cement Raw Mill, but also may cause a burnt tile accident.

Summer is the peak season of production and sales. The Cement Raw Mill has a high operating rate. The supply of cement is in short supply, and the cooling of the main shaft is very important. Our measures of using a series cooler are more appropriate, and the investment is only about 20,000 yuan. Compared with the Cement Raw Mill, the original operating rate is lower, and the temperature of the grinding material is not high. The air cooling and water cooling oil station can meet the cooling requirements. Of course, it is also possible to use a series cooler to cool down.

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