The discharge grate plate of the ball mill directly affects the grinding effect of the ball mill, but the current discharge grate plate is often seriously blocked, which leads to problems such as smaller ventilation area, poor ventilation and over grinding of the ball mill, affecting the normal operation of the ball mill. Therefore, Fodamon engineer optimized and transformed the discharge grate plate of the ball mill, The quality and operation effect of the discharge grate plate of the ball mill are greatly improved.
1、 Problems of discharge grate plate of ball mill
The discharge grate plate of the ball mill is an important guarantee for the grinding efficiency of the ball mill. It can discharge the materials in the mill in time without affecting the residence time of the materials in the mill. At the same time, it can also improve the ventilation capacity of the ball mill, reduce the temperature in the mill and improve the grinding efficiency. However, there are often some problems in the discharge grate plate of the ball mill. For example, the grate joint of the discharge grate plate is often blocked by materials, resulting in the reduction of material passing and ventilation area in the mill, and even the materials are forced to be discharged from the central hole, which intensifies the ventilation resistance.
Due to the limited diameter of the central hole, when the output of the mill is high, the discharge at the central hole can not meet the output requirements of the mill. Too much material in the mill leads to the reduction of grinding efficiency, poor ventilation, easy full grinding of the mill, dust emission or return of the grinding head, so it is forced to reduce the output and operation. At the same time, after the grate plate is blocked, the ventilation in the mill basically passes through the central hole. At this time, the wind speed at the central hole is large, forming the central wind tunnel effect, resulting in the consequence that the grinding fineness is easy to coarsen, which seriously restricts the production capacity of the mill. Especially in the peak season of cement shipment, the operation rate of the mill is high, the increase of the hourly output of the mill is limited, and in serious cases, the whole fine grinding bin of the mill is full of grinding, The whole grate plate out of the mill was stuck and forced to shut down to clean the grate joint, which seriously affected the cement production.
2、 Measures to solve the blockage of discharge grate plate
Regularly clean the grate joint of the discharge grate plate of the ball mill; Select the grinding body with good quality. Because the main reasons for the blockage of the grate joint of the discharge grate are broken abrasive bodies and coarse-grained materials that are difficult to grind, it is necessary to select abrasive bodies with better quality to reduce the blockage of the grate; Regularly clean the grinding body in the grinding bin and remove the small and broken grinding body; The discharge grate plate is optimized. The shape of grate gap and broken grinding body are reasonably optimized.
3、 Structural transformation of discharge grate plate of ball mill
The above measures to solve the blockage of the discharge grate plate can only alleviate the blockage of the discharge grate plate and prolong the cleaning cycle of the discharge grate plate, but can not fundamentally solve the problem. Therefore, the structure of the discharge grate plate of the ball mill needs to be reformed. By using the existing materials to make the anti clogging grate plate, the influence of clogging is reduced, the ventilation area of grinding tail is increased, and the problem of full grinding is solved. See Fig. 2 for the structure of grinding tail grate plate before and after transformation.
The specific transformation scheme is as follows: because the blockage of the grate joint mainly occurs in the middle ring and outer ring, this time is to improve the structure of the grate plate of the middle ring and outer ring of the mill tail. According to the original grate joint width of about 10mm, it is determined that the wear-resistant screen gap is 5mm wide and 3mm thick, made of stainless steel through punching, which has the function of flat, smooth and wear-resistant screen surface. According to the size of the existing grate plate, screw holes with the same specification as the grate plate are made to facilitate installation, and then the ribs on the existing grate plate are selectively cut off by gas cutting. On average, 12 ribs are cut off on each lining plate, which will not have a great impact on the strength of the overall lining plate. Attach the cut screen to the discharge end of the grate plate, adjust the grate plate and screen, and fasten them well with bolts. The wear-resistant screen is attached behind the grate plate. In actual operation, it is only close to the grate plate surface of the steel ball to cause friction with the steel ball, and will not cause great wear to the internal screen. The structure can meet the requirements of various grate joint forms.
Through the transformation of the discharge grate plate of the ball mill, Fodamon machinery completely solves the blocking problem of the discharge grate plate, increases the ventilation area, ensures the long-term stable operation of the ball mill and improves the working efficiency of the ball mill.