GSM (grams per square meter) is the metric system`s universal measure for paper weightand can be converted into lb. and pt.
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Several mill classification methods, the most practical method of classification is based on the different divided grinding media: the medium is a metal ball of a ball mill, a medium for the bar rod mill to be ground ore per se The medium is a self-grinding machine , and the ore or gravel is used as a medium for the gravel mill.
The mill can be divided into two types, cylindrical and conical, according to the shape of the cylinder. At present, the conical mill has been rarely manufactured in China, so in fact, the cylindrical mill is mainly manufactured, which includes a short cylindrical shape and a tubular shape. The ratio of the length to the diameter of the cylinder of the short cylindrical mill is less than 1, and the self-grinding mill belongs to this type; the ratio of the length of the cylinder to the diameter of the tubular mill (referred to as the tube mill) is greater than 2. Ordinary cement mills fall into this category.
According to the method of discharging, the grinding machine can be mainly divided into three types: 1 overflow type grinding machine: the grinding product is freely overflowed by the hollow journal of the discharge end; 2 lattice type grinding machine: the grinding product is located in the ore discharge After the pores of the lattice plate of the end are discharged, the pores flow out through the hollow journal; 3 Peripheral type grinding machine: the grinding product is discharged through the pores around the cylinder of the discharge end. In addition, there are open-type low-level discharge methods for rod mills and wind drainage methods for dry grinding.
According to the cylinder transmission mode, it can be divided into three types: peripheral gear transmission, friction transmission and central transmission (Fig. 1). The peripheral gear transmission method is the most widely used, and the central transmission is mostly used for the tube mill.
According to the support method of the cylinder, it can be divided into three types: bearing support, roller bearing, bearing and roller mixing support (Fig. 2). The bearing support mode is the most common, while the latter two are only used for the ball mill and gravel grinding. machine.
The grinding machine can also be divided into dry type and wet type according to the grinding production mode. At present, the wet type grinding machine is generally used in the ore dressing production, and the dry type grinding machine is rarely used.
The classification of the above conventional grinding machine is shown in Table 1. In addition, there are a variety of special grinding machines that have been greatly developed, such as high pressure roller mills, disc mills, vibrating mills, colloid mills, wrist mills, vertical cement mills, column mills. , generalized grinding, mixing mill, etc.
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Usually, the rod mill is used for rough grinding operations; the ball mill is used for fine grinding operations, but it is also often used for rough grinding operations; the self-grinding mill is also used in China's concentrating plants, and is generally used for grinding operations after ore crushing. The medium and fine crushing process can be omitted; the gravel mill is rarely used in the concentrating plant in China, and is generally used for fine grinding operations.
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