SU706113A1 - Apparatus for fine grinding and separating materials - Google Patents

Description

(54) DEVICE FOR THIN SMOOTING AND MATERIAL SEPARATION

one

The invention relates to a device for fine grinding and separation of materials, preferably bulk materials, such as cement raw materials, in a roller mill connected with a separator for a duty cycle.

Machines for fine grinding are known, in which roller mills are used along with conventional pipe-ball and roller crushers. The grinding of materials in roller mills occurs between two horizontal rollers, similar to a roller crusher with series-connected separators in a cycle. Both rolls of the roller mill, however, have different diameters for obtaining good grinding conditions and, in order to avoid the formation of agglomerate, work with different peripheral speeds of the rolls. The grinding leaving the grinding gap of the rollers is directed to subsequent separation through transport routes, such as pipelines, troughs or draining trays, mechanically or pneumatically.

A device for fine grinding and separation of materials is known, comprising a roller mill, an air separator and cyclones 1.

Despite the fact that the use of a roller mill in grinding plants, compared with conventional pipe and ball mills and roller crushers, is more reflected in the use of energy (less energy), the marked slight increase in productivity is unsatisfactory. Roller mills, as well as pipe and ball mills and roller crushers in one, have the disadvantage that insufficient energy is used up. In particular, this relates to the kinetic energy of the ground material. This energy is additionally supplied, due to which the grinding from the mill is collected, then with additional energy consumption is loaded or fed into the separator. This

Claims (2)

the separator is required to feed the grinding already dosed and to provide the speed required for the separation process and, accordingly, the dispersion in the separation chamber. Also tpaHcrropTHpOBTKa pbmola from the mill immediately to the separator can be achieved only at the expense of additional energy consumption. The aim of the invention is to improve the performance of the device while reducing energy costs. For this, in the proposed device for fine grinding and separation of materials, the separator is made in the form of a tapered channel located directly under the rolls perpendicular to the flow of material coming out from under the rolls and connected by cyclone nozzles. Due to this embodiment of the roller mill and the cross-flow separator, direct loading of the mill material coming from the grinding gap of the roller mill directly into the separator chamber of the separator is achieved, while the rolls simultaneously perform the function of a separator loading device. This results in savings in material and energy for the loading device on the separator. The materials for the transport path between the roller mill and the separator and the energy for their work are also economized. As a result of reducing the consumption of materials and energy, the specific parameters of the entire installation of the roller mill are significantly improved. FIG. Figure 1 shows the proposed device, with the gas flows being shown by flat lines, and the material flows by dotted lines; in fig. 2 - driven rolls, option arrangement; in fig. 3 - driven rolls separated by chopping plates. The device contains a metering device 1, a roller mill with two rollers, more than 2 of which are driven by engine 3, and a smaller one is driven by a drive roller. 2. Directly under the rollers 2 and 4, a narrowing channel of the separator 6 with transverse blowing is disposed vertically to the flow of the grinding coming out of the grinding gap 5. This separator is connected by nozzles 7 and 8 to cyclones 9. The crushed material is loaded with a dosing device 1 in a thin layer into the grinding gap 5 between rollers 2 and 4. Rolled with an ambient speed of more than 10 m / s, the roller 2 is a grinding plate on which the rolls 4 work. The diameter of the rolls 4 is made in accordance with the maximum diameter of the zeria of the material to be ground. The width of the grinding gap 5 is set in accordance with the desired grinding results of the material and can be changed. To efficiently destroy the agglomerate formed during the loading process in the grinding gap 5, or rather to prevent the formation of agglomerate, auxiliary grinding means 10 are supplied. Already when using the natural moisture of the material, the hardness of the agglomerate is reduced. The crushed material leaves the gap 5 at a high speed and is thrown by the rolls 2 and 4 into the narrowing flow channel of the cross-flow separator 6. The material is divided by means of mounting sections 11 into different fractions of grain, more precisely, into finished grinding, going through nozzle 8, and into grains going through nozzle 7. Separation of individual fractions of grain occurs in cyclones 9. The coarse fraction is supplied by a cyclone through a mechanical or pneumatic conveyor 12 again in the roller mill. To efficiently dry the crushed material, the crossflow separator 6 can also operate on hot gas or hot exhaust gas 13. The chopping roll 4 is worn out due to its small diameter faster than the roll 2 of larger diameter. In order to avoid the frequent shutdown of a roller mill to change a crushed roll 4, which has failed, {see FIG. 2) four identical rolls 4 with parallel axes can be located in the rotary base 14 (star-shaped receiver). By rotating this base (in this case by 90 °), the grinding rolls are replaced in a few seconds. As a result, the grinding roller 4, which has failed due to wear, is replaced quickly and inexpensively. FIG. 3 shows an embodiment of the grinding rolls of a roller mill. In this case, the grinding plate of the drive roll 2 is divided by a bead 15 into several narrow grinding plates arranged one after the other. The width of these plates is oriented in this respect to the diameter of the chopping rolls 4. Each of these narrow grinding plates can be subordinated to one or several shafts 14, which are located in the rotary base 14. 4. Formula of the invention A device for fine grinding and separation of materials, comprising a roller mill, an air separator and cyclones, characterized in that, in order to increase productivity, the separator is made in the form of a narrowing channel located directly under the rolls perpendicular to the outgoing flow from-, under the rolls of material and connected by branch pipes with cyclones. / 3 Sources of information taken into account in the examination 1. USSR Author's Certificate No. 147422, cl. B 02 C 4/06, 1959.