SU691194A1 - Method for automatically controlling the loading of a drum mill - Google Patents

Description

(54) AUTOMATIC REGULATION DOWNLOADS FOR LOADING A CELEBRATED MILL;

The invention relates to methods for automatically controlling the process of fine grinding materials and can be used to automatically control the grinding process in drum milling machines and ball mills for dry and wet grinding methods in the cement and other industries.

A known method for automatically controlling the operation of a drum mill, including a change in the feed of the material to the mill, depends on the degree of filling of the mill drum or on the fineness of the output product. The disadvantage of this method is that it does not take into account changes in the level of material in the feed chute 1.

Another method is known for automatically controlling the loading of a drum mill, which includes changing the material feed to the mill depending on the filling level of the mill drum and measuring the level of material in the loading chute 2J.

This method is closer to the described invention, however, it has insufficient speed, as a result of which the time to bring the mill to the optimum mode is large and emergency situations can occur.

The aim of the invention is to reduce the time for bringing the mill to the optimum mode and to prevent the occurrence of emergency situations.

This is achieved by automatically adjusting the load of the drum mill, including changing the material feed to the mill depending on the degree of filling of the drum of the mill and measuring the material level in the loading furnace, additionally sets the minimum and maximum allowable values of the material level in the loading furnace. and minimum and maximum

0 allowable material consumption in the mill, then compare the material level in the loading flow with the minimum allowable value, and when the material level in the loading flow decreases below the minimum allowable, the maximum allowable material flow rate in the mill is set, and if the material level in the load estrus is Btjuie

0

the minimum permissible value is then compared with the maximum permissible value, and when the maximum permissible level value is exceeded, the minimum permissible amount of material flow to the mill is set, and the change in material feed to the mill depending on the drum filling is made at the level of the material in the feed flow below the maximum allowable value.

The drawing shows a block diagram of an adjustment system for implementing this method.

The system for controlling the loading of the drum mill 1 contains a sensor 2 for the degree of filling of the drum of the mill 1. As sensor 2, you can use a power sensor consumed by the drive motor, an electroacoustic signal sensor, a pressure sensor for lubricant in bearings. Instead of sensor 2, the fineness of grinding of the exiting product should be used. The system also contains a regulator 3, a switching device 4, a sensor for the layer of material in the loading chamber 5, for example, a gamma relay 6 of the minimum allowable material level and a gamma relay 7 of the maximum allowable material level ,

The method is carried out as follows.

The degree of filling of the drum of mill 1 is measured by sensor 2, the signal from the output of which is fed to the input of controller 3. A regulating effect is obtained at the output of regulator 3, which varies depending on the degree of filling of the drum of mill 1, the regulating effect from regulator 3 is supplied to one of the inputs of the switching device 4; Minimum and maximum allowable levels of material in the loading estrus 5 are controlled using a gamma relay 6 and 7; When the level of the material in the loading estrus drops below the minimum allowable the gamma relay 6 is activated, according to the signal of which, at the output of the switching device 4, a control is generated to the action and fed to the input of the actuator 8 with which the maximum speed of the drive 9 of the feeder 10 is set. When the material level in the loading chute is exceeded, 7, on the signal of which at the output of the switching device 4 a control action is generated and to the input of the executive mechanism 8, with the help of which the minimum acceptable and the speed of the drive 9 of the feeder 10, If the level of the material in the loading chute; 5 is within acceptable limits, then with the help of a switching device 4, a regulating action is supplied from the output of the regulator 3 to the input of the actuator 8 and the speed at the input 9 of the feeder 10 varies depending on the degree of filling of the mill.

Q Thus, if the material level in the feed chute is below the minimum allowable, which corresponds to an underloaded mill, the maximum allowable flow rate is set

from the material to the mill; if ur material is ravaged in the feed chute, above the maximum allowed, which corresponds to the overloaded mill, the minimum allowable setting is ... -.the flow of material into the mill. This makes it possible to shorten the time to bring the m4 into the optimum mode and prevent the occurrence of emergency situations.

If the material level in the load flow is within acceptable limits, then the material flow to the mill is changed depending on the degree of filling.

Claims (1)

1. USSR author's certificate  50738G5, according to cl. B 02 C 25/00, 1973. 2, USSR Author's Certificate No. 532393 for cells, B 02 C 25/00, 1974 (prototype), k