SU575129A1 - Automatic regulation system of mill loading - Google Patents

Description

The drawing shows a block diagram of a proposed system for automatically controlling the loading of the mill.

The system contains the source material feeder 1, mechanically connected with the executing mechanism 2, feeding the transport 3, weight controller 4, reference element 5c second signal divider 6, weight setter 7, weight sensor 8, mill 9, sensor 10, and setting unit 11 mill load levels, reference element 12, feed control 13, first signal divider 14, bpok overflow signal overload 15 amig power discriminator 16 and key for penalty 17.15

When preparing the system for operation, the weight unit 7 is set to the position corresponding to the production of the aground with the worst quality of the original material, and the generator 11 will be loaded into the application corresponding to the optimal loading of the mill

In the work, with the quality of the material being consumed and the load level of meats 1, 9, equal to Daria, at the output of the load control regulator 13 cHTHaiii is equal to the work. Prv ggom on the element sravie «5 with povazp5votg; two signals: the signal of the setpoint weight 7, the signal from the weight divider from the signal divider signal 8. weight signal. The error signal is sent to the input of the weight regulator4, which through the additional and second signals 2 by the feeder 1.

At underloading of the mass (improvement of the ss capacity of the spun material), the error signal of the sensor 10 in the 1G gauge from the element 12 compares to the input of the load regulator 13. It generates a correction signal that goes to the comparison element 5 | where it is added to the weight setpoint signal 7. The regulator VAS 4 handles the mismatch, and upeachi. va feed source material. Setting 45 of load controller 13 ensures the aperiodic nature of the summing up of the load level to the task without overshoot and by smoothly taking into account the time of 31 delaying the introduction of a correction signal,. 50

If the quality of the initial material is uuha, it was done (for example, the steepness increased) and the mill load level exceeded the task, then the overload signal extraction block 15 outputs a signal proportional to the load level of the task. This signal is fed to the amplitude discriminator 16, the channels of which are tuned to different levels of the input signal. With a minimum level of this signal60

the first channel of the discriminator is triggered, and the control key 17 completely disables the correction signal coming from the signal divider 14. If the load level of the mill continues to rise, then the second, third, etc. are triggered. channels of the discriminator 16. These channels affect the control key 17, which successively steps down the signal taken from the signal divider. When the load level returns to flow, the signal divider stages 6 are turned on.

While the initial power supply of the forsier is reduced by the blocks 15j 16 and the control key 17, the magnitude of the output of the load control regulator 13 to the signal divider 14 is gradually reduced, and the necessary amount of the correction signal is prepared.

The use of the described automatic load control system to automate the grinding process in the pelletizing plants allows an increase in the productivity of these miners to 4-5%.

While maintaining the productivity unchanged, the grain size of the crushed product is reduced, the residue on the 4O micron sieve is reduced from 28 to 20%, which makes it possible to reduce the content of fines in the finished pellets.

Formula inventions

The system of automatic control of the mill load, containing a weight adjuster and a weight sensor mounted on the feed conveyor, connected via a comparison element and a weight regulator to an actuator connected to the feeder, a sensor and a load | mill load. The connection is through a comparison element to the regulator A loading torch, characterized in that, in order to improve the quality of regulation and the speed of the system, an amplitude discriminator, a control key, signal dividers and a signal extraction unit are introduced into it A reboot whose input is connected to the input of the load controller connected to one of the signal multiplier inputs, the second input of which is connected via the control key and amplitude discriminator to the output of the overload signal output unit, and the output from the jitter to the inputs of the controller comparison element weights; the other input of the comparison element is connected via a second signal divider with a control key and a weight setter.

Sources of information taken into account in the examination:

1. Khan, A. A., et al. Automation of factories at o6t, M. / Nedra, 1974,

with. 58-59.

2. USSR author's certificate number 388464, cl. B 02 C 25 / GS, 1970.

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