TH12948B - Control procedures for closed-circuit dry method grinding machines - Google Patents

Abstract

The control process for the closed-circuit dry grinding assembly consists of a mechanical mixer for feeding raw materials, a grinder, a variable-speed dynamic separator. The path for taking the material from the grinder to the separator. Method for returning non-crushing coarse materials Enough back to the grinder And the route for conveying the finished product to the outlet of the separator as well as the control process. It is intended for closed-circuit dry grinding assemblies and good for assemblies consisting of a rotary steel ball mill used for the production of cement mortar.

Claims (8)

1. Control system for closed circuit And assembly set to grind by dry process It consists of a mixing device for feeding raw materials, a grinder, a variable-speed dynamic separator, a path for transporting material from the mill to the separator, known as a feed-in separator. Way for Insufficient grinding of materials returned from the shredder to the crusher. Which is called the large ones Exceeded the demand from a separator The path for conveying the finished product Flow meter for They are too large to be desired from a separator. And a way for measuring what is assigned to the place With extraction feeder: The latter may be feeder of the separator itself. Or the power of the lift or the flow rate of the finished product or the flow of the raw material The control system is triggered by - a setting (a) for a larger than required flow rate. From the splitter - adjustable settings (b) for the feed-dependent assignment of the separator - reference value (c) for the speed of the separator. And where the variable end regulator is simultaneously controlled by the true value of the rate The flow of them was too large than the demand from the separator. And the true value of what has been set for that. With the input of the separator And keep these values stable with reference to the settings (a) and (b) by acting on the speed of the separator. And the amount of raw material that is fed into the mill, the actual speed of the separator is steadily compared with the reference value (c) in such a way that the actual speed. Should deviate from the reference velocity (c) for times greater than the setting. The manual adjustment value (b) is automatically changed by the calculator to achieve the new setting (b) that can make the separator speed equal to the reference value (c) again. Which the result of the calculation will be sent to A regulator that will change the setting (b) accordingly while keeping the setting (a) intact. 2. Control process according to claim 1, where the assignment depends on input. The separator is fed into the separator machine. 3. Control process according to claim 1, where the assignment depends on input. The separator is the finished product flow rate. 4. Using the process according to claim 1 for an assembly consisting of a grinder, use a steel ball. 5. Use of the process according to claim 1 for assemblies consisting of a gravel grinder. 6. Use of the process pursuant to claim 1 for assemblies consisting of a compression mill. 7. Control for closed circuit and assembly. Dry grinding process which It consists of a mixing device for feeding raw materials, a grinder, a variable-speed dynamic separator. The path for taking the material from the grinder to the separator. Which is called the feed into the separator Way for Return the insufficient crushed material from the separator back to the crusher. Which are called the ones that are too large Demand from a separator The path for conveying the finished product Flow meter for guys That are larger than the demand from the separator And a way for measuring a given thing that depends on Separator feed: The latter can be either the feed of the separator itself or the power of the hoist, or the finished product flow or the material flow. The control system is triggered by - a setting (a) for a larger flow rate than required by the separator - a self-adjustable setting (b) for a given setting that depends on Feed into the separator - reference value (c) for the speed of the separator. And where the variable end regulator is simultaneously controlled by the true value of the rate The flow of them was too large than the demand from the separator. And the true value of what has been set for that. With the input of the separator And keep these values stable with reference to the settings (a) and (b) by acting on the speed of the separator. And the amount of raw material being fed into the separator, the true speed of the separator is steadily compared with the reference value (c) in such a way that the true speed should Will deviate from the reference velocity (c) for a time greater than the setting Manual correction (b) settings are automatically changed by the calculator. To achieve a new setting (b) that can The speed of the splitter is again equal to the reference value (c). Which the result of the calculation will be sent to the Keep control of which setting value (b) will change accordingly while keeping setting value (a) intact. A multivariate regulator made up of a mathematical process model is established. Relationship between the material feeding flow rate And the variable speed of the separator is controlled, and the flow rate of them is too large to the requirements and the flow rate of the given Provides that depends on the input to the separator that is the controlled value. The mathematical model is defined by the following system of equations (chemical formula), where Yf is the finished product flow rate, Yr is the flow rate of those that are too large to be required from the separator, ua as the flow rate of the Feed us materials as separator speeds, t11, t12, t21 and t22 as time constants and k11, k12, k21 and k22 as process gain. 8. Control process according to claim 7, where the multivariate regulator is a linear quadratic, its control minimizes the quadratic cost threshold associated with the internal conditions.