SU1158238A1 - Arrangement for automatic controlling of pulp hydrotransport system - Google Patents

Abstract

DEVICE OF AUTOMATIC POISONING hydrotransport system pulp product with windmills, classifiers with a actuating water supply mechanisms unloading mills system overflow wells, comprising two sensors product size, the pulp flow sensor, physico-mahlnicheskih properties of pulp and a computing unit, wherein the size of the product the first sensor is arranged at the outlet of the bypass well system, and the second sensor of the product size and flow and physical-mechanical properties of the pulp sensors is installed Lena inlet system of bypass wells, characterized in that, in order to improve control accuracy, it is equipped with executive mechanisms for supplying ore and water to the mill load, sensors of ore and water flow to the load and unloading of the mills, density sensors for classifiers, and outputs ore and water consumption sensors in loading and unloading mills of the plum density sensors of the classification (L S tori, as well as flow sensors and physico-mechanical properties of the pulp and product size sensors are connected to the corresponding inputs computations z litelny block, and the outputs of the computing block connected to co.vetvet-. operating mechanisms for supplying the ruy to the loading of the mills and to the loading and unloading of the mills.

Description

eleven

The invention relates to the automation of, primarily, gravity hydrotransport of slurries and concentrates, and can be used at the ore-dressing enterprises of ferrous and non-ferrous metallurgy, industrial minerals, building materials, chemical technology, etc.

A control device for the hydraulic transport of pulp products is known, which performs a slurry bypass along a stepped gradient with a flow rupture in the form of a cascade consisting of individual sections of pipes and wells connected by interconnecting pipes. This device makes it possible to control the size of the product at the outlet of the hydrotransport system. Device control elements in the form of diaphragms l.

However, in this device, the regulation of the size of the finished product is carried out manually, the accuracy of the regulation of the size of the product is insufficient and it does not stabilize the flow of pulp in terms of flow rate and density.

Closest to the present invention is a device for automatically controlling the system of hydrotransport of pulp products with mills, classifiers with executive mechanisms for supplying water to unloading. mills and a system of bypass wells, - containing two large-scale sensors of a product, a flow sensor, a sensor of physical and mechanical properties; pulp and computational unit, the first sensor of product size is located absenteeism, KNMH wells, and the second sensor of product size and flow sensors and physical and mechanical properties of the pulp are installed at the inlet of the bypass system ... l2 wells,

In this device, the product size sensors and the pulp flow sensor are connected to the corresponding inputs of the computing unit, one of their inputs is connected to the first product size sensor located at the outlet of the bypass system, the output of the number block is connected to one controller hopper, the other input of which is connected to the second sensor of product size, and the controller output is connected to the corresponding actuator 82822

Changes in the water supply to the unloading of mills.

Maintaining a given size of the finished product at the outlet of the hydrotransport system, taking into account the regrinding of the product during transportation, is carried out automatically.

However, the device does not provide for the management of such important indicators of the output product as the density and oaskhop of the pulp. Due to factors such as feeding down feeders, the lack of ore in the bunker, untimely switching to a standby feeder and other technological failures, pulp flow fluctuations are created at the discharge of the classifier for this production line and, therefore, in the output product

grinding compartments (combined discharge of classifiers). In addition to fluctuations in consumption, there are also fluctuations in the density of the pulp due to Toroj;

ORE can be compensated by adjusting the density of the pulp on the sink, the classifier, since with a shortage of ore, the executive mechalism on the drain of the classifier is set to the extreme position and does not compensate for the excess water with pulp, the reverse Kartiya is observed with an excess of ore.

Although the discharge, classifiers of all the technological circuits of 1 crushing lines are combined before feeding into the hydrotransport system and fluctuations in the flow rate and pulp density of individual production lines in the general flow are somewhat smoothed, they still

are still quite significant.

This leads to the fact that the flotation comes with a variable flow and density product, which leads to significant losses of the valuable component due to overflow of pulp, fluctuations in the level and density of pulp in flotation machines.

These losses can be avoided by stabilizing the output product not ONLY ON the granule composition, but also on the flow rate and density of the pulp.

The purpose of the invention is to increase the accuracy of control.

The goal is achieved by the fact that the device automatically controls the hydraulic system of pulp products with mills, classifiers and using mechanisms for supplying water to the unloading of mills and a system of wells that contains two sensors of product size, a pulp flow sensor, a sensor for the physical and mechanical properties of the pulp and a computation block. the product size sensor is located at the outlet of the bypass block system, and the second product size sensor and flow sensors and physicomechanical sensors The pulp arm is installed at the inlet of the bypass well systems, equipped with executive mechanisms for supplying ore and water to the mills loading, data on ore and water consumption for loading and unloading mills, classifiers for the discharge of the ore and water flow meters and unloading of mills, density sensors of the sl1gwa classifiers, as well as flow sensors and physicomechanical properties of the pulp and size sensors, the product is connected to the corresponding inputs of the computing unit, and the outputs of the computational unit are connected to coo sponding mechanical actuating Mami ore feed to the feed mills and water loading and unloading mills. The newly introduced sensors and actuators, together with the controlling computing unit and their connections, together allow changing the set values for the control circuits for ore or water supply in the controlling computing unit to stabilize the contents of the solid and liquid phases in the output product. The drawing shows a block diagram of a device for automatic control of a system of hydrotransport of bullets. new products. The device consists of mills 1, classifiers 2, actuators for supplying water to the unloading of mills 3, the system of bypass wells 4, the first sensor of product size 5, the second sensor of product size 6, the sensor for the pulp 7 sensor for the physico-mechanical properties of the pulp 8, the actuators supply of ore to mills 9 and 10, executive mechanisms for supplying water to the loading of mills P and 12, sensors for ore consumption to mills 13 and 14, sensors for water flow to the loading of mill 15 and 16, sensors for water flow in 18, sensors in mills 17, the discharge of classifiers 19 and 20 and computational, block 21, the device operates as follows. Information about the parameters of mills 1, classifiers 2 and bypass well systems A using sensors 5-8, 13-20 with an output signal in the form of direct current, proportional to the measured physical quantities, goes to the control computing unit 21, where the current signals of the sensors are converted into DC voltage signals in turn, which in turn alternately, starting from sensor 5, are converted into a digital code proportional to the measured physical quantities, which is stored in the memory of the computing unit 21. After averaging the values of the parameters measured by the sensors 5-8 and 13-20 in the digital code, for example, using the moving average algorithm in block 23, the control actions are calculated according to the standard control law, for example, the PST law. The calculated control actions from the digital code in block 21 are alternately converted into direct current signals, which are provided to additional mechanisms 3, 9, 30, 11 and 12. The executive mechanisms work the mismatch between the average values of the parameters and the values set in the memory of block 21 mi parameters. This is how the device works until any actuator 3 or 9.10 or 11.12 is set to its extreme position. Unit 21, in conjunction with sensors and actuators, is a multi-channel digital controller and setting any actuator to its extreme position means that the controller of any parameter cannot work out the errors. Such a situation is possible with different /. technological violations, for example, blocking the chute of the mill feeder with ore, the absence of ore in the bunker of any production line, partial clogging of the water supply pipeline to the loading or unloading of the mill, etc. For example, on one of the processing lines, which may be as much (10-15), there was a decrease in the supply of ore or water, and the corresponding executive mechanism 3 or 9.17 or 11, 12 was set to the extreme position. In this case, the magnitude of the mismatch (the difference between the target and the average value of the ore or water consumption) is not reduced in accordance with the PID control law. In this case, the computing unit 21 increases in proportion to the magnitude of the mismatch and equal parts of the corresponding ore (or water) flow. adjusting other process lines in this wayJ to withstand the specified value of the pulp flow at the input of the bypass well system 4 The value of the pulp flow measured by the sensor 7 will be t equal to the target value at block 21 the pulp flow, since a change in water flow rate or ore in a process whether: SRI altering yuschee pulp flow will be compensated in other processing lines operating at a common drain of the finished product. Since the change in the set values of ore or water consumption in the process lines is accompanied by a change in the discharge density of the classifiers measured by sensors 19, 20, so that the density of the classifiers in the process lines and at the inlet of the bypass well system A remains at a predetermined level, additional correction is made water consumption in the process lines in such a way that with an increase in the specified value of ore (water) consumption, the specified value of water (ore) consumption increases. However, in any case, the final goal of the adjustment is the stabilization of the quality of the finished product at the output of the hydrotransport system according to beats, i.e. granulation, density. and pulp flow. The device makes it possible to improve the technological indices by extracting the useful component and eliminating the loss of the valuable component with needles / tails from the flotation chambers.

Claims (1)

AUTOMATIC CONTROL SYSTEM OF PULP PRODUCTS HYDRAULIC TRANSPORT SYSTEM with mills, classifiers with actuators for supplying water to the unloading of mills and a bypass system, containing two particle size sensors, a pulp flow sensor, a physical and mechanical properties sensor of the pulp unit and a computing unit at the outlet of the bypass well system, and the second particle size sensor and flow sensors and physico-mechanical properties of the pulp are installed on at the inlet of the bypass well system, characterized in that, in order to improve control accuracy, it is equipped with actuators for supplying ore and water to the mill loading, sensors for ore and water consumption in the mill loading and unloading, and classifier discharge density sensors * and outputs ore and water flow sensors for loading and unloading mills ^ classifier drain density sensors, as well as flow sensors and physico-mechanical properties of pulp and particle size sensors connected to the corresponding inputs will calculate unit, and the outputs of the computing unit are connected to softvetst-. operating actuators of ore supply to the loading of mills and water into the loading and unloading of mills. cl N3 00 □ about 1158238