SU1681023A1 - Automatic air distribution system for mines and pits - Google Patents

Abstract

This invention relates to shaft ventilation, and b. used to automatically control the ventilation of underground mines1; The goal is to increase the reliability of ventilation control with a well-developed ventilation network. The system contains regulator 1 of the main ventilation fan and N automatic air distribution subsystems (PARV) 2, 3 in sections in each of the N groups of sections whose control outputs are connected to group 4 air flow regulators (GR) in a group of plots. The latter contain actuators with limit switches, the contact outputs of which are connected to the adder (C) 8. The two other outputs of the PARB 2, 3 are connected respectively to C 6 and 7. The outputs C 6, 7 are connected to the inputs of the comparison unit 9. The output of unit 9 is connected to the first input of control unit 10 by controller 1, the second input of which is connected to output C 8, and the output to controller 1. The control signals PARV 2 and C include GR 4 and 5 to change the air flow to the required values. With the full opening of the executive bodies of GR 4 and 5, the C 8 receives a signal from their limit switches. Signals about the measured and specified air flow in all N groups of sites are received at C 6 and 7. The increase in the performance of the main ventilation fan is performed when the C 7 signal exceeds the C 6 signal, and the decrease occurs when the C 6 signal exceeds the C 7 signal and the absence signal from C 8. 3 ill., 1 tab. from about 00 about th go

Description

The invention relates to mine ventilation and can be used to automatically control the ventilation of underground mine workings.

The purpose of the invention is to improve the reliability of ventilation control with a well-developed ventilation network.

FIG. 1 is a functional block diagram of an automatic system.

N

air distribution in mines and mines; in fig. 2 and 3 are possible variants of the known block diagrams, respectively, of the subsystem of automatic air distribution over the sections in each group of sections and the control unit for controlling the performance regulator of the main ventilation fan.

The system contains a regulator 1 of the capacity of the main ventilation fan, N subsystems 2 and 3 of automatic distribution of air over the sections in each of the N groups of sections of the group regulators 4 and 5 of the air flow in the group of sections, the adder 6 signals of the measured air flow in the groups of sections, the adder 7 signals of a given air flow rate for groups of sections, adder 8 signals of limit switches of actuators of group controllers 4 and 5, a comparison unit 9 and a control unit 10 of the regulator 1.

The control outputs of subsystems 2 and 3 are connected to the inputs of their group regulators 4 and 5. The outputs of the signals of the measured air flow of the subsystems 2 and 3 are connected to the inputs of the adder 6. The outputs of the signals of a given air flow of the subsystems 2 and 3 are connected to the inputs of the adder 7. The outputs of the adders 6 and 7 are connected to the inputs of the comparison unit 9. The contact outputs of the signals of the limit switches of the executive bodies of the regulators 4 and 5 are connected to the inputs of the adder 8. The outputs of the adder 8 and the block 9 are connected to the inputs of the block 10, the output of which is connected to the regulator 1.

Subsystem 2 or 3 of automatic air distribution over the sections in each group of sections (FIG. 2) includes (for example, for two sections in the group) sectional air flow controllers, each of which respectively contains sensors 11 and 12 of air flow, set Air flow meters 13 and 14, comparison units 15 and 16, and actuators 17 and 18. Also, limiters 19 and 20 of the signal size, adders 21-23, additional comparison unit 24 and control unit 25 are included in subsystem 2 or 3.

One of the embodiments of the functional circuit of the control unit 10 of the regulator 1 of the capacity of the main ventilation fan is shown in FIG. 3, where the element Y-NOT 26, the element OR 27 is indicated.

The system (see Fig. 1) works as follows.

The control outputs of the subsystems 2 and 3 put the regulators 4 and 5 into operation for changing the air flow to the required value for each group of sections. With the full opening of the executive bodies of regulators 4 and 5, the adder 8 receives a signal from their limit switches. Signals about the measured and specified air flow from subsystems 2 and 3 are received respectively to adders 6 and 7, where their total value is counted. Block 9 monitors whether the total amount of air in all groups of sections is set to the total specified value and, when they mismatch, gives a signal 10, which controls the operation

controller 1. An increase in the performance of the main ventilation fan occurs when the signal of the adder 7 exceeds the signal of the adder 6, and the performance decreases when the signal of the adder 6 exceeds the signal of the adder 7 and the signal from the adder 8 does not change when the signal from the adder 8 is present about the opening of at least one of the executive bodies of the regulators 4 and 5, and in the absence of an excess of the signal of the adder 7 over the signal of the adder 6. All this can be represented as a table tzu with the notation of the algebra of logic.

Thus, this system works with three levels of the control hierarchy: the main ventilation fan — group controllers — district controllers — bottom. This system is designed for

work with a highly developed ventilation network, which is characterized by the presence of several distinct underground horizons, each of which is a separate ventilation

network.

The use of this system in comparison with the known one allows to expand its functionality due to the inclusion of group controllers in the work, to increase the efficiency and reliability of the ventilation control by eliminating the possibility of obtaining unstable operating modes ensuring optimal operation of the fan

main ventilation and reducing power consumption for supplying a technologically necessary amount of air.

Claims (1)

The invention The system of automatic air distribution in mines w mines, containing a performance regulator of the main ventilation fan and N subsystems of automatic air distribution over the areas in each of the N groups of areas, characterized in that, in order to increase the reliability of ventilation control developed ventilation network, N group air flow controllers in the group of sections containing an actuator with limit switches, three adders, a comparison unit and a unit controlling the performance regulator of the main ventilation fan. At the same time, the control outputs N of the automatic air distribution subsystems in sections in each of the N (groups of sections are connected respectively to the inputs of N group air flow controllers in the group of sections whose contact outputs are connected to the inputs of the first adder, two other outputs of the automatic air distribution subsystems on plots in each of the N The groups of sections are connected respectively to the inputs of the second and third adders, the outputs of which are connected to the inputs of the comparator unit, the output of which is connected to the first input of the control unit of the capacity regulator of the main ventilation fan, the second input of which is connected to the output of the first adder, and the output to the regulator performance of the main ventilation fan. 1 C would move a ff / r.9 FIG. ft Fig.Z