SU760936A1 - Method of regulating tops density - Google Patents

Description

The invention relates to the tobacco industry and is intended for use on tobacco-cutting machines.

A known method of regulating the density of the top in tobacco cutting machines, including press drums, connected to the cargo carriage, which consists in adjusting the density of the top by changing the position of the cargo carriage [1]. . ten

The disadvantage of this method is the low accuracy and resolution of the regulation.

The aim of the invention is to improve the accuracy of controlling the density of the top. 15

This is achieved by determining that the current density of the top is determined by the pressing pressure and the humidity of the top, while the humidity of the top is determined by its dielectric constant and the pressure of pressing, and the position of the cargo carriage is changed depending on the mismatch of the current and the specified values of the top density.

FIG. 1 shows a plot of 25 dielectric constant ξ of tobacco raw materials on pressing pressure P, for example, for three moisture values

and 1U ₃ ; in fig. 2 - dependence graph

density p from pressing pressure P 30

2

for the same moisture values of the material; in fig. 3 - a graph of the dependence of the optimal pressing pressure P on the humidity ensuring the optimum value of the density of the top p _0P t; in fig. 4 is a diagram of a device that implements the proposed method, which is installed, for example, on a K6A type tobacco cutting machine.

The measured values of ξ _χ and р _x determine the humidity of the top, for example, Ψ ₂ , and by р _х and found (Г ₂ - the current value of the density of the tops p _x , which is compared with the given optimal value p _0P t. For a given ΐϊ? 2 ·

The pressing path of tobacco raw materials in a Tabakorezalny machine Η 6A consists of a feeding conveyor 1, subpressing rollers 2, 3 and pressing rollers 4-6 fixed on the lever 7. The lever 7 is fixed at one end to the machine bed, and at the other end is a load 8 having the ability to move on the lever through the screw pair.

A device that implements the proposed method contains an automatic dielectric permeability meter 9, which has a capacitive sensor at the input, which is made in the form of a coplanarly arranged flat electrodes fixed on the built-in bottom bar 760936

.,, -, 3

piece 10 dielectric base. The output of the meter 9 is connected to the first input of the first computing device 11, to the second input of which the output of the pressing pressure measurement unit 12 is connected, for example, using a rheostat sensor 13, the slider of which is kinematically connected with the load 8. The outputs of the unit 12 and the first computing device 11 are connected with the first and second inputs, respectively, of the second computing device 14. In addition, the output of the first computing device 11 is connected to the input of the unit 15 for calculating the optimal density value . The outputs of the unit 15 and the computing device 14 are connected to the inputs, first and second, of the adder 16, the output of which is connected to the input of the isodromic regulator 17, for example, of the RPIB type, commercially produced by industry. The output of the regulator 17 is supplied to the reversing motor 18, the shaft of which is kinematically connected with the mechanism 19 for moving the load.

The device works as follows.

The dielectric permeability of the tobacco top at the exit from the press path of the machine is measured using an automatic meter 9. At the same time, the pressing pressure is measured by the position of the center of mass of the load 8 on the lever 7 by means of block 12. The output signals of blocks 9 and 12 are proportional to the dielectric constant of the top and the pressure, accordingly, they are fed to the inputs of the first computing device 11, which implements the operation of determining the humidity of a top by the dependence in FIG. one.

The output signal of the device 11, proportional to the humidity of the top, is fed to the first input of the second computing device 14 and to the input of the block 15. The second input of the device 14 receives a signal from the output of the block 12, proportional to the pressing pressure.

The device 14 implements the operation of determining the density of the top of the signals, proportional to humidity and pressure, according to the dependence in FIG. 2. The output signal of block 15 is proportional to the optimum density of the top for a given humidity in accordance with the graph in FIG. 3

four

The output signals of the unit 15 and the device 14, proportional to the optimal and current values of the density of the top, are fed to the inputs of the adder 16, the output of which is proportional to these values, is fed to the input of the controller 17.

In case of equality of the optimal and actual density of the top, the control signal at the input of the regulator 17 is absent. When this engine 18 is not included and the position of the center of mass of the load 8 does not change.

When changing the pressing conditions, changing the humidity of tobacco leaves or changing pressing pressure caused by a change in the amount of tobacco mass fed to the machine, a control signal appears at the input of the regulator 17 that is proportional to the difference between the new optimum density and the current top density values while changing them. In this case, the regulator 17 will control the engine 18 in such a way as to compensate for the difference that has appeared, depending on the sign of which the engine will move the center of mass of the load 8 to the position corresponding to the optimum density value of the top at a given humidity.

The proposed method allows to improve the accuracy of controlling the density of the top in the tobacco-cutting machines.

Claims (1)

Claim The method of regulating the density of the top in the tobacco cutting machines, including pressing drums connected to the cargo carriage, by changing the position of the latter, characterized in that, in order to improve the control accuracy, the current value of the density of the top is determined by the pressing pressure and humidity of the top, while the latter is set by its dielectric constant and pressing pressure, and the change in the position of the cargo carriage is carried out depending on the mismatch of the current and specified density values na