SU670435A1 - Method of determining the effort of urging the debarking member of rotary log-working machine - Google Patents

Description

Signals proportional to the rotational speeds of the rotor 1 of the machine and the tension pulley 2, from the outputs of the tachoheperators 5 are fed to a comparison device (tachometer circuit) 6, where 5 signals are extracted Uc (t) proportional to the difference in the rotational speeds of the rotor 1 and the tension pulley 2 ; fy, () ./ r,. / C.r-Aco, (1) where Dso is the difference in the speeds of rotation of the rotor and the tension pulley; Кс - transfer coefficient of the comparing device; CTG - the transmission coefficient of the sensors is the angular velocity. From the output of the comparison device (tachometer circuit) 6, the signal is fed to amplifier 7, with which the signal is applied and the relation 20 Uy (f) is realized, where t / y (0 is the signal from the amplifier output; / Su is the transmission coefficient Amp-25 From the output of the amplifier 7, the signal is fed to the integrating device 8, in which it is integrated over time: 30 p / s NW./S-/c: - / s "| A and A:" LGG / Stg (p - Tsh), where p is the signal from the output of the integrating device; / C is the transmission coefficient of the integrating device; fr is the angle of rotation of the rotor of the machine and for 40 is time t (see Fig. 1); fs is the angle of rotation of the tension pulley during time t.In turn, Tr - Tm T + Pd + fs (4) 45 where f is the angle of rotation of the rotor relative to the tension pulley, defining tension of the elastic element S; fj - the angle of rotation of the rotor relative to the tension pulley, caused by the deviation of the diameter of the log from the maximum allowable machine; f8 - angle of rotation of the rotor relative to the gg of the tensioning pulley, due to the initial length of the elastic element. To compensate for the component KiiK KcKir ((fd + d) From the INGQ output of the converting device 8, the signal is fed to the input of the compensating device 9. To another input of the compensating device 9, the KaK-yKcKtrffd signal from the sensor 10 deviates the diameter of the log from 65 maximum allowed by the machine. The KiiKyKcKffffs value, which is subtracted from the output signal of the integrating device 8, is entered directly into the compensation device. From the same signal, the Ki value Ki KycKirffd is subtracted, taking into account its sign. The compensating device receives a signal proportional to the angle of elongation of the elastic element of the machine tool pressure device. The force F generated by stretching the elastic element 5 (Fig. 1) FK, -SS 2R cos and sin If / 2, where is the stiffness coefficient of the elastic element; a is the angle of inclination of the mechanical characteristic of the elastic element; R is the radius of the circumference of the points of attachment of the elastic elements on the tension pulley; -y is the angle characterizing the amount of stretching of the elastic element. Since ((f) and the limits of change and f are known and limited, the functional relationship F / Сe2 / cos 7 sin cf / 2 is implemented using a functional converter. From the output of the compensating device 9, the signal goes to the input of the functional converter (profile potentiometer) 11. In this case, the output signal of the profile potentiometer 11 is proportional to the clamping force of the machine tool bearers: (O cos τ sin 9/2. Df / (O, (8) where / Сф is the transfer coefficient of the functional converter. To obtain a signal on the deviation of the box pressure force The maximum potentiometer 11 includes a measuring circuit 12 of the automatic control system of the machine working elements, which compares the signal (8) with the specified value and extracts a signal proportional to the deviation of the pressing force from the specified value: is (0 - isf / SFD ( 0, (9) where K is the transmission coefficient of the measuring circuit; F (t) is the deviation of the pressing force from the specified value. Thus, if it is necessary to receive a signal by the pressing force of the machine spout pickers, it is removed from the output of a profile potentiometer 11, if it is necessary to receive a signal but the pressure of the machine spindle picker is rejected from a predetermined value, the signal is removed from the output of the measuring circuit 12.

Signal extraction (formula 1) is provided by counter-switching on tachogenerators 5. The signal is removed from the output diagonal of the bridge. Since the voltages of the tachogenerators 5 are proportional to the speeds of rotation of the rotor 1 and the tension pulley 2, the polarity and phase of the output signal of the circuit b are determined by the ratio of the speeds of rotation of the rotor 1 and the tension of the cheek 2.

The signal from the output of circuit 6 enters the input of amplifier 7, in which it is amplified in terms of voltage and power. The output winding of the amplifier 7 is connected to the control winding of a reversible electric motor with a gearbox that performs the function of an integrating device 8. When the output coordinate is voltage (formula 2) taken from the output of amplifier 7, the output coordinate integrating device 8 will be the rotation angle of the output shaft of the gearbox, defined expression (formula 3). The output shaft of the reducer is integrated; its devices 8 are rigidly connected with the rotor of the selsyn-sensor of the compensation device 9, represented by a synchronous transmission system consisting of a selsyn-sensor, a differential selsyn and a selsyn-receiver. The rosin of the selsyn-sensor is electrically connected with the stator of the selsyn-differential. The differential rotor is electrically coupled with the receiver and rigidly mechanically coupled to the output shaft of the sensor 10, deviating the diameter of the bore log from the maximum value allowed by the rotor debarker. In order to eliminate nesting, due to the initial length of the elastic element So, the rotor of the selsin differential is rotated by the angle TSi / Su / CsHtgfv relative to the zero position before connecting by mechanical coupling with the sensor 10. In accordance with the principle of operation of the synchronous transmission system with differential selsyn, the rotation angle of the rosin of the selsyn-antenna is b is determined by the algebraic sum of the rotation angles of the rosin of the selsyn-sensor (formula 3) and the rotor of the selsyn-differential. In our case, at the output of the synchronous transmission system, a signal is received in the form of the rotor angle of the selsyn-receiver, defined by the expression bf / 2.

The selsyn-receiver shaft is rigidly connected with the engine of a profile potentiometer 11, which implements the Lp2 / cos7z pf / 2 dependence.

The input value of the profile potentiometer 11 is the angle of rotation of the slider, the output is the voltage taken from the potentiometer (formula 8) that is proportional to the clamping force of the pickups

machine tool.

To obtain a signal proportional to the deviation of the clamping force of the spout pickers from the specified value, the profile potentiometer 11 is inserted into the shoulder

bridge measuring circuit 12 of the automatic control system. FIG. 3 communication engine profile potentiometer of the measuring circuit 12 with the rosin selsina receiver compensation device

9 is shown by bar-nozzle. The signal from the output of the circuit 12 is determined by the expression (formula 9).

Claims (2)

1. Sirotin A. A. Automatic control of electric drives. M., "Energy, 1969, p. 339-340. 2. USSR author's certificate jYo 335096, cl. In 27L 1/00, 1970.