SU874777A1 - Vibration drive of the doffing comb of a card - Google Patents

Description

(54) VIBRATING DRIVE OF REMOVABLE CREATIVE OF CHESAL

CARS

one

The invention relates to the field of textile engineering and can be used in the drives of carding machines.

Known vibrodrive removable crests carding machine, containing a vibration motor with electromagnetic excitation, the rotor shaft, which is made torsionally, the reverse sensor. communication, block-forming control oo | dx pulses and a thyristor switch C.

The disadvantage of such a system is the presence of a compensation transformer in the feedback sensor causing additional power loss. In such systems, an electrical signal of complex shape with large noise arises, requiring no signal; | devices.

In addition, the control circuit of the switchboard switchboard, based on the classical pattern using a controlled multivibrator, is used to excite systems with a mechanical resonator, which is the mechanical system under consideration, having a high quality, therefore, high selectivity, is unsuitable due to contradictory

requirements for the selection of the frequency of the multivibrator. For reliable synchronization of the multivibrator, its frequency should be somewhat lower than the synchronization frequency. When the control system is connected, the feedback signal from the sensor is missing and the circuit generates a frequency slightly below the resonant frequency of the mechanical system. In the presence of such a detuning, the necessary does not occur, the buildup of the mechanical system and the formation of a sufficient level of the feedback signal for the operation of the system. With

By this, the system does not synchronize — it is not excited.

From the conditions of self-excitation of the system, the frequency of the multivibrator should be chosen as close as possible.

20 to the resonant frequency of the mechanical system of 2-3%, but then when the frequency of the multivibrator goes upwards due to heating, instability of the supply voltage and other

25 factors disrupt the normal operation of the system and it falls out of synchronicity.

The known control circuit, in addition to the formation of the control pulses 30. Frequency and amplitude,

It does not provide for phase correction, which is also a major disadvantage, because the effective power of the exciter is highly dependent on the phase of the exciting pulses. Indeed, if the excitatory impulses of the exciter are in the opposite phase or lag behind, instead of the buildup, they brake the system, and on the other hand, since all pathogens have inductance, they will necessarily have the lag of the magnetic flux creating mechanical impulses from the applied voltage. As you know, the phase lag is possible from O to. This value should be corrected in the thyristor control circuit.

The purpose of the invention is to increase the efficiency of use of the vibratory drive by creating its excitation resistance.

This goal is achieved by the fact that the 4TO.J vibrodrive of the removable comb of the carding machine has a phase-generating unit, the output of which is connected to the control pulse shaping unit, and the input is connected to the feedback sensor.

The drawing shows a circuit diagram of the vibrating drive of the removable comb of the carding machine.

The vibrodrive contains a vibrating motor 1 with electromagnetic excitation, a torsion shaft 2 connected to the rotor of the vibromotor, an induction sensor 3, a phase-generating unit 4, a control impulse generation unit 5 made on the trigger, and a thyristor switch 6.

Vibro works as follows.

When voltage is applied to the system, the trigger in the control pulse shaping unit 5. is thrown several times due to transients in the system, controlling the thyristor switch 6, which provides pulsed power to the motor ITQK 1, causing the mechanical part of the system to sway. At the same time, the feedback sensor 3 detects these oscillations and outlines the feedback signal of the resonant frequency. - The signal passes the phase-generating unit 4, which provides a phase shift in the range from 0 to 90 (adjustable), which makes it possible to compensate for the phase lag in the pathogen, and

 the system quickly goes into synchronism,

 providing a swinging removable comb, carding machine.

If the system is not energized when the voltage is connected, for example, due to wire breakage, after the breakage is eliminated, the system is excited due to the fluctuation of the current of the phase-generating unit provided by the thyristor trigger control.

The proposed scheme allows one to obtain a stable excitation at the resonant frequency of the mechanical system, to make the system stable, easily repeatable, and not requiring complex instrumentation for its superstructure.

Claims (1)

Invention Formula A vibrodrive of a removable comb of a carding machine containing a vibrodvio0 (electromagnetic excitation gage, whose rotor shaft is made torsionally, a feedback sensor, a control pulse shaping unit, and a thyristor switch, d 5, because of the use of creating a steady excitation of it / it has a phase-determining unit, the output is connected to the block of formation of control pulses, and the output is connected to a feedback sensor. Sources of information taken into account in the examination 1. USSR author's certificate No. 753937, cl. D 01 G 15/36, 1976.