SU511102A1 - Device for automatic control of the grinding process - Google Patents

Description

degree of load, the input of the active filter is with the output of the capacitor converter, and the output of the low frequency filter is connected to the input of a voltage amplifier with current feedback.

FIG. 1 shows a block diagram of the proposed device; FIG. 2 is a converter amplifier circuit.

The device for the automatic control of the grinding process consists of a load state sensor 1, an amplifier converter made of the following nodes: filter limiter 2, preamplifier 3, low frequency filter 4, voltage amplifier 5 covered by negative feedback 6 current, capacitor converter 7, active filter 8, output unit 9, bias jq, parametric stabilizers 11 and universal power supply 12

The amplifier-conversion unit of the device is connected to the output of the load level sensor. With a depot to ensure high reliability and measurement accuracy of the signal — a proportional degree of loading of the material with a material; the signal induced by a working mill in the sensor of the level of loading is pre-fed; the filter "limiter 2, made on the capacitor 13 and two diodes, included gift & o and counter. Condensate p 13 connected between the input of an amplifier-transformer (5 blocks in the base of triode 14, and diodes 15 and 16 connected between the base of the same triode and the common source of stabilized power supply, serve to smooth the induced emf from low-frequency components due, for example, to the elliptical nature of the mill body, and to deliver it to the maximum or minimum / low. The signal smoothed and limited in amplitude is fed to the pre-amplification unit, completed according to the circuit with a common emitter on a triode 14. P resistors 17 and 18, presentation Voltage divider and turned on, otodevastvenno, between the bladder and the common pole of the power circuit, determine the working point of the voltage amplifier. A low-pass filter, for example, 1 C-filter made on the resistor 19 and capacitors 2O and 21, serves to smooth the amplified preliminary from low-frequency harmonics due to industrial noise, mainly from the 5O Hz component. To ensure the conversion of emf induced in the load level sensor into a signal

 portioned only to the frequency of change. emf, which carries the greatest information, the degree of filling of the mill with material, the signal passed through 1 -f

arrives at the three-stage amplifier for the voltage with a high gain factor, assembled on transistors 22, 23 .p- ;. The mode of operation of the three-stage usi-h power supply is determined by the Eucalyptus torus 25, which is selected from the condition of equality of voltage between the collector and the transistor 24 to half the voltage of the source. For stable operation, three stage amplifier:, voltage. feedback is covered by the emitters of transistors 22 and 24

Claims (1)

To ensure high temperature stabilization of the amplifying and converting unit and reducing nonlinear distortions, the amplifier is covered by deep negative feedback on direct current across resistors 26, 27. A high gain of the voltage amplifier allows to receive at its output rectangular pulses limited amplitudes in both the top and bottom. The amplified and filtered. Signal in the form of rectangular pulses is fed to a capacitor converter-frequency meter, in which you convert into a DC signal proportional to the frequency of the emf induced in the sensor, Diodes 23 and 29 serve simultaneously for rectifying Milli of the transformed signal and separation of the charge and discharge circuits of the capacitor 30. The output unit is made according to the emitter follower circuit of the transistor 31 in the emitter circuit of which a variable resistor 32 is connected, changing the circle. the size of the output characteristic of the converter. In order to smooth the variable. component and reduce fluctuations between the frequency converter unit and the output filter included an active filter made on the output unit triode 31 and a capacitor 33. To highlight the working range of the working mill, by frequency and increase the sensitivity of the control and recording devices to change the degree of filling of the grinder Amplifier material: a transducer has a bias node made on a variable resistor 34. The output signal of the transducer | lzovani .ego in Schemes automatic control process | som milling medium is removed from the movable resistor contacts 32 and 34. To eliminate the self-excitation i and i uluchscheni filtering the rectified on. After the power supply unit, a voltage-phase voltage amplifier and a three-stage voltage amplifier are powered by separate parametric stabilizers, which are filled with zener 35, 36. and resistors 37 and 38. The litany unit is transformed into a single network voltage through a down transformer and a two-half network through a step-down transformer and a two-half network. mi The coil is subjected to direct current voltage, the coir is filtered by a capacitor. C; Tab. 1 TION The output voltage is provided by “zener diodes. Claims of Invention A device for an automatic process type and a sensor containing a load level sensor, a power supply unit and a converter amplifier consisting of a voltage amplifier, a capacitor generator and an output unit, -and that, in order to improve the measurement accuracy and reliability of the device, it is additionally equipped with a series-connected filter-limiter, a pre-I amplifier, a low filter frequency and an active filter with a mixing node, whose output is connected to the output j k, and the input of the filter limiter is 1 pin with the output of the load level sensor. the input of the active filter is with the output of a capacitor converter, and the output I of the low-frequency filter is connected to the input of a voltage amplifier, made with current feedback.