RU2451320C2 - Method for automatic control of electric drive of blast furnace gas sampling machine - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: method is proposed for automatic control of an electric drive of a blast furnace gas sampling machine, comprising an electric drive that moves a survey pipe along the specified point of gas sampling in a blast furnace. A frequency controlled electric drive is used for control, which is controlled by a logical controller, at the inlet of which encoder pulses arrive as the survey pipe moves, which register the pipe movement. In a logical controller there are N counters of encoder pulses arranged in a program manner, as containing actuation setpoints corresponding to points of gas sampling, at the same time the electric drive stops in point of gas sampling by commands arriving from a logical controller provided that pulse values in the counters are equal to actuation setpoints, and the sequence of movement from a point to the next one is realised by a signal of a control device "Sampling over".

EFFECT: higher reliability and improved quality of controlling an electric drive of a blast furnace gas sampling machine.

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Description

The method relates to electrical engineering and can be used in blast furnace production of ferrous metallurgy and other industries in installations for moving materials over specified distances.

A known method of controlling the electric drive of a gas sampling machine of a blast furnace, by means of a relay-contactor control that directly launches an electric motor; and tracking the movement of the probe is carried out by means of a synchro position sensor.

The disadvantage of this technical solution is the presence of power shocks in the drive chains of the carriage, moving the probe during direct starts of the electric motor, and the complexity of the circuitry for tracking the movement of the research tube by means of a multi-turn synchro position sensor.

The aim of the proposed method is to increase reliability and improve the quality of control, eliminating power shocks due to the smooth acceleration and braking of the mechanism of the gas sampling machine.

This goal is achieved through the use of a variable frequency drive controlled by a logic controller and a pulse encoder that monitors the movement of the research tube.

Figure 1 shows a functional diagram of an automated electric drive of a gas sampling machine that implements the proposed method.

For control, a frequency-controlled electric drive 1, controlled by a logical controller 2, was applied to the input of which, when the research pipe 3 is moved, encoder 4 pulses are received, which record the pipe movement, while in logic controller 2 N encoder pulse counters are shown programmatically, shown in Figure 2, containing operation settings Par1, Par2 ... ParN corresponding to the gas sampling points, while the electric drive 1 stops at the gas sampling points 5 according to the commands received from logic controller 2 at p equality received in response setpoints pulse counters values and the sequence of movement points is made to the next by a signal control unit "Selection complete" (the diagram is not shown).

The scheme works as follows.

By the "Start" command from the control device (not shown in the diagram), the logical controller 2 sends a command to the control input of the frequency converter 1 to rotate the electric motor 6 with a speed set in advance by the frequency converter. The probe 5 from the initial position of point 1 begins to move, while the encoder 4 feeds the pulses to the input of the logic controller, where N pulse counters are organized, Fig. 2, of the encoder containing the settings of the operation Par1, Par2 ... ParN, corresponding to the distances of points 1, 2 ... N gas sampling along the radius of the furnace 7, if the number of counted pulses is equal to the counter set point, the logic controller 2 generates a control signal to the frequency converter 1 to stop the drive motor 6 for sampling gas in the research tube 5 (device your gas sampling is not shown in the drawing), the control device, after gas sampling, gives the logic controller 2 the signal “Sampling is finished”, logic controller 2 gives the control signal to the frequency converter 1 for the next movement of the research pipe 5, which is processed similarly to the above.

Claims (1)

A method for automatically controlling the electric drive of a blast furnace gas sampling machine, comprising an electric drive moving the research pipe along predetermined gas sampling points in a blast furnace, characterized in that a frequency-controlled electric drive controlled by a logic controller is used for control, the input of which when moving the research Encoder pulses are received to the pipes, which record the movement of the pipe, while N logic counters are programmatically organized in the logic controller in the encoder containing the operation settings corresponding to the gas sampling points, while the electric drive stops at the gas sampling points according to the commands received from the logic controller when the pulse values in the counters are equal to the operation settings, and the sequence of movement from point to the next is performed by the signal of the control device The selection is over. ”

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