Rotation speed low-pass filter method and device for bar-wire mill

Abstract

The invention discloses a rotation speed low-pass filter method and device for a bar-wire mill, and the rotation speed low-pass filter method comprises the steps: controlling a set rotation speed value of the bar-wire mill to rise or fall to a target rotation speed value in a process that the bar-wire mill works according to the set rotation peed value, so as to present a step response process ofthe actual rotation speed value of the bar-wire mill; collecting an actual rotation speed feedback value of the bar-wire mill in a stable stage; adopting a digital low-pass filter for filtering the actual rotation speed feedback value of the bar-wire mill in the stable stage; and determining the actual rotation speed value obtained after filtering processing as the actual rotation speed value of the bar-wire mill in the stable stage. The accuracy of transfer function parameter identification can be improved, so that a transfer function which conforms to the actual rotation speed of the bar-wire mill is obtained, and thus, the bar-wire mill is controlled to work, the situation that bars and wires on the mill are accumulated is effectively prevented, and the bar and wire production efficiency is improved.

Description

technical field [0001] The invention relates to the field of rolling mill control, in particular to a method and device for low-pass filtering of the rotational speed of a bar and wire rolling mill. Background technique [0002] This section is intended to provide a background or context to embodiments of the invention that are recited in the claims. The descriptions herein are not admitted to be prior art by inclusion in this section. [0003] The continuous hot rolling production line of rods and wires refers to the way of physical deformation, so that the thick and short steel billets are continuously squeezed to form thin and long steel products. [0004] Before the steel billet is sent to the rod and wire rod hot rolling production line, the steel billet needs to be heated. The steel slab at room temperature is moved to the heating furnace through the walking beam, and the heating furnace uses coal gas or natural gas to heat the slab. In the heating furnace, the stee...

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Problems solved by technology

[0015] In the embodiment of the present invention, a low-pass filtering method for the speed of a bar and wire mill is provided to solve the problem that in the prior art, the transfer function derived from the built-in parameters of the frequency converter is used to control the work of the bar and wire mill, so that there is a large deviation in the actual speed of the bar and wire mill To solve the technical problem, the method includes: during the process of the bar and wire mill working according to the set speed value, controlling the set speed value of the bar and wire mill to increase or decrease to the target speed value, so that the actual speed value of the bar and wire mill presents a step Step response process; collect the actual speed feedback value of the rod and wire mill in the stable stage, the stable stage is the stage where the actual speed value is stabilized between the lower limit of the steady state of the speed and the upper limit of the steady state of the speed after going through the step response process; The digital low-pass filter filters the actual speed feedback value of the rod and wire mill in the stable stage; the actual speed value after filtering is determined as the actual speed value of the rod and wire mill in the stable stage

[0016] The embodiment of the present invention also provides a low-pass filtering device for the speed of a bar and wire mill to solve the problem of using the transfer function derived from the built-in parameters of the frequency converter to control the work of the bar and wire mill in the prior art, so that the deviation of the actual speed of the bar and wire mill is relatively large. Big te

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