Control method for load relay of hot continuous rolling thin-specification rolling frame

A technology of relay control and rolling stand, which is applied in the direction of rolling mill control devices, metal rolling, metal rolling, etc., can solve problems affecting the normal production of rolling lines, economic losses of enterprises, and high no-load pressure, etc. The effect of abnormal signal of load relay, saving failure time and avoiding influence

Active Publication Date: 2015-02-04
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] With the increase of thin-gauge steel types, the no-load pressure of the rear frame is increasing, sometimes reaching 600-700 tons, resulting in abnormal judgment of the load relay of the strip frame, resulting in direct scrap steel between the frames, affecting the rolling line The normal production will bring great economic losses to the enterprise

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: When the rolling Q235 specification is 1.5mm*1250mm, the no-load pressure of the F5 frame is 500 tons; the no-load pressure of the F6 frame is 650 tons; if the rolling pressure increase reaches 300 tons, the corresponding frame belt The steel head load relay is on. Therefore, when the strip head arrives at the F5 rack, that is, the computer strip head tracking position is equal to 205.5m (the physical position value of the F5 rack + 2 m), the strip head tracking window opens, and the computer scan time is 10 ms , the rack rolling pressure values ​​detected during the two scanning times are 600 tons and 900 tons respectively, and the rolling pressure increase value is 300 tons, so it is judged that the F5 rack load relay is connected; when the strip head reaches the distance F6 When the rack, that is, the computer strip head tracking position is equal to 211m (the physical position value of the F6 rack + 2 m), the strip head tracking window is opened, and the ...

Embodiment 2

[0017] Example 2: When the specification of the rolled container plate is 1.4mm*1250mm, the no-load pressure of the F5 frame is 550 tons; the no-load pressure of the F6 frame is 700 tons; if the rolling pressure drop reaches 300 tons, the corresponding frame Strip tail load relay opens. Therefore, when the strip tail distance leaves the F5 rack, that is, the computer strip tail tracking position is equal to 201.5m (the physical position value of the F5 rack - 2 m), the strip tail tracking window opens, and the computer scan time is 10 ms, twice The rolling pressure values ​​of the racks detected during the scanning time are 1200 tons and 800 tons respectively, and the rolling pressure drop value is 400 tons, so it is judged that the load relay of the F5 rack is disconnected; When the strip tail tracking position value is equal to 207m (the physical position value of the F6 frame - 2 m), the strip tail tracking window is opened, the computer scan time is 10 ms, and the rolling ...

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Abstract

The invention discloses a control method for a load relay of a hot continuous rolling thin-specification rolling frame. When the thickness of a strip steel finished product is smaller than or equal to 1.6 millimeters, the switch-on/off of the frame load relay is judged according to a frame rolling pressure value; the frame rolling pressure value is equal to the sum of the detection values of pressure detection devices on both sides. According to the method, a frame rolling load relay signal control program is developed specific to a rolling thin specification by making full use of the characteristics of advancement and operability of a computer control technology, the control problem and the major potential hazard of damage to mechanical equipment caused by signal abnormality of the frame load relay are solved and eliminated, the failure time is shortened, the product quality is enhanced, and a good benefit is achieved. The method is suitable for controlling the frame of a hot rolled strip finishing mill.

Description

technical field [0001] The invention belongs to the field of steel rolling, and in particular relates to the automatic control of the finish rolling stand of a hot strip rolling line. Background technique [0002] There are rolling mills F0 to F6 (7 rolling mills) in the hot rolling finishing area. The pressing, looping, roll bending, and tracking control of each rack are all determined by the rack load relay signal. The rack load relay signal is usually The on-off is judged by the size of the rolling pressure, that is, when the head of the strip bites into the frame and the rolling pressure of the frame is greater than or equal to 350 tons, the frame load relay signal is connected; when the tail of the strip leaves the frame and When the rolling pressure is less than 350 tons, the frame load relay signal is disconnected. [0003] With the increase of thin-gauge steel types, the no-load pressure of the rear frame is increasing, sometimes reaching 600-700 tons, resulting in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B38/06B21B37/00
Inventor 张世厚康炜
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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