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Method of on-line diagnosis of rift of rolling mill transmission mechanism safety pin

A technology of transmission mechanism and diagnosis method, which is applied in the direction of roll safety equipment, metal rolling, metal rolling, etc., and can solve problems such as rolling mill overturning accidents, rack locking mechanism damage, etc.

Active Publication Date: 2008-09-03
MAANSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the safety pin of the transmission mechanism of a certain stand breaks during the rolling process, if there is no online diagnosis function program for the breakage of the safety pin of the transmission mechanism of the rolling mill, the stand will be pushed and pulled vigorously by the upstream and downstream stands. If the rolling continues, it will cause serious damage to the frame and the frame locking mechanism of the upstream and downstream frames. In severe cases, it may cause the rolling mill to overturn. Section steel continuous rolling production line is not uncommon
In view of the fact that there is still no reliable method to detect the breakage of the safety pin of the rolling mill transmission mechanism on-line, timely and accurately, so far, no rolling mill machinery and electrical equipment manufacturing company at home and abroad can provide the safety pin of the rolling mill transmission mechanism for the rolling mill control system. Broken On-Line Diagnosis Function Program

Method used

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  • Method of on-line diagnosis of rift of rolling mill transmission mechanism safety pin
  • Method of on-line diagnosis of rift of rolling mill transmission mechanism safety pin
  • Method of on-line diagnosis of rift of rolling mill transmission mechanism safety pin

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Embodiment Construction

[0032] Now in conjunction with the accompanying drawings, take the small H-shaped steel continuous rolling mill of Maanshan Iron and Steel as an example to specifically illustrate how the present invention is implemented: through the analysis of the safety pin fracture accident of a large number of rolling mill transmission mechanisms of the small H-shaped steel continuous rolling mill: And in the normal rolling process, if the instantaneous impact load of the rolling mill is too large to cause the safety pin of the rolling mill transmission mechanism to break, the instantaneous impact load of the rolling mill is usually within the maximum allowable output torque T of the main drive motor of the rolling mill. dmMore than 1.1 times of that, that is, α=1.1, and after the safety pin breaks, the actual speed of the main drive motor changes from a steep drop to a sharp rise, and its speed increase rate is usually greater than 300 rev / min / s, that is, β=300, However, in the normal pro...

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Abstract

The invention discloses a method for diagnosing rolling mill transmission mechanism securing pin rupture on line, the method is directly used on rolling mill programmable controller PLC, that is the rolling mill control system, the set sampling period is 50 milliseconds, which does not affect normal work of rolling mill control system. The main transmission inverter of the rolling mill transmits the actual speed and the actual output torquemoment of the main drive motor to the rolling mill programmable controller PLC through communication net wire, the PLC accomplishes sampling, calculation and stores data according to the method, and then whether the securing pin ruptures is judged. Once the securing pin ruptures, the rolling mill control system will blockade enable signals of main transmission inverters of every rolling mill in the tandem mills at once, the tandem mills stops freely, in order to avoid the phenomenon that machine frame locking apparatus and machine frame base anchor are broken by serious pushing and pulling between machine racks after the securing pin ruptures in the tandem mills, and ensure the stable operations of rolling mill and other equipments.

Description

technical field [0001] The invention belongs to the technical field of safety protection of rolling mills, and in particular relates to an online diagnosis method for safety pin breakage of a rolling mill transmission mechanism. Background technique [0002] For continuous rolling mills, most of the fracture accidents of the safety pin of the rolling mill transmission mechanism occur in the case of the instantaneous large load impact of the rolling mill. Fatigue and its own quality problems, the phenomenon of fracture in the normal rolling process without instantaneous load impact. However, when the safety pin of the transmission mechanism of a certain stand breaks during the rolling process, if there is no online diagnosis function program for the breakage of the safety pin of the transmission mechanism of the rolling mill, the stand will be pushed and pulled vigorously by the upstream and downstream stands. If the rolling continues, it will cause serious damage to the fra...

Claims

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Application Information

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IPC IPC(8): G01N19/00B21B33/00
Inventor 叶光平徐璐
Owner MAANSHAN IRON & STEEL CO LTD
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