A kind of roll gap setting method of coiler assist roll

Abstract

Disclosed is a roll gap setting method of a wrapper roller in a recoiling machine. The method belongs to the technical field of control. A temperature measuring instrument is arranged at an inlet of a recoiling machine set. An initial roll gap set value static table is established in a host computer. According to characteristics of strip steel in different specifications, initial roll gap set values of different wrapper rollers are set. When the host computer receives a steel-biting signal, three initial roll gap set values of the wrapper roller are searched in the initial roll gap set value static table of the wrapper roller and then the three initial roll gap set values are downwardly sent to a recoiling basic automatic computer of the recoiling machine. According to an actual recoiling temperature, the recoiling basic automatic computer carries out a corresponding compensative correction to roll gap set values. Influences of factors such as a recoiling temperature, a width of the strip steel and a thickness of the strip steel on tightness degree of a rolling layer of an inner circle of a steel roll can be fully considered. All of the influences of the factors on the tightness degree of the rolling layer of the inner circle of the steel roll can be considered. Inner circles of various steel rolls are ensured to be compact and slipping accident of the recoiling machine can be effectively reduced. In addition, introduction of thick-specification stripe steel can be improved and steel-waste accident is reduced.

Description

technical field [0001] The invention belongs to the field of coiling process control of hot continuous rolling, and in particular relates to a method for setting a roll gap of an auxiliary roll of a coiler. Background technique [0002] The coiler is an important equipment of the hot rolling production line, which is used to coil the rolled finished hot-rolled steel strip into steel coils. [0003] The coiler is located behind the finish rolling unit and is the last process of the hot rolling production line. [0004] The main mechanical structure of the coiler see figure 1 , The coiler mainly includes major equipment such as a roller table 11, a side guide plate 12, a pinch roller 13, three auxiliary winding rollers 14 and a reel 15. [0005] Among them, the roller table 11 is mainly responsible for transporting the steel strip from the finishing rolling unit to the coiler. The main function of the side guide plate 12 is to center the strip steel. The main function of t...

AI Technical Summary

Problems solved by technology

[0021] 1) Thin plates are prone to slipping accidents: According to the roll gap setting formula of the existing roll-up rolls, the roll gap of the No. 1 roll-up roll should be set to the thickness of the strip + 8.5mm, After the number of coiling rolls, it takes 0.077 seconds for the coiling rolls to press down to the strip, and the speed of thin plate threading is usually about 11-12 m / s. The coiling roll can bite the strip steel, and at this time the strip steel head has actually reached the second coiling roll

Because the 3 auxiliary rolls did not play a good role in clamping and biting the strip when the strip head was wound on the first turn of the reel, the thin strip head could not be wound tightly on the reel. Skidding accidents are more likely to occur;

[0022] 2) In the production of thick plates, problems such as poor formation of the strip head and scrap steel: the roll gap setting formula of the existing roll-assisting roll is too small when coiling the limit thick plate. On the one hand, this increases the The impact force of the strip steel on the coiling roll when it enters will easily cause damage to the roll surface of the coiling roll; on the other hand, the strip head is difficult to bite into, and the forming is poor, which is prone to steel scrap accidents

[0023] 3) The influence of coiling temperature is not considered: under the premise of the same thickness specification and width specification, the higher the temperature, the harder it is for the head of the strip to wrap tightly on the reel, and slipping accidents are prone to occur

The roll gap setting formula of the existing winding aid roll does not take into account the influence of the coiling temperature

[0024] 4) The influence of the width is not considered: under the premise that the thickness specification and the coiling temperature are the same, the head of the strip steel with a narrower width is more difficult to wrap tightly on the reel, and slipping accidents are prone to occur. The setting formula also does not consider the influence of the width specification

[0025] Through communication and data inquiry, it is learned that there is a lot of manual intervention in each hot rolling production line, and the problem of the influence of coiling temperature and width specification is not considered.

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