SU1444004A1 - Method of rolling sheet by sheet - Google Patents

Abstract

The invention relates to rolling production, specifically to flat rolling with a polystyrene deformation method. The purpose of the invention is to increase the productivity of the mill by protecting the mill rolls and other equipment of the stand from damage. In the course of sheet rolling, the increase in the thickness of sheets arriving along the rolling mill is monitored by a measuring device located from the roll axis of the stand at a distance greater than 1.2 ways of the roller table braking, the speed of the feeding roller table is set to 0.9-0.95 lines of the roller speed. In case of a change (increase) in the thickness of the sheets or a change in the ratio of the speeds of the roller table and the stand, a team is formed to stop all the mechanisms of the mill. 1 il. from: €

Description

The invention relates to rolling production, namely to sheet rolling method.

The purpose of the invention is to increase the productivity of the mill by protecting the mill rolls and other equipment of the stand from damage.

The drawing shows a block diagram of the device that implements the method of sheet rolling.

The device comprises a stand 1, a roller conveyor 2, an electric drive 3 Cages, a roller drive electric 4, a roller linear speed gauge 5, a comparison unit 6, a roller roller linear speed meter 7, an emergency deflection unit 8, a thickness measuring roller output 5 connected to the first input of the comparison unit 6 and the second input of the electric drive 4, the roller table. The output of the meter 7 is linear. the speed of the roller table is connected to the second input of the comparison unit 6, the output of which is connected to the second input of the emergency shutdown unit 8, the first input of which is connected to the thickness measuring unit 9. The output of the emergency shutdown unit 8 is connected to the input of the electric drive of the 3 stand and the electric drive - 4 live rolls ..

The device works as follows.

In the joint mode, the control signal is fed to the system 3 of the electric drive of the stand.

The gauge 5 of the linear speed of the rolls of the stand sets the speed of the electric drive 4 of the rollers of the feeding roller table 2. Thus, with all changes in the speed of the stand (including when a malfunction occurs in the electric drive), the speed of the roller table will proportionally change.

The control of the presence of the speed difference between the stand and the roller table is carried out in block 6 of the comparison, where the signal from the meters 5 and -7 of the speed of the stand and the roller table enters.

If a malfunction occurs in the electric drive system of the roller table, at which its speed begins to increase and compares with or exceeds the stand speed, emergency shutdown unit 8 receives a command to turn off the stand electric drive and roller drive unit 8 from the comparison unit 6;

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The device of the thickness measurement unit 6 controls a predetermined sheet thickness and, if it is exceeded, forms a command in block 8 for stopping the stand and the roller table. Monitoring the measurement of the sheet thickness prevents the increased thickness from entering the stand rolls.

During the rolling process, an increase in the thickness of the sheets moving along the roll table is monitored by a measuring device located from the roll stand axis at a distance greater than the slowing distance of the roll table. The speed of the feeding roller table is set by a cage speed meter and is selected from 0.9 to 0.95 of the linear speed of the cage rolls. The difference between the speeds of the rolls of the stand and the roller table is measured. When the sign of this difference changes or the specified sheet thickness is exceeded, a command is formed to stop all the mechanisms of the mill.

The reduction in the speed of the feed roller table to a value of 0.9-0.95 from the linear speed of the rolls of the stand is due to the following.

Take the gap between the sheets in the area of the rolls of the cage equal to an average of -0.3 m

During the time t, the sheet will pass the way along the roller table.

S, Vp t (1)

The path of the sheet, passed through the rolls of the stand Sj during time t with a gap of 0.3 m is equal to

, -bO ,,. t, (2)

where VP, VK are the linear velocities of the roller table and rolls of the cage, Reshcha together (l) and (2) get

V.

r in, o7z

The existing range of sheet lengths (3-5) m corresponds to the required change in the speed of the roller table.

In order that after the braking command the sheets with double thickness do not fall into the rolls of the cage, the thickness gauge is placed at a distance slightly longer than the braking of the electric drive of the roller table.

The braking path S. of the electric motor of the roller table can be represented as

Claims (1)

Claim A sheet rolling method, including measuring the speed of the rolling table, rolling speed and thickness of the rolled sheets, which distinguishes in case of an emergency the speed of the electric table roller motor can increase by 10% above the set allowable working speed (when reaching a speed of more than 10% of the allowable, centrifugal and other types of protections are activated) . Therefore, the braking path s | taking into account a possible increase in speed, it is equal to ^ = k (1,1-p) ^r = 1,2-k'P ⁴ = 1.2 S with the fact that, in order to increase the productivity of the mill by protecting the rolling rolls and other equipment of the stand from damage, an increase in the thickness of the sheets is detected at a distance from the cage, greater than 1.2 ways of braking the roller table, the speed of the feed roller table is set to 0.9-0.95 of the linear speed of the rolls of the cage, and when the sheet thickness exceeds a predetermined value, the mechanisms stop