Digital hydraulic drive control system for online width adjustment of slab mould

Today's production of iron and steel industry in order to meet the user's different needs and need to constantly changing product specifications, thus replacing mold will decrease the operation rate of a continuous casting machine, influence the production rhythm, resulting in increased production costs. And the crystallization on-line width control system can be under the premise of changing mould, by online adjustment of the mold width, different specifications of the billet uninterrupted production, avoid the frequent replacement of the mold, improve the work rate of the continuous casting machine, to realize the multi specification and small batch user demand.

AEMETEC by itself to have the world's leading industrial digital transmission technology, first proposed digital caster line width adjustable automatic control system, makes the system avoids using the problems of the hydraulic servo technology, not only makes the technique easily be realized, at the same time, low investment and maintenance, greatly reducing the use difficulty, has become a necessary choice for the upgrading of the continuous casting machine, to win the necessary means for Chinese iron and steel industry compete with foreign counterparts.

With the change of market economy, method of single species of mass production has been increasingly unable to meet the flexible market needs. According to the contract production, meet the variety and small batch requirements, is a basic principle of modern production enterprise. To meet this requirement, the slab line width technology has increasingly shown its superiority. Baosteel slab line width of frequent use (more than 10 times a day), not only to improve the continuous casting heats, but also to meet the changing needs of the market, has brought considerable economic benefits, and improve the market competition ability. Existing slab continuous casting machine most are manual shutdown width, troublesome operation; imported equipment mostly adopts the hand DC electric machine width, photoelectric pulse loop control, and also need to ensure that both sides of slow synchronization adjustment, not only technical difficulty is high, and the price is more expensive, multi fault, low precision, wide adjustable speed is not easy to arbitrarily set.

AEMETEC launched the full digital hydraulic control technology, can be very convenient for users to carry out the control of the width of the online slab. Its working principle is that the existing motor switch to digital hydraulic motor, digital hydraulic motor can be receiving computer or PLC given digital signal can be directly set the width adjustment of digital hydraulic motor motion speed and quantity. Because the digital hydraulic motor is installed at the left and right sides of the mould to receive the same digital signal, the synchronous adjustment of the two sides of the mould is ensured, and the center deviation is avoided. For example, from 1500 mm to 1450 mm slab, each side needs to adjust 25 mm. General regulation about 9 millimeters per minute speed, if the pulse equivalent to 0.01 mm, you only need to the computer or PLC pulse number is set to 2500, pulse frequency setting is 15Hz, per second crystallizer width decrease 0.15 mm, 166 seconds after slab is automatically adjusted to 1450 mm width, the adjustment process very stable and synchronous. In this way, can also fill the gap and a mechanical error correction and error correction to fine tune the width of slab midline shift, very convenient and flexible. As shown in 1 cases.

Above method can be used for the reform of the existing mechanical width adjusting device, the new system can use more simple method, such as picture 2: only need to increase 4 sets of digital hydraulic cylinder, pulse equivalent to 0.01 mm, all control method with above same alike.