Traditionally, tundish car lifting structure adopts 4 oil cylinders (or screw rod) for driving, but the screw rod is limited because it needs high processing accuracy, currently hydraulic driving is popular. The problem for 4 cylinders tundish car is non-synchronization while lifting, most of steel factories got worse result after using it, and evenly it can not work. So many CCM company adopted some improvement measures, such as synchronous motor, synchronous cylinder, imported lifting cylinder with displacement sensor and other technical measures, which only got little effects, but the non-synchronization problem still could not be solved.

The tundish car developed by Xinzhong, simplified 4 lifting cylinders to 2 cylinders, which successfully solved the above problem. 2 cylinders tundish car doesn't needs synchronous cylinder, synchronous motor, imported cylinder and displacement sensor, only needs to set a throttle valve in hydraulic pipeline. This tundish car has been used in many 4-strand, 5-strand, 6-strand, 7-strand and 8-strand CCM, and there is no non-synchronization lifting, which has got all the users' praise.

The friction of shaft mounted on four bars and half leaf spring during long time running is the main reason of oscillation device deflection, only using leaf spring to replace bars can solve this problem. With many years practical experience, Shanghai Xinzhong developed full leaf spring oscillation device with independent intellectual property rights, and it has been successfully used in HangZhou Steel, Angang, ChangJiang Steel and other steel factory CCM．

In sinusoidal oscillating model, only using high frequency low oscillating can reduce oscillating mark and improve products surface quality, but if the oscillating frequency is too high, it can increase impulsion to equipment and reduce life time, the equipment stability also will be affected. Adopting non-sin oscillation can reduce oscillating mark and lower the oscillating frequency. After many years technology developing by Shanghai Xinzhong, the following non-sin oscillating has been successfully developed:

•  Mechanical oval gear non-sin oscillation
•  Servo motor non-sin oscillation
•  Digital electric cylinder non-sin oscillation

Above non-sin oscillation has been adopted in many domestic CCM.

Mechanical oval gear non-sin oscillation and servo motor non-sin oscillation are mainly suitable for old CCM modification, only implementing partial modification on old oscillating device to achieve oscillation, but oscillating stroke adjustment is limited.

Digital electric cylinder non-sin oscillation is suitable for various work situation of billet and round CCM
Main parameter is as following:

Rigid dummy bar storage device has three kinds of structure: rack actuating, friction actuating and air cylinder actuating. All the three kinds were used in domestic CCM, according to the using time it can be divided to first generation, second generation and third generation rigid dummy bar storage device.

Rigid dummy bar storage device has three kinds of structure: rack actuating, friction actuating and air cylinder actuating. All the three kinds were used in domestic CCM, according to the using time it can be divided to first generation, second generation and third generation rigid dummy bar storage device.

Because the friction actuating adopts same actuating device same with withdrawal & straightening machine, which can keeps synchronism well with withdrawal and straightening machine without gear and rack collision, but it's inconvenient to adjust and maintain the used butterfly spring structure, and the slipping problem can not be avoided, which will affect the production. This structure is too complex and it's of high cost.

Air cylinder driving dummy bar storage device adopts hook connected with air cylinder to get back dummy bar, which avoided slipping problem and could keep synchronism well with withdrawal and straightening machine, it improved work stability, and the whole equipment structure is simple and utility.

Before 2005, all the rigid dummy bar billet CCM of Shanghai Xinzhong used friction actuating structure (totally 12 sets), and all were changed to air cylinder driving structure after 2005 (totally 28 sets), many users have these two kinds (Such as KunMing Steel, YuXi Steel, HongHe Steel, AnTai Steel etc.), all of them bought friction actuating CCM, then modified it to air cylinder driving type, the optimization is effective and it'd highly praised by all the users.

As the power source of CCM continuous running, the withdrawal and straightening machine also undertakes the product straightening, it's the core equipment of CCM, and because it directly contacts high temperature casting billet and works in extreme condition, the high temperature can damage the withdrawal and straightening machine actuating device (motor, speed reducer), lead frame deformation, affect rollers arrangement, lower product quality and so on. The withdrawal and straightening machine is directly connected with water pipe, cable, hydraulic pipe and lubricating pipe, so it will hinder the CCM operating rate improvement if there is frequent maintenance and replacement.

Shanghai Xinzhong adopts direct water cooling for all the high temperature parts and developed unique full water cooling clamp structure continuous withdrawal and straightening machine (Xinzhong patent), its cooling and equipment protection measures includes following 5 points:

•  inner water cooling for withdrawal and straightening machine frame
inner water cooling for withdrawal and straightening roller body
•  inner water cooling for withdrawal and straightening bearing pedestal
•  water box type cooling for actuating speed reducer
•  with heat resistance cover for water cooling structure

After implemented above measures, it completely improved the working conditions of withdrawal and straightening equipments. For example, workers can contact the machine directly while casting.

More than 10 sets of CCM production experience proved that this structure prolonged the working life of withdrawal and straightening machine, such as main machine (including machine frame, rollers and actuating device), normally the life time can be 1.5~2 years, compared with other domestic similar equipments, it's of obvious advantages.

The improvement of withdrawal and straightening machine working stability is not only for reducing maintenance workload and cost, long time safe, stable, reliable work condition is the most important for continuous straightening, and it also highly improved casting product quality.