As we all know: To obtain a good cast billet quality, not only the vibrating table itself has a reasonable design structure, but it is also very important to have a great relationship with the motion curve of the vibrating table. Good slab surface quality requires:
• Longer positive slip time is conducive to improving the lubrication conditions of the mold and reducing leakage accidents;
• A short negative slip time can effectively reduce the depth of vibration marks on the surface of the cast slab and improve the surface quality of the cast slab, which is very beneficial for casting round billets and alloy steel.
According to this requirement, the traditional sinusoidal vibration cannot be satisfied, while the non-sinusoidal vibration can achieve this goal. At present, the driving methods that can achieve non-sinusoidal vibration curves on the market are mainly: hydraulic servo drive and electric cylinder servo drive, but these two types of vibration drive equipment have advantages and disadvantages. Hydraulic vibration has higher requirements for media management; the maintenance cost of servo electric cylinder equipment is higher. Our company uses its own scientific research strength to independently research and develop a large torque direct drive motor with independent intellectual property rights, and directly drives the vibration table to achieve a non-sinusoidal vibration curve.
Renewal of vibration drive structure
The traditional mold adopts the driving mode of AC asynchronous motor + reducer + eccentric shaft sleeve
Direct drive by electric motor saves the transition part of the reducer, making the equipment simpler and more convenient for maintenance.
Brand new vibration drive technology
The advanced mathematical model is used to realize the online, seamless and smooth switching of sine and non-sine curves of various angles. This mathematical model has obtained a national invention patent.
Using advanced control algorithms, the vibration curve is smoother, and the negative slip time can be ensured while effectively reducing the number of vibrations at high pulling speeds. Corresponding vibration curves can be generated for different steel grades.
Technical features: 1. The mechanical structure is very simple. It only needs to optimize the vibrating arm when applied to the full leaf spring vibration. At the same time, a direct drive motor is used to replace the original motor and gear reducer. The equipment is very reliable in operation, simple in maintenance and can save a lot, especially suitable for the modification of the leaf spring vibration frame, and it is also suitable for the four-link vibration frame. 2. The vibration is stable, the output torque is large, the impact resistance is strong, the load capacity is large, and the maintenance is simple and convenient. 3. The motion control system adopts a motion controller + drive controller structure, which can be integrated in the PLC control system. A variety of process curves can be selected online, real-time switching between sine and non-sine can be realized, and the vibration frequency can be adjusted in real time according to the pulling speed. The figure below shows the vibration curve of the vibrating end measured by a displacement sensor with an accuracy of 0.002mm.
Direct drive motor drive parameters 4. Main process parameters: Power: 380VAC, 16KW Output torque: 300N.M Vibration frequency: changes with process parameters Amplitude: meet various process requirements (online amplitude adjustable mode is being developed) Cooling method: water cooling.
5. Typical customers: Fujian Sanming Steel Plant, Shandong Shiheng, Kunyu, Hebei Jingye, Wu'an Yuhua, Zhuhai Yueyufeng, Heilongjiang Jianlong Acheng Steel, Hebei Xinjin.
Practical application effect: the surface quality of the cast slab has been significantly improved.
