Xiangbo Ze

Continuously Sintering Furnace Temperature Control System Based on Intelligent PID Adjustment

To meet the demands of temperature control accuracy in continuously sintering furnace with multiple hearths, this system was constituted with PC, XMT624 and solid state relay for temperature field control. According to the characteristics of heating process, temperature inertia, lag of sintering furnace, adopted intelligent PID algorithm to achieve the large-scale temperature adjustments, it overcomes the limitation of traditional PID control. Through online setting intelligent instrument unit realtimely, the system achieves the target of temperature control accuracy in 2degC per thousand centigrade.

Analysis of Flow Field in Vertical Roller Mill Chamber Based on Turbulent Models

Mixture multiphase flow model and several common turbulent models of the computational fluid dynamics (CFD) are chose. According to the two-phase turbulent coupling characteristic of powder, hot-air flow field and the operation data of the vertical roller mill chamber, it analyzed three-dimensional flow of the chamber using standard turbulent model, RNG turbulent model and Reynolds stress equation model (RSM). The results show that high pressure flow region enhancing separation efficiency is formed between the wall surface of chamber and the side of table. High speed flow in the end of the high pressure region improves the transportation efficiency of powder. The chamber internal flow field has part turbulent anisotropy. Especially, turbulent pulse between the table and gray bucket is significant.

Research and Development for Technology Evolution Potential Forecasting System

Technology forecasting is a powerful weapon for many enterprises to gain an animate future. Evolutionary potential radar plot is a necessary step of some valuable methods to help the technology managers with right technical strategy. A software system for Technology Evolution Potential Forecasting (TEPF) with automatic radar plot drawing is introduced in this paper. The framework of the system and the date structure describing the concrete evolution pattern are illustrated in details. And the algorithm for radar plot drawing is researched. It is proved that the TEPF system is an effective tool during the technology strategy analyzing process with a referenced case study.

The CNC development of the sawing and milling machining center for plastic door and window PVC profile based on Fanuc0

By developing secondly FANUC - OMD system, the control system accorded with requirements of the sawing and milling machining center for plastic door and window PVC (polyvinyl chloride) profile is accomplished. Based on researching the structure, the function, the process of the technologies and the control requirements of the machining center, had implemented the CNC (computer numerical control)system of the machining center, these include the machine tool origin and work piece coordinate origin established. Completed the sawing and milling machining center auxiliary functional code - M code development, realized assistant functions of the automatic control processing. Through parameter adjustment and simulation experiment, meet to the sawing and milling machining center control requirements.

Dynamic Analysis of Tip Set Extra Hard Load of Vertical Shaft Impact Crusher

Rotor is the major work components of Vertical Shaft Impact Crusher and tip set extra hard is the most wearing part of it. Based on the analysis of the structure and the working principles of the Vertical Shaft Impact Crusher, we set up the three-dimensional model of the rotor in Solid Works. Through the importation of the 3-D model into ADAMS for the dynamic simulation, we simulate the throwing process of the materials when the crusher is in operation, then gain the variation of the biggest and average impact force suffered by the tip set extra hard of rotor at different spindle speed. Simulation analysis shows that the speed of the rotor is an important factor that impacts the crushing quality and efficiency of the vertical shaft impact crusher, but the crushing effect is not always rising with the speed increasing and high speed would aggravate the wear and tear of tip set extra hard .The speed range of the rotor is from 1400 to 1500 rpm or from 1600 to 1750 rpm, between which the tip set extra hard suffers balanced force and can operate stably. In addition, in order to fully take into account the crusher broken quality, efficiency and service life, reducing the value and frequency of the greatest impact is of vital important, for one thing, the rotor structure and the optimization of the relevant parameters need to be taken into consideration, for another thing, the impact of the of uniformity of the feed particle size should also be analyzed.

Mechanical Structure and Motion Control System Design for Continuously Sintering Furnace

With the Industrialization of MIM technology, it is urgent to resolve the waste of energy problem, which is caused by the parts’ repeated heating in degreasing, sintering segment. So, it is proposed that by the use of the continuously sintering furnace to make the traditional single process (such as degreasing process, sintering process and post-processing, etc.) merge into the integrated process; designed the sintering furnace motion control system by S7-200 PLC (Programmable Logical Controller). And then, introduced the structural design and the control system design of the sintering furnace in detail. The successful development of the continuously sintering furnace will significantly reduce the various uncertain factors during the produce process, which will help improve the quality of forming parts and production rate.

Rearrange and Reform of Product Line Based on Computer Simulation Technology

The novelty method is used for analyses and diagnoses of product line. The virtual design and modeling method are introduced through the real case. In simulation environment, it showed that there were some bottle-neck processes because of defective manufacturing technology. After produce line rebuilt in simulation, the average manufacturing technology time was about 41.2s. The utility ratio of machines and productivity of workers trended to average, and the bottle-neck processes are solved quickly through visual simulation and adjusting the manufacturing technology. So this method can design, analyze and rebuild the produce line rapidly. It is the predictable analyses way for manufacturing programming of product in order to response the market and satisfy the individuation requirement of client.

The CAM system research of sawing and milling machining center for PVC profile based on feature technologies

By using the flexible sawing and milling machining center for plastic door and window PVC profile (SMMC) as an object, the paper approach for the basic frame, the main function and the key technology of the relevant CAD/CAM integrating system for the SMMC, and specify fully the feature technologies which are applied to the technical design for the SMMC. Through in-depth studying the geometric character, the technical character and the mutual relation between them which various windows shape on the structure and the machining figuration are possessed of. We gained the feature subclasses aggregate and the individual of the feature subclasses aggregate of the machining technological of windows shape. Consequently, such feature technologies in the flexible sawing and milling machining center for plastic door and window PVC profile system can greatly improve manufacturing efficiency and quality.

Finite Element Analysis and Checking of LD-A Type Crane Girder

The structure of LD-A style crane girder is analyzed by conventional mechanics method. According to the parameters of weld structures, restriction parts and the relevant components of girder, the girder is simplified. Then 3-D girder model is established by SolidWorks software and it is carried out nonlinear static finite element analysis and dynamic frequency analysis in the use of COSMOSWorks embedded in the SolidWorks. Based on the law of Newton Raphson iterative process and limit analysis principle, the paper has analyzed the end-loaded and mid-span-loaded girder model under the largest load. The results show that the maximum nodal stress is 103MPa at the restriction side of girder and the maximum bend distortion is 5.304mm in the neutral area of girder model. The first-order full loaded natural frequency is 10.953Hz. Finally, according to mechanics allowance of mechanical engineering and the requirements of structural dynamic frequency under the largest load, this paper has checked the finite element analysis results of girder model to confirm the feasibility of original girder structure design.

Research on precise locating control of large inertia ball mill

To solve the problem of difficulty in precise locating of batch ball mill, the kinetic model was build, and parameters relationship between starting and shutting down were analyzed, control system was designed. At the stage of starting of ball mill, load torque, rotary inertia and so on could be acquired. Based on the relationship of ball mill kinetic parameters between starting and shutting off, parameters at the stage of shutting off could be predicted. With these parameters, the angle that the ball mill would roll after power off could be predicted. With the angle, the optimum spot to cut off power of ball mill could be find, and precise locating and stopping of ball mill could be implemented. The control system is simple in structure, easy for installation and suitable for the reconstruction of existing ball mills control.