The Design For U Type Concrete Block Forming Machine And The Study About Its Automatic Control System

The U type Concrete Block is laid in the channel to prevent seepage of water. China is a big agricultural country based on irrigation. The great mass of voluminous water in China is used for irrigation, thereinto mostly for canal. The leakage of canal irrigation is so serious that water resource is badly wasted. The best method to preventing this phenomenon is to lay concrete block at canal. Consequently, the U type Concrete Block is used in channel more and more. But the most is in low production technique and bad automatic conditions, and its quality is worse too. The aim of this Paper is to enhance the automatic level of the U type Concrete Block Forming Machine, and improve its productivity and quality.Performances and characteristics of WZJ-1 model Concrete Component Form machine studied by Mechanical and Electronic Engineering College, Northwest Sci-Tech University of Agriculture and Forestry are ameliorated in this Paper, which makes it become a molding mechanism whose production can be controlled by Programming Logical Controller (PLC), and can be included easily in the block production line.Combining advanced techniques about block production in this and other profession at China or other country, the Paper presents the design for the whole Concrete Block forming production line. The whole line, from the initial materials transported, weighted, lifted, stirred in pug mill and molded in forming machine to the finished product maintained at field, is controlled by PLC, and realizes the automatic production. The Paper presents the trapeziform chart for production line controlled.By analyzing Production-Oriented program, control and communication of PLC, and applying development technique of real-time operation system, Object-Oriented System Design and Direct Manipulation feature, and roundly pondering on the requires of platform design's recycle and expansibility, the communication and monitor system between PLC and PC are devised. Using the modern programming technique--Object-Oriented Paradigm (OOP), the programming language visualC++6.0 and ActiveX mscomm6.0, based on the proprietary corresponding protocol of MITSUBISHI FX2N series, the Paper gives out the communication program for PLC and PC respectively.The forming machine works normally in the actual application. Through simulant debugging, the program of PLC can work normally too, and can realize the objective to product automatically. All program of production line system and control and monitor system are designed for modularization, which comes to the aim largely by the emulational debugging. Each control system is flexible, simple and easy to change.The study of this Paper has actual significance for enhancing the productive level of forming machine and Concrete Block's quality, similarly to its large-scale production, and also establishes the academic base for the development of block production line in the future.