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The steel pre-treatment line process refers to the treatment process in which the surface of steel is descaled using shot blasting before processing (i.e., in its raw state), and a protective primer is applied. Pre-treatment of steel can enhance the corrosion resistance of mechanical products and metal components, improve the fatigue resistance of steel plates, and extend their service life ； It can also optimize the surface treatment condition of the steel, which is beneficial for cutting and precise material removal using CNC cutters. Furthermore, since the shape of the steel is relatively regular before processing, which facilitates mechanical rust removal and automated painting, preprocessing the steel can **improve the efficiency of cleaning tasks, reduce the physical strain associated with these tasks, and minimize environmental pollution. In recent years, the degree of automation of equipment has been further improved thanks to the use of programmable controllers for control. With the rapid progress of science and technology, computers and automatic measurement and control instruments are widely used in the machinery manufacturing industry; tasks that were impossible to accomplish just a few decades ago are now easy to carry out. Temperature transmitters, rotary encoders, and other components are used on the steel pretreatment line. The entire line is under computer monitoring (via a control center, replacing the old analog screens), as well as CCTV surveillance. Additionally, automatic coding devices and automatic barcode printing systems can be installed according to the user’s requirements. The application of high-tech products such as computers in mechanical products is an inevitable trend. Fully automatic pre-treatment line monitoring system for steel plate profiles; Workpiece conveying system: 1. The workpiece conveying system features variable-frequency stepless speed control, allowing each unit to operate either synchronously or independently. 2. The rollers in the shot blasting chamber are equipped with wear-resistant sleeves made of special materials. 3. The plate chain conveyor has a “V”-shaped structure; this design ensures short contact between the steel plates after painting, thereby preventing damage to the paint coating. Shot blasting cleaning: 1. The height of the workpiece is measured using photoelectric switches and brake motors, located outside the shot blasting chamber to prevent interference from dust. 2 Workpiece width measurement device, with automatic adjustment of the number of blast gate openings. 3 Advanced cantilever centrifugal shot blasting machines are used, and their placement is determined through computer simulation. The pellets avoid the roller conveyor, ensuring even coverage of the workpiece. Shot cleaning: 1. Rolling sweep, side sweep, and high-pressure air blowout. Shot recycling and purification: 1. A full-curtain air separation device is used; 2. Special polyester core conveyor belts are employed; 3. An air-controlled shot controller is used; 4. Fault alarm functions are provided at all power points of the shot recycling system. Shot blasting and dust removal system: 1. An integrated cyclone and bag filter is used, ensuring that dust emissions meet ** standards. Painting booth: 1. Two high-pressure airless painting pumps are used, with one serving as a backup; 2. Standard linear guide rails are used to support the cart, with variable-frequency buffering at both ends of its travel range; 3. The workpiece inspection and transmission mechanisms are separated from the paint gun, eliminating paint mist interference and facilitating the removal of paint residue. Drying chamber: 1. Various types of heating elements (or burners) can be used, along with hot air circulation to ensure optimal use of heat. 2. The temperature of the drying chamber can be adjusted between 40 and 70 degrees. It is equipped with a paint mist filtration system as well as a device for purifying harmful gases. 1. Advanced paint mist filtration cotton is used to filter paint mist. 2. Activated carbon is used to absorb harmful gases. Electrical control system: 1. Controlled by PLC, with dynamic simulation and monitoring via a computer. 2. Fault alarm function for the circulation system. 3. Function for tracking the cumulative usage time of wearable parts. Customers in rainy areas in the south and the northeast region require preheating devices (available in various types such as electric heating, far-infrared heating, gas heating, and fuel heating); the same applies to drying processes. Regarding the operating speed of the preprocessing line.