Steel Ball Coal Mill Manufacturing Process
Release time：2026-02-05
I. Matrix Formation and Reference Standard Preparation
- The core load-bearing components—including the cylinder body, end caps, main bearing housing, and base—have been fully formed in one piece, eliminating residual internal stresses and ensuring a well-defined structural shape with evenly distributed loads.
- Establish a unified assembly reference for the entire machine, and calibrate the rotary centerline, the mounting base surface for the main bearing, and the jointing surface for the cylinder body, ensuring that subsequent assembly references remain unique.
II. Precision Machining of Key Components
- The mounting surface of the main bearing, the flange surface of the end cover, the mating groove at the cylinder body joint, and the shaft neck fitting area are precisely machined, with strict control over geometric tolerances such as concentricity, flatness, and perpendicularity.
- Machine the internal assembly structure of the cylinder body and the positioning areas for the lining plates, ensuring precise alignment and tight fit. Machine the inlet and outlet end structures to guarantee smooth flow and seamless docking.
3. Assembly and Welding of the Cylinder Body
- The cylindrical sections are aligned and corrected according to the reference assembly, with roundness and straightness carefully controlled. The butt-joint forming operation is then carried out to ensure that the weld seams are continuous, dense, and free from uncontrolled deformation.
- The end cover is assembled coaxially with the cylindrical body, and radial and end-face runout are corrected to achieve a rigid connection, thereby forming an integral rotating cylindrical body.
4. Dynamic Balancing of Rotating Components
V. Assembly of the Transmission and Support Systems
- Assemble the main bearing components, adjust the coaxiality and clearance, and ensure stable rotation and smooth operation of the cylinder body’s rotary support.
- Assemble the transmission pair components, adjust the meshing clearance and contact area, and ensure smooth transmission and uniform torque transfer.
- Install feeding and discharging devices and sealing structures, seal off points where powder or air leaks occur, and achieve effective sealing of both stationary and rotating parts.
6. Overall Assembly and Debugging of the Complete Machine
- Assemble step by step in the following sequence: base—main bearing—cylinder assembly—drive system—sealing and accessories; and perform re-inspection of geometric accuracy at each process step.
- Perform a no-load trial run of the entire machine to verify the smoothness of rotation, the engagement condition of the transmission, and the reliability of the seals. Also, identify and eliminate issues such as interference, abnormal noises, and uneven loading.
7. Testing and Factory Protection
- Re-inspect critical dimensions, geometric tolerances, rotary accuracy, and sealing performance, and verify the conformity of the entire machine’s manufacturing.
- Apply protective treatments to the machined surfaces and mating surfaces, complete the overall machine labeling and tidying up, and release the machine for shipment only after it has passed inspection.
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