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Ball mill discharge end cap

This paper elaborates on the ball mill discharge end cover, a key component at the cylinder's discharge end that seals the cylinder, guides ground materials to discharge, prevents leakage of dust and media, and bears partial loads in collaboration with the hollow shaft. It requires strength and toughness, with Q235B and Q355B steel as common materials, featuring a flanged disc structure with a central stepped hole (for hollow shaft connection) and optional internal wear-resistant liners or grid plates.

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Ball Mill Feed end cover

This paper details the ball mill feed end cover, a key component connecting the cylinder and feeding device, which guides materials into the cylinder, seals the cylinder end to prevent dust leakage, and forms a support structure with the hollow shaft. It requires strength and toughness, with Q235B and Q355B steel as common materials, featuring a disc or flanged structure with a central feed port and internal wear-resistant screw blades. The manufacturing process of large Q355B end covers is elaborated, including raw material pretreatment, cutting, forming, rough machining, welding (with post-heat treatment), finish machining (flange surface and feed port processing), and surface treatment. Comprehensive inspection procedures are also outlined, covering raw materials (chemical composition, mechanical properties), welding quality (non-destructive testing), dimensional accuracy (flange flatness, hole position tolerance), and final assembly compatibility and sealing performance tests. These ensure the feed end cover meets operational requirements, with a service life of 8-10 years, supporting stable feeding and sealed operation of the ball mill.

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Ball mill bull gear

This paper elaborates on the ball mill bull gear, a key transmission component that meshes with the pinion to drive the cylinder at low speed (15-30 r/min) under heavy loads (torque up to millions of N·m), with materials like 45# steel, 42CrMo alloy steel, and ZG35CrMo cast steel for different sizes, and split structures (2-4 segments) commonly used for large gears (diameter ≥3m) for easy transportation and installation. It details the manufacturing process of 42CrMo split gears, including blank preparation (forging/cutting), rough machining with assembly, quenching and tempering, finish machining (precision gear hobbing, grinding), and surface treatment. Additionally, it outlines comprehensive inspection procedures covering raw materials (chemical composition, forging quality), heat treatment (hardness, metallographic structure), tooth profile accuracy (pitch deviation, radial runout), and final product tests (assembly accuracy, meshing performance). These ensure the bull gear meets strength, toughness, and precision requirements, enabling stable transmission with efficiency ≥94% and a service life of 3-5 years.

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Ball Mill Main Shaft

This article elaborates on the ball mill shaft, a core component that transmits torque, bears heavy loads (up to thousands of tons), and connects the cylinder and transmission system, with 45# steel and 42CrMo alloy steel as common materials for different sizes. It details the manufacturing process of 42CrMo shafts, including raw material pretreatment, forging, heat treatment (normalizing and quenching-tempering), rough machining, semi-finishing, precision grinding, and assembly. Additionally, it outlines comprehensive inspection procedures covering raw materials (chemical composition, mechanical properties), heat treatment (hardness, metallographic structure), machining accuracy (dimensional and geometric tolerances), and final product tests (surface quality, dynamic balance, hydrostatic test). These ensure the shaft meets strength, toughness, and precision requirements, supporting stable and efficient operation of ball mills.

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Ball Mill Pinion Gear

This article details the ball mill pinion, a core transmission component that meshes with the bull gear to drive the cylinder, requiring high strength, precision, toughness, and wear resistance, with 20CrMnTi as a common material. It outlines its manufacturing process for 20CrMnTi pinions, including blank forging, rough/semi-finishing (turning, hobbing), carburizing heat treatment, precision machining (tooth grinding, datum grinding), and assembly. Additionally, it specifies comprehensive inspection procedures covering raw materials (composition, forging quality), heat treatment (hardness, carburized layer), tooth accuracy (pitch deviation, runout), and final tests (surface quality, meshing performance, dynamic balance). These ensure the pinion meets transmission efficiency (≥95%) and service life (2-3 years) requirements, supporting stable ball mill operation.

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Ball mill cylinder

This paper elaborates on the ball mill cylinder, a core component that holds grinding media and materials, enabling material crushing and mixing through rotation, while withstanding heavy loads (up to thousands of tons). It requires high strength, rigidity, wear resistance, and sealing performance, with Q235B and Q355B steel as common materials, and features a cylindrical structure with wear-resistant liners inside. The manufacturing process of large Q355B cylinders is detailed, including raw material pretreatment, cutting, rolling, welding (longitudinal and circumferential seams), flange assembly, annealing, roundness correction, and surface treatment. Comprehensive inspection processes are also outlined, covering raw materials (chemical composition, mechanical properties), welding quality (non-destructive testing), dimensional accuracy (diameter, roundness, straightness), hydrostatic tests, and final appearance checks. These ensure the cylinder meets operational requirements, with a service life of 8-10 years when combined with wear-resistant liners.

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