Ball mill End Cover

Functions

1. Discharge end cover for large-scale mill, mill specification: φ9.7×3.36m, maximum outer diameter of end cover: 10140mm.
2. Material: ZG20Mn, end cover is delivered in 4 halves.
3. Attach technical parameters to the drawing as per user's requirements; production shall commence only after confirmation.

φ9.7×3.36m Semi-Autogenous Mill End Cover

1. The welding standard for welds is GOST 5264-80-Y6, with welding electrode 42 GOST 9467-75. The total length of welds is 14 meters, the weight of surfacing metal is 103 kilograms, and the weld reinforcement on surface П (Zone 3A) shall not exceed 3 mm.
2. Dimensions marked with * are for reference only.
3. Dimensions in boxes marked with two ** shall be machined to match components in drawing 3873.12.000.00 and drawing 3873.13.000.00.
4. Dimensions in boxes marked with three *** shall be machined to match the assembly in drawing 3873.15.000.00.
5. Prior to machining, install all bolts at each joint at positions 4 and 5, and tighten them with a uniform torque of 8790 N·m. The joint area on surface H (Zones 4Б and 6Б) shall be no less than 75%, and the local clearance at connections shall not exceed 0.5 mm.
6. The step difference between the edges of joints on surface П (Zone 3A) shall not exceed 2 mm.
7. Plug No. 3 shall be cut to the measured dimensions obtained on the user's site.
8. The relative position of cross-sections No. 1 and No. 2 at every 4 joints shall be fixed with alignment marks of 0.5-1 mm depth and 80-90 mm length. The number of alignment marks at each joint shall correspond to the joint serial number.
9. Mark "LEFT" and the actual diameter Ф (Zone 4B) × (Zone 3A) on cross-sections 1 and 2 where the end cover mates with the feed hollow shaft (drawing 3873.12.000.00).
Mark "RIGHT" and the actual diameter Ф (Zone 4B) × (Zone 3A) on cross-sections 1 and 2 where the end cover mates with the discharge hollow shaft (drawing 3873.13.000.00).
10. After the combined machining of holes "T" and "Y" (Zone 5B), and prior to disassembly, the relative position of the end cover and hollow shaft assembly shall be fixed on the surface with alignment marks of 0.5-1 mm depth and 80-90 mm length: 
1) Left end cover, mating with the feed hollow shaft of drawing 3873.12.000.00: one alignment mark.
2) Right end cover, mating with the discharge hollow shaft of drawing 3873.13.000.00: two alignment marks.
11. All alignment marks shall be made with visible, indelible paint.
12. The load capacity of each lifting lug is 55 tons.
13. The paint coating shall comply with standard GOST 9032-74: the outer surface is coated with enamel KO-813 (silver) per GOST 11066-74, VI8, 500 hours; the inner surface is coated with enamel ПФ-115 (black) per GOST 6465-76, VII.
14. All assembly and mating surfaces shall be coated with rust preventive oil per Grade I-2, with protection scheme 83-7. The inner packaging shall comply with GOST 9014-78, and storage shall meet the conditions specified in GOST 15150-69. The term for recoating with rust preventive oil is 1 year.
15. The weight marked with four **** excludes the weight of the construction kit (the approximate weight of the construction kit is 675 kg).

The contents of the quarter-end cap drawing  as follows:
1. Dimensions marked with * are for reference only.
2. High-temperature tempering shall be performed after welding of the end cover segments.
3. Welding shall be completed by certified professional welders.
4. The misalignment of the fan-shaped edge on surface П shall not exceed 1.5 mm.
5. The weld reinforcement on surface П shall not exceed 3 mm.
6. Dimensions in parentheses are post-welding dimensions.
7. After electroslag welding, remove the weld protrusion at position H. The residual protrusion from surface M shall not exceed 10 mm.
8. The layout of holes Л and Р shall be coordinated with the hole positions of the mating end cover segments.
9. The distortion of overall dimensions shall not exceed 20 mm.
10. The non-contact gap between the surfaces of adjacent end cover segments shall not exceed 5 mm.
11. Welds shall comply with the standard GOST 15164-69, using welding wire CB08 GOST 2246-60. The weight of welding consumables is 730 kg, and the total weld length is 9.6 m.
12. The load capacity of each lifting lug is 50 tons.
13. Hole C may be manufactured in accordance with this drawing.
14. Mark the drawing number as follows:
1)On the circumference of Ф10000mm, there are 128 holes of Ф60mm.
2)On the circumference of Ф4380mm, there are 48 holes of Ф75mm.
3)On the circumference of Ф4030mm, there are 32 holes of Ф75mm.
4)The above 3 circumferential holes shall not be drilled; the user shall perform match drilling on-site. Only the centerlines need to be marked.
5)Other holes on the end cover shall be implemented in accordance with drawing 3873.11.000.00.СБ.
6)The following change is made to the dimension in drawing 3873.11.000.00.СБ: the connection dimension Ф4540H6 (between the end cover and the discharge hollow shaft) is revised to Ф4542mm.