Correct installation method of mill

Date: 2019-07-09 Views:

Good installation can ensure normal operation of the mill, with a longer service life and higher operation rate.

The installation method and sequence of various mills are roughly the same.

Foundation requirements: in order for the mill to operate smoothly and safely, the foundation must extend to a stable and solid foundation layer.The foundation should be able to withstand static load and vibration load generated in the mill operation;The base shall have a chassis and volume large enough to be separated from the workshop column chassis at least 50mm apart.The weight of the foundation should be 1.5 ~ 2 times larger than that of the mill.

Before the installation of the mill, it is necessary to check whether the configuration relationship between the foundation and the building and the adjacent units is correct, whether the elevation of the foundation and the dimensions of the main parts conform to the dimensions specified in the installation diagram of the unit, and at the same time, the construction quality of the foundation should be carefully checked.

If the foundation meets the design requirements, the foundation surface can be cleaned, and loose flotsam on the top of the foundation can be removed with a pneumatic shovel or hand tool, and the foundation center line and elevation at the installation point can be marked.If there is residual grease on the foundation surface, caustic soda and neutralizer should be used, or enough depth should be removed to avoid affecting the adhesion between mortar and foundation.

After the inspection and preparation of the equipment and foundation, the foundation bolts, main bearing chassis and bearing seat, etc. can be installed. The horizontal tolerance of the main bearing chassis is 0.10/1000.The relative elevation of the two chassis should be generally measured with a liquid connector, the height difference should not be larger than 0.5 mm, and make the feeding end higher than the discharging end.The main bearing seat and chassis should be in uniform contact around, local clearance is no more than 0.1 mm.The contact between the sphere of the spindle bush and the sphere of the bearing seat should be good and the rotation must be flexible.Wedge clearance shall be provided around the two mating spheres with an oblique depth of 25 ~ 50 mm and an edge clearance of 0.2 ~ 1.5 mm. The number of contact points on the contact surface shall now be no less than one point per 50×50 mm squared area.When assembling the spindle bush and bearing seat, the ball should be evenly coated with greased with graphite.The distance deviation between the center lines of the two main bearing chassis shall comply with the relevant provisions of the metallurgical equipment installation construction and acceptance code.

When assembling the spindle tile and hollow shaft, the contact surface shall be 70 ~ 90°, and the contact points on the contact surface shall not be less than 2 points per 25×25mm2 area.The sum of the clearance on both sides shall be 0.15% ~ 0.20% of the diameter of the shaft neck.

Cylinder with end cover should be checked before assembling, simplified surface should be flat, along the axis direction should not be greater than simplified 0.1% of the total length of the curve, end face diameter difference between maximum and minimum diameter should not be 0.15% of the architectural cylinder diameter, both ends of the flange alignment and parallel degree of tolerance should comply with the metallurgical department issued, the value of mineral processing equipment installation specification allows.When assembling the cylinder and end cover, the burr flash and paint on the bonding surface should be cleaned, and coated with lead oil. The bonding surface should be in close contact, during which no adjustment gasket should be added.Assemble according to the mark, all locating pins must be loaded, and the bolts should be tightened evenly immediately after qualified.

When the cylinder body and end cover are installed on the main bearing, the axial clearance between the shaft shoulder of the two hollow shafts and the main bearing shall conform to the provisions of the equipment technical documents;The busbar on the two hollow axes should be on the same horizontal plane, and its height difference should not exceed 1 mm, and make the feeding end higher than the discharging end.The center line of the two hollow shafts should be on the same straight line.During installation, check the contact between hollow shaft and bush, which should comply with the installation regulations.

The whole gear ring should be installed on the cylinder first, and then the simplified tube should be installed on the main bearing.The split gear ring should be installed on the main bearing after the cylinder body, and then installed on the simplified tube;Burrs, rust - resistant paint and dirt should be removed before assembly.Gear ring end face and cylinder flange should fit tightly, the gap should not be greater than 0.15 mm.The tooth pitch at the joint of the splicing ring shall meet the requirements of the technical documents of the equipment, and the deviation shall not exceed ±0.005 modulus.Radial ring pulsation, pitch diameter per meter should not exceed 0.35 mm.The end face of the ring should run in a circle with a nodal diameter of no more than 0.35mm per meter.

Linings shall not be arranged in the cylinder body to form a circular gap.When assembling a liner with directional orientation, its orientation and position shall conform to the provisions of the equipment technical documents.The annular gap between end liner and tube liner and hollow shaft liner shall be blocked by wood wedge (wet method), iron wedge or cement (dry method) and other materials.The gap between the liner and liner should not be greater than 15 mm.Bolts fixing lining plates should be padded with gaskets and gaskets to prevent leakage of pulp and powder.The opening of the grate hole in the compartment faces the discharging end.

After the main engine is installed, check and adjust the center line of shaft neck and barrel.Concentric error per meter length is not allowed to exceed 0.25 mm, mill longitudinal and transverse center line deviation should not exceed 3 mm;The elevation deviation shall not exceed 5 mm of soil, and the horizontal tolerance of the non-self-aligning bearing mill shall not exceed 0.10/1000.Finally, install the transmission.The parallelism tolerance between the axis of the drive shaft and the axis of the mill should not exceed 0.15/1000.Large, pinion meshing contact spots along the tooth height should not be less than 40%, along the tooth length should not be less than 50%, and should tend to the middle of the tooth side.The meshing of large and small gears shall meet the relevant requirements for the installation of large gears, and the meshing side clearance shall comply with the installation rules of mineral processing equipment.

When assembling the feeding funnel of dry mill or the feeding tube of wind-swept mill, the contact point shall be sealed well and no dust leakage;When rotary contact is used, the rotation should be flexible.

After the mill is installed, it should run empty (without medium or material) for 8 hours, during which the transmission gear should not make abnormal sound.There shall be no knocking sound on the lining plate;The amplitude of reducer shall not exceed 0.05mm;Transmission shaft amplitude does not exceed 0.08 mm;Main bearing amplitude not exceeding 0.1 mm.The circular movement of the end face of the main bearing shall meet the requirements for installation as described above.After the idling is qualified, carry out the load trial operation.Before starting, the grinding medium of 20% ~ 30% should be installed in the cylinder. After starting, the grinding medium of 10% ~ 25% should be added to the material. After running for 2 hours, the grinding medium should be added until the full load is reached.If all goes well, it can be put into official use.The test run of tube mill should be carried out in accordance with the provisions of equipment technical documents.

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