Introduction to 2019 - mine reducer remanufacturing technology
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Peak of 22 Cai Chao yu-ping wei li gang reducer as the core component of coal transportation equipment, relatively complicated structure, high professional requirements, high added value.
Under the current coal mine is in a state of weak form, the speed reducer to use standard after maintenance, energy saving material, and can reduce equipment procurement funds, improve the economic benefit of coal mine.
Reducer maintenance remanufacturing mainly include: housing, bearing, gear shaft parts.
A mine reducer, casing repair remanufacturing because its use conditions, the surface will produce a wide range of corrosion, before reducer devanning generally adopt sandblasting, removing the surface area of carbon, corrosion, and the original paint.
Generally in mine reducer in use process, due to the input shaft coupling error in the installation process is easy to cause the input shaft of the additional radial force, in the process of long-term use, due to the reason of the radial force bearing outer ring and housing bearing hole in relative motion, so as to make the casting casing wear out-of-tolerance holes.
Generally remanufacturing reducer after removal to the whole case to measure the bearing hole, for the ultra poor bearing hole to repair.
Bearing hole repair methods mainly include two categories: for small error range, generally adopt the electric brush plating solution, uniform bearing hole of brush plating to drawing size and manual polishing.
For larger error range, generally adopt split processing enclosure, combined with casing box for boring to the required size.
Second, the bearing and bearing failure determination is the core of the reducer in the support rotary parts, its accuracy is high, before the reducer remanufacturing, need to fully understand the reducer using the time, to use time more than bearing design life time, bearing must be replaced.
For within the scope of the service life of the time, if the bearing inner and outer ring, cage, roller peeling, agglutination, fracture, plastic deformation also must to replace bearing.
In addition to the above situation generally use cases for a long time, bearing fatigue wear is seen, for bearing inner ring, the orbital plane is not allowed to appear dim and shape change obviously.
Bearing roller, orbit, cage allowed early pitting, but on average, does not allow more than 1 mm in diameter, depth does not allow more than 0.
1 mm, pitting area does not allow more than 20% of child.
Bearing still need according to the bearing standard to measure the corresponding clearance, clearance error is too large will directly affect the stability of gears transmission, also need to be replaced.
To use standard bearing, the corresponding cleaning can be used again after cleaning.
Three, the axial parts of the gear failure judgement and maintenance of remanufacturing shaft parts of the gear is the key to the gear reducer remanufacturing.
Gear box in the process of long-term use of gear shaft, besides a corrosion problems such as tooth ministries: wear, agglutination, pitting and spalling, plastic deformation, fracture, crack, and so on and so forth.
Plastic deformation, fracture and crack need to check whether can be adjusted, in ensuring long tooth height and tooth direction of contact area of not less than 65% of cases, adjust the installation position of gear tooth parts, can increase the components of repeated use, reduce the cost of repair.
In maintenance, can be appropriately use tooth surface wear parts, but wear is no more than 1/10 of the deep carburizing and quenching layer.
For tooth surface slight glue phenomenon, gluing area shall not be greater than high tooth width of a quarter.
For tooth surface appear early pitting, modulus under 6, pitting the average shall not be greater than 1 mm in diameter, module more than 6, pitting average diameter shall not be greater than 2 mm, pitting area cannot be more than 1/5 high effective contact area of tooth, tooth length.
With regard to severe tooth tooth surface rust parts, after the distribution of tooth parts to allowance for tooth surface of fine grinding, increase the availability of spare parts.
Four, the rest of the small maintenance of remanufacturing for gearbox fasteners, according to remove the case may be.
Gear box oil system of waterway removable after pickling, replace the corresponding pipe joint, suppress used again after repair welding.
Five, the remanufacturing of gearbox assembly and maintenance of remanufacturing of gear box in assembly time bevel gear pair can be appropriately enlarged the gear clearance, axial clearance for reference of each bearing clearance standards.
For gear box remanufacturing after commissioning, maintenance can be carried out in accordance with the coal industry of the corresponding standard, the no-load and load experiments.
In the process of loading needs to notice to observe temperature rise and noise.
Source: 'China science and technology expo 2018, 04
