Barite Milling

Barite Milling

 Repair process analysis of grinding wheel hub of Barite Milling Machine

Repair process analysis of grinding wheel hub of Barite Milling Machine

1, traditional repair mode analysis

Once the wheel hub of vertical grinding wear phenomenon, the current commonly used for the field padded copper, local welding or off-line surfacing method to solve. But the fact proves that it is difficult to guarantee the service life of the equipment by adding copper pad and local welding, and the probability of re-damage is very high. The reason is that it can not guarantee the sufficiently effective mating surface, resulting in scattered stress points and excessive local stress, metal fatigue deformation and then cause re-damage; return to the factory repair although relatively high precision, but the cycle is long (usually no less than 15 days), which has a greater impact on production. Moreover, the cost of off-line repair, which involves air gouging, metal flaw detection, metal composition analysis, welding materials and transportation and hoisting, is close to hundreds of thousands of yuan.

2, on-site repair mode analysis

In recent years, the field repair mode is a rising maintenance mode. Its principle is to use polymer composite material repair technology combined with corresponding parts as the repair surface on the premise of not disassembling the equipment. The bond bonding force formed by the cured polymer composites for repairing makes it form excellent adhesion with the repaired metal parts. The excellent compressive strength of the polymer composites can meet the requirements of the equipment to withstand various composite forces in operation.

Site repair process steps

  • 1. Oxygen-acetylene flame was used to bake oil on the worn surface of the wheel hub, and the oil which penetrated into the metal was baked until there was no spark.
  • 2. Weld the locating points on the worn wheel hub surface and determine the positioning height with the template ruler.
  • 3. Surface grinding or sandblasting to ensure rough surface and no impurities.
  • 4. Air test roll sleeve, check whether the height of the positioning point and its axial preload size are within the design range.
  • 5. wash the surface of the hub with acetone or absolute alcohol to ensure that the surface is clean, dry and strong.
  • 6.Remove impurities and rust on the inner surface of the roller sleeve, and dry it with 803 stripping agent after wiping it with absolute alcohol.
  • 7. in strict accordance with the proportion of Barite Milling Machine material to be reconciled to the same color, no color difference until;
  • 8. Apply the blended special material for Barite Milling Machine on the worn surface of wheel hub, and make sure that the special material for Barite Milling Machine adheres to the metal surface, until the coating thickness is slightly higher than the wear size.
  • 9. Install the fastening roller sleeve and ensure that the excess material is extruded.
  • 10. heating and curing;
  • 11. After curing, the excess material extruded from the bottom of the roller is removed and tightened according to the designed torque.

The wear of the hub of the grinding roller of the Barite Milling Machine repaired reached 1 mm on one side. According to the requirement of the shutdown of the mill, the repair work was completed in only 6 hours.