Maintenance crane brakes, what aspects should be considered?

      Electric hoist gantry crane  brake common defects are: brake wheel wear, brake band or brake pad wear, hinge lever system pin point hole to expand, pin wear, deformation and force transmission lever fastener wear.

        Brake band wear 超过 2 ~ 3mm, should be replaced. Electric hoist  overhead gantry crane  wear is not excessive, should focus on checking the brake with the brake pads fixed on the case. If found exposed rivets should be buried it. Brake band brake shoe must fit closely, not a partial disability.

        Brake wheel brake arm overhaul points are: the elimination of the hinge point hole clearance, replace worn pins, repair lever system must ensure that the fit tolerance requirements.

        Use reamer reamer, you must ensure that the new bore hole diameter 15% larger than the original. Meanwhile, with the pin reamer should be replaced accordingly. If the hinge point bore wear too large, can be affixed to weld reinforcement plate after processing. Pin worn more than 5% of the original diameter and must be replaced.

      bridge gantry crane  On the brake lever and pull the lever deflection plates and other parts, it is necessary to use after straightening. Generally small fasteners should all be replaced. Do not use non-conforming size washer. Not prohibited in the case of gasket used alone cotter pin.

       Assembled brake repair and must ensure that: each rod lever system can be relatively free movement, balanced smooth, no obstruction; brake band and brake shoe snug fit sizes to meet the requirements; brake is released, the brake wheel and the gap between the brake band not less than 0.25mm. For the 100-200mm brake wheel, the standard gap of 0.5mm: 200-400mm for Rural brake wheel, the standard clearance of 1.0mm. The gap is too large, the braking torque is difficult to guarantee; gap is too small, it will cause the brake shoe bite plug.

      Hoisting mechanism and luffing mechanism braking torque should be able to reach 1.85-2 times the rated braking torque. Adjust brake requirements are: brake shoe hold, the solenoid still not less than 15% of the total stroke travel back to accommodate the need for using the adjustment process. After adjusting the brake overhaul, after passing the test stand can be delivered.