Crane brake selection requirements

In the daily special equipment inspection and testing work, often come into contact with the  hoist crane  brake, brake device's configuration meet the actual relationship to the life of the equipment and the use of safety. Crane commonly used standard series brake device has electro-hydraulic block brake, electromagnetic brake blocks, disc brakes, band brake, with its selection generally consider type, size, and be checked checking, taking into account the use of the environment, etc. relevant factors.

    In order to alleviate the wear on the brakes, the brake excessive alleviate the impact and vibration, it is recommended to support the brake and controlling the brake and use. Braking is generally electric braking control, such as regenerative braking, reverse braking, braking and eddy current braking. Electric braking is used only dissipate the kinetic energy, so that institutions safe deceleration. With electric braking when used to support the brake shall be solely to meet the minimum safety factor of the original regulations. Secondary brake can also be used to reduce wear and impact, dissipate the kinetic energy for the first braking, deceleration and stop the mechanical safety, and the second brake to ensure the safety of the brake support, such as for wind braking. National standards: For hook  bridge crane, hoisting mechanism when working level equal to or higher than the M4 and the rated lifting speed is equal to or higher than 5m/min should be used when electrical braking methods to ensure 0.2-1.0 times the rated capacity in fall within the scope of the load, the speed of the motor before the brake is reduced to 1.3 or less synchronous speed. Conventional standard brakes work environment may not have flammable, explosive and corrosive gases, such as environmental conditions exceed the relevant provisions should be used in explosion-proof type brakes.

    Brake specifications determined, in order to ensure the brake or brakes can effectively support the load and avoid braking distance is too long or too much impact braking, the brake mechanism should be checked average deceleration, braking time, the system moving distance. Different equipment used in different conditions, the relevant standard for the appropriate agency, the average deceleration, braking time and braking distance are made clear. For vertical brake Brake and frequently used in a high temperature environment should be heat checking the brakes,bridge gantry crane the brake test at the maximum allowable temperature is greater than the heat of the heat generated during braking, in order to avoid overheating damage or failure of the friction surface .