On the crane brake adjustment on the impact of production safety

    Gantry crane on a regular basis during the inspection, found that most companies operating agencies  gantry crane  brake failure is not a brake adjustment request is not standardized. Driving part of the plant maintenance personnel on the hoisting mechanism and operating structure brake adjustment process in mind, often only pay attention to the importance of the brake lifting mechanism, while ignoring the adjustment of the brake operating agencies, just to travel with the driver's operating requirements experience to adjust, so that the brake brake or tight or loose, and even brakes do not work, but by running its own reverse braking or friction to make traffic stops. Little do they know this will pose a significant safety threat.

      Because the brakes are working to ensure safe lifting one of the important parts, directly affect the accuracy and reliability of kinematics, it is working properly or not directly affect the safety of personnel and equipment, so the brakes must always be adjusted according to the standard.
  Because  bridge crane  is intermittent, repetitive work, through the lifting hook or other lifting spreader, down, or lift and transport materials, machinery and equipment. Starting, braking action frequent, severe brake wear leather, not timely or replace the brake master spring compression braking torque is too small will become smaller, while in the adjustment process, brake shoe and brake wheel clearance when open not suitable, will result in:

① When the carts were driven wheels when braking uneven ends on traveling mechanism in starting and braking are not synchronized across the body twist, the occurrence of the phenomenon of eating track, track and wheel rim increased wear and reduce the life of .

② carts (or car) as starting and braking times faster, if the braking distance adjustment is too short to be hanging hook and a corresponding object due to inertia swing amplitude, and thus can not quickly and accurately should fall smoothly parked position, if the oscillation amplitude is too large decoupling or collision will occur.

③ If the braking distance is long or defective brakes are adjusted to the cart (or trolley) of the stroke limiter (security measures in the correct installation) and the end stopper impact. As we all know, stroke limiter and end stops are overhead  hoist crane  safety device to prevent misuse of the driver, making driving run to the parking orbit limit position has not yet set up an accident occurs. Including the installation of safety-foot length is calculated based on the braking distance. When driving run to the limit position, limit switch roller carts foot in contact with the security to make the switch to cut off the power to the motor operating agencies, brake brake to stop running (not yet encountered the end stopper), from the to a security role. If the brake braking distance is too large or failure, it will cause even if the motor is powered off, driving can not be stopped quickly, but with the level of quality of the crane's own inertia force to continue to run until the end of the stopper until the hit, thereby lose protection stroke limiter, while the force of impact will be through the end stops acting on the plant's load-bearing structure, the plant suffered varying degrees of damage to the structure.
      Therefore, hoisting mechanism and operating agencies regulate the brake should be checked regularly to adjust the amount of compression the main spring, brake shoes and brake wheel opened on both sides of the gap should be equal and the gap is not exceeded, check the brake pad wear, brake wheel and the axle pin and whether the freely rotating part of the rotation in order to ensure reliable and safe operation of the crane.