Crane Brake Problems and How to Maintenance

BY Dongqi Crane IN Overhead Crane Blog

Crane to regular overhaul and maintenance, especially brake is particularly important!

Double girder <a href=http://www.overhead-crane.org/ target=_blank class=infotextkey>Overhead Crane</a> with brake

Crane brake problems

Brake request check once every shift, often there are several issues as below:

Crane brake

Braking torque decreases, this is because the brake wear, main spring gradually relax or brake bracket of each hinge point to causes such as hole or shaft wear is too large, if the brake wear to half the thickness of the original belt was replaced. The pin shaft wear is more than 5% of the original diameter, ovality to replace more than 1mm, when 5% more than the original aperture, hole wear available reamer reaming, and to make corresponding pin. If the hole wear is very big, can be used after reaming jacketed or pastry processing hole to repair again after welding.
Brake suddenly failure, this may be due to brake is badly worn or take off, long stroke brake core on the bracket or frame, sometimes connection electromagnet and the traction bar connection plate of small shaft slipping out, make a connection plate back down on the frame, sometimes hydraulic push rod pressure on the shell, there is also a spring failure or damage reasons such as brake bracket, the brake can not hold brake wheel and cause, in addition to the replacement and repair the damaged parts, brake should be adjusted.
Brake temperature, braking with smoking, this is mainly due to install is not good. Brake while open sometimes, but there is a brake band never left brake wheel, friction each other at work, make the temperature of the brake wheel short time up to 300 ~ 400 degree, brake with smoking, should timely adjust the brake the brake wheel brake surface parallel. Sometimes in summer in the high temperature workshop work continuously the lifting mechanism of brake wheel, also can appear the high temperature situation, should be timely to cool, the rise of temperature of the brake wheel used in crane, generally no higher than the environment temperature of 120 degree, the surface temperature of the winter (below zero 20 degree) -- it is usually below 50 degree, the best cooling method, high temperature brake wheel of empty hook hoisting mechanism in running a quadratic limit scope, from 300 to 400 to around 70 (environmental temperature around 20 degree), should be paid attention to in the high temperature when the brake tight brake, after cooling may become very loose, need to adjust the brake.
Brake can't open it, often because of the hinge point card death cannot turn the main spring force is too large, hydraulic push rod hydraulic solenoid or lack of oil or air in cylinder no is put, coil burned or rectifier component, there is something wrong with the line, the voltage is too low, after find out the reason, should be timely repair. Braking of each hinge point application of thin oil pouring once a week, make its can reduce wear and flexible rotation.

Double girder gantry crane with brak

The maintenance of the crane brake

Crane brake of the articulated point should according to the lubrication condition on a regular basis, at least once every other week lubrication, working under the environment of high temperature lubrication once every three days, lubrication can not dip lubricating oil friction to the brake lining or brake wheel surface.

Keep clear of in time between the brake lining and brake wheel grime.

Hydraulic push rod segment or brake drive the oil change once every six months. If discover oil with mechanical impurities, the device should be opened entirely, wash the parts with gasoline, and then to assemble, sealing ring should be taken before assembly with clean oil infiltration, to ensure the sealing performance after installation. But when cleaning, the coil is not allowed to clean with gasoline.