Threaded connection bridge crane demolition methods and precautions

 Removing the threaded connection. Threaded connection in the mechanical connection is the most widely, it has a simple, easy to adjust and multiple disassembly and assembly advantages.steel crane Its removal easier, but also often due to inadequate attention, improper selection tools, demolition method is not correct and cause damage. Bridge crane screwed General demolition method is:
     First, recognize the thread rotation, use the right tools (wrench, screwdriver sizes match), forced to be uniform. Remove threaded connections generally should not use an extension, only by the force of the special threaded parts, the use of specialized forging wrench, allows the use of extensions. To reduce labor intensity and improve work efficiency, should be adopted motorized wrench. Use special wrench to remove the stud.overhead bridge crane Special circumstances Removing the threaded connections:

1 decapitated screw off the surface and below the body disassembly:

a. the screw drilled into polygonal hardened steel, then screw extruder;

b. decapitated end of the center in drilling, tapping reverse threaded screw screwed into reverse spin out;

c. the screw holes (diameter equivalent to minor diameter), with the same specifications tap tapping; drilling large diameter threaded equivalent, attack large a diameter thread.

2 decapitated screws exposed on the outer surface of the body part of the demolition:

a. at the head sawed off groove with a screwdriver screwed out;overhead gantry crane migraine processed in off the head or square head with a wrench;

b. increase in off the head or nut welded curved rod out;

c. screws thick, use a flat shovel circumferentially excised.