Rotary Table is one of the important supporting equipments in  oil  drilling  operations  and is  an important part of rotating and carrying drill strings.Its main fuctions are:

1.When normal drilling,it drive the drill tools to rotate;

2.When trip and casing running, it supports the weight of all drill string or casing string in the well;

3.When breakout, unloading the drill bit and handing the accident, complete the auxiliary work such as back-off and makeup;

4.When drilling with a bottom hole power drilling tool, it uesed to brake the upper drill string.