| 摘要 |
The present invention is a ram used in the live and dead heads of an ir on roughneck. The rams grip sections of pipe as connections are made or broken between the pipe sections. The ram comprises a cylinder block having a bore and a fixed piston centered therein forming an annulus. An annular piston slides i n and out of the cylinder block in the annulus. A tong mounted on the end of the end o f the annular piston for gripping pipe comprises a tong shoe and a tong die within the shoe. The tong die is capable of moving side-to-side within the shoe to self-cente r itself when gripping pipe. Pressurized gas or hydraulic fluid systems are used to extend and retract the annular piston within the cylinder block.
|
