本鉗具有以下特點 This tong has following features： ?
This tong simplifies hydraulic system because only hydraulic motor uses hydraulic power, other parts usecompressedair. ?
Upper tong integrates with lower tong to avoid twisting drill pipe in big torque operation and to prevent it slipping in neck. ?
Workers operate it very convenient for shifting gear without power off. ?
Automatic centralizing clamping mechanism can clamp new and old tool joint reliably. ?
Air cylinder can push or pull this tong, saving labor’s force. ?
Resetting and aligning the opening is convenient. Changing makeup to breakout is quick and reliable. ?
Torque and speed can be controlled. It can get the biggest torque and the highest speed inclockwiseorcounter-clockwise. ?
The clamping structure is simple. The clamping of upper tong and lower tong is accomplished by brakingbandandclamping cylinder respectively. Safety door can avoid tong head deforming in big torque operation (70-100 kN.m.).