Hydraulic break-out tongs with screw thread protection function

Abstract

The invention discloses a pair of hydraulic break-out tongs with a screw thread protection function, which comprises a bearing 1, a swing arm 2, a slewing support 3, a motor 4, a pedestal 5, a bracing seat 6, a break-out oil cylinder 7, a lifting oil cylinder 8, a bracing arm 9, a pin shaft 10, a hoisting frame 11, an upper rotary rail 12, a break-out tong part 13, a lower rotary rail 14 and a clamping tong part 15. The pair of break-out tongs is high in automation degree, convenient to mount and dismount and strong in break-out capability, can quickly realize actions of swing, lifting, clamping, as well as drilling rod screwing and dismounting, and has the drilling rod screw thread protection function during break-out.

Description

technical field

[0001] The patent of the present invention relates to a hydraulic shackle tongs with thread protection function, which is suitable for shackles of drill pipes of vehicle-mounted drilling rigs. Background technique

[0002] The shackle is an important step in the tripping process during the drilling process of the vehicle-mounted drilling rig. The purpose is to release the first buckle connected by the drill pipe. The required torque is large, often reaching 2 to 3 times the rotary torque. For shackles, the lower tongs are generally used to fix the lower drill pipe, and the upper tongs clamp the upper drill pipe to reverse to achieve the purpose of unloading the drill pipe. During the unscrewing process, the distance between the upper and lower tongs must increase with the disengagement of the thread. , to ensure that the thread will not be squeezed and damaged. When the vehicle-mounted drilling rig is transported, since the shackle tongs are located at the t...

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