A double-layer planetary claw clamping mechanism of an open-type power tong main tong

Abstract

The invention relates to the technical field of hydraulic power tongs for dismounting pipe column threads, in particular to a double-layer planet claw clamping mechanism of main tongs of open-type power tongs. The double-layer planet claw clamping mechanism comprises a brake mechanism, a clamping mechanism, a reversing mechanism, a gear drive mechanism, a plurality of mandrels, an upper planet claw cover plate, an upper planet claw connecting plate, a planet connecting plate and a lower planet jaw connecting plate. A planet gear and a planet claw are mounted on each mandrel through a key bar, and each planet gear is meshed with a brake gear ring through a guide wheel to drive torque, so that an outer curved tooth plate of each planet claw clamps a pipe column. When the double-layer planet claw clamping mechanism is used, through the design of the upper and lower layers of the planet claws, the structure is uniformly stressed, a pipe body is clamped in two sections, and stress deformation of the pipe body is reduced greatly; when the tongs reach torque, the double-layer planet claw clamping mechanism is small in opening deformation, stable in structure, reliable in running and convenient to use and maintain. In addition, the double-layer planet claw clamping mechanism has the advantages of simple structure, reasonable arrangement, low production cost and the like.

Description

technical field [0001] The invention relates to the technical field of hydraulic power tongs for unloading pipe string threads, in particular to a double-layer planetary claw clamping mechanism of an open-type power tong main tong. Background technique [0002] The clamping mechanism of the existing main tongs of the open power tongs is mainly a slope plate type curved surface roller clamping mechanism. Rollers are set between them, and slope plates are set on the jaw plate. The jaw plate is installed on the jaw plate frame through the rotating shaft. When the open gear rotates relative to the jaw plate frame, the rollers roll and climb relative to the jaw plate slope, and the jaw plate Rotate around the rotating shaft to make the tooth plate touch the pipe to realize the threading operation of loading and unloading the pipe. The position point of each ramp of this kind of power tongs can only clamp a specific pipe diameter. To clamp pipes with different pipe diameters, par...

AI Technical Summary

Problems solved by technology

First of all, the upper and lower parts of the planetary claws and the gears cause the clamping mechanism to be unbalanced in the axial direction; second, oil, sediment, etc. are easy to enter the meshing parts of the gears, causing accelerated wear of the gears and unreliable transmission; third, The planetary wheel transmits the torque of the clamp head. In order to meet the requirements, it must have a sufficient axial dimension, and it is prone to slippage. Deformation; Fifth, there is a lack of ribs in the cavity of the open gear. After the pliers reach the torque, the deformation of the opening will be large, which will seriously affect the clamping effect and cause slippage.

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