Mechanically-driven double-gear winch for casing drilling machine

Abstract

The invention discloses a mechanically-driven double-gear winch for a casing drilling machine. The double-gear winch comprises a winch input shaft and a speed reducing shifting mechanism, wherein the speed reducing shifting mechanism comprises a high-gear speed reducing mechanism and a low-gear speed reducing mechanism. The double-gear winch is characterized in that the winch input shaft is respectively connected with input ends of the high-gear speed reducing mechanism and the low-gear speed reducing mechanism; both the high-gear speed reducing mechanism and the low-gear speed reducing mechanism are chain wheel and chain driven mechanisms; the output end of the low-gear speed reducing mechanism is connected with a driving shaft at one end of a roller through a first air tube clutch; the output end of the high-gear speed reducing mechanism is connected with a driving shaft at other end of the roller through a second air tube clutch; and a third air tube clutch is arranged on the drive shaft on the high-gear speed reducing mechanism. By adoption of the double-gear winch, gears are reduced, the structure is simplified, the shortcoming that the gears are required to be frequently shifted during tripping of the conventional winch is overcome, the structure of a winch control part can be simultaneously simplified, and the double-gear winch is simply operated, the driving efficiency of the winch is effectively improved; and therefore, the working efficiency is improved, and the energy consumption is reduced.

Description

technical field

[0001] The invention relates to the field of drilling winches, in particular to a mechanically driven two-speed drawworks applied to casing drilling rigs (well depths below 4000 meters). Background technique

[0002] The drilling drawworks is one of the core components of the drilling rig system and the main lifting device of the drilling and repairing equipment. The drawworks is not only used to lower the drilling tool and casing, but also to control the drilling pressure during the drilling process. In addition, it also serves as the speed change mechanism and intermediate transmission mechanism of the turntable, and the overall lifting of the derrick.

[0003] At present in our country, the mechanical transmission winches used for oil drilling rigs are mainly multi-speed winches with multi-axis chain transmission. stalls. This kind of drawworks has strong lifting capacity and high maximum lifting speed, but has complex structure, large volume, low transm...

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