Power head of rear cover-plate type rotary drilling rig and installation method thereof

Abstract

The invention discloses a power head of a rear cover-plate type rotary drilling rig and an installation method thereof. The power head comprises a carriage device, a hydraulic motor, a planetary reducer, a driving gear, a driven gear, a gearbox casing, a drive bushing, a buffer device and a disk-pressing device, wherein the gearbox casing comprises a rear cover-plate and a main casing, the main casing is in an integral structure and the rear side of the main casing is provided with an opening, the top surface of the main casing is provided with a first installing hole and a third installing hole, the bottom surface of the main casing is provided with a second installing hole and a fourth installing hole, and the diameter of the second installing hole is greater than that of the first installing hole; the driven gear is embedded in the main casing from the opening on the rear side of the main casing; the rear cover-plate is locked and fixed at the opening on the rear side of the main casing; and the driven gear is installed by using a pre-designed tool, and has the characteristics of novel process, convenience and rapidness in installation, and the like. By using the power head disclosed by the invention, after a rear cover-plate type structure is adopted, the stiffness of the gearbox casing is increased and a larger output torque is acquired.

Description

technical field [0001] The invention relates to a back cover type rotary drilling rig power head, in particular to a back cover type rotary drilling rig power head with good rigidity and large output torque and an installation method thereof. Background technique [0002] At present, the power head of the rotary drilling rig in the prior art is mainly composed of a carriage device, a hydraulic motor, a planetary reducer, a driving gear, a driven gear, a gear box, a driving sleeve, a buffer device, and a pressure plate device. The hydraulic motor transmits power to the planetary reducer, then to the driven gear through the driving gear, and finally to the drill pipe of the rotary drilling rig through the drive sleeve connected with the driven gear. The power head of this rotary drilling rig in the prior art has a dual hydraulic motor drive type and a single hydraulic motor drive type, but no matter whether it is a dual hydraulic motor drive or a single hydraulic motor drive r...

AI Technical Summary

Problems solved by technology

The power head of this rotary drilling rig in the prior art has a dual hydraulic motor drive type and a single hydraulic motor drive type, but no matter whether it is a dual hydraulic motor drive or a single hydraulic motor drive rotary drilling rig power head, there are deficiencies. : The output torque is difficult to increase and the rigidity is poor

In order to achieve a stable connection, the side wall of the main box is required to have a certain thickness, so that the side wall of the main box can open screw holes and meet the rigidity requirements. However, too thick side walls of the main box will cause The available space becomes smaller, so that the processing size of the driven gear is limited, so that the output torque of the entire power head cannot be increased

In addition, the gear box adopts the upper cover plate or the lower cover plate type, which will also lead to poor rigidity of the gear box body, and the use is not reliable enough

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