CONSTRUCTION MACHINE FOR MAKING WELLS IN SOIL Russian patent published in 2014 - IPC E21B19/84 

FIELD: construction.

SUBSTANCE: invention relates to a construction machine, such as a construction machine to produce wells in soils. A construction machine comprises a support base, a mast and a rope hoist with a drum for rope winding. The rope hoist comprises a winding device, which includes an inlet pulley to direct the rope, a guide carriage installed as capable of displacement along the axis of drum rotation, where the inlet pulley rests, a rope brake for tightening of the rope in the area of approaching the drum. The rope brake is installed on the guide carriage and comprises a braking device and a channelled pulley made as capable of its braking by a braking device. The inlet pulley and the channelled pulley are located at two opposite sides of the rope. The braking device is made in the form of a controlled pressing pulley made as capable of its pressing to the rope with alternate pressure. There is a metering device made as capable of defining the value of the current load at the rope. There is a unit of control for automatic control of the rope brake. Besides, the rope brake activates, if the measured value of the current load at the rope is less than the minimum permissible limit.

EFFECT: invention provides for increased wear resistance of a rope and improved quality of works.

14 cl, 9 dwg