SUSPENDED BOTTOMHOLE Russian patent published in 2020 - IPC F42D1/08 F42D1/22 

FIELD: mining.

SUBSTANCE: invention relates to mining, to drilling and blasting operations in rocks, and can be used in various industries, which use blasting operations in rock massifs, in particular, in development of minerals by open method. Suspension well stem includes above-dimensional diameter of wellhead support structure and fixed on it by flexible link suspended part made in form of cylinder. Components of the cylinder are made in the form of flexible resilient plates, the length and width of which is proportional and 6-12 times less than their height, connected by a constant link on the lower end of the cylinder. Cylinder diameter makes 0.8-0.85 of the well diameter. Flexible elastic plates located along the perimeter of the composite cylinder have length of 40-50% longer than flexible elastic plates limited by them.

EFFECT: improving efficiency of explosion products locking in well due to uniformity of force transfer to well walls at wedging of device as a result of its actuation.

1 cl, 4 dwg