what does a jumbo drill do？A jumbo drill (also called a drilling jumbo) is a large piece of equipment used mainly in underground mining, tunneling, and other underground construction projects to drill holes into rock before blasting.

  1、The main uses of jumbo drill :

   ① Drilling blast holes

   In the drill-and-blast method, jumbo drills bore multiple precise holes into rock.

   These holes are then loaded with explosives to break rock for excavation.

   ② Creating bolt holes for ground support

   Jumbo drills can also be used to drill holes for installing rock bolts and other support systems to stabilize tunnels and underground spaces.

  ③ Excavating in hard rock

   Especially effective in hard, abrasive rock formations where other excavation methods are slow or impractical.

  ④ Tunnel face preparation

   Can drill holes in specific patterns for smooth blasting and better tunnel profile control.

  ⑤ Construction in confined underground spaces

   Commonly used in mining shafts, hydropower projects, subway tunnels, and underground caverns.

   2、Here's what it does step by step:

   ①  Positioning – The jumbo drill is driven into place inside a tunnel or mine heading. It's mounted on wheels or tracks for mobility.

   ②  Drilling blast holes – It uses one or more hydraulic or pneumatic drilling arms (“booms”) to drill precise, deep holes in the rock face.

  ③  Hole pattern – The holes are drilled in a planned pattern (often dozens at once) to control how the rock will break when blasted.

  ④  Preparation for blasting – After drilling, explosives are inserted into the holes to break the rock, allowing excavation to continue.

   A jumbo drill's main job is to accurately and efficiently drill multiple holes in rock for blasting or anchoring, speeding up excavation in both mining and civil tunneling projects.