Application

Core barrel are used for cutting an annular ring in rock or concrete (also reinforced concrete)

The center core is usually broken with round shank picks, rock auger or cross cutter. 

The advantage of using the core barrel is the concentration of the crowd force and torque on small ring of cutting teeth

Feature

Core Barrel with Cross Cutter, mainly to used for break rock cores which remain in the borehole after using a core barrel. The core is broken with round shank picks, The cutting are removed with heavy duty buckets. It's also suitable for drilling hard, jointed rock and for penetrating through layers containing boulders.

Core Barrel with Double Shell, Inner shell drilling first, the outer follow, cutting ring with rock drilling bits rock,small barrel facilitates the coring operation, large barrel performs stage breaking,rock drilling bits perform stage breaking and drilling.

Cutting Dia

Normally 500mm to 3000mm, other avaliable upon request. like Φ950, Φ1050 etc...

Shell Height

Normally 1200mm / 1000mm/800mm, other avaliable upon request,prolong or shortten, increase of efficiency by drilling more.

Shell OD

Normally 420mm to 2920mm, other avaliable upon request, 

Shell Thickness

Normally 16/20/25mm, other avaliable upon request.

Stiffening Ring Thickness

Normally 20mm / 25mm, other avaliable upon request.

Stiffening Ring Height

Normally 200mm, other avaliable upon request.

Teeth

Rock Teeth-B47K22 or B40K12.

Kelly box

Normally 130*130/150*150/200*200mm, other avaliable upon request,prolong or shortten.

Payment terms: 30% T/T as deposit, 70% T/T balance payment before shipment.

Warranty & After-sale Service

ONE year since manufacture date. Out-of-warranty, online video for trouble-shooting or paid maintenance service with engineers sent to be abroad.

Why you choose us?

1. Seasoned R&D and Manufacturing Terms

With 15 years of professional experience in Kelly bar design and manufaturing. KR Drilling is capable of providing overall construction solutions and designing customized high quality Kelly bar based on various drilling conditions that the customers encounter.

2. Top Quality Raw Materilas

The raw materials o f steel pipes we use are supplied by the best manufactures in China with CE certifications. Our Kelly bars are made of high strength alloy-steel tubes with high torsional and compressive strength which will meet the strict requirments for drilling in hard formations.

3. More Life Out of our Wear Parts

The key components such as drive keys, locking recesses are made of high strength and wear-resistant materials with special heat-treatment that would help to improve the life of these parts. The internal drive keys are made of high strength and wear-resistant steel plate. These welded components also undergo special heat treatments. It not only improves the drive keys wear resistantproperties, but also the welding properties.