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|Product Name:||Rotary Drilling Kelly Bar||AApplication:||Rotary Drilling Rig|
|Sections:||3,4,5||Tube Material:||Seamless Alloy Steel Kelly Bar Keyword:|
|Use:||Ore Mining, Road, Deep Foudation||Color:||Customized|
Piling Tool Kelly Bar Rotary Drilling Accessories Foundation Piling Construction
Friction kelly bar derives its name from the means by which it transfer torque to the drilling tool. The telescopic elements are advanced by using the "frictional contact" from each of the friction drive rails that run down the outside of each kelly bar. These drive rails, on the outside of each kelly bar, are driven by the rotary table and the terminal joints of each successively larger diameter kelly bar. The terminal joint is long piece on the inside and at the bottom of each kelly bar. Friction kelly bars are normally supplied in 4 or 5 telescopic elements as they are mostly used for deep piles in medium hard soil conditions.
Kelly bars has two types:interlocking and friction type,our aim is to transfer to the drilling tools both the torque and the pressure produced by the drilling machine,it can drill in dense sand and gravel and weak to strong rock.
About the quality of the key components,we select raw materials and forging parts such as drive stub Strictly to assure reliable quality.
1) Interlocking kelly bar
Interlocking pressurizing kelly bar is one type adapted to the hard layer.Its structure is that the outer keys is composited of 3 keys or 6 keys,there are usually 3 sets of concave pressurizing parts.The inner keys are composited of 3 or 6 wear-resistant strip.
This kelly bar has the advantage of passing pressure , anti-torque capacity better, and is used for drilling in dense sand,gravel and weak to strong rock.
2) Friction kelly bar
Friction kelly bar does not need to lock the joint of its inner and outer line so that it is convenient and fast to lift the bar. Non-stair key, the outside key is made by high wear-resisting tempering steel. is suitable for layer of soft ground and mud, mud, (mud) sand, gravel.
1. Adopt the advanced technology of 6-key design in the world and standard modular design.
2. All the tubes made in China are specially made seamless alloy tube,which guarantees the accuracy of the sizes,location,physical properties and easy welding.
3. All the outer keys have undergone special heat treatment.
4. Square-stub through forging and heat treating have excellent mechanical properties.
5. Increase pressing position wear resistant property.
Kelly bars is to transfer to the drilling tools both the torque and the pressure produced by the drilling machine,it can drill in dense sand and gravel and weak to strong rock.