Bauer BG36 Rotary Drilling Rig Used Drilling Parts Drilling Tool Kelly Bar

Kelly Bar Description

Kelly bars are key components in the execution of boreholes by hydraulic rotary drilling rigs. Teleskopic Kelly bars transfer torque and crowd force from the rotary drive to the drilling tool. Hunan HM Machinery Co is a highly specialized manufacturer of telescopic kelly bars to be applied to any type of piling rig available in the market such as Bauer, Sany, Xcmg, Zoomlion, Sunward, Soilmec, IMT, Mait.... Kelly bars are featuring specific construction details:

• 2 - 5 fold telescopic construction for a depth range from 15 - 150 m
• the tubular kelly sections are manufactured from high-tensile steel to ensure minimum weight at adequate strength
• torque transfer capacity 120 - 480 kNm
• interlocking kelly bar type
• friction kelly bar type
• locks and wear-resistant drive rails (accordingly with rotary sleeve)
• Robust Terminal joints, that are the terminal part of each telescopic pipe, provided to transfer torque and crowd force       to the kelly bar
• bottom shock absorbers
• standardised square kelly drive stub for connecting all types of drilling tools
HM Machinery Co kelly bars are designed by technicians and engineers with over 9 years experience. Construction and welding manufacturing process of kelly bars is by means of high quality materials and high mechanical features steel, provided with origin and quality certificates to guarantee long-life and reliability of the product after accurate engineering process.

Interlocking Kelly Bar

Interlocking kelly bar system are especially designed for drilling into hard materials and when crowd force application is required.Locking kelly bars are provided with drive rails designed with locking pockets on their length and corresponding termina joints locking guides. The purpose is to interlock each telescopic element to the inner following one in order to apply the maximum torque and crowd force developed by the base rig.Therefore the rotary table inner drive is also equipped with locking pockets,. When extracting the locking bar from down the hole, the combination of lifting and rotating counterclockwise will allow the telescopic element to unlock. interlocking Kelly bars are usually supplied with 3 or 4 telescopic elements.

Friction Kelly Bar

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.

Step 1: Market Research Before Design Kelly Bar

Step 4: How to select Kelly Bar

Please fill below form and send email to us or get technical support from us to choose right kelly bar for you

3 Kelly Bar Manufacture Procedure and Quality Control

- Offer Quality supervision and inspection record document for each manufacture procedure

- Technology standard for each procudure

-  Should be signed by operator, procudure receiving incharge and quality inspector