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.
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 2: Our Kelly Bar Technology
Our Structure Features:
1)Good design of kelly pipe system
2)Big Gag between each kelly pipe
3)Thick Inner and outer key
4)Arc slab structure
5)Waist-full form and plug welding
Our Technical Advantage:
1)Big Gap can get space for welding more thick key which can increase contact area during torque transfer and pressing
2)Reduce Kelly Bar Stuck Ratio
3)Not use 1 m pipe joint welding technical can get well straightness and reduce welding stress
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Structure Features:
1)Overlab joint Structure for Inner key and outer key
2)Proper gap between inner key and outer key
Technical Advantage:
1)Reduce the ratio of kelly bar stuck,kelly pipe stick, key slipping;
2)Proper gap can reduce the contract time and delivery impact force of inner key and outer key
Structure Features:
1)Plug welding for pressing position;
2)Alloy sintering technical inlay abraision-resistant alloy power(tungsten caribide, nickel)
Technicl Advantage:
1)Increase welding strength;
2)Increase pressing position wear resistant property;
Step 3: Kelly Bar Application Case
Please fill below form and send email to us or get technical support from us to choose right kelly bar for you
Factory and Offices
Work Shop and Store
Fair Show: Bauma China Exhibition-2010
1 Kelly Bar Technical Agreement with Drawing
- Offer kelly bar operation parameter
( Rig Machine pressure force and gear box torque)
2 Material Quality Report
- Offer all material quality report
- choose the top brand
- 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
1: Are you manufacturer?
- Yes, we have two factories and we are the leading manufacturer in China. Welcome if you have plan to visit our
factory and inspect the products.
2: How is your kelly bar quility?
- We manufacture kelly bar basic on serving our mother company which is a professional foundation construction
company since 2003, we deal with machinery and spare parts problems and improve it
- We succeed to be as kelly bar OEM of XCMG Co and Sany Co
- You can restudy above our technical advantage and analyze, We believe with above introduction you can make good
quality kelly bar by yourselve as well
3.What kind of kelly bar can we provide?
- We provide Interlocking kelly bar and Friction Kelly Bar
- Kelly Bar for almost all drilling rigs like Bauer, Sany, Xcmg, Zoomlion, Sunward, IMT,MAIT, Soilmec
- Study above introduction "How to select kelly Bar" to choose the right kelly bar or get our help to choose kelly bar
4. What warranty do we provide?
- We provide 6 months warranty time. During it all accessories broken we can change a new one for you.
5. What payment terms do we accept?
- We accept T/T in advance or L/C at sight.