TwinDrive Thread - Improved operating life up to 40 percent
In many situations more and more powerful drilling machines and drifters are necessary. For you to be able to optimally benefit from your high quality tools. Boart Longyear has now developed a considerable improvement of drilling systems.
For this, scientists and engineers in our research center used the Finite Element Techniques and their international know-how in developing a new thread mainly designed for pipe and flushing head connections in rotary percussion drilling systems; the TwinDrive thread.
At first this new thread was developed for pipes with a small diameter as these confronted fewer difficulties in practical application. Meanwhile a number of well-known companies tested the new TwinDrive thread and achieved an improved operating life of the complete drilling rods of up to 40 percent.
After drilling, the new threads are more easily released. Thus, work of the drilling staff becomes easier and the drilling rods are considerably more prevented from damage.
TwinDrive threads can be provided for the complete series of overburden drilling systems of Boart Longyear.
Other advantages:
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less delicate
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easier to release
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higher loading capacity
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more resist en against flowing liquids (flushing substances)
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less sensitive to dirt
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less thread wear
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Connection type with standard thread
Shock wave through a drilling rod connector with standard thread at a certain point of time t = t1s. |
Connection type with TwinDrive thread
Shock wave through a drilling rod connector with Boart Longyear TwinDrive thread at a certain point of time t = t1s. |
This comparison shows a significant lower average tension in drilling rod connector with Boart Longyear TwinDrive thread.
Average maximum connection stress behind external and internal threads of the drilling rod connectors equipped with the new TwinDrive thread is considerably lower than that of the standard version.
Also the ratio of transmitted energy in connection with the percussion frequency to the field limit (highest tension and compression stress) is much lower.
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