High Quality Symmetric Overburden Casing Drilling System with Ring Bits and Pilot Bit for Sale

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High Quality Symmetric Overburden Casing Drilling System with Ring Bits and Pilot Bit for Sale 

The Bestlink symmetric/Concentric drilling system is designed to drill and case a hole simultaneously through unstable ground conditions. The driver bit incorporated with a satisficial ring or reusable ring makes a full face head design which significantly improves the penetration rate and hole straightness of drilling. The internal flushing grooves together with the built-in casing shoes gives a good seal to the button of the drilling hole, and thus minimizing the disruption of the surrounding of the drill hole.

Application Range: It is suitable for drilling water wells , geothermal wells , short miscopies ,medium mini-type grouting hole of building , dam and harbor project .

1. Ring bit and casing shoe assembly is welded to casing prior to drilling. Lock the assembly into pilot bit with hammer.  The pilot bit’s upper shoulder engages the shoulder of the casing shoe. 

2. Hammer’s percussive energy is transferred through the pilot and ring bits, crushing rock . Part of impact energy advances casing. 

3. On completion of drilling and casing , the drill string with pilot bit is retrieved by a slight reverse rotation to unlock the

bayonet coupling . The ring bit stays in the hole , and can be recovered only if the casing is retrieved 

4. Drilling continues to the desired depth in the bedrock using a conventional drilling.


Outer Dia. of Casing Tube
Inner Dia. of
Casing Tube
Reamed Dia.
 Min. Inner Dia. of
Casing Shoe
Drill Pipes
Max. Outer Dia. of Normal Bit
mm
mm
mm
mm
mm
mm
108
93-99
118
86
76
77
114
101-103
127
91
76
82
127
114-116
136
101
76
92
140
124-127
152
117
76
105
146
127-132
154
117
76
105
168
149-155
184
140
76,89
125
178
159-165
194
150
76,89
140
193
173-180
206
164
89,114
150
219
199-206
234
184
89,114
165
244
224-231
260
210
114
190
273
251-257
305
240
114,127
220
323
301-310
348
284
127
255
406
382-388
440
364
140
340
457
433-439
488
413
140
385
508
484-490
538
464
140
440


Bestlink Factory

Xiamen Bestlink Factory Co., Ltd  is  committed  to  provide  the  best  drilling  and  cutting machine,  tools and accessories products in marble and granite stone quarrying,  as well as in civil engineering application, especial demolition project. it is now a leading manufacturer of cutting and drilling equipment for the extraction of marble, granite  and ornamental stones in china.  

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