SYMMETRIC OVERBURDENDRILLINGSYSTEMS(Permanent)roduct Description
1. The hole-forming straightness is good and the drilling speed is fast.
The working principle of centering drilling can ensure that straight holes can be drilled in all strata such as gravel layer, sand layer and pebble layer, and the drilling speed is fast.
2. Less torque during drilling.
Centering drilling requires much less torque than eccentric drilling. The ring drill ensures smooth and stable drilling under all conditions, even if a small drilling rig is used, larger holes can be drilled.
3.Unlock-relocking is easier.
Sometimes it is necessary to unlock the system during drilling, and it is easy to re-lock the centering drilling, because there is no eccentric member in the system that must be opened and closed in the hole.
4. Drilling can be carried out at any angle.
The centering drilling tool can drill holes at any angle.
5. The slag discharge effect is good.
In centering drilling, the air flow used for slag removal immediately rises along the casing after being ejected from the pilot bit, so the damage to the hole wall is small and the slag removal effect is good.
6. Easy operation and safe system.
Because the centering drilling work is smooth, drillers don't need to pay continuous attention to drilling work.
7. Economy and low cost.
The structure and working principle of the centering drilling system can ensure that the downtime can be significantly reduced, with less consumables and low operating cost.
| Tube parameters |
Concentric Casing System |
Concentric bit |
Reaming sleeve |
Recycle or not |
| Model |
Wall Thickness(mm) |
Model |
Reamed Dia.(C)mm |
Diameter through drill bit(mm) |
weight
(Kg) |
Model |
weight
(Kg) |
Model |
weight
(Kg) |
| 114 |
10 |
114-DHD3.5-1 |
126 |
84 |
10 |
114-DHD3.5 |
6.5 |
114-1 |
3.5 |
no |
| 114-DHD3.5-2 |
122 |
9.8 |
114-2 |
3.3 |
yes |
| 127 |
10 |
127-DHD3.5-1 |
142 |
93 |
16 |
127-DHD3.5 |
11.5 |
127-1 |
4.5 |
no |
| 127-DHD3.5-2 |
135 |
15.7 |
127-2 |
4.2 |
yes |
| 140 |
10 |
140-DHD4-1 |
161 |
97 |
20.5 |
140-DHD4 |
16 |
140-1 |
5 |
no |
| 140-DHD4-2 |
148 |
20.3 |
140-2 |
4.8 |
yes |
| 146 |
10 |
146-DHD4-1 |
165 |
110 |
22.5 |
146-DHD4 |
16 |
146-1 |
6.5 |
no |
| 146-DHD4-2 |
154 |
22.2 |
146-2 |
6.2 |
yes |
| 168 |
12 |
168-DHD5-1 |
188 |
127 |
27 |
168-DHD5 |
20 |
168-1 |
7 |
no |
| 168-DHD5-2 |
180 |
26.8 |
168-2 |
6.8 |
yes |
| 178 |
12.7 |
178-DHD5-1 |
196 |
131 |
32.5 |
178-DHD5 |
24 |
178-1 |
8.5 |
no |
| 178-DHD5-2 |
185 |
32.1 |
178-2 |
8.1 |
yes |
| 194 |
12.7 |
194-DHD6-1 |
214 |
145 |
42.5 |
194-DHD6 |
32.5 |
194-1 |
10 |
no |
| 194-DHD6-2 |
202 |
42 |
194-2 |
9.5 |
yes |
| 219 |
12.7 |
219-DHD6-1 |
243 |
170 |
58 |
219-DHD6 |
44.4 |
219-1 |
13.6 |
no |
| 219-DHD6-2 |
228 |
57.2 |
219-2 |
12.8 |
yes |
1. Are you exact manufacturer or just trading company?
We are both,we have our own factory. And also have many long-relationship factories.
2.What is your minimum order quantity?
Our MOQ are 1pc or 1 complete set, the price may rely on the order quantity.
We are welcome your sample order to testing our quality.
3. Can you accept OEM & ODM?
Yes, both of them are acceptable,.Please tell us your requirements or design drawings kindly.
As we have our own R&D team and the team leader is Dr.Zhao mingchun who has been always
in the material research and drawing design of drilling tools for 25 years.And he had designed
the world's biggest top hammer bit and DTH hammer bit, highly praised by the users.
4. How about Packing
Using ply-wooden cases and pallet for exporting to protect products and avoid the damagement during transportation.
Also, we can customize package according to your special requests.
5. How about the delivery time?
It depends, generally it takes about 15-25day. If have stocks, Usually only 5-10 days if in stock.
6. Can I have a visit to your factory before the order?
Sure, welcome, kindly contact us for address details and time schedule.
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