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Working Steps:
1. The overburden drilling system is consist of DTH hammer, eccentric designed reaming and pilot bit, guide device and casing. The eccentric bit reaming rotates outward to drill a larger hole so as to enable the steel casing enter the hole simultaneously. Rock dust is blown out of the hole through the casing pipe.
2. After drilling to the specific depth, the reamer will be retracted by slightly reversing the rotation direction or by pulling the tool, and it is the time that drilling tools can be pull out.
3. Pulling the casing up and meanwhile filling concrete or other things underthe hole.
4. Using ordinary drilling bit can continuously drill the hole, while DTH bit can drill to the required depth.
We use standard exporting package or as your request.
In stock: We can deliver once received the 30% deposit.
Out of stock: We can deliver within 25 days once received the 30% deposit.
Q1.Why choose us?
A1. High-quality products, reasonable price, professional team work.
Q2. Which industry can use our products?
A2.Mining, tunnel, foundation pit, quarry, oil, well, etc.
Q3. Do you have different type for different kind of stone?
A3. Yes, according hardness of stone and stone's feature, we have different type respectively.
Q4. If we need technical support, can you offer us?
A4. Yes, we have an experienced team, offering our customers additional benefits with specific advice.
Q5. Do you offer free samples?
A5. Normally we do not offer free samples, but we could properly adjust according to detailed requirement.
Q6. Is there cheap shipping cost to import to our country?
A6. For small order, express will be the best, and for bulk order, sea is best way but take longer time. For urgent orders, we suggest via air or by express send to your destination.
Q7. Which Express company you send? How many days we can receive?
A7. We are official partner of TNT, UPS, DHL, Fedx. It will take only 3-5 days after we sent.
Q8. When you can reply to me when I send you an Inquiry?
A8. We promise to reply within 24 hours ( includs holidays) on receipt of your inquiry.
Q9. Are you a manufacturer or agent?
A9: We are a manufacturer.
