Audited Supplier
Advantages:
HJG(BD DRILL) High Air Pressure Deep Hole Rotary Pneumatic Drilling DTH hammer without foot valve for COP MISSION DHD QL SD.
The optimum range of hole size for blast hole drilling with DTH is 90 mm to 254 mm (3 ½"-10″). Smaller blast holes are generally drilled using tophammer, and larger holes generally use rotary machines.
In other applications, like foundation drilling, DTH hammers can be used with single bit in hole sizes up to . 750 mm (30″). With multiple hammer units CD (Cluster drills) drill holes up to 70″ or 1778 mm.
As a rule of thumb, the smallest hole diameter a DTH hammer can drill is its nominal size. A 4 inch hammer will drill a 4 inch (102 mm) hole. The limiting factor is the outside diameter of the hammer, because, as hole diameter reduces, airflow is restricted. Maximum hole size for production drilling is the nominal hammer size plus 1 inch, so for a 4 inch hammer the maximum hole size is 5 inch (127-130 mm).
Choosing the right hammer is largely determined by hole size and type of rock formation. Ideally, the size of the hammer should match the required hole dimension as closely as possible, leaving just enough space for cuttings to evacuate the hole.
PARAMETERS:
| Length(exclude bit) | Weight(exclude bit) | External Diameter | Bit Shank | Hole Range | Connection Thread | |
| 1183 mm | 92.00 kg | Φ146 mm | QL60 | Φ155mm _ Φ203mm | API 3 1/2'' Reg | |
| Working Pressure | Impact rate at 0.5 MPa | Recommended Rotary Speed | Air Consumption | |||
| 1.0 MPa | 1.8 MPa | 2.4 MPa | ||||
| 1.0_2.5 MPa | 25 Hz | 20-30 rpm | 9 m³/min | 18 m³/min | 26 m³/min | |
Factory View:
Frequently Asked Question:
1.Are you a manufacturer or a trade company? |
We are a manufacturer of rock drilling equipments and pneumatic tools in China over 17 years. |
2.How many workers in your factory?and what is your company scale? |
We have more than 700 employees, including factory workers,sales people,QC ,R&D and management team. |
3.Where are your company? |
We are located in Changsha city,Hunan province,where our first chairman Mao was born.1 and half hours by car from the nearest Huanghua international airport,2 and half hours by CHR express from Guangzhou nan station to Changsha city. |
4.Why choose HJG DRILL? |
1)We have more than 17 years of researching,developing, manufacturing and exporting high quality rock drilling equipments and penumatic tools to the global market. |
2)High quality compatible with Sandvik, Atlas Copco,Ingersoll Rand etc... |
3)Unbeatable price |
4)Excellent service. |
5.Which port do you shipping from? |
We usually ship container from Shanghai port.Guangzhou port is available too. |
6.Can you accept OEM & ODM ? |
Yes, both of them are acceptable. |
7.What is your minimum order quantity? |
Our MOQ are 1pc or 1 complete set, the price may rely on the order quantity. |
8.What is your payment term? |
We can accept T/T, L/C at sight, West union and in cash. |
9.How about the delivery time? |
It all depends,generally it takes about one month both in peak and off season. |
10.Could we make a schedule of an appoinment with your company? |
Definitely.You are the most welcome.Please inform us your arrival time in any place of China and initial routine in advance.We can reserve the hotel,offer pickup service from Changsha Huanghua airport or the CHR Express station unpon your arrival and after the appoinment.Be our guest then! |
Weclome our dearest customers to Visit our factory and to choose our great product ranges!
