COP DTH Hammer
Selecting the right hammer
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 top hammer, 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 914 mm (36"). With multiple hammer units CD (Cluster Drills) drill holes up to 70" or 1778 mm as standard.
Larger cluster drills can be delivered as per customer request.
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.
Roschen ROS hammers are purpose-matched for all rock types and applications. Where high performance is the main criterion, Roschen ROS Gold hammers are recommended in blast hole drilling and Roschen ROS hammers in deep hole drilling applications. The ROS hammer has proven superior performance and adaptability to different air requirements thanks to the Air Select System.
Where proven technology is required, the Roschen ROS and ROS hammers are known for their reliability and longevity. They are practically bullet proof, making them useful for production drilling in quarries, shallow water well drilling, and underground blast hole drilling.
ROS is similar to Standard, but with heavy duty chuck and wear sleeve, and a top sub fitted with tungsten carbide buttons for wear protection in harsh and abrasive conditions. These also protect the top sub from excessive wear when rotating out of the hole through broken Rock.
1. Out of the trouble of foot valve fracture and expansion and contraction.
2. Lower energy consumption and higher impact frequency. The drilling speed is 15%-30% higher than the one with foot valve.
3. Simple structure, reliable parts, long life, easy and cheap maintenance.
4. Lower air and oil consumption. The oil consumption is about 10% lower than the one with foot valve.
Choosing the right hammer is largely determined by the 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.
Roschen offers a wide range of quality, versatile DTH hammers from a number of leading industry manufacturers. Hammers are available for down hole and blast hole applications and use in nearly all ground conditions. HDD and reverse circulation hammers are available. Please refer to the HDD or reverse circulation sections of this catalogue or contact your Roschen representative for details.
Most DTH hammers are designed for use with the industry's most common bit shank types. This allows for the use of one bit on multiple hammers.
In addition to our complete range of DTH hammers, we offers a comprehensive line of hammer replacement and spare parts. Assembly drawings for all hammers are available on request.
Please contact your Roschen representative for product specific information and DTH hammer ordering assistance.
ROSCHEN DTH Hammers Specifications
ROS 11 ROS 22
API 2 3/8" Reg
API 2 3/8" Reg
ROS 52 ROS 54
API 2 3/8"Reg/API 3 1/2" Reg
ROS 62 ROS 64
API 3 1/2" Reg
ROS 82 ROS 84
API 4 1/2" Reg
API 6 5/8" Reg
API 6 5/8" Reg
Notes: Metzke, Remet thread is available!
1. Methods of Payment:
T/T (Telegraphic Transfer) or Western Union or L/C at sight
2. Handling time for an order
Only 2 or 3 days if we have stock on your request size.
Based on order quantity, normally it takes 25 days for production.
3. Shipping way
Sample order: we suggest Courier express like DHL/UPS/TNT/FEDEX or by air
Bulk order: we suggest by air or by sea.
4. Quality Control
We have our own experienced QC.
There will be strict inspection and testing for every order before shipping out.
5. After Services:
(1). Our sales team will response for your question within 24 hours (Holidays Excluded)
(2). Technical Support will be available in any time
(3). Free replacement will provide once the failure confirmed caused by our product quality
6.How can we trust your company?
We support Alibaba trade insurance. Protecting products quality, shipment on time and your covered amount.
Any other questions,please feel free to contact with me online or by phone.
ROSCHEN GROUP is professional in manufacturing and supplying quality cop dth hammer as one of the leading manufacturers and suppliers in China. We now bring you high quality cop dth hammer for sale, competitive in its excellent performance and high precision. Please rest assured to buy.