DTH Hammer, full name - down the hole hammer, is a kind of impact drilling tool.
Fundamental Structure
DTH hammer is mainly composed of top sub, check valve, spring, air distributor, internal cylinder, piston, external cylinder, stop ring, drive chuck and drill accessories.
Primary Classification
According to the rated air pressure of DTH hammer, it is classified as follows:
Low air pressure DTH hammer (rated air pressure < 0.7Mpa).
Medium air pressure DTH hammer (0.7Mpa< rated air pressure < 1.5Mpa).
High air pressure DTH hammer (1.5Mpa< rated air pressure <2.5Mpa).
Ultrahigh air pressure DTH hammer (rated air pressure >2.5Mpa).
According to whether the DTH bit equipped with the foot valve , DTH hammer can be divided into: DTH hammer with a foot valve, which is simple in structure, reliable in gas distribution, long in working life, easy to damage and easy to remove; DTH hammer equipped without a foot valve, which is simpler in structure, longer in working life, more convenient in maintenance, more energy saving and lower in loss.
According to the outside diameter of the DTH hammer, it can be divided into 1 inch, 2 inch, 3 inch, 4 inch, 5 inch, 6 inch, 7 inch, 8 inch, 9 inch, 10 inch, 12 inch, 15 inch, 18 inch, 20 inch, 24 inch and other models. Among them, 3 inch, 4 inch, 5 inch, 6 inch, 8 inch, 10 inch, 12 inch are more common. And one inch is equal to 2.54cm.
According to the different power, the DTH hammer is divided into traditional mechanical DTH hammer, electric DTH hammer, pneumatic DTH hammer, hydraulic DTH hammer and other types.
Development history
The development of DTH hammer technology can be traced back to the early 20th century.
Initially, the design of the DTH hammer was relatively simple, mainly relying on the principle of mechanical impact for rock breaking. In this period, the DTH hammer was low in power and was mainly used in small-scale mining and drilling operations.
With the progress of science and technology and the growth of industrial demand, the technology of DTH hammer has undergone several major innovations. Since the 1950s, the introduction of hydraulic technology has greatly increased the power of DTH hammer. The DTH hammer of this period was more compact in structure and more convenient in operation.
In the 21st century, the technology of DTH hammer is further moving towards intelligence and automation.
Working Principle
The working principle of DTH hammer is to rely on the reciprocating high pressure gas to push the piston down at high speed and impact the drill to break the rock.
First, high-pressure gas pushes the check valve through DTH drill pipe and enters the front chamber through DTH hammer gas channel.
Subsequently, as the volume of the front cavity increases, the high-pressure gas pushes the piston upward.
When the piston moves up to a certain extent, the front cavity deflates and the back cavity enters the compressed gas. At this time, the piston still moves upward due to the inertia action.
Meanwhile, when the piston rises to a certain extent, due to the compression of the rear chamber, the gas pressure increases, and the piston begins to impact downward, forming an impact stroke.
After that, the above process is repeated to achieve impact and complete drilling.
Common Model
The commonly used models of high air pressure DTH hammer are mainly as follows: DHD series, Mission series, QL series, SD series.
The common model of medium air pressure DTH hammer is BR series.
The common model of low air pressure DTH hammer is CIR series.
Characteristics And Application
The characteristics of DTH hammer are mainly efficient energy transfer, reliable structural design, environmentally friendly operation and easy maintenance. These characteristics together ensure the stable and reliable operation of DTH hammer under various complex geological conditions, and are used in a wide variety of applications.
The main application of DTH hammer is in geological exploration, mining, earthwork, water well,slope anchorage, tunneling, construction and so on.
Future
The development of the DTH hammer industry has a long history. With the change of demand, technology of DTH hammer is constantly improving, and the variety of DTH hammer is increasingly rich.
Nowadays, with the recovery of the global economy, investment in mineral resources development, earthwork, geological exploration, infrastructure construction and other fields has increased, so the demand for DTH hammer has also increased.
However, the pace of demand growth varies by region and sector. For example, in the mining industry, there is a growing demand for efficient and environmentally friendly DTH hammer due to increased environmental requirements. In the field of Earthwork, the demand for multi-functional, high-efficiency DTH hammer is more prominent. Therefore, DTH hammer still continue to improve as the demand changes.
LEANOMS DTH Hammer
LEANOMS DTH Hammers are faster, longer lasting and more service friendly, compared with other drilling products in the market. LEANOMS DTH Hammer is widely used in a variety of drilling applications, with a variety of models and sizes, to provide customers with solutions and customized DTH Hammers.
