With the increase in people’s demand for deep hole rock drilling, how to send the rock drill to the bottom of the hole has become the premise of the birth of DTH drilling tools. Compared with top hammer drilling tools, DTH drilling tools have the characteristics of deep and long drilling holes, large diameter, relatively high deep hole drilling efficiency, and a wide application range. DTH drilling tools include DTH hammers, DTH drills, transition joints, drill pipes, etc. Today we mainly share with you what is a DTH hammer.

What is a DTH hammer?

The DTH hammer is an integral part of the DTH drilling rig. The DTH hammer is an integral part of the DTH drilling rig to connect the DTH drill bit and the drilling rig. It includes low wind pressure DTH hammer, medium wind pressure DTH hammer, and high wind pressure DTH hammer. It is widely used in metallurgy, coal, chemical industry, mining, water conservancy, hydropower, highway, railway, national defense, construction, and other engineering hole forming operations.

So, as an ideal drilling and blasting equipment today, what are the components of the DTH hammer?

Components of DTH hammer

DTH hammer is mainly composed of the rear joint, iron gasket, plug, spring, valve cover, valve plate, valve seat, piston, guide sleeve, front joint, transition joint, rubber ring, and check valve.

Highlight one key component, which is the piston. The piston is the main moving part of the DTH hammer, even the only moving part. According to the structure, the DTH hammer piston includes three types: the same diameter piston, the different diameter piston, and the series piston. Judging from the role of the piston in the gas distribution device and the load it bears during work, the piston should have high dimensional accuracy and surface finish so that it has good air tightness and is suitable for reciprocating motion at high speeds. A reasonable geometry not only ensures that it has sufficient strength but also can effectively transmit impact energy.

Since the DTH hammer has so many components, is its working principle also complicated? What advantages does it have?

How does the DTH hammer work?

At the beginning of the impact stroke, the piston and the valve piece are in the pole position, and the pressure air enters the upper chamber of the cylinder through the radial hole of the valve cover and seat and pushes the piston down at high speed to impact the drill bit. When the piston travels until the spline groove of the bushing is closed, the pressure in the lower chamber begins to rise, and the central hole at the upper end of the piston leaves the gas distribution rod, connecting the upper cavity with the air, then the pressure decreases, and the working stroke ends. When the piston impacts the tail of the drill bit, the valve plate changes direction due to the pressure difference between the upper and lower sides, and the piston repeats the return stroke movement.

Advantages of DTH hammers

1. The single impact energy is high, and the energy consumption for breaking rocks is low.

2. The weight ratio of the piston and the drill bit is close, and effective for a long time. It is beneficial to improve the rock crushing efficiency and prolong the life of the drilling tools.

3. The central exhaust has a good slag discharge effect and reduces the repeated crushing of rock.

4. The hammer has a check valve device to drill holes in the water.

5. It is always at the front end of the hole when working, and the transmission of the impact energy is not affected by the drilling depth.

The birth of the DTH hammer makes the large-diameter rock drilling industry into the era of mechanization. It not only improves the drilling efficiency but also indicates the epoch-making development of rock drilling tools. Of course, no matter how many advantages it has, it is still a rock drilling tool. Proper and timely maintenance can prolong the service life of the DTH hammer and greatly reduce the cost of use, which is very necessary for enterprises.

Maintenance of DTH hammer

The DTH hammer needs to clean parts in time. If the worn outer casing or the internal component leads to lower performance of the DTH hammer, more detailed inspection and maintenance are required at this time. If all parts are in good condition, it is necessary to apply lubricating oil, install them correctly according to the assembly diagram, and store them. But to ensure the best performance of the DTH hammer, regular maintenance is very important.

The maintenance of the DTH hammer is relatively simple. It is only necessary to determine whether the internal piston is moving well and whether the lubrication is appropriate.

1. Replace all “O” rings, and check valve seals and springs inside the DTH hammer, which can ensure that the DTH hammer reduces air consumption.

2. Ensure the good lubrication of the internal moving parts (pistons) of the DTH hammer, and remove all sharp corners and burrs formed during the use of the piston.

3. Ensure that the check valve is unobstructed and returned correctly.

4. The worn outer casing and the cylinder should be replaced in time as needed.

5. Install correctly according to the installation sequence of the manual or installation diagram.

6. Keep it properly.

So that’s all we have to share with you about what is a DTH hammer. In general, the birth and development of the DTH hammer are inseparable from people’s needs, people will put forward higher requirements over time, and the development of anything will inevitably go through this stage. After all, people’s needs are constantly changing, but no matter how they change, the ultimate goal of people is still to improve drilling efficiency while saving costs. I believe that in the near future, there will be a new DTH hammer born, let us wait and see.