What Are The Differences between Different Models of Second-hand Rotary Drilling RIGS? When Choosing A Model, First Consider These Three Points

There are numerous models of second-hand rotary drilling RIGS, and different models correspond to different construction requirements. Choosing the right model can significantly enhance efficiency, while choosing the wrong one may lead to resource waste. The following is an analysis of model differences and key points for selection from three core dimensions:

I. Classification by the maximum diameter of the borehole

1.Small drilling rig (diameter ≤1.5 meters)

It is suitable for municipal greening and small-scale pile foundation projects. The machine body is flexible and suitable for narrow sites. However, the drilling depth is limited (usually ≤30 meters), making it difficult to cope with hard rock layers.

2. Medium-sized drilling rig (diameter 1.5-2.5 meters)

It takes into account both efficiency and adaptability, and can be used in medium-sized projects such as building construction and Bridges, with a drilling depth of up to 50 meters. The second-hand market has a large circulation volume and outstanding cost performance.

3. Large drilling RIGS (diameter ≥2.5 meters)

For heavy-load projects such as high-speed railways and large Bridges, special drill pipes need to be matched, with a drilling depth exceeding 80 meters. For second-hand equipment, it is necessary to focus on inspecting the load-bearing wear and tear of core components.

II. Classified by power grade

1.Low-power models (power ≤200kW)

It has low energy consumption and is suitable for soft soil layers such as clay and sand. The purchase cost and maintenance expenses are relatively low. However, in hard rock strata, insufficient power is prone to occur.

2. Medium and high power models (power 200-400kW)

It is compatible with various strata and can be equipped with auxiliary devices such as impact hammers. For second-hand equipment, attention should be paid to engine carbon deposits and changes in fuel consumption.

3. Ultra-high power models (power > 400kW)

Designed specifically for hard rock and pebble layers, it is used in conjunction with hydraulic crushing devices. The second-hand market has a limited stock, so it is necessary to strictly verify the maintenance records of core components.

When selecting a model, a comprehensive judgment should be made based on engineering geology, drilling depth and site conditions: for small-scale projects, small drilling RIGS should be given priority; for hard rock or deep hole projects, high-power models should be matched. At the same time, for second-hand equipment, it is necessary to focus on checking the status of core components that match the model to avoid waste caused by "a small horse pulling a big cart" or excessive performance.