Efficiency of Cooperative Operation Between Screw Air Compressor and KT12 DTH Drill Rig

 

In open-pit mining, stonework blasting, and large-scale construction projects, the drilling operation is a core link that directly determines the progress, cost, and safety of the entire project. The KT12 integrated down-the-hole (DTH) drill rig, as a high-performance drilling equipment widely used in open-pit mines and stonework projects, relies heavily on stable and efficient air supply to exert its optimal performance. The screw air compressor, with its advantages of stable air supply, high energy efficiency, and strong adaptability, has become the preferred matching equipment for the KT12 DTH drill rig. The scientific and reasonable cooperative operation between the two not only can maximize the drilling efficiency but also reduce the operation cost and equipment failure rate, bringing significant economic benefits to the project. This article will deeply explore the efficiency performance, cooperative mechanism, and optimization strategies of the cooperative operation between the screw air compressor and the KT12 DTH drill rig.

1. Overview of Core Equipment and Cooperative Basis

1.1 KT12 DTH Drill Rig: High-Efficiency Drilling Core Equipment

The KT12 integrated DTH drill rig is a professional drilling equipment driven by a Cummins China Stage III diesel engine, which can drive the screw compression system and hydraulic transmission system through two-terminal output. It is mainly used for drilling vertical, inclined, and horizontal holes with a diameter of 115-152 mm, and is widely applied in open-pit mines, stonework blast holes, and pre-splitting holes. The rig is equipped with an automatic rod handling system and a drill rod lubrication module, enabling single-person operation and reducing the number of mining operators; the main control actions are integrated into one handle, which is easy to operate; at the same time, it is equipped with an anti-jamming system and optional drilling angle and depth indication, which simplifies the drilling process and improves drilling quality. The efficient dust collection system and comfortable cab also provide a good working environment for operators, further ensuring the continuity and stability of drilling operations.

1.2 Screw Air Compressor: Stable Power Source for Drilling

The screw air compressor is an independent air supply device that uses a diesel engine or electric motor as the power source to drive the screw air end to compress air. Compared with traditional piston air compressors, it has the characteristics of stable air pressure output, large air supply, low noise, low energy consumption, and long service life, which can fully meet the high-demand air supply requirements of DTH drilling operations. For the cooperative operation with the KT12 DTH drill rig, portable diesel-driven screw air compressors are usually selected, which have the advantages of self-power supply (no external power supply required), strong mobility (integrated on trailers or skids, convenient for field operations), and high reliability (adaptable to extreme environments such as high temperature, high humidity, and high altitude). The air pressure and air volume of the screw air compressor can be flexibly adjusted according to the drilling depth, rock hardness, and drill bit specifications, providing a customized air supply solution for the KT12 DTH drill rig.

1.3 Cooperative Basis Between the Two

The core of the cooperative operation between the screw air compressor and the KT12 DTH drill rig lies in the matching of air pressure and air volume. The KT12 DTH drill rig is equipped with K4 and K5 DTH hammers, which require stable air pressure and sufficient air volume to drive the hammer to impact the rock and discharge the drill cuttings smoothly. The screw air compressor can provide continuous and stable high-pressure air, which not only drives the DTH hammer to work efficiently but also flushes the drill hole in a timely manner, preventing drill jamming caused by the accumulation of drill cuttings, thus ensuring the smooth progress of drilling operations. The reasonable matching of the two can avoid the waste of air supply capacity or the insufficient air supply that affects the drilling efficiency, forming a complementary and efficient operation system.

2. Efficiency Advantages of Cooperative Operation

2.1 Significantly Improve Drilling Speed

The drilling speed of the KT12 DTH drill rig is directly affected by the stability of the air supply. The screw air compressor can output stable high-pressure air with a small fluctuation range, which ensures that the DTH hammer of the KT12 drill rig can maintain a stable impact frequency and impact force, avoiding the reduction of impact efficiency caused by unstable air pressure. According to field test data, when the KT12 DTH drill rig is matched with a suitable screw air compressor (with air pressure of 19.5 bar and air volume of 19 m³/min, matching the inherent air supply parameters of the KT12 drill rig), the drilling speed can be increased by 20%-30% compared with the matching of traditional piston air compressors. Especially in the drilling of medium-hard rock (rock hardness F=6-20), the advantage of stable air supply is more obvious, and the average drilling speed per hour can reach 40-45 meters, which greatly shortens the drilling cycle of a single hole.

2.2 Reduce Equipment Failure Rate and Extend Service Life

The unstable air supply of the air compressor is one of the main reasons for the failure of the KT12 DTH drill rig, such as drill jamming, hammer stuck, and drill rod wear. The screw air compressor has stable operation performance, small vibration, and low failure rate, which can provide continuous and clean air supply, reducing the wear of the drill rig's internal components (such as DTH hammer, drill rod, and air pipeline) caused by unstable air pressure or impure air. At the same time, the screw air compressor is equipped with a complete protection system (such as over-temperature, over-pressure, and oil shortage protection), which can automatically shut down when an abnormality occurs, avoiding damage to the air compressor and the drill rig due to excessive air pressure or insufficient lubrication. Practice has proved that the cooperative operation of the two can reduce the failure rate of the KT12 drill rig by more than 25%, extend the service life of the drill rig and air compressor, and reduce the maintenance cost and downtime loss.

2.3 Improve Energy Efficiency and Reduce Operation Cost

Compared with traditional piston air compressors, screw air compressors have higher energy efficiency, with an energy-saving effect of 10%-15% under the same air supply conditions. For the KT12 DTH drill rig, which requires long-term continuous operation, the energy-saving advantage of the screw air compressor can significantly reduce the fuel consumption of the entire operation system. Taking the field operation as an example, when drilling a 115mm diameter hole in limestone (hard rock), the screw air compressor matched with the KT12 drill rig has an average fuel consumption of 2L per meter of drilling, which is 0.3-0.5L lower than that of the piston air compressor matched with the same type of drill rig. In addition, the screw air compressor has a long service life, low maintenance frequency, and low maintenance cost, which further reduces the overall operation cost of the drilling project. At the same time, some advanced screw air compressors are equipped with dynamic air volume enhancement technology, which can increase the air volume during flushing and drill rod refilling, shorten the operation time, and further improve the economic benefits of the project.

2.4 Enhance Adaptability to Complex Working Conditions

The KT12 DTH drill rig is often used in open-pit mines, construction sites, and other complex working environments, which have the characteristics of harsh conditions, large temperature changes, and uneven terrain. The portable diesel-driven screw air compressor has strong environmental adaptability, with a maximum ambient temperature resistance of 50℃, and can work normally in high-altitude, high-humidity, and other extreme environments. At the same time, the screw air compressor has a compact structure and strong mobility, which can be flexibly moved with the KT12 drill rig, adapting to the needs of mobile drilling operations. For example, in open-pit mining projects, the two can be transported by a single truck, reducing transportation costs and improving the flexibility of on-site operation arrangements.

3. Key Factors Affecting Cooperative Operation Efficiency

3.1 Matching Degree of Air Pressure and Air Volume

The matching degree of air pressure and air volume between the screw air compressor and the KT12 DTH drill rig is the core factor affecting the operation efficiency. The KT12 drill rig has a rated air pressure of 19.5 bar and an air volume of 19 m³/min. If the air pressure of the matched screw air compressor is too low, the impact force of the DTH hammer will be insufficient, resulting in reduced drilling speed; if the air pressure is too high, it will not only waste energy but also easily cause damage to the drill rig's air pipeline and DTH hammer. Similarly, insufficient air volume will lead to poor flushing effect and drill jamming, while excessive air volume will cause unnecessary energy consumption. Therefore, when selecting the screw air compressor, it is necessary to strictly match the rated air pressure and air volume of the KT12 drill rig, and adjust the parameters according to the actual rock hardness and drilling depth to achieve the optimal matching effect.

3.2 Quality of Air Supply

The quality of the air supply of the screw air compressor directly affects the operation stability of the KT12 DTH drill rig. If the compressed air contains impurities (such as dust, water, and oil), it will wear the DTH hammer, drill rod, and other components, block the air pipeline, and even cause the drill rig to fail. Therefore, the screw air compressor should be equipped with a high-efficiency air filter, oil-water separator, and other accessories to ensure that the output air is clean and dry. At the same time, regular maintenance of the air compressor (such as replacing the air filter, cleaning the oil-water separator) is required to ensure the quality of the air supply.

3.3 Operation and Maintenance Level

The operation and maintenance level of operators directly affects the cooperative operation efficiency of the two devices. Operators need to be familiar with the performance parameters and operation procedures of the screw air compressor and the KT12 DTH drill rig, and adjust the air supply parameters in a timely manner according to the drilling conditions. For example, when the rock hardness increases, the air pressure and air volume should be appropriately increased to ensure the drilling efficiency; when the drill hole is blocked, the air supply should be adjusted to flush the drill hole in a timely manner. In addition, regular maintenance and inspection of the two devices are required, such as checking the air tightness of the air pipeline, the lubrication of the drill rig, and the fuel and oil level of the air compressor, to ensure that the devices are in good operating condition.

3.4 Working Environment Factors

The working environment (such as temperature, humidity, altitude, and wind speed) also has a certain impact on the cooperative operation efficiency. In high-altitude areas, the air density decreases, which will reduce the air supply capacity of the screw air compressor. At this time, it is necessary to select a screw air compressor with a higher air volume and air pressure to compensate for the impact of high altitude. In high-temperature environments, the heat dissipation effect of the air compressor will be reduced, which may lead to over-temperature shutdown. Therefore, it is necessary to take heat dissipation measures (such as installing a heat dissipation cover, ensuring good ventilation) to ensure the normal operation of the air compressor. In rainy and humid environments, attention should be paid to the waterproof and moisture-proof of the equipment to avoid electrical faults.

4. Optimization Strategies to Improve Cooperative Operation Efficiency

4.1 Select the Right Screw Air Compressor

When selecting a screw air compressor for the KT12 DTH drill rig, it is necessary to comprehensively consider the rated parameters of the drill rig, the working environment, and the project requirements. It is recommended to select a portable diesel-driven screw air compressor with a working pressure of 19-20 bar and an air volume of 19-20 m³/min, which can perfectly match the air supply requirements of the KT12 drill rig. At the same time, priority should be given to products with high energy efficiency, strong reliability, and complete protection systems, such as the DrillAir series of Atlas Copco or the diesel-driven screw air compressors of Kaishan Group, which have mature technology and stable performance, and can better adapt to the complex field working environment.

4.2 Establish a Scientific Parameter Matching System

According to the actual drilling conditions (rock hardness, drilling depth, drill bit diameter), establish a scientific parameter matching system between the screw air compressor and the KT12 DTH drill rig. For example, when drilling soft rock (F=6-10), the air pressure can be adjusted to 17-18 bar and the air volume to 18-19 m³/min; when drilling hard rock (F=15-20), the air pressure can be increased to 19-20 bar and the air volume to 19-20 m³/min, so as to achieve the balance between drilling efficiency and energy consumption. In addition, the dynamic air volume enhancement technology can be used to increase the air volume during flushing and drill rod refilling, shorten the operation time, and further improve the drilling efficiency.

4.3 Strengthen Operation Training and Management

Strengthen the training of operators to make them familiar with the performance parameters, operation procedures, and maintenance methods of the screw air compressor and the KT12 DTH drill rig. Through professional training, operators can master the skills of parameter adjustment, fault judgment, and emergency handling, so as to avoid operation errors caused by improper operation. At the same time, establish a sound operation management system, formulate operation specifications and maintenance plans, and arrange special personnel to be responsible for the daily inspection and maintenance of the equipment, ensuring that the equipment is in good operating condition.

4.4 Strengthen Equipment Maintenance and Maintenance

Formulate a regular maintenance plan for the screw air compressor and the KT12 DTH drill rig, and carry out maintenance work in accordance with the plan. For the screw air compressor, regularly check and replace the air filter, oil filter, and lubricating oil, clean the oil-water separator, and check the air tightness of the air pipeline; for the KT12 drill rig, regularly check the wear of the drill rod and drill bit, the lubrication of the hydraulic system, and the operation of the automatic rod handling system, and replace the worn parts in a timely manner. In addition, after the end of daily operation, clean the equipment, remove the dust and debris on the surface of the equipment, and store the equipment in a dry and ventilated place to extend the service life of the equipment.

5. Conclusion

The cooperative operation between the screw air compressor and the KT12 DTH drill rig is a key link to improve the drilling efficiency of open-pit mines, stonework projects, and other fields. The screw air compressor provides stable, efficient, and clean air supply for the KT12 drill rig, while the KT12 drill rig exerts its high-performance drilling advantages, forming a complementary and efficient operation system. The scientific and reasonable cooperative operation can not only significantly improve the drilling speed, reduce the equipment failure rate, and extend the service life of the equipment but also improve the energy efficiency and reduce the operation cost, bringing significant economic benefits and social benefits to the project.

To further improve the cooperative operation efficiency, it is necessary to select the right screw air compressor, establish a scientific parameter matching system, strengthen the operation training and management of operators, and do a good job in the maintenance and maintenance of equipment. With the continuous progress of technology, the screw air compressor and the KT12 DTH drill rig will be more intelligent and efficient, and their cooperative operation mode will be more optimized, which will provide stronger support for the development of the mining and construction industry.