DTH Drilling Rig

Henan Yugong Machinery Co., Ltd: Your Professional DTH Drilling Rig Manufacturer!

Henan Yugong Machinery Co., Ltd. is a large-scale comprehensive enterprise integrating engineering research and development, production and sales. The company has developed rapidly over the years and has become an excellent product manufacturer in the engineering machinery industry.

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Our company has 8 product series and more than 100 products, covering industries such as bridges and tunnels, roads, light rail and high-speed rail, and mines.

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All YG products we produce are certified by ISO, SGS, CE, EPA, etc.

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Our customers are all over the world, with more than 100 countries such as the United Kingdom, France, Italy, Spain, South Africa, Africa, Japan, etc.

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Our service pursues refinement and standardization. From pre-sales technical consultation to after-sales maintenance, we always put the interests of customers first and provide customers with meticulous and thoughtful services.

What is DTH Drilling Rig

A DTH Drilling Rig, usually called DTH by most professionals, is basically a jackhammer screwed on the bottom of a drill string. The fast hammer action breaks hard rock into small cuttings and dust that are evacuated by a fluid (air, water or drilling mud).

Features of DTH Drilling Rig

High-Efficiency Drilling Capability
DTH drill rigs use down-the-hole hammer technology, where the drill bit operates directly at the bottom of the hole. By transferring power through gas or liquid to the drill bit, they achieve efficient impact and rotation. This design not only increases drilling speed but also significantly reduces energy loss, making the drilling process more efficient.

Outstanding Stability
DTH drill rigs are highly stable and can operate efficiently in complex and harsh geological environments. Their robust structure and advanced control systems ensure stable operation in various soil conditions, preventing issues like hole deviation and collapse.

Precise Control
Modern DTH drill rigs are equipped with advanced hydraulic and electronic control systems, allowing operators to precisely control drilling parameters. Drilling depth, angle, and speed can be adjusted flexibly according to actual needs, enhancing drilling accuracy and efficiency.

Low Energy Consumption Design
DTH drill rigs adopt energy-saving designs, optimizing power transmission and minimizing unnecessary energy losses. This not only reduces operating costs but also lessens environmental impact, meeting modern environmental protection requirements.

Ease of Maintenance
The modular design of DTH drill rigs simplifies maintenance and upkeep. Key components are easy to disassemble and replace, reducing downtime and ensuring efficient operation. Additionally, many DTH drill rigs feature automatic diagnostic systems that monitor equipment status in real-time, promptly identifying and addressing potential issues.

Types of DTH Drilling Rig

Classification by Drilling Method
● Rotary Down-The-Hole Drill
A rotary down-the-hole drill is a down-the-hole drill that rotates the drill rod to make the drill bit drill. This type of down-the-hole drill is used for construction in most cases.
● Impact Down-The-Hole Drill
An impact down-the-hole drill uses impact force to make the drill bit penetrate and drill holes. It is suitable for environments with relatively large drilling stress.
● Extrusion Down-The-Hole Drill
An extrusion down-the-hole drill is a down-the-hole drill that squeezes the drill bit down to drill holes. It is particularly suitable for drilling operations in water layers.

Classification by Use Environment
● Industrial down-the-hole drill
Industrial down-the-hole drills are mainly used for foundation pouring of buildings, and the drilling depth needs to reach more than 30 meters.
● Agricultural down-the-hole drill
Agricultural down-the-hole drills are mainly used for the construction of drainage and irrigation facilities in farmland, and the general depth is about 10 meters.
● Mining down-the-hole dril
Miningdown-the-hole dril is mainly used for mine prospecting operations. This type of DTH Drill can support ultra-large diameter drilling operations.

Classification by Power
● Diesel DTH Drill
Diesel DTH Drill is powered by a diesel engine and is usually used in field operations without power supply.
● Electric DTH Drill
Electric DTH Drill uses an electric motor as power and is suitable for working environments with power supply such as construction sites and workshops.

Parts of DTH Drilling Rig

Down-the-hole drill is a tool commonly used in construction, geology and mining, and is a type of drilling rig. It consists of multiple parts such as motor, gearbox, reducer, hydraulic station, cooling system and drilling tool system. Down-the-hole drill mainly consists of the following parts:

Drill Rod System
The drill rod system is a very important part of the down-the-hole drill. Its function is to transmit power to the drill bit. When the drill bit rotates, the drill rod also rotates. The drill rod system consists of drill rod, joint, drill bit, transmission shaft, etc.

Rotating Mechanism
The rotating mechanism is the core part of the down-the-hole drill, which can realize the rotation of the drill rod. The rotating mechanism consists of motor, reducer, coupling, transmission gear set, etc.

Hydraulic System
The hydraulic system is a very important part of the down-the-hole drill, which can drive the drilling rig to realize various operations. The hydraulic system includes hydraulic system, oil tank, oil pump, hydraulic cylinder, hydraulic valve and other parts.

Drilling Rig Base
The drilling rig base is the supporting structure of the drilling rig, which can be adjusted as needed to ensure the stability and safety of the drilling rig. The base of the drilling rig is generally composed of a motor, a reducer, a base plate, etc.

Control System
The control system is an indispensable part of the down-the-hole drill, which can control the operation of the down-the-hole drill. The control system consists of a human-machine interface, a processor, a program library, etc.

Detailed explanation of the names of the parts of the down-the-hole drill
Drill Rod
The drill rod is the part of the down-the-hole drill responsible for transmitting torque and torsional force to the drill bit. It is generally composed of two or three sections. The length of the drill rod can be adjusted according to specific needs.

Drill Bit
The drill bit is one of the most important parts of the down-the-hole drill, which is responsible for drilling. There are many types of drill bits, some of which are used to drill underground materials, some are used to drill water wells, and some are used to drill oil wells.

Drill Rod Joint
The drill rod joint is responsible for connecting two drill rods so that they can be tightly connected together to prevent oil and water leakage and ensure the smoothness of rotation.

Drive Shaft
The drive shaft is the part of the DTH drill used to transmit power. It can transmit the torque of the motor to the drill rod, so that the drill bit starts to rotate.

Hydraulic Pump
The hydraulic pump is used to provide hydraulic pressure to enable the DTH drill to work properly. The hydraulic pump is generally composed of high-pressure oil pipes, oil pumps, oil tanks, etc.

Cooling System
The cooling system is one of the important components of the DTH drill. It can cool the drill bit to avoid overheating damage. The cooling system consists of an oil-water radiator, a water pump, a water pipe, etc.

Applications of DTH Drilling Rig

Construction Field
Down-the-hole drills are mainly used for foundation reinforcement and basement excavation in the construction field. For example, in the center of the building base or the columns that touch the base, it is necessary to go deep underground for reinforcement. With a down-the-hole drill, it is convenient to drill holes and inject concrete that can be both reinforced and waterproof at one time.

Transportation Field
In subway construction, in order to make the line pass through busy streets and buildings better, underground crossing is required. At this time, down-the-hole drills can avoid damage to the surrounding environment, reduce construction noise and impact on traffic, and improve construction quality.

Water Conservancy Field
When underground water pipes, culverts, etc. need to be repaired, reinforced or replaced, if traditional excavation methods are used, it will not only affect the surrounding environment, but also increase the construction period and cause waste of manpower and material resources. Down-the-hole drills can avoid these problems and greatly improve construction efficiency.

Mining Field
In mining engineering, down-the-hole drills can help drill deep wells or vertical wells to avoid damaging the surface and surrounding environment of the mining area. At the same time, down-the-hole drills can also conduct underground mineral deposit exploration and evaluation, helping mine managers better understand the internal situation of the mining area and improve mining efficiency and safety.

How to Choose DTH Drilling Rig

Drilling Purpose
Determine the specific purpose of your drilling project, such as water well drilling, mine exploration, geotechnical investigation, or construction. Different applications may require different types of drill rigs.

Geological Conditions
Evaluate the geological formations you will be drilling into, including the hardness, abrasiveness, and composition of the rock. Some drill rigs are better suited to soft formations, while others are better suited to hard or abrasive formations.

Drilling Depth and Diameter
Determine the required drilling depth and diameter. Consider the maximum drilling depth and hole diameter of the drill rig.

Rig Mobility
Evaluate the accessibility and mobility needs of the drilling site. If space is limited on site or frequent relocations are required, choose a rig that is compact and easily transportable.

Power Source
Determine the source of power for the drill rig, such as diesel, electric, or hydraulic. Consider factors such as power availability, environmental regulations, and operating preferences.

Rig Capacity and Performance
Consider the drilling speed, torque, and drilling capacity of the drill rig. A rig with a larger capacity can handle larger projects more efficiently.

Support and Service
Evaluate the availability of spare parts, technical support, and after-sales service provided by the manufacturer. A reliable support network ensures seamless operation and timely maintenance.

Budget
Develop a budget and compare prices from different manufacturers or suppliers. Consider long-term ownership costs, including maintenance, spare parts, and operating expenses.

Safety Features
Ensure that the rig meets safety standards and has the necessary safety measures to protect the operator and the drilling operation itself.

How to Maintain DTH Drilling Rig

Regularly check the hydraulic oil of the down-the-hole drill rig
The down-the-hole drill rig equipment is a semi-hydraulic vehicle, that is, except for the use of compressed air for impact, the rest of the functions are realized by the hydraulic system. Therefore, the quality of the hydraulic oil is crucial to the normal operation of the hydraulic system.
1) Open the hydraulic oil tank and check whether the color of the hydraulic oil is clear and transparent. If there is emulsification or deterioration, it must be replaced immediately. If the drilling rig is used frequently, the hydraulic oil should generally be replaced once every six months. It is strictly forbidden to mix two hydraulic oils!
2) The special hydraulic oil for down-the-hole drills is anti-wear hydraulic oil, which contains antioxidants, rust inhibitors, anti-foaming agents, etc., which can effectively prevent the early wear of hydraulic components such as oil pumps and hydraulic motors. Commonly used anti-wear hydraulic oils include: YB-N32, YB-N46, YB-N68, etc. The larger the suffix number, the higher the kinematic viscosity of the hydraulic oil. According to the ambient temperature, YB-N46 or YB-N68 hydraulic oil with higher viscosity is generally used in summer, and YB-N32 and YB-N46 hydraulic oil with lower viscosity is used in winter. In view of the fact that some anti-wear hydraulic oils are still marked with old brands, such as YB-N68 marked as 40# thickened hydraulic oil, YB-N46 and YB-N32 marked as 30# and 20# respectively, users must recognize the model when purchasing.

Clean the oil tank and oil filter of the down-the-hole drilling rig regularly
Impurities in the hydraulic oil will not only cause failure of the hydraulic valve, but also aggravate the wear of hydraulic components such as the oil pump and hydraulic motor. Therefore, we set up an oil suction filter and an oil return filter in the structure to ensure the clean circulation in the system.

Clean the oil mist of the down-the-hole drill and add lubricating oil in time
Since compressed air often contains moisture and the pipeline is not clean, after a period of use, a certain amount of moisture and impurities will often remain at the bottom of the oil mist, affecting the lubrication and life of the impactor. Therefore, when it is found that the oil mist is not oiled or there is moisture and impurities in the oil outlet or the oil mist, it must be removed in time. The down-the-hole drill uses an impactor to achieve impact drilling. Good lubrication is a necessary prerequisite for ensuring the normal operation of the impactor. When adding lubricating oil, the main air intake valve must be closed first, and then the impact air valve is opened to remove the residual air in the pipe to avoid hurting people.

Pay attention to the running-in and oil change of the diesel engine
The diesel engine is the power source of the entire hydraulic system, which directly affects the climbing ability, propulsion (lift) force, rotary torque, and drilling efficiency of the drilling rig. Timely maintenance is the prerequisite for the drilling rig to achieve optimal efficiency.

Certifications

Frequently Asked Questions

Q: What hole diameter do you drill for a DTH?

A: The optimal hole diameter range for a DTH drill is 90mm (3.5”) to 254mm (10”). Smaller holes are usually drilled with a top hammer drill and larger holes are usually drilled with a rotary drill. As a rule of thumb, the smallest hole diameter a DTH hammer can drill is its nominal size.

Q: What types of action are involved in DTH drilling?

A: The hammer strikes the rock downward as the drill string rotates. The drill bit gets its striking force from a piston inside the hammer driven by compressed air. This action, along with the rotary motion of the drill string, effectively crushes the rock.

Q: What is the difference between rotary and DTH?

A: Both TH and DTH are percussive drilling methods. Rotary uses a high pull-down weight on a rotating drill bit to crush the rock. TH is typically used for drilling small diameter holes, DTH is used for a medium range of hole sizes, and rotary can drill medium to large diameter blast holes.

Q: What is the formula for drill bit diameter?

A: The tap drill bit diameter is equal to the nominal diameter minus the pitch. I used this simple formula to quickly calculate the appropriate tap drill bit diameter. The tap drill bit diameter is equal to the nominal diameter minus the pitch. For example, the drill bit size for 3/8-16 thread is 0.375 0.0625 (pitch) = 0.312 inches.

Q: What is the full name of a DTH drill?

A: DTH is an abbreviation for "down-the-hole," and its name comes from the fact that the impact mechanism follows the drill bit into the hole. Depending on the application, down-the-hole drills can be divided into surface and underground.

Q: How does a DTH hammer work?

A: In a pneumatic DTH hammer, a piston moving at a speed v0 collides with the drill bit. Then, a stress wave begins to propagate through the drill bit toward the rock and from the impact face back through the piston.

Q: What is the down-the-hole drilling method?

A: A down-the-hole hammer uses a rotary impact cutting action by using a button drill bit. This system is best suited for strong formations and has excellent penetration rates. Compressed air provides the impact energy to drive the hammer. The resulting exhaust removes rock cuttings.

Q: What is the difference between a top hammer and an in-hole?

A: The main difference between the top hammer and down-the-hole drilling methods is where the hammer is attached. The hammer in industrial equipment is in contact with the drill bit during the down-the-hole drilling method. The activity of the top hammer drilling method is concentrated at the very top of the drill string.

Q: What are the three main types of drilling rigs?

A: Drilling rigs come in three sizes: single, double, and triple. These categories refer to how many pipes can fit in the rig's mast. On a single rig, the mast can hold one pipe. A double rig can hold two, and a triple rig can hold three.

Q: What is down-the-hole drilling and how is it performed?

A: In down-the-hole drilling, a hammer is attached to the lower end of the drill pipe. The hammer, which is mounted on the drill bit, is activated by the addition of compressed air and driven into the ground - rotating and impacting at the same time.

Q: What kind of rock is down-the-hole drilling mainly used for?

A: This method is mainly used for hard to very hard rock and/or to penetrate large boulders.

Q: What is the maximum hole diameter for production drilling?

A: The maximum hole diameter for production drilling is the nominal hammer size plus 25mm (1”), so for a 102mm (4”) hammer the maximum hole diameter is 127-130mm (5”).

Q: What was a milestone in the advancement of DTH drilling equipment?

A: In the late 1960s, the button drill bit was introduced. This was a milestone in the advancement of DTH drilling equipment, allowing drill bit life to reach unprecedented levels.

Q: What is “Down-the-Hole” (DTH) Drill bits, how are they used?

A: Down-the-hole drill bits are used with down-the-hole hammers to drill holes in a variety of rock types. Our drill bits are designed with a spline drive to rotate the drill bit in the ground. Drill bits are available in a variety of different sizes and configurations, so a variety of hole sizes can be drilled in different ground conditions.

Q: What is the purpose of the flushing current in down-the-hole drilling?

A: The flushing current collects the loose drill cuttings and transports them upward.

Q: Where is it used?

A: Down-the-hole drilling is commonly used in the mining industry (blasthole drilling), construction sites, drilling water wells, and the oil and gas industry.

Q: What are the advantages of down-the-hole drilling?

A: Down-the-hole drilling offers several advantages over top hammer drilling, and is suitable for larger, deeper holes in medium-hard formations. Because the hammer is at the bottom of the hole, there is minimal power loss as the hole gets deeper. This means that energy is not lost in the drill string, and the penetration rate does not drop significantly with depth, provided that the back pressure in the hole does not rise significantly. Down-the-hole drilling is best suited for holes with a diameter of 4-10 inches, but there are some exceptions.

Q: How to use a down-the-hole drill?

A: Equipment preparation: Make sure the down-the-hole drill is in good working condition and check whether the equipment is operating normally. Select the appropriate drill bit and drilling tools according to actual needs and install them. Make sure there are no obstacles around the work area and keep a safe distance.
Soil survey: Before starting to drill, conduct soil surveys to determine the underground conditions and rock layer distribution in order to select appropriate drilling tools. Design a drilling plan based on the survey results, including parameters such as hole diameter and depth.
Drilling operation: Carefully review and follow the instruction manual and safety operating procedures of the down-the-hole drill. Mark the drilling location at the construction site and use appropriate equipment for ground drilling. As needed, underground rotary drilling, flushing and suction of discharged mud can be performed. Control the depth and angle of the drilling according to design requirements.
Safety measures: Operators must wear personal protective equipment, such as safety helmets, safety shoes, masks, etc. Comply with relevant safety regulations to ensure the safety of personnel and equipment in the surrounding area. Regularly inspect and maintain the equipment to ensure its normal operation.

Q: What should be paid attention to when operating a down-the-hole drill?

A: 1). Familiar with the equipment: Before using the down-the-hole drill, the operator should carefully read and familiarize himself with the operating instructions of the down-the-hole drill, and understand the structure and performance characteristics of the equipment.
2). Strictly follow safety regulations: Operators should abide by the local safety operating procedures and wear personal protective equipment as required to ensure the safety of themselves and others.
3). Reasonable selection of drilling tools: According to different geological conditions and construction requirements, select suitable drill bits and drilling tools to improve work efficiency and construction quality.
4). Control drilling parameters: According to design requirements, reasonably control parameters such as drilling depth, angle and aperture to ensure the accuracy and stability of drilling.
5). Regular maintenance of equipment: Regularly maintain and maintain the down-the-hole drill, check the working status of the equipment and the wear of parts, and replace and repair them in time.
6). Monitoring during drilling: During the drilling process, observe the drilling situation in time, and adjust and control as needed to ensure construction quality.
7). Clean up the construction site: After completing the drilling, clean up the construction site in time, remove debris and residues, and ensure that the surrounding environment is clean.

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