Low Air-Pressure DTH Hammer
The down-the-hole dth hammer is a device that uses compressed air as a power source and uses the reciprocating motion of the piston in the hammer to impact the drill bit to break the rock. The down-the-hole dth hammer is a working device of the down-the-hole drill. According to the working pressure of the dth hammer, it can be divided into low-pressure dth hammer (working pressure is 0.5~0.7Mpa), medium-pressure dth hammer (0.7~1.2Mpa) and high-pressure dth hammer(above 1.2Mpa); according to the gas distribution method and structural characteristics of the dth hammer, it can be divided into valved and valveless types; according to the formation of the central through hole of the down-the-hole dth hammer, it can be divided into ordinary down-the-hole dth hammer and reverse circulation down-the-hole dth hammer.
Application :
It is widely used in large-scale open-pit and underground ore mining, anchoring engineering, quarrying and rock drilling, water well geothermal mining, construction engineering rock drilling and large-scale engineering construction, etc.
Features
1 The operating air pressure are between 0.5Mpa and 0.7Mpa
2 Valveless hammers.
3 Simple structure, easy to assemble and to disassemble, long life span.
4 Higher impact frequency and faster drilling speed.
5 Lower air consumption and lower oil consumption. A hole can be drilled on the check valve to provide more efficient cuttings discharge.
6 Especially suitable for quarrying.
Model | L2.5 | L3 | L30 | L40 |
Item Description | Weight (kg) | |||
Top Sub | 2.03 | 2.89 | 2.75 | 4.7 |
Check Valve Head | 0.01 | 0.01 | 0.01 | 0.005 |
Check Valve Bond | 0.02 | 0.02 | 0.02 | 0.044 |
Spring | 0.01 | 0.01 | 0.01 | 0.01 |
Washer | 0.02 | 0.01 | 0.102 | |
Spacer | 0.01 | 0.01 | 0.01 | |
Cap | 0.24 | 0.43 | 0.07 | 0.1 |
Grub Screw | 0.01 | 0.01 | ||
Spool | 0.04 | 0.01 | ||
Sellock Pin | 0.01 | |||
Disc Valve | 0.03 | 0.05 | ||
Location PIN | 0.01 | |||
Air Distributor | 0.81 | 1.41 | 1.04 | 2.1 |
Inner Cylinder | 1.3 | 2.01 | 2.01 | 2.8 |
Piston | 2.78 | 4.13 | 4.26 | 6.8 |
Outer Cylinder | 4.64 | 6.62 | 6.2 | 8.6 |
Guide Bush | 0.78 | 0.01 | 1.5 | |
Retaining Bush | 0.01 | 0.01 | 0.001 | |
Spring | 0.01 | 0.01 | 0.01 | 0.001 |
Locking Pin | 0.01 | 0.01 | 0.004 | |
Drive Sub | 1.05 | 1.82 | 1.82 | 3.8 |
Retaining Pin | 0.01 | 0.01 | 0.02 | 0.029 |
Technical Date | ||||
Model | L2.5 | L3 | L30 | L40 |
Length (Without Bit) | 763mm | 797mm | 750mm | 835mm |
Weight(Without Bit) | 12kg | 20kg | 20kg | 30.8kg |
External Diameter | Φ66mm | Φ80mm | Φ80mm | Φ98mm |
Bit Shank | L2.5**CIR80 | L3**CIR90 | L3**CIR90 | L4**CIR110 |
Hole Range | Φ68-Φ88mm | Φ90-Φ110mm | Φ90-Φ110mm | Φ110-Φ150mm |
Connection Thread | 48x10 | 48x10 | 48x10 | API 2 3/8" REG |
Working Pressure | 0.5-0.7Mpa | 0.5-0.7Mpa | 0.5-0.7Mpa | 0.5-0.7Mpa |
Impact Rate at 17 Bar | 15Hz | 15Hz | 15Hz | 14Hz |
Recommended Rotation Speed | 25-40 r/min | 25-40 r/min | 25-40 r/min | 25-40 r/min |
Air Consumption | 0.7Mpa: 5m³/min | 0.7Mpa: 8m³/min | 0.7Mpa: 8m³/min | 0.7Mpa: 11m³/min |