Official Export Subsidiary of Kaishan Group (Est. 1956) | Quzhou Manufacturing Base
Our Quzhou engineering desk calculates the exact borehole diameter, rock hardness, and necessary CFM/Bar ratio for your project.
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Kaishan DTH Drilling Rigs
Heavy-duty surface crawlers and integrated rigs for open-pit mining, quarry blasting, and slope stabilization. High penetration rate and anti-jamming hydraulic system.
EQUIPMENT CATEGORIES
Product Summary: Kaishan High Air Pressure DTH Hammers are precision-engineered percussive rock drilling tools that convert compressed air into high-frequency impact energy to fracture hard rock formations (f=6–20). Featuring an advanced valveless, footvalve-free design, the K-series (K3, K4, K5, K6, K8, and K10) operates at working pressures of 10 to 35 bar (1.0–3.5 MPa) across hole diameters from ⌀90 mm to 311 mm (3.5" to 12"). By eliminating vulnerable plastic foot valves, these hammers achieve 15%–30% faster penetration rates, reduce oil consumption by 10%, and fit standard international shanks including DHD340, DHD350, DHD360, DHD380, and COP series.
In down-the-hole (DTH) percussion drilling, the drill rig, portable air compressor, and downhole string form an integrated system. The DTH hammer is the critical downhole engine: mounted directly behind the button bit, its reciprocating internal piston strikes the bit shank continuously at frequencies up to 20–31 Hz, transmitting impact shock waves directly into rock without energy loss through long drill rods.
Kaishan's next-generation K-series hammers are optimized for demanding open-pit bench blasting, dimensional quarrying, civil foundation anchoring, and geothermal water well drilling. All internal components undergo computer-controlled vacuum carburization and cryogenic hardening, ensuring high structural fatigue resistance and long service life.
Traditional hammers rely on plastic foot valves on the bit shank that frequently crack or expand under heat. Kaishan's footvalve-free design prevents downhole sticking and eliminates broken nylon debris.
The streamlined valveless air distribution circuit delivers higher impact frequencies (up to 31 Hz at 17 bar) and superior single-blow kinetic energy, accelerating penetration in hard rock.
Tightly toleranced internal clearances minimize pneumatic leakage, cutting overall air consumption while reducing rock drill lubricating oil usage by approximately 10%.
The top sub, external wear sleeve cylinder, and drive chuck connect via multi-step heavy-duty ACME threads, allowing rapid field servicing and parts replacement without specialized hydraulic breakout benches.
| Model | K3 | K4 | K5 | K6 | K8 | K10 |
|---|---|---|---|---|---|---|
| Length(Without Bit) | 889mm | 985mm | 1107mm | 1238mm | 1355mm | 1484mm |
| Weight(Without Bit) | 25kg | 40kg | 67kg | 111kg | 192kg | 302kg |
| Extemal Diameter | Φ82mm | φ99.5mm | Φ125mm | Φ148mm | Φ185mm | Φ225mm |
| Bit Shank | K3**IR3.5 | K3**COP44/DHD340 | K5**COP45/DHD350 | K6*COP64/DHD360 | K8**COP84/DHD380 | K10* |
| Hole Range | φ90-Φ105mm | Φ110-φ130mm | Φ135-Φ165mm | Φ155-Φ190mm | Φ195-φ254mm | φ254-Φ311mm |
| Connection Thread | API 2 3/8"REG | API 2 3/8"REG | API 2 3/8"REG API 3 1/2"REG |
API 3 1/2"REG | API 4 1/2"REG | API 5 1/2"REG |
| Working Pressure | 1.0-2.5Mpa | 1.0-2.5Mpa | 1.0-2.5Mpa | 1.0-2.5Mpa | 1.0-2.5Mpa | 1.7-3.5Mpa |
| Impact Rate at 17 Bar | 25Hz | 31Hz | 28Hz | 25Hz | 22Hz | 20Hz |
| Recommended Rotation Speed | 25-40rpm | 22-35rpm | 20-35rpm | 20-30rpm | 15-25rpm | 20-40rpm |
| Air Consumption | 1.0 Mpa:4.8m³/min | 1.0Mpa:6m²/min | 1.0 Mpa:7 m²/min | 1.0 Mpa:9 m²/min | 1.0 Mpa:12 m²/min | 1.0 Mpa:22m²/min |
| Air Consumption | 1.8 Mpa:9.6m²/min | 1.8 Mpa:10 m²/min | 1.8 Mpa:14 m²/min | 1.8 Mpa:18 m³min | 1.8 Mpa:23 m²/min | 1.8 Mpa:40 m²/min |
| Air Consumption | 2.4Mpa:12.6m²/min | 2.4 Mpa:15 m²/min | 2.4 Mpa:19 m³/min | 2.4 Mpa:26m²/min | 2.4 Mpa:31 m²/min | 2.4 Mpa:65m²/min |
|
Engineering Innovations & Valveless Advantages
Zero Foot Valve FailureCompletely free from plastic foot-valve fractures, thermal expansion, or downhole clogging. Eliminates drilling interruptions caused by broken nylon rings. 15%–30% Faster DrillingSimplified internal airflow and an optimized piston-to-bit mass ratio deliver higher single-blow impact power and strike frequencies up to 31 Hz at 17 bar. 10% Lower Oil ConsumptionTight manufacturing tolerances minimize pneumatic leakage, reducing overall compressed air demand and saving approximately 10% on rock drill lubricating oil. Easy Maintenance & StrippingTop sub, wear cylinder, and drive chuck connect via multi-step heavy-duty threads, allowing quick on-site disassembly without specialized hydraulic benches. Kaishan K-Series Model Matrix & Technical DataK3 (3") & K4 (4") Models
K5 (5") & K6 (6") Models
K8 (8") & K10 (10") Models
Applications & Supply Terms
Supply Specifications: Brand: Kaishan | Minimum Order Quantity: 1 set | Export Packaging: Standard seaworthy cases | Lead Time: 7–10 days | Payment: L/C, T/T, Western Union.
Frequently Asked Questions (FAQ)Q: What are the main benefits of a valveless, footvalve-free DTH hammer?A: Valveless hammers eliminate the vulnerable plastic foot valve on the bit that easily cracks or expands under high temperatures. This prevents downhole tool sticking, delivers higher impact frequency, and accelerates penetration by 15%–30%. Q: Which hammer model matches 115mm–130mm drill bits?A: The Kaishan K4 (4-inch) hammer is engineered specifically for ⌀110–130 mm hole diameters using standard DHD340 or COP44 bit shanks with an API 2 3/8" REG top connection. |
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Founded in 2022 in Quzhou City, Zhejiang Province. Operating as the global integrated export arm of Kaishan Group, delivering heavy-duty DTH drill rigs, water well exploration machinery, and screw air compressors worldwide.
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