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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

Category
Kaishan YT Series Air-Leg Pneumatic Rock Drill (YT24 / YT28)
Kaishan YT Series Air-Leg Pneumatic Rock Drill (YT24 / YT28)
Kaishan YT Series Air-Leg Pneumatic Rock Drill (YT24 / YT28)
Kaishan YT Series Air-Leg Pneumatic Rock Drill (YT24 / YT28)

Kaishan YT Series Air-Leg Pneumatic Rock Drill (YT24 / YT28)

Kaishan YT Series Air-Leg Rock Drills (YT24, YT28/YT28A) are heavy-duty pneumatic jackleg drills engineered for blast-hole mining, quarrying, and tunneling (⌀34–42mm, up to 5m depth). Operating at 0.4–0.63 MPa, they deliver high impact energy with low air consumption.
Versatile Pusher Leg: Mounts on FT160 telescopic air legs for horizontal and inclined drilling.
Standard Shank: Fits standard Hex 22 mm × 108 mm tapered drill rods and integral steels.
Wet Dust Suppression: Air-water interlock system ensures clean underground operation.
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  • Product Detail Introduction

Core Engineering Features & Performance Advantages

High-Frequency Impact Mechanism

Operates at 0.4–0.63 MPa working pressure, delivering 65J to 78J single-blow impact energy at 31–37 Hz. Ensures rapid penetration in medium-hard to tough rock formations (f=8–18).

Multi-Angle Air-Leg Integration

Pairs seamlessly with FT160 series telescopic support pusher legs, enabling precise drilling in horizontal, inclined, and upward overhead directions with minimal operator physical strain.

Centrally Grouped Controls

All operating controls—including throttle handle, air-leg feed regulator, and water flushing switch—are concentrated on the back-head console for quick starting and flexible maneuvering.

Water-Flushing Dust Suppression

Integrated water-air interlock system ensures simultaneous center water flushing during drilling, effectively suppressing underground dust and maintaining clear site sightlines.

Kaishan Air-Leg Rock Drill Specifications Matrix

Model No

YT23

YT24

YT26

YT27

YT28

YT29A

MZ7665

Weight               (kg)

24

24

26

27

28

27

26

Length               (mm)

628

678

690

668

661

659

720

Cylinder Dia*Stroke   (mm)

76*60

70*70

95X60

80*60

80*60

82*60

76*70

Working Pressure     (Mpa)

0.4-0.63

Impact energy         (J)

≥65

 ≥65

 ≥64

≥75.5

≥70

≥78

≥70

Impact frequency      (Hz)

≥37

 ≥31

≥36.5

≥36.7

≥37

≥37

≥37

Air consumption       (L/S)

≤78

 ≤67

 ≤55

≤83.3

≤81

≤88

≤81

Hose size            (mm)

19

25

25

25

25

25

25

Rork drill hose diameter(mm)

34-42

34-42

34-42

34-42

34-42

34-42

34-42

Rock drill hose depth   (m)

5

5

5

5

5

5

5

Shank size           (mm)

22x108

22x108

22x108

22x108

22x108

22x108

22x108

Core Engineering Features & Performance Advantages

High-Frequency Impact Velocity

Operates at 0.4–0.63 MPa pneumatic pressure, delivering 65J to 78J impact energy at frequencies up to 31–37 Hz for rapid penetration in medium-hard to tough rock (f=8–18).

Multi-Angle Pusher Leg Integration

Pairs seamlessly with FT160 series telescopic air legs to drill horizontal, inclined, and upward holes with minimal operator physical fatigue.

Centralized Back-Head Controls

Consolidates throttle lever, air-leg feed regulator, and water flushing controls in one ergonomic cluster for responsive starting and rapid speed adjustments.

Interlocked Wet Dust Suppression

Integrated air-water interlocking mechanism coordinates center water flushing with percussive drilling, suppressing underground rock dust for safer sightlines.

Kaishan YT Series Model Specifications

YT24 Jackleg Rock Drill (Medium-Duty)

  • Weight & Length: 24 kg | 678 mm
  • Cylinder Bore × Stroke: 70 mm × 70 mm
  • Impact Energy & Frequency: ≥65 J @ ≥31 Hz
  • Air Consumption: ≤67 L/s (4.0 m³/min) @ 0.63 MPa
  • Drilling Hole & Depth: ⌀34–42 mm | Up to 5–6 meters
  • Shank Specification: Hex 22 mm × 108 mm (±1 mm)

YT28 / YT28A Rock Drill (Heavy-Duty)

  • Weight & Length: 28 kg | 661 mm
  • Cylinder Bore × Stroke: 80 mm × 60 mm
  • Impact Energy & Frequency: ≥70 J @ ≥37 Hz
  • Air Consumption: ≤81 L/s (4.8 m³/min) @ 0.63 MPa
  • Drilling Hole & Depth: ⌀34–42 mm | Up to 5–6 meters
  • Shank Specification: Hex 22 mm × 108 mm (±1 mm)

Universal Line & Accessory Standards

  • Working Pressure Range: 0.40 – 0.63 MPa (4.0 – 6.3 bar)
  • Air Hose Inner Diameter: 25 mm (1.0 inch)
  • Water Hose Inner Diameter: 13 mm (0.5 inch)
  • Compatible Pusher Legs: FT160BD (Short) / FT160BC (Long)
  • Matched Line Lubricator: FY200B Oil Oiler (200 ml capacity)
  • Drill Steels: H22 integral steels & 7°/11° tapered rods

Field Operation & Preventive Maintenance Rules

  • Pre-Operation Flushing: Clean out anti-rust storage grease and blow air through supply hoses before connecting to eliminate internal dust clogging.
  • Pressure Regulation: Maintain water pressure 0.10–0.15 MPa lower than operating air pressure to prevent water backflow into the cylinder housing.
  • Continuous Lubrication: Never run without line oil. Fill the FY200B lubricator with rock drill oil and regulate feed to replenish every 1–2 hours.
  • Shift-End Purge: Shut off water supply first, then run the drill on air for 20–30 seconds to purge moisture and prevent internal piston rust.
  • Operator Safety: Hearing protection (earmuffs/plugs) and safety goggles are strictly required during pneumatic percussive operation.

Primary Industrial Applications

  • Underground Mining & Drifting: Production blast-hole and roof bolting in coal, iron, gold, and non-ferrous mines.
  • Railway & Highway Tunneling: Heading excavation, side wall trimming, and rock consolidation.
  • Stone Quarries & Bench Blasting: Block splitting, secondary fragmentation, and trenching.
  • Water Conservancy & Hydropower: Dam foundation anchoring, slope stabilization, and culvert excavation.

Frequently Asked Questions (FAQ)

Q: What is the main difference between Kaishan YT24 and YT28?

A: The YT24 (24 kg) features a 70 mm bore with lower air consumption (4.0 m³/min), making it ideal for medium-duty mining and smaller compressors. The YT28 (28 kg) features an 80 mm bore with higher impact energy (≥70 J) and frequency (≥37 Hz) for faster penetration in hard, tough rock.

Q: Can the YT series be operated without an air leg?

A: The YT24 and YT28 are primarily designed to mount on FT160 pusher air legs for horizontal and inclined drilling. For pure vertical downward hole drilling without an air leg, hand-held models (such as the Y24 or Y26) are recommended.

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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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