自由容器
Double-TelescopicHydraulicSupport Legs
More height range from
a compact closed length.
Two-stage hydraulic legs for
powered roof supports，
engineered for wider mining-
height coverage and high-
force longwall duty.
Higher Extension Ratio
Two-stage design delivers
more extension from the same closed length.
Wider Mining-Height Range
Accommodates a broader range of seam heights for greater application flexibility.
Stage-Matched Yield Control
Independent stage control for stable support and optimized force performance.
Mining-Duty Sealing
Heavy-duty seals and wipers resist contamination for long service life in harsh conditions.
自由容器
Popular Double-TelescopicSupport Legs
Reference configurations for medium-, high- and wide-range powered roof supports
DT-360/260-1200 Double-Telescopic Support Leg
DT-420/300-1600 Heavy-Duty Double-Telescopic Support Leg
DT-360/260-1200 Double-Telescopic Support Leg
Quick Details
· 2 telescopic stages
· Stage 1 bore: 360 mm
· Stage 2 effective diameter: 260 mm
· Stage stroke: 650 + 550 mm
· Reference pressure: 31.5 MPa
· Application: medium / high-seam roof support
Packaging & Delivery
· Ports capped and sealed
· Steel frame or wooden case
· Container/flat-rack/break-bulk
Applications
· Medium-to-high seam shields
· Variable-height longwall faces
· Replacement leg programs
自由容器
DT-420/300-1600 Heavy-Duty Double-Telescopic Support Leg
Quick Details
· 2 telescopic stages
· Stage 1 bore:420 mm
· Stage 2 effective diameter: 300 mm
· Stage stroke: 850 + 750 mm
· Reference pressure: 31.5 MPa
· Application: high-seam/large-range roof support
Packaging & Delivery
· Retracted for shipment
· Reinforced export frame
· Container/flat-rack/break-bulk
Applications
· High-seam roof supports
· Large mining-height supports
· Retrofit & remanufacturing
自由容器
Custom Double-Telescopic Hydraulic Support Legs
Built around your closed height，extended height and
required force.
Stage 1& Stage 2 Bore
Match stage diameters to force and support geometry.
Stage Stroke &
Length Ratio
Balance closed length, extended height and travel.
Mounting Interfaces
Upper and lower connectionsmatched to
your support.
Stage Seals & Surface Protection
Protect both telescopic interfaces in harsh mines.
Valve & Hydraulic Interface
Configure pressure, yield control and oil ports.
Sensors & Testing
Add monitoring, pressure tests and stroke checks.
Successful Cases
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Double-Telescopic HydraulicSupport Legs FAQ
Key answers for powered roof support manufacturers
and maintenance buyers
1. What are Double-Telescopic Hydraulic Support Legs?
Double-Telescopic Hydraulic Support Legs use two
telescopic stages to provide a larger extension range in a
compact structure.
2. Where are they used?
Double-Telescopic Hydraulic Support Legs are used in
hydraulic roof supports, mining equipment and heavy-
duty support systems.
3. What bore sizes are available?
Double-Telescopic Hydraulic Support Legs can be
customized with different first-stage and second-stage
bore sizes.
4. What stroke lengths are available?
Double-Telescopic Hydraulic Support Legs can be
designed with different stage strokes and overall
extension lengths.
5. What working pressures are available?
Double-Telescopic Hydraulic Support Legs can be
configured for different working pressures and support
forces.
6. What mounting options are available?
Double-Telescopic Hydraulic Support Legs can use
customized base, pin and connection interfaces.
7. What sealing options are available?
Double-Telescopic Hydraulic Support Legs can use
heavy-duty seals and wear-resistant sealing systems for
demanding environments.
8. Can they be customized?
Yes. Double-Telescopic Hydraulic Support Legs can be
customized by bore, stroke, pressure, mounting and
surface protection.