Front-End Telescopic Hydraulic Cylinders

Tonghesheng Machinery is one of the competitive manufacturers and suppliers of high-quality front-end telescopic hydraulic cylinders, and we are also equipped with a professional factory, welcome to buy front-end telescopic hydraulic cylinders products from our company.

 

Front-end telescopic hydraulic cylinders provide the linear force required to elevate dump bodies on heavy-duty tippers, semi-trailers, and rigid dump trucks. Mounted on the exterior front wall of the truck body, this multi-stage single-acting design maximizes lifting leverage, reducing the required hydraulic operating pressure compared to underbody mounting configurations.

Engineered with multiple nested tubular stages (stop-sleeve design), the cylinder delivers a long stroke from a compact collapsed length. The external pin-eye/trunnion mounting configuration reduces bending moments on the body chassis during tipping, optimizing weight distribution and improving overall vehicle stability during material discharge.

 

 

Specification Parameter	Value / Range
Stage Count	3, 4, or 5 stages
Max Working Pressure	190 bar (19 MPa) / 220 bar peak
Bore Diameters (Stage Range)	75 mm to 214 mm
Stroke Length Range	1,500 mm - 9,200 mm
Lifting Capacity Range	15 Metric Tons - 90 Metric Tons
Stage Material	27SiMn Seamless Alloy Steel Tube (Hot Rolled/Cold Drawn)
Tensile Strength (sigma_b)	>= 980 MPa
Yield Strength (sigma_s)	>= 835 MPa
Surface Treatment (OD)	Hard Chrome Plated (25-35 um thickness per stage)
Surface Roughness	Ra <= 0.2 um
Sealing System	Polyurethane (PU) + PTFE Multi-Lip Chevron V-Packing with TPU Scraper
Operating Temperature	-40 deg C to +105 deg C (Standard PU) / -20 deg C to +200 deg C (FKM/Viton options)
Hydraulic Fluid Compatibility	Mineral Oils (ISO VG 32 / VG 46)
Port Interface	SAE / NPT / BSPP Threaded or Flanged Port Options

 

 

27SiMn Alloy Steel Construction: High-yield-strength alloy steel reduces stage wall thickness without compromising structural integrity under lateral bending loads.
Skived and Roller Burnished Bore Surfaces: Cold burnishing work-hardens internal tube walls, achieving surface roughness below Ra 0.2 um to minimize seal friction and prevent internal fluid bypass.
Thick Hard Chrome Plating: Outer tube surfaces receive 25 to 35 microns of hard chrome plating, offering 96-hour salt spray corrosion resistance (ISO 9227 rating 9+).
Multi-Lip Chevron Sealing Packings: Self-adjusting V-packing seals compensate for thermal expansion and flex under off-center loads, preventing low-pressure leaks during partial tipping.
Integrated Solid Stop Rings: Machined stop rings prevent accidental stage over-travel during maximum extension under full pay-load pressure.
Low-Maintenance Bushings: Self-lubricating bronze/composite trunnion and pin bushings absorb impact shocks during heavy off-loading.

 

 

Proper cylinder selection requires balancing geometric kinematics, vehicle stability, and hydraulic system sizing:
Stroke Calculation vs. Dump Angle:
Ensure total stroke (S) achieves the required body dump angle (alpha, typically 45 to 52 degrees depending on material flowability):
S = 2 * L * sin(alpha / 2)
(where L is the distance from the rear hinge pivot to the front cylinder mounting point).
Buckling & Side Load Management:
Front-end cylinders must operate strictly in axial tension/compression. Off-center loading caused by unlevel ground (cross-slopes > 3 deg) induces severe bending moments on extended stages. Choose wider first-stage diameters to increase the section modulus (Z) if operating on soft or uneven terrain.
Oil Displacement & Reservoir Sizing:
Telescopic cylinders require varying oil volumes as diameters decrease with each extending stage. The hydraulic reservoir volume must exceed total cylinder fluid capacity by a minimum of 20-25% to prevent pump cavitation at full extension.
Lowering Speed Control:
Free-fall risk exists due to gravity on the dump body. Incorporate a pressure-compensated proportional flow control valve or cylinder-mounted burst valve to limit max lowering speed to under 0.2 m/s.

 

 

Heavy-Duty Commercial Dump Trucks: 3-axle and 4-axle rigid tipper trucks carrying gravel, sand, or crushed rock.
Tipping Semi-Trailers: 20 ft to 45 ft aluminum or steel dump trailers used in long-haul bulk transportation.
Agricultural Tipping Wagons: Multi-stage tipping trailers handling grain, silage, and biomass.
Mining & Off-Highway Trucks: Rigid-frame haul trucks operating under abrasive conditions in quarries and open-pit mines.
Hooklift & Refuse Collection Vehicles: Municipal waste haulers requiring compact, high-force front mounting configurations.

 

 

[Raw Material Inspection] -> 27SiMn Alloy Tubes (Ultrasonic Flaw Detection)
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[CNC Turning & Machining] -> Precision Lathe Threading & Groove Cutting
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[Deep-Hole Boring & Skiving] -> Skiving & Roller Burnishing (Ra < 0.2 um)
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[Electroplating] -> Chrome Plating Line (25-35 um Thickness)
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[Stage Assembly] -> Cleanroom Multi-Stage Component Nesting & Seal Insertion
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[End Fitting Welding] -> Automated Submerged Arc Welding / Robotic MIG Welding
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[Pressure Testing] -> 100% Factory Hydrostatic Testing

 

 

Every manufactured cylinder undergoes a mandatory quality protocol prior to dispatch:
Hydraulic Pressure Testing: 100% testing at 1.5x working pressure (up to 285 bar) for 5 minutes. Zero pressure drop allowed.
Internal Bypass / Leakage Test: Hold test at full extension to confirm stage-to-stage internal packing integrity.
Chrome Layer Measurement: Magnetic gauge verification of chrome thickness (25 um min); Micro-hardness test (>= 850 HV).
Salt Spray Test (ISO 9227): Sample testing per batch achieving Neutral Salt Spray (NSS) >= 96 hours without red rust.
Dimensional & Concentricity Audit: CMM inspection of eye bushings, trunnion centers, and pin alignment tolerances (+/- 0.05 mm).
Cleanliness Standard: ISO 4406 fluid cleanliness grade 18/16/13 maintained prior to port sealing.

 

 

To receive an accurate engineering calculation and commercial quotation within 24 hours, provide the following parameters:
Dump Body Gross Weight + Payload (Tipping Capacity Required): e.g., 35 Metric Tons.
Body Dimensions: Length (L), Height (H), and Distance from Hinge Axis to Front Mount.
Required Dump Angle (alpha): e.g., 48 degrees.
Target Closed Length / Outer Dimension Envelope: Max allowable space when retracted.
Operating Hydraulic Pressure: System relief setting (e.g., 170 bar or 190 bar).
Preferred Mount Configuration: Pin-to-Pin or Trunnion-to-Eye.
Expected Order Volume & Delivery Schedule: Annual demand or project batch size.

 

 

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