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HCYY11112005 Aerial Work Platform Main Boom Luffing Cylinder
The HCYY11112005 is a precision-engineered aerial work platform main boom luffing cylinder designed to control boom angle adjustment on telescopic boom lifts, articulating boom lifts, and truck-mounted aerial platforms. The luffing cylinder governs the elevation angle of the main boom relative to the turntable, allowing the operator to adjust working height by changing boom pitch rather than extending the boom length. This makes boom angle accuracy a critical factor in both reach and platform leveling performance.
Unlike lifting cylinders that operate primarily in compression, boom luffing cylinders experience combined loading — compression when raising the boom, and tension when the boom weight creates a moment that loads the cylinder in the opposite direction during lowering. The HCYY11112005 is designed to handle these bidirectional loads with a rod diameter and wall thickness that maintain structural integrity throughout the full boom luffing range.
For aerial platform manufacturers requiring a main boom luffing cylinder with high positioning accuracy and long fatigue life, the HCYY11112005 offers a verified technical specification set and OEM manufacturing capability that supports both new platform development and aftermarket replacement supply.
Hydraulic cylinder installation positions on aerial work platforms, including lifting cylinder, boom luffing cylinder, telescopic cylinder, leveling cylinder and steering cylinder.
Installation Position and Function
The HCYY11112005 main boom luffing cylinder is installed between the turntable structure and the underside of the main boom, typically pivoting from the turntable at the cap end and connecting to a lug on the boom lower flange at the rod end. This diagonal installation converts cylinder linear movement into boom rotational movement around the main boom pivot pin.
When hydraulic pressure is applied to the piston side, the cylinder extends and pushes the boom upward, increasing the boom elevation angle. The speed of elevation is controlled by the hydraulic valve flow rate, which the operator adjusts via the platform control system. When the boom is lowered, pressure is directed to the rod side, or the piston side is allowed to return under controlled back pressure, bringing the boom down at a consistent rate determined by the counterbalance valve setting.
The luffing cylinder is a critical positioning actuator: the boom must hold its angle precisely without drift when the operator releases the control input and while working loads are applied to the platform. The HCYY11112005 works in conjunction with a counterbalance valve or load-holding check valve to prevent uncontrolled boom lowering due to external loads or internal cylinder leakage. The cylinder sealing system is therefore specified to minimize internal bypass leakage, maintaining boom position accuracy over extended holding periods.
Key Features
- Designed for precise boom angle control with minimal position drift
- High load capacity for main boom weight and full working platform payload
- Bidirectional load rating — handles both compression and tension from boom moment reversal
- Low internal leakage piston seal for load-holding accuracy
- Hard chrome rod for corrosion and fatigue resistance under repeated cycling
- Robust clevis and pin-bore mounting at both ends for secure boom pivot attachment
- Compatible with counterbalance valve and load-holding valve integration
- OEM customization for boom geometry, pressure rating, and mounting interface
Technical Specifications
| Параметр | Құндылық |
|---|---|
| Модель | HCYY11112005 |
| Cylinder Bore | 100 mm |
| Rod Diameter | 70 mm |
| Stroke | 1050 mm |
| Working Pressure | 20 MPa |
| Maximum Pressure | 28 MPa |
| Installation Distance | 1430 mm |
| Салмақ | 48 kg |
Engineering Design Advantages
Hydraulic Performance
The 100 mm bore at 20 MPa working pressure generates the high push force required to elevate the main boom and its full working load payload from a low angle — typically the most demanding point in the luffing cycle where the moment arm is longest and gravity loading on the boom is highest. The 20 MPa working pressure rating provides good force density while remaining compatible with standard aerial platform hydraulic system pressure ratings. The larger bore also provides adequate oil volume for smooth, consistent boom elevation speed without excessive velocity sensitivity to valve position.
Structural Strength
The 70 mm rod diameter is specified to handle the combined axial and bending loads generated by the diagonal installation geometry of the luffing cylinder. As the boom angle changes, the cylinder installation angle relative to the boom changes, creating a bending component at the rod guide. The 70 mm rod, combined with the bearing length in the gland, provides adequate bending resistance to prevent eccentric rod loading that would cause accelerated seal and guide wear. The 1050 mm stroke reflects the angular sweep needed for the main boom to travel from its lowest to highest elevation position on this platform class.
Sealing Reliability
The piston seal system uses low-bypass composite seals that maintain tight internal leakage limits essential for boom position holding. The rod seal incorporates an anti-extrusion ring rated for 28 MPa peak pressure to prevent seal deformation during pressure spikes generated by load impacts or hydraulic valve switching transients. The gland design provides a long bearing surface to support the rod under lateral loads without transferring bending stress directly to the rod seal.
Беттік өңдеу
The piston rod surface finish is maintained to Ra 0.2 or better on the sealing area to ensure consistent rod seal contact and minimize seal wear. Hard chrome plating thickness is specified to withstand the abrasion from continuous seal contact over the 1050 mm stroke cycle length, which is longer than most hydraulic cylinder applications and therefore demands a thicker chrome deposit for adequate service life. The cylinder body exterior is treated for outdoor weather resistance to handle the exposure conditions of construction and industrial sites.
Durability
At 48 kg, the HCYY11112005 reflects the structural mass required for a main boom cylinder handling the largest forces in the aerial platform hydraulic circuit. The cylinder is fatigue-rated for the number of cycles expected over the service life of the platform, based on the aerial equipment industry standard duty cycle assumptions. Weld quality is maintained to pressure vessel standards, and each completed cylinder undergoes hydrostatic testing at 1.5 times the maximum working pressure before release from the production line.
Қолданбалар
The HCYY11112005 main boom luffing cylinder is specified for the following aerial work platform equipment:
- Telescopic Boom Lift: Primary luffing actuator for straight-boom elevation angle adjustment
- Articulating Boom Lift: Lower boom luffing function controlling the main boom section
- Truck Mounted Aerial Platform: Main boom elevation cylinder for vehicle-integrated aerial access units
- Mobile Elevating Work Platform (MEWP): Self-propelled boom platform boom angle actuation
OEM Hydraulic Cylinder Manufacturing Capability
Main boom luffing cylinder dimensions are directly linked to the boom geometry and platform working height class. Our manufacturing process for the HCYY11112005 series supports full OEM customization:
- Custom Dimensions: Bore from 80 mm to 160 mm, stroke adjusted to match boom angular sweep requirement
- Drawing Approval: Full dimensional drawing package with mounting, port, and clevis details for engineering review
- Prototype Development: First-article samples with dimensional and pressure performance report
- Sample Production: Pre-production samples for installation verification and durability testing on actual boom structures
- Mass Production: Serial production with delivery scheduling aligned to platform assembly programs
- Quality Inspection: Hydrostatic pressure test, bore finish measurement, dimensional inspection, and surface coating check per unit
Жиі қойылатын сұрақтар
What is the difference between a boom luffing cylinder and a boom lifting cylinder on an aerial platform?
A lifting cylinder raises the entire platform structure — the scissor arms, the lower chassis tower, or the platform stage — vertically. A luffing cylinder changes the angle of the boom around its pivot point, which changes both the working height and horizontal reach of the platform simultaneously. On a telescopic or articulating boom lift, both types are typically present and work in combination.
Can the HCYY11112005 hold boom position without continuous hydraulic pressure?
The cylinder itself is designed with low internal leakage piston seals to minimize position drift. However, the cylinder alone does not provide full load holding — a counterbalance valve or load-holding check valve installed in the circuit is required to maintain boom position when the control input is released. We can advise on appropriate counterbalance valve specifications to match the cylinder working pressure and boom load characteristics.
Is a 20 MPa working pressure compatible with standard aerial platform hydraulic systems?
Yes. Most self-propelled boom lifts and articulating MEWPs operate hydraulic systems in the 17 to 21 MPa range. The HCYY11112005 at 20 MPa working pressure is compatible with these standard system pressures. If your hydraulic system operates at a different pressure — either lower for energy-efficient designs or higher for compact high-force applications — we can adjust the cylinder specification to match your system design pressure.
How is the stroke length determined for a luffing cylinder on a specific boom design?
The stroke is determined by the boom pivot geometry, the cylinder mounting positions on the turntable and boom, and the required angular sweep of the boom from minimum to maximum elevation angle. We use the geometric relationship between these parameters to calculate the required cylinder stroke. If you provide the boom pivot location, cylinder mounting location coordinates, and required angular range, our engineers can calculate the exact stroke required for your design.
What quantity is required for a production order and what are the pricing tiers?
Minimum order quantities and pricing tiers for the HCYY11112005 series are provided in the RFQ response based on your annual volume requirement. We support both small-batch orders for equipment maintenance programs and high-volume serial production for platform manufacturers. Annual commitment pricing is available for customers with regular monthly or quarterly demand.
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