Stacker Reclaimer Skeleton Pitch Cylinder
Stacker Reclaimer Skeleton Pitch Cylinder
A stacker reclaimer moves thousands of tonnes of coal, iron ore, or aggregate per hour — and the skeleton pitch cylinder controls where it all goes. By adjusting the cantilever boom angle, the cylinder directs material onto the correct part of the stockpile during stacking and positions the bucket wheel at the correct height during reclaiming.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Name | Stacker Reclaimer Skeleton Pitch Cylinder |
| Features | Cantilever (boom) pitching action for stacking and reclaiming |
| Bore Diameter | 300 mm – 400 mm |
| Rod Diameter | 200 mm – 320 mm |
| Stroke | 1,000 mm – 4,500 mm |
| Working Pressure | Up to 35 MPa |
| Application | Stacker Reclaimer |
What Is a Stacker Reclaimer and Why Does It Need Pitch Control?
A stacker reclaimer is a large machine used in ports, mines, steel mills, and power plants to stack bulk materials (coal, iron ore, limestone, aggregate, grain) into stockpiles and reclaim them for processing or shipping. The machine has a long cantilever boom (30–60 metres) with a belt conveyor running along its length and a bucket wheel or scraper at the tip.
The skeleton pitch cylinder raises and lowers this cantilever boom. During stacking, the boom pitches upward to deposit material at the top of the stockpile, then gradually lowers as the pile grows. During reclaiming, the boom pitches downward to dig into the stockpile face. The cylinder must hold the boom at precise angles under the combined weight of the boom structure, the conveyor belt (loaded with material), and the dynamic forces from the bucket wheel cutting into compacted material.
Korea Ever-Power engineers the skeleton pitch cylinder for each stacker reclaimer model within the offshore hydraulic cylinder product range. Browse the chaser pitch (#28) and belt tensioning (#29) cylinders for the complete stacker reclaimer system.
Stacker Reclaimer Hydraulic Cylinder Family
Korea Ever-Power manufactures three hydraulic cylinder types for stacker reclaimers — each for a different mechanism:
Controls the cantilever boom angle. The primary actuator for stacking height and reclaiming depth. Bore 300–400 mm, 35 MPa.
Controls the tail belt mechanism angle. Adjusts the transfer point where material exits the stacker reclaimer. Same bore and pressure range.
Maintains constant belt tension on the conveyor system. Smaller bore (80–180 mm), shorter stroke (500–1,500 mm).
Key Advantages for Bulk Material Handling
- 35 MPa working pressure — the highest in the stacker reclaimer range. The elevated pressure allows a smaller bore for the same force output — reducing cylinder weight on the boom structure where every kilogram adds to the cantilever bending moment.
- Variable stroke (1,000–4,500 mm) — matched to the boom length and pitching angle range of each stacker reclaimer model. Longer booms require longer strokes for the same angular range.
- ️ Dust and weather sealing — stacker reclaimers operate outdoors in coal dust, iron ore fines, rain, and extreme temperatures. The cylinder uses heavy-duty wiper seals, dust boots, and corrosion-resistant rod coating to survive in this abrasive environment.
- ⚙️ Load-holding valves — prevent boom drop under hydraulic failure. The loaded cantilever boom can weigh 50–200 tonnes — an uncontrolled drop would cause catastrophic structural damage and endanger personnel. Contact the Korea Ever-Power hydraulic cylinder team for stacker reclaimer projects.
Skeleton Pitch Cylinder OEM & ODM
Provide the stacker reclaimer model, boom length and weight, pitching angle range, material type (coal, ore, aggregate), system pressure, and environmental conditions (temperature range, dust level). Korea Ever-Power delivers individually or as part of the complete stacker reclaimer cylinder set (skeleton pitch + chaser pitch + belt tensioning).
Frequently Asked Questions
What Our Customers Say
"The skeleton pitch cylinders on our coal stockyard stacker reclaimer have been running for 14 months in a very dusty environment. The heavy-duty wiper seals are keeping the rod clean — our previous cylinders needed seal replacement every 6 months, but these are still leak-free."
Eng. V. Petrov — Maintenance Director, Russian coal-fired power plant
"We ordered the complete 3-cylinder set (skeleton pitch + chaser pitch + belt tensioning) for a new iron ore stacker reclaimer. Korea Ever-Power delivered all cylinders with matched documentation. The installation went smoothly."
L. Andrade — Project Engineer, Brazilian mining company
"Good quality pitch cylinders. The 35 MPa rating provides margin above our 28 MPa system pressure. One note: the overall cylinder weight (420 kg each) requires a crane for installation on the boom structure — plan accordingly."
A. Kumar — Plant Engineer, Indian steel mill
"Replacement skeleton pitch cylinders for a 20-year-old stacker reclaimer. Korea Ever-Power matched the original mounting dimensions and upgraded the seals for better dust resistance. The boom positioning is noticeably more precise than with the worn originals."
M. Hoffman — Stockyard Superintendent, Australian mining port
"Emergency replacement — our starboard pitch cylinder developed a rod seal leak during peak coal delivery season. Korea Ever-Power shipped a replacement in 5 weeks. The stacker was back to full operation before we exceeded our stockpile reserve."
J. Nowak — Operations Manager, Polish power plant
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