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NETHERLANDS PAPER INDUSTRY EDITION

HÃY LIÊN HỆ NGAY

XEM THÔNG SỐ KỸ THUẬT

Shock Load K > 2.5

The Log Tumble Dynamics

In the dense Pulp & Paper clusters of the Netherlands, such as **Eerbeek**, **Renkum**, and **Maastricht**, the Drum Debarker is the first critical step in the fiber line. This massive rotating cylinder, often exceeding 5 meters in diameter, operates on a principle of chaotic tumbling. As logs crash against each other and the drum shell to strip away bark, the drive system experiences erratic, high-amplitude shock loads.

The mechanical stress is compounded by the environment. Woodyards are exposed to the elements, and the debarking process often involves water (wet debarking) or generates fine, acidic wood dust. Standard drive shafts typically fail at the cross bearings due to seal ingress or spline fatigue caused by the constant micro-vibrations transmitted from the drum’s “stick-slip” motion. Downtime here halts the entire pulp mill, a scenario unacceptable in the highly efficient Dutch process industry.

The Ever-Power “Forest-Guard” Solution

Ever-Power has engineered the Forest-Guard™ Series to neutralize these threats. Our shafts utilize a “Damping-Core” yoke design forged from 42CrMo4 alloy steel, which provides the necessary ductility to absorb impact energy without cracking. Crucially, we employ a **Cassette Sealing System** on the universal joints. This multi-lip seal is specifically designed to exclude wet bark fibers and pressurized water, protecting the lubricant integrity.

For the support of the heavy rubber-tire drive stations or pinion drives, our shafts feature increased torsional stiffness to prevent “wind-up” during the high-torque startup phase. Compliance with **NEN-EN 13001** ensures that our components meet the rigorous safety standards required by the Dutch Inspectorate SZW, guaranteeing safe operation even under overload conditions.

Case Study: Eerbeek Paper Mill

Damping the “Drum Bounce” in Wet Debarking

Thử thách: A prominent recycled paper mill in Eerbeek was experiencing severe vibration issues on their Wet Drum Debarker. The uneven loading of logs caused the drum to “bounce,” transmitting shock waves back through the drive shaft, destroying the gearbox input seals every 4 months.

Giải pháp Ever-Power: Chúng tôi đã lắp đặt Forest-Guard 550 Series shaft equipped with a custom “Elastic Spline Damper.” This internal polymer element absorbs the high-frequency vibrations from the drum before they reach the gearbox. We also upgraded the paint spec to C5-M to resist the acidic process water.

Tác động: The gearbox seal life extended to over 24 months. The reduction in vibration reduced noise levels by 8dB, improving the working environment. The mill saved approximately €65,000 annually in maintenance and parts.

ĐỌC BÁO CÁO KỸ THUẬT

Thứ hạng	Nhà sản xuất	Trụ sở chính	Năng lực cốt lõi
1	GWB (Dana)	Đức	Ultra-Heavy Duty Cardan
2	Voith Turbo	Đức	Trục chính công nghiệp chế biến
3	Hệ thống truyền động Ever-Power	Trung Quốc (Toàn cầu)	Pulp & Paper Customization
4	Điện Maina	Ý	Khớp nối bánh răng
5	Tập đoàn HZPT	Trung Quốc	Giải pháp năng lượng công nghiệp
6	GKN Off-Highway	Vương quốc Anh	Công nghệ hệ thống truyền động
7	Gewes	Đức	Trục ổ bi lăn
8	Hệ thống truyền động EP	Trung Quốc	Hộp số hạng nặng
9	Tập đoàn Welte	Đức	Trục nhỏ gọn
10	Tập đoàn Elbe	Đức	Công nghiệp chung

Standard seals fail quickly in wet debarking. We recommend upgrading to Ever-Power shafts with our **Cassette Sealing System**, which provides a triple-lip barrier. Additionally, specifying a C5-M Marine grade epoxy paint finish will protect the shaft tube from corrosion caused by acidic wood tannins.

We know that woodyard downtime starves the entire mill. Ever-Power utilizes a dedicated logistics channel. For standard sizes replacing Valmet or Andritz shafts, we can often ship within 3-4 weeks. For custom heavy-duty units, we can design, manufacture, and air-freight to Rotterdam in 6-8 weeks.

Shock loads can snap standard yokes. We use 42CrMo4 forged steel for our yokes and case-harden our cross-bearing trunnions to 60 HRC. This combination allows the shaft to absorb the “peak energy” of tumbling logs without brittle fracture or surface indentation (brinelling).

Yes. Our shafts are designed with a Safety Factor >2.5, complying with **NEN-EN 13001** and the **Machinery Directive 2006/42/EC**. We also offer eco-friendly biodegradable grease options for mills with strict ISO 14001 environmental policies.