YJGQ Hydraulic Rail Clamp: Storm Protection for Bridge Cranes, Gantry Cranes & Rail-Mounted Equipment

The YJGQ hydraulic rail clamp is a critical safety device designed to secure rail-mounted industrial equipment against wind-induced movement and emergency situations. With clamping forces ranging from 160 KN to 600 KN, the YJGQ series provides reliable storm protection for bridge cranes, gantry cranes, stacker-reclaimers, and other rail-mounted machinery in ports, steel mills, power plants, and heavy industrial facilities.

Featuring spring-applied, hydraulic-release operation, the YJGQ rail clamp automatically engages when hydraulic pressure is lost—ensuring your equipment remains secure during power failures, hydraulic system breaches, or emergency situations when you need security most.

Key Specifications at a Glance

Why Choose YJGQ Hydraulic Rail Clamps?

1. Complete Storm Protection System

The YJGQ rail clamp is a cornerstone of comprehensive crane storm protection:

• Spring-applied fail-safe design engages automatically on pressure loss
• Multiple force ratings (160-600 KN) match different crane sizes
• Directly grips rail web for positive, slip-free anchoring

2. Flexible Force Options

The YJGQ series offers six force ratings to match your equipment:

• YJGQ-16: 160 KN - Light cranes, stacker-reclaimers
• YJGQ-20: 200 KN - Medium bridge cranes
• YJGQ-25: 250 KN - Heavy-duty gantry cranes
• YJGQ-31: 315 KN - Large gantry equipment
• YJGQ-40: 400 KN - Port gantry cranes
• YJGQ-60: 600 KN - Massive shipyard goliaths

3. Broad Rail Compatibility

YJGQ rail clamps accommodate standard industrial rail profiles:

• Qu100 (100 lb/yd rail)
• Qu80 (80 lb/yd rail)
• Qu70 (70 lb/yd rail)
• P50 (50 kg/m rail)
• Qu120 (120 lb/yd rail)

4. Anti-Slip Calculation

The anti-slip force is calculated using:

Fanti-slip = 2 × Clamping Force × μ

Where μ (friction coefficient) = 0.25 typically

Example: YJGQ-40 with 400 KN clamping force provides 200 KN anti-slip force

YJGQ Model Specifications

Note: All models require matching YZ(J) hydraulic station. See hydraulic station matching table below.

Hydraulic Station Matching

How YJGQ Rail Clamps Work

Storm Protection Mode (Clamped)

In the clamped position:

• Spring force pushes clamping jaws against the rail web
• Mechanical grip prevents any horizontal crane movement
• Wind forces cannot shift the secured crane
• System remains clamped even during complete power loss

Operational Mode (Released)

When the crane needs to move:

• Hydraulic pressure (10-16 MPa) is applied to the clamp cylinder
• Hydraulic force overcomes spring force
• Clamping jaws release from the rail
• Crane can travel freely

Primary Applications

Bridge & Gantry Cranes

The primary application for YJGQ rail clamps is bridge cranes and gantry cranes in industrial facilities, warehouses, and manufacturing plants. The clamp provides critical storm protection for these expensive pieces of equipment.

Port Terminal Equipment

In port terminals, YJGQ clamps secure rubber-tyred gantry (RTG) cranes, mobile harbor cranes, and shipyard equipment against typhoons and high winds.

Stacker-Reclaimers

Stacker-reclaimer machines in coal yards, ore stockpiles, and bulk terminals use YJGQ rail clamps to prevent wind-induced movement that could damage conveyor systems or the machines themselves.

Steel Mills & Heavy Industry

In steel mills and heavy industrial facilities, YJGQ clamps secure equipment during maintenance operations and provide emergency stopping capability.

YJGQ vs YDGZ-40: Choosing the Right Rail Clamp

Choose YJGQ when: You need flexibility with multiple force ratings to match different crane sizes, or when lighter weight and lower hydraulic pressure requirements simplify your system.

Choose YDGZ-40 when: You need maximum clamping force (400 KN fixed) for the largest port cranes and ship-to-shore equipment, or when the heavier, more robust construction is needed for extreme conditions.

Frequently Asked Questions

How do I select the right YJGQ model for my crane?

Select based on your crane’s wheel load and rail size. YJGQ-16 (160 KN) suits light cranes up to 10 tons, YJGQ-20 (200 KN) for medium cranes up to 20 tons, YJGQ-25/31 (250-315 KN) for heavy cranes up to 50 tons, and YJGQ-40/60 (400-600 KN) for port gantry cranes and heavy Goliath equipment. Always verify with your crane manufacturer and consider local wind load requirements.

What happens if hydraulic pressure is lost during a storm?

This is the key safety feature of YJGQ rail clamps. The spring-applied design means ANY loss of hydraulic pressure—including hose rupture, pump failure, or power loss—causes the clamp to automatically ENGAGE. Your crane becomes MORE secure during the emergency, not less. This fail-safe behavior meets crane safety standards worldwide.

What hydraulic station do I need for YJGQ clamps?

Each YJGQ model requires a matching YZ(J) hydraulic station: YJGQ-16 needs YZ(J)-13-4, YJGQ-20 needs YZ(J)-10-6, YJGQ-25/31 need YZ(J)-13-6 or YZ(J)-14-9, and YJGQ-40/60 need YZ(J)-14-9 or YZ(J)-15-10. The hydraulic station provides the hydraulic power and control for the clamp operation.

Can YJGQ clamps be retrofitted to older cranes?

Yes, YJGQ clamps can typically be retrofitted to existing cranes with minimal modifications. Our engineering team can provide retrofit guidance including mounting adapter designs, hydraulic piping layouts, and electrical integration. Many older port cranes and industrial cranes have been successfully upgraded with YJGQ rail clamps.

What maintenance does YJGQ require?

YJGQ clamps require minimal maintenance: (1) Monthly visual inspection for leaks and secure mounting, (2) Quarterly verification of limit switch operation, (3) Annual inspection of friction surfaces for wear, (4) Periodic hydraulic system maintenance per the hydraulic station manufacturer’s recommendations. The manual release mechanism should be tested quarterly.

Related Products & Storm Protection System

Complete your crane storm protection system with these complementary products:

• YDGZ-40 Heavy Duty Hydraulic Rail Clamp - Maximum force option (400 KN) for largest cranes
• YLBZ Series Hydraulic Wheel Side Brake - Wheel tread braking for drive wheel arrestment
• YFX Electric Hydraulic Windproof Iron Wedge Brake - Wedge-type wheel brake for additional arrestment
• YWZ4 Series Electric Hydraulic Drum Brakes - Hoist and travel brakes for crane applications

Request a Quote for YJGQ Hydraulic Rail Clamps

Get the storm protection your rail-mounted equipment demands. Our engineering team can help you select the optimal YJGQ model based on your crane specifications, rail profile, and local wind load requirements.

Contact us today to discuss your storm protection requirements, request dimensional drawings, or receive a detailed quotation for YJGQ hydraulic rail clamps and complete brake systems.