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YJGQ-20 Series Hydraulic Rail Clamp
🏗️ What is the YJGQ-20? The YJGQ-20 is a Hydraulic Rail Clamp (also known as a Rail Lock or Track Clamp ). Unlike brakes that act on wheels or discs (like the MW, DCPZ, or YLZ series), this device physically grips the rail head to prevent the crane from moving. Operation Principle: It is a...
Description
🏗️ What is the YJGQ-20?
The YJGQ-20 is a Hydraulic Rail Clamp (also known as a Rail Lock or Track Clamp). Unlike brakes that act on wheels or discs (like the MW, DCPZ, or YLZ series), this device physically grips the rail head to prevent the crane from moving.
Operation Principle: It is a Fail-Safe (Spring Applied) device. Powerful springs force the clamp jaws onto the rail. Hydraulic pressure is used to open (release) the jaws when the crane needs to move.
Model Meaning:
Y: Hydraulic (Ye)
J: Clamp / Grip (Jia)
G: Rail (Gui)
Q: Hydraulic Pusher (Qian)
20: Indicates the specific frame size or nominal clamping force (approx. 20 kN or related metric tonnage).
📋 Key Specifications
| Parameter | Specification | Notes |
|---|---|---|
| Model | YJGQ-20 | Part of the YJGQ Hydraulic Rail Clamp series. |
| Actuation | Hydraulic Release | Requires hydraulic pressure to open. |
| Failure Mode | Fail-Safe (Spring Applied) | Automatically clamps the rail if power/hydraulics fail. |
| Applicable Rail | P43, P50, P60, P75 | Fits standard crane rail profiles. |
| Protection Level | IP65 | Dust-tight and protected against water jets (suitable for outdoor use). |
✨ Key Features
Based on the technical data for similar hydraulic clamps, here are the core characteristics:
Direct Rail Clamping:
The device has jaws that close directly onto the head of the rail. This provides a very secure hold, preventing the crane from sliding sideways during storms.
High Reliability:
The hydraulic system ensures smooth and rapid engagement/disengagement. The spring mechanism is designed to provide consistent clamping force even after years of use.
Status Monitoring (Limit Switches):
It is equipped with limit switches to provide feedback to the crane's control system. This confirms whether the clamp is fully released (allowing movement) or fully applied (secured). This creates a safety interlock to prevent collisions.
Manual Release Function:
For maintenance or emergency situations (e.g., power failure), the clamp can be manually released using a lever or screw mechanism.
Corrosion Resistance:
Since these are used outdoors in ports and shipyards, the components are often treated or made from materials resistant to salt spray and rain.
🏭 Typical Applications
The YJGQ-20 is exclusively used on large outdoor rail-mounted cranes, including:
Gantry Cranes (龙门起重机)
Container Cranes (岸桥)
Ship-to-Shore Cranes
Large Jib Cranes
💡 Comparison to Similar Models
vs. YLZ (Wheel Clamp): The YLZ clamps the wheel flange, while the YJGQ clamps the rail head. Rail clamps are often used as the primary anti-wind device.
vs. YFX (Wedge): The YFX is a wedge that jams under the rail, while the YJGQ is a hydraulic jaw that grips the top/sides of the rail. Hydraulic clamps generally offer faster operation and easier automation.
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