1 · Product Overview
The ZYTJX-250 Series is a normally closed, spring-applied, hydraulically released rail clamp. "ZYTJX" = (驻车/制动) hydraulic rail (轨) clamp (夹); "250" = size 250 (Ø250-class clamping mechanism, 60–120 kN per unit). It is a safety-parking device, not a service brake - it holds a parked machine to the rail; it does not decelerate a moving load.
It is the hydraulic, rail-biting evolution of two older ideas:
vs YFX storm wedge (iron wedge under the wheel): YFX wedges between wheel and rail, resists wind only, and wears the rail/wheel on long parking. ZYTJX bites the rail head directly with adjustable force, resists wind + grade, and can hold indefinitely.
vs YLZ40 hydraulic service brake: YLZ40 clamps a wheel/drum to stop motion (service braking). ZYTJX clamps the rail to prevent parked motion (safety parking). They are complementary, never substitutes.
Typical Applications:
Gantry / portal cranes, shipyard gantry, RTG / RMG - storm & parking anchor on both legs
Slope-track equipment & inclined mine haulage - anti-runback on grade
Outdoor rail-mounted stacker-reclaimers, ship unloaders, transfer cars - wind + startup-impact hold
Trestle / open-pit haulage, ladle-car & coke-oven pusher cars - long-term parked holding
Any rail-mounted asset where code requires a non-friction, mechanically locked parking device
2 · Technical Specifications
| Parameter | ZYTJX-250 Value |
|---|---|
| Model | ZYTJX-250 Series (hydraulic rail clamp) |
| Device type | Rail clamp / parking & storm-anchor (NOT a service brake) * |
| Clamping force | 60–120 kN per unit (config-dependent, confirm per order) * |
| Clamping surface | Rail head (both sides / top), QU70–QU120 / 50–60 kg/m |
| Actuation | Spring-applied (disc spring), hydraulically released |
| Release pressure | 10–16 MPa (central hydraulic station or local cylinder) |
| Required hydraulic flow | ~3–6 L/min per clamp (release only, intermittent) |
| Fail-safe | Pressure loss / power loss / E-stop → jaws lock (NC) |
| Jaw material | 42CrMo hardened, HRC 50–55, replaceable inserts |
| Jaw opening / stroke | ~30–45 mm (clear rail head + clearance) |
| Holding duration | Indefinite (spring only, no energy consumed) |
| Feedback | Jaw-open / jaw-clamped limit switches (PLC-ready) |
| Manual release | Hand pump / mechanical lever (maintenance towing) |
| Ambient temp. | -20°C to +50°C (std); -40°C low-temp seals |
| Protection | Jaw housing painted; cylinder IP65; Ex option on request |
| Standard | Design to customer rail / mounting drawing; anti-slip calc supplied |
| Options | Pressure switch, position transmitter, Ex version, corrosion paint, heated |
