ZYTJX250 Series Hydraulic Rail Clamp

The ZYTJX250 series hydraulic rail clamp is a normally - closed, spring - actuated, hydraulic - released rail - clamping device, designed for outdoor rail - mounted cranes and port machinery to provide reliable wind - proof and anti - slip braking during operation and parking, featuring a floating connection structure, double - guide - wheel anti - derailment design, and safety interlock protection. Below is a detailed breakdown of its core parameters, structural features, working principles, applications, common faults, and maintenance guidelines.

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Core Technical Parameters

Parameter	ZYTJX250 Standard Value
Rated anti - slip force	250 kN
Applicable rail models	P38, P43, P50, QU70, QU80, QU100, QU120
Working pressure	16 MPa (hydraulic release)
Hydraulic station power	0.75-1.5 kW (3 - phase AC380V 50Hz)
Control voltage	AC220V 50Hz or 3 - phase AC380V 50Hz
Clamping force source	Disc springs (fail - safe normally - closed)
Guide wheel protection	Double - guide - wheel anti - derailment
Limit switch	IP65, for interlock with traveling mechanism
Working environment	-20℃ to +50℃, salt - fog - resistant
Mounting method	Horizontal end - face flange
Weight	~280-300 kg
Compliance standard	JB/T 10917-2008

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Key Structural & Design Features

Fail - Safe Normally - Closed Design

Disc springs provide the main clamping force; the clamp is released by hydraulic pressure. In case of power/hydraulic failure, the disc springs instantly clamp the rail to prevent wind - induced movement.

The floating connection between the clamp base and the support accommodates rail deviation (±5 mm) during crane travel, ensuring stable clamping.

Anti - Derailment & Interlock Safety

Double guide wheels prevent the clamp from 脱离 the rail during clamping/release, improving operational stability.

An IP65 - rated limit switch confirms the release position and interlocks with the crane traveling mechanism, allowing the crane to move only when fully released.

Hydraulic Release & Manual Backup

Hydraulic cylinders drive the release, with low noise and stable action. The hydraulic station is equipped with a manual pump for emergency release during power failure, facilitating maintenance.

Corrosion - Resistant & Durable

The clamp body and fasteners are treated with anti - corrosion coating; the friction lining is salt - fog - and wear - resistant, suitable for coastal port and outdoor harsh environments.

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Working Principle

It operates in the disc - spring clamping + hydraulic release + interlock protection mode:

Clamping State (Power - Off/Wind - Proof): When the crane stops or loses power/hydraulic pressure, disc springs push the clamp jaws to clamp the rail, generating a 250 kN anti - slip force to prevent wind - induced displacement.

Release State (Operation): When the crane is ready to move, the hydraulic station starts, and hydraulic oil pushes the piston to compress the disc springs, separating the jaws from the rail. The limit switch sends a release - in - place signal, and the traveling mechanism can start.

Emergency & Manual Release: In case of power/hydraulic failure, the disc springs clamp the rail automatically. The manual pump on the hydraulic station can be used to release the clamp for maintenance.

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Typical Applications

It is mainly installed on the traveling mechanisms of outdoor rail - mounted cranes, such as gantry cranes, quayside container cranes, ship - to - shore cranes, and belt conveyor unloading carts, providing wind - proof braking during operation and auxiliary anti - slip protection during long - term parking. It is suitable for cranes with a rated load of 100-300 t and is often used in combination with wind - resistant cables and anchoring devices for double safety.

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Common Faults & Solutions Table

Fault Phenomenon	Possible Causes	Step - by - Step Solutions	Preventive Measures
Failure to release (crane cannot travel)	1. Insufficient hydraulic pressure; 2. Disc spring stuck/fatigued; 3. Limit switch misalignment; 4. Hydraulic oil leakage	1. Check the hydraulic station pressure and replenish oil; 2. Clean the spring chamber and replace fatigued springs; 3. Re - align the limit switch; 4. Inspect seals and replace worn ones	- Test hydraulic pressure monthly; - Replace hydraulic oil every 6 months
Weak clamping force (rail slips under wind load)	1. Worn friction lining (≤3 mm); 2. Uneven jaw clearance; 3. Fatigued disc springs; 4. Contaminated lining (oil/dust)	1. Replace the lining; 2. Adjust the clearance to 0.5-1 mm; 3. Replace the disc spring set; 4. Clean the lining and rail surface with degreaser	- Check lining thickness monthly; - Avoid oil leakage onto the friction surface
Hydraulic station overheating	1. Long - term high - pressure operation; 2. Clogged oil filter; 3. Hydraulic oil viscosity mismatch	1. Optimize the control logic to reduce idle pressure time; 2. Clean/replace the oil filter; 3. Use ISO VG46 hydraulic oil (suitable for -20℃ to +50℃)	- Clean the oil filter quarterly; - Monitor oil temperature (≤60℃)
Limit switch failure (no interlock signal)	1. Contact corrosion; 2. Damaged wiring; 3. Misaligned actuator	1. Clean contacts and apply anti - corrosion grease; 2. Replace damaged wires; 3. Re - align the actuator to ensure reliable triggering	- Clean the switch monthly; - Use shielded cables outdoors
Abnormal noise during clamping/release	1. Loose mounting bolts; 2. Guide wheel wear; 3. Jaw deformation	1. Tighten M20 bolts to 120-150 N·m; 2. Replace worn guide wheels; 3. Reface the jaw if deformation exceeds 0.2 mm	- Tighten bolts quarterly; - Check guide wheel wear monthly
Manual release failure	1. Manual pump failure; 2. Hydraulic circuit blockage; 3. Connecting rod jamming	1. Inspect the manual pump and replace the seal; 2. Clean the hydraulic circuit and remove blockages; 3. Lubricate the connecting rod pivot	- Test manual release after each maintenance

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Maintenance Guidelines

Daily Inspection (5-10 Minutes/Shift): Check the clamp for oil leakage, the limit switch signal, and the guide wheel condition.

Monthly Maintenance: Measure the friction lining thickness; adjust the jaw clearance; test the interlock function and hydraulic pressure.

Quarterly Maintenance: Clean the oil filter; lubricate the guide wheels and connecting rod pins; inspect the disc spring for fatigue.

Annual Maintenance: Replace the hydraulic oil and seals; conduct a 1.2 - times rated anti - slip force test; inspect the clamp body for corrosion.

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Summary

The ZYTJX250 series is a high - reliability hydraulic rail clamp with a fail - safe normally - closed design, double - guide - wheel anti - derailment protection, and low - maintenance hydraulic drive, making it an ideal wind - proof solution for large outdoor rail - mounted cranes, especially in coastal and high - wind areas.

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