The YFX-600/80-L is a heavy-duty fail-safe brake from the YFX series of electro-hydraulic wedge brakes. It adopts a normally closed design with spring-applied braking and electro-hydraulic release, featuring a unique wedge-type force amplification structure. With a brake drum diameter of 600 mm and a nominal braking torque of 80 kN·m, it is left-mounted (marked by "L") and tailored for ultra-heavy industrial machinery. Its working principle centers on reliable force transmission and fail-safe protection, with applications covering heavy-duty industrial sectors. Details are as follows:
1. Working Principle
The brake operates based on the core logic of "spring-driven braking + electro-hydraulic release," enhanced by a wedge mechanism for force amplification and rapid response. The working cycle includes three key states:
1.1 Brake Engagement (Default Safety State)
When the machinery is stationary, powered off, or in an emergency, the electro-hydraulic push rod is de-energized and has no hydraulic output.
Internal high-tension 60Si2MnA alloy steel disc springs release elastic force, pushing the forged 42CrMo alloy steel wedge mechanism. This drives two thickened Q690 high-strength steel brake shoes to expand outward.
The 25 mm thick ceramic-based composite friction linings on the shoes clamp tightly against the inner wall of the 600 mm HT400 high-strength brake drum. The generated 80 kN·m friction torque quickly absorbs the inertia of the rotating mechanism, stopping the equipment or firmly holding heavy loads to prevent accidental movement.
A built-in wedge self-locking mechanism ensures the brake remains stably engaged without additional energy input during static load holding.
1.2 Brake Release (Operating State)
When the machinery needs to run, the 380V AC electro-hydraulic push rod (3–5 kW power) is energized. Its internal hydraulic pump generates 10–16 MPa pressure to drive the piston rod forward.
The piston rod pushes the wedge to move horizontally, overcoming the disc spring force and pulling the brake shoes inward via the linkage mechanism. A precise 0.8–1.2 mm clearance is formed between the friction linings and the brake drum.
The brake drum rotates freely with the machinery shaft, allowing the equipment (such as heavy cranes or mine hoists) to operate normally without drag friction.
1.3 Emergency Response & Stability Guarantee
In case of power loss, hydraulic system leakage, or emergency shutdown signals, the electro-hydraulic push rod loses power instantly, and hydraulic pressure dissipates. The disc springs rebound within ≤0.3 seconds, driving the wedge and brake shoes to re-clamp the drum, achieving rapid emergency braking.
An automatic clearance adjuster compensates for up to 20 mm of friction lining wear, maintaining consistent braking performance and avoiding frequent manual adjustments. Self-lubricating spherical bearings at the linkage ensure smooth force transmission and synchronized shoe movement.
2. Typical Applications
The YFX-600/80-L is designed for 1000–3000 ton ultra-heavy industrial machinery, excelling in harsh environments with high dust, high temperature, and high-frequency start-stop cycles. Core applications include:
2.1 Heavy Hoisting Machinery
Compatible with large overhead cranes, gantry cranes, and electromagnetic hoists in steel mills, ports, and heavy machinery factories. It provides stable braking during the hoisting and transportation of ultra-heavy workpieces (such as steel billets, large equipment components), preventing load shaking or falling and ensuring operational safety.
Suitable for the main braking system of large electric winches, enabling precise load positioning and emergency stopping during lifting/lowering processes.
2.2 Metallurgical & Mining Machinery
Used in the main hoists, inclined shaft conveyors, and ore handling equipment of large mines. Its IP65 protection enclosure and anti-corrosion coating adapt to dusty and humid underground or open-pit mining environments, ensuring reliable braking for mineral transportation.
Applied to billet conveyors, ladle turntables, and rolling mill auxiliary drives in metallurgical plants. The high-temperature resistant (up to 600°C) friction linings withstand the high-temperature working environment near molten steel, ensuring stable braking of high-temperature materials.
2.3 Port & Shipping Equipment
Matches the gantry cranes, container stackers, and bulk cargo loaders/unloaders in large ports. It adapts to the high-frequency loading/unloading rhythm of ports, providing strong and stable braking force to ensure the safe handling of containers or bulk cargo (such as coal, grain).
Resists coastal humidity and salt spray corrosion via anti-corrosion coating, maintaining long-term reliable performance in marine environments.
2.4 Other Heavy-Duty Industrial Equipment
Suitable for the main braking system of large material belt conveyors in coal-fired power plants and cement factories, preventing material backflow or scattering on inclined conveyors.
Applied to heavy-duty traction equipment in large construction projects (such as tunnel boring machines, bridge erection equipment), realizing stable deceleration and parking braking during equipment movement, ensuring construction safety.
