Electric Hydraulic Arm Disc Brakes

YPZ2 Ⅰ, Ⅱ, Ⅲ Series Electro-hydraulic Arm Disc Brake

1. The YPZ2 I, II, and III series electro-hydraulic arm disc brake is a high-performance industrial braking device driven by an electro-hydraulic actuator. It is equipped with an automatic backlash equalization system and an automatic compensation device for liner wear, enabling deceleration, parking braking, and safety protection.
2. Brakes are primarily used in industries such as lifting and transportation, loading and unloading machinery, metallurgy, and mining. They are widely employed for deceleration and parking braking of heavy equipment like gantry cranes, container gantry cranes, rolling mills, and mine hoists. These brakes are essentially maintenance-free due to their automatic equalization of shoe clearance and compensation for pad wear. Additionally, they can offer interlock protection for PLC systems through the addition of limit switches, making them especially well-suited for modern, large-scale industrial equipment with high levels of automation and complex, heavy-duty operating conditions.
3. The key advantages of this brake system can be summarized in the following four points:

• Automatic equalization and compensation ensure consistent braking: Equipped with an interlocking equalization mechanism, the system maintains uniform shoe clearance on both sides, preventing the brake pads from floating against the brake disc. It also features an automatic wear compensation system that keeps the shoe clearance and braking torque constant throughout use, eliminating the need for frequent manual adjustments.
• Lubrication-free key components and low maintenance costs: Major swing hinge points are fitted with self-lubricating bearings, ensuring high transmission efficiency and a long service life. No grease is required during operation, making it virtually maintenance-free.
• Intuitive torque adjustment and easy pad replacement: The brake spring is housed inside a square spring tube and includes a torque scale, offering an intuitive display and easy adjustment of braking torque. The asbestos-free brake pads have a plug-in design, eliminating the need for complex disassembly during replacement, making it quick and efficient.
• Strong expandability and compatibility with intelligent control: The system can be equipped with a manual release device, various limit switches (such as gate opening/closing displays and liner wear limit alarms), and a time-delay valve. It can also provide interlock protection signals for the PLC system and enable additional functions, such as smooth braking or power-off maintenance.

Ambient Environment

• Temperature: -20°C to +50°C; avoid prolonged exposure to extreme temperatures.
• Relative Humidity: ≤90%; no condensation or corrosion when the monthly average temperature exceeds 25°C.
• Altitude: Maximum 1000m, in compliance with GB 755-2008.
• Cleanliness: No flammable, explosive, or corrosive gases, vapors, or dust; use explosion-proof or corrosion-resistant models in special environments.
• Vibration: No severe vibration or impact during operation.

Power Supply

• Rated Specifications: 3-phase AC, 380V/50Hz (customizable).
• Voltage Fluctuation: -15% to +10% of the rated value.
• Stability: No frequent surges or interruptions.

For example, if the brake disc diameter is 630 mm, the center height is 370 mm, and the brake is equipped with an automatic wear compensation device, an open-position indication travel switch, a manual release mechanism, a right-hand configuration, an Ed201/6 thruster, and a delay valve, the order code should be specified as YPZ₂-630Ⅲ/E201S-MK1S (Right).

Note: Specific models and structural dimensions are subject to modification without prior notice.

The YPZ2 Series I, II, and III electro-hydraulic arm disc brakes primarily consist of the following core components: a drive unit (Ed series electro-hydraulic actuator), an actuator (brake arms, tie rods, brake shoes, and asbestos-free brake pads), a braking force generation and adjustment mechanism (square Bourdon tube, brake spring, and torque scale), and key auxiliary mechanisms (interlocking equalization device, automatic wear compensation device, self-lubricating bearings, etc.).

The working principle is based on a normally closed design, where spring force is used for braking and electric drive is used for release:

Braking (Engagement) Process: When the system is de-energized, the actuator is also de-energized, causing its thrust to disappear. At this point, the pre-compressed brake spring releases its stored energy, driving the two brake arms inward via the tie rod and lever system. This causes the brake pads to press against the brake disc, generating the set braking torque and achieving safe braking.

Brake Release (Opening) Process: When the system is powered on, the actuator is energized. The piston inside quickly moves the push rod upwards under the pressure of hydraulic oil, generating enough force to further compress the brake spring. The crossbar then opens the two brake arms outward, completely disengaging the brake shoes from the brake disc, eliminating braking pressure and allowing the brake disc to rotate freely with the equipment.

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