YWZ8-200/E23 Drum Brake

 

 

 

1. Model Interpretation & Core Function

The YWZ8-200/E23's model code directly reflects its design generation, structural parameters, and matched components, enabling quick equipment pairing:

Model Segment	Meaning
YWZ8	8th-Generation Drum Brake (upgraded for heat dissipation and rigidity)
200	Brake drum diameter: 200 mm (medium-sized drum for medium-duty loads)
E23	Matched electro-hydraulic thruster model (E-series, 23 denotes 230 N thrust/power parameters)

Its core functions target safety and efficiency for medium-duty machinery, addressing higher performance demands than earlier series:

High-Frequency Braking: Smoothly decelerating or stopping machinery during frequent start-stop cycles (e.g., logistics conveyors, intermittent winches), with no thermal fading.

Emergency Stopping: Rapidly engaging in power loss, thruster failure, or overspeed (≥110% of rated speed) to prevent machinery runaway and avoid material spillage or equipment damage.

Static Load Holding: Securing medium loads (e.g., 5–15 ton lifted goods, conveyor materials) during downtime, maintenance, or power outages-ensuring zero accidental movement.

2. Working Principle

The YWZ8-200/E23 operates on a fail-safe principle (spring force for braking, electro-hydraulic thrust for release), with upgraded heat management to handle high-frequency use. Its working cycle includes three key states:

2.1 Brake Engagement (Safety State)

When the machinery is stationary, in emergency, or powered off, internal high-tension compression springs (60Si2MnA alloy steel) expand outward.

The springs push two arc-shaped brake shoes to swing outward, pressing the high-temperature-resistant friction pads tightly against the inner wall of the rotating brake drum.

Friction between the pads and drum generates stable braking torque (250–400 N·m), which resists the drum's rotation-either stopping the connected shaft or holding it stationary.

2.2 Brake Release (Operating State)

When the machinery needs to run, the matched E23 electro-hydraulic thruster is activated. The thruster converts electrical energy into linear hydraulic thrust (230 N).

This thrust pulls the integrated lever mechanism, compressing the internal springs and retracting the brake shoes inward. A precise 0.4–0.7 mm clearance is created between the pads and drum-avoiding drag friction and energy loss.

The brake drum rotates freely with the machinery shaft, enabling normal operation (e.g., conveyor movement, winch lifting).

2.3 Emergency Response (Fault State)

In case of power loss, thruster oil leakage, or emergency shutdown, the thruster's thrust dissipates instantly.

The compressed springs rebound within ≤0.35 seconds, driving the brake shoes to re-clamp the drum-engaging the brake rapidly to stop the machinery and eliminate safety hazards.

3. Core Structure & Key Components

The YWZ8-200/E23 features an upgraded modular design with four critical subsystems, focusing on heat dissipation, durability, and maintainability:

3.1 Brake Drum & Shoe Assembly (Friction Core)

Brake Drum: 200 mm diameter, made of HT300 gray cast iron (higher strength than HT250) with a quenched inner surface (hardness HB 220–260). It has integrated radial heat dissipation fins (8–12 fins) to accelerate heat release during high-frequency braking, avoiding thermal deformation. The drum is mounted on the machinery shaft via a taper lock or keyway for secure connection.

Brake Shoes: Two arc-shaped steel shoes (material: Q355) with thickened ribs (10 mm) to resist deformation under high spring force. Each shoe is lined with a ceramic-resin composite friction pad (thickness: 15 mm) with low wear rate and high-temperature resistance (up to 350°C).

Shoe Hinge: A cast steel hinge with self-lubricating brass bushings, ensuring smooth swinging of the shoes and reducing friction-induced wear-extending service life by 30% compared to YWZ4 series.

3.2 Actuation & Spring Mechanism (Power Core)

Matched E23 Electro-Hydraulic Thruster: Provides 230 N linear thrust to release the brake. It integrates a three-phase AC motor (380V/50Hz, power: 0.18 kW), a high-efficiency centrifugal pump, and a sealed cylinder with FKM seals (resisting oil aging). The thruster has a compact design for easy integration with the brake body.

Compression Springs: Two high-strength 60Si2MnA alloy steel springs (diameter: 16 mm) arranged symmetrically to provide uniform clamping force (4.5–6.0 kN). A hexagonal adjustment nut on the spring seat allows fine-tuning of braking torque to match different load requirements.

Reinforced Lever Mechanism: Two steel levers (material: 45# steel, thickness: 8 mm) with welded reinforcing plates, ensuring no deformation under the thruster's thrust. The lever pivot uses a sealed ball bearing to reduce friction and improve release efficiency.

3.3 Safety & Control Components (Control Core)

Dual Limit Switches: Standard-equipped position sensors (one for "fully engaged," one for "fully released") with IP65 protection. They send digital signals to the machinery's PLC, enabling interlock control-ensuring the main machine can only start when the brake is released, and stops immediately if the brake fails to engage.

Pad Wear & Temperature Sensors: Optional inductive wear sensors (trigger alarms when pad thickness ≤3 mm) and temperature sensors (monitor drum temperature ≤300°C) to prevent overheating and unplanned downtime.

Manual Release Lever: A mechanical lever mounted on the thruster's cylinder for manual retraction during power loss-facilitating maintenance or emergency reset of the machinery.

3.4 Mounting & Protection Components (Durability Core)

Adjustable Mounting Base: A steel base (material: Q355) with elongated slots (length: 25 mm) for ±10 mm horizontal/vertical adjustment. This simplifies alignment with the brake drum during on-site installation, even with minor shaft position deviations.

Environmental Protection Cover: A sheet metal cover (thickness: 2 mm) with IP55 protection, shielding internal components from dust, water splashes, and industrial debris. For harsh environments, an optional stainless steel cover (304 material) is available.

Anti-Corrosion Coating: All external metal components are coated with two layers of epoxy resin (total thickness: 100–120 μm) to resist rust in humid environments (relative humidity ≤95%) and extend service life.

 

 

 

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