YWZ9-A Series Drum Brake - YWZ9-200/E23A

 

 

The YWZ9-200/E23A is a high-reliability medium-duty industrial drum brake belonging to the upgraded YWZ9-A series, engineered for precise deceleration, heavy load-holding, and emergency safety control of small-to-medium rotating machinery. Classified as a fail-safe, spring-engaged, electro-hydraulic released brake, it integrates the YWZ9 series' core strengths (enhanced structural stability, efficient force transmission) with "A-type" optimizations (improved corrosion resistance, intelligent monitoring compatibility, and modular maintenance). The model designation (YWZ9-200/E23A) clarifies its key parameters: "YWZ9-A" for the upgraded 9th-generation drum brake series, "200" for the brake drum diameter (200 mm), and "E23A" for the matched dedicated electro-hydraulic thruster (E23 variant optimized for YWZ9-A's interface and performance requirements). Widely used in heavy industry, logistics, mining, and port machinery, it ensures safe operation under loads of 200–650 tons and harsh working conditions (high frequency, heavy dust, humidity, and temperature fluctuations). Below is a detailed breakdown of its core attributes, working principle, key features, typical applications, and technical specifications:

1. Model Interpretation & Core Function

The YWZ9-200/E23A's model code reflects its design upgrades, matching components, and performance scope for quick equipment pairing:

Model Segment	Meaning
YWZ9-A	Upgraded 9th-Generation Drum Brake Series ("A" = enhanced corrosion resistance, intelligent control compatibility, modular design)
200	Brake drum diameter: 200 mm (medium-sized drum for medium-duty loads)
E23A	Matched dedicated electro-hydraulic thruster: E23 variant ("A" = optimized for YWZ9-A's lever ratio, mounting interface, and thrust output)

Its core functions target high-demand industrial scenarios requiring safety, durability, and adaptability:

High-Frequency & Heavy-Duty Braking: Smoothly decelerates or stops machinery during frequent start-stop cycles (e.g., port conveyors, mining winches) without thermal fading or structural deformation.

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

Static Load Holding: Secures medium-to-heavy loads (e.g., 5–18 ton lifted goods, bulk materials) during downtime, maintenance, or power outages-ensuring zero accidental movement.

Intelligent Safety Control: Compatible with industrial control systems (PLC, SCADA) via built-in sensors, enabling real-time status monitoring and remote fault diagnosis.

2. Working Principle

The YWZ9-200/E23A operates on a fail-safe principle (spring force for braking, electro-hydraulic thrust for release), inheriting the YWZ9 series' efficient force transmission while optimizing response speed and stability for A-type upgrades. Its working cycle includes three key states:

2.1 Brake Engagement (Safety State)

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

The spring force pushes two arc-shaped brake shoes to swing outward, pressing high-performance ceramic-resin friction pads tightly against the inner wall of the rotating brake drum.

Friction between the pads and drum generates stable braking torque (300–450 N·m), resisting the drum's rotation to stop the connected machinery shaft or hold it stationary.

2.2 Brake Release (Operating State)

When the machinery needs to run, the matched E23A electro-hydraulic thruster is activated. The thruster converts electrical energy into linear hydraulic thrust (230 N) via its internal motor, centrifugal pump, and sealed cylinder.

This thrust pulls the integrated modular lever mechanism (A-type optimization), 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-minimizing 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 signals, the thruster's hydraulic thrust dissipates instantly.

The compressed springs rebound within ≤0.28 seconds, driving the brake shoes to re-clamp the drum-engaging the brake rapidly to stop the machinery and eliminate safety risks.

3. Core Structure & Key Components

The YWZ9-200/E23A features an upgraded modular design with four critical subsystems, focusing on structural rigidity, corrosion resistance, and intelligent compatibility (A-type core upgrades):

3.1 Brake Drum & Shoe Assembly (Friction Core)

Brake Drum: 200 mm diameter, made of HT350 gray cast iron (higher strength and heat conductivity than HT300) with a quenched and tempered inner surface (hardness HB 240–280). It integrates radial heat dissipation fins (10–14 fins) and a thickened wall (15 mm) to accelerate heat release during high-frequency braking, avoiding thermal deformation and fading. The drum is mounted on the machinery shaft via a taper lock or keyway for secure, concentric rotation.

Brake Shoes: Two arc-shaped steel shoes (material: Q355B) with reinforced ribs (10 mm thickness) and anti-deformation brackets. Each shoe is lined with a 16 mm thick ceramic-resin composite friction pad-featuring a stable friction coefficient, high-temperature resistance (up to 380°C), and low wear rate.

Shoe Hinge: A cast steel hinge with self-lubricating, corrosion-resistant brass bushings (A-type upgrade: PTFE coating on bushings) ensuring smooth swinging of the shoes and reducing friction-induced wear-extending service life by 35% compared to standard YWZ9 models.

3.2 Actuation & Spring Mechanism (Power Core)

Matched E23A Electro-Hydraulic Thruster: Dedicated for YWZ9-A series, providing 230 N linear thrust. It integrates a three-phase AC motor (380V/50Hz, power: 0.18 kW), high-efficiency centrifugal pump, and sealed cylinder with FKM (fluororubber) seals-resisting oil aging, corrosion, and high temperatures. The thruster's mounting interface and lever connection are optimized for YWZ9-A's structure, ensuring precise force transmission and zero alignment errors.

Compression Springs: Two high-strength 60Si2MnA alloy steel springs (diameter: 16 mm) arranged symmetrically to provide uniform clamping force (5.0–6.5 kN). A hexagonal adjustment nut on the spring seat allows fine-tuning of braking torque to match different load requirements (300–450 N·m).

Modular Lever Mechanism (A-type Upgrade): Two 45# steel levers (thickness: 8 mm) with welded reinforcing plates and detachable connection points. The lever pivot uses a sealed ball bearing (filled with corrosion-resistant grease) to reduce friction and improve release efficiency-enabling easy replacement of lever components without disassembling the entire brake.

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 (A-type upgrade: anti-corrosion, dust-tight housing). 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.

Integrated Sensors (Optional): Inductive wear sensors (trigger alarms when pad thickness ≤3 mm), temperature sensors (monitor drum temperature ≤350°C), and pressure sensors (detect thruster hydraulic pressure) for real-time status monitoring and predictive maintenance.

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, A-type Focus)

Adjustable Mounting Base: A Q355B steel base with elongated slots (length: 25 mm) for ±10 mm horizontal/vertical adjustment. The base is coated with double-layer epoxy resin (120–150 μm thickness) for enhanced corrosion resistance, suitable for humid or coastal environments.

Environmental Protection Cover: A 2 mm thick sheet metal cover with IP56 protection (A-type upgrade: higher dust/water resistance than standard IP55), shielding internal components from heavy dust, water splashes, and industrial debris. For extreme environments, an optional 304 stainless steel cover is available.

Anti-Corrosion Upgrades (A-type Core): All external metal components (levers, base, fasteners) are coated with two layers of epoxy resin; fasteners use hot-dip galvanized or 304 stainless steel (optional) to resist rust in humid, coastal, or dusty environments (relative humidity ≤95%).

 

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