ZWZB‑800/800 is a normally‑closed, DC‑powered heavy‑duty electromagnetic drum brake designed for high‑torque braking in DC‑powered industrial machinery. It belongs to the ZWZB series, replacing legacy ZWZ3/ZWZ3A models.
Basic Identification
Model: ZWZB‑800/800
Type: DC electromagnetic drum brake (ZWZB series)
Brake drum diameter: 800 mm
Rated braking torque: 8000 Nm (800/800 designation)
Power supply: DC 110 V / 220 V / 440 V
Compliance: GB 6334‑86 (mounting dimensions) & JB/T 7685‑2006 (technical specs)
Certifications: ISO 9001, ISO 14001, OHSAS 18001, EX/MA (explosion‑proof/mining)
Working Principle (Fail‑Safe Normally‑Closed)
Braking (power off): Heavy‑duty compression springs clamp brake shoes tightly onto the drum, providing constant holding torque.
Release (power on): DC electromagnet energizes, generating magnetic force to overcome spring tension, retracting shoes via lever linkage.
Wear compensation: Equipped with armature follow‑up device to maintain consistent air‑gap and braking performance as linings wear.
Key Technical Parameters
表格
| Parameter | Value |
|---|---|
| Rated braking torque | 8000 Nm |
| Brake drum diameter | 800 mm |
| Operating voltage | DC 110 V / 220 V / 440 V |
| Max. operating frequency | ≤ 720 cycles/hour (S3‑60%) |
| Duty cycle | S1‑100% (continuous) / S3‑25%/40%/60% (intermittent) |
| Ambient temperature | −5 °C to +40 °C |
| Relative humidity | ≤ 90% |
| Altitude | ≤ 2000 m |
| Total weight | ~450–500 kg (est.) |
Core Features
DC‑only design: Optimized for DC grids/electromagnetic cranes; not recommended for AC systems.
Fail‑safe safety: Automatically engages on power loss, critical for heavy lifting.
High torque & durability: 8000 Nm for heavy‑duty applications; asbestos‑free linings.
Armature follow‑up: Ensures consistent magnetic gap and reliable release.
Self‑lubricating pivots: Minimal maintenance, long service life.
Corrosion‑resistant: Robust construction for harsh industrial environments.
Applications
Primarily for deceleration, stopping, and static holding in:
Electromagnetic cranes & DC‑powered hoists
Port DC machinery (ship loaders/unloaders)
Metallurgical rolling mills & DC conveyors
Mining hoists & DC‑driven equipment
Heavy DC industrial machinery
