1. Installation Methods
ZWZ series heavy-duty DC electromagnetic drum brakes adopt vertical upward electromagnet mounting as standard layout, horizontal lateral installation is customizable for narrow vertical equipment space. Mounting dimensions comply with GB6334-86 and JB/ZQ4386 standards, realizing direct interchangeable replacement of old ZWZ, ZWZ3 and ZWZA models.
Standard Vertical Installation
Secure the cast integral brake base firmly to flat rigid support brackets with high-strength bolts. Ensure two brake shoes are symmetrically wrapped around the brake drum, and the central axis of brake frame is strictly coaxial with the drum to avoid eccentric friction, local overheating and uneven lining abrasion.
Mount the matched DC electromagnet vertically on the top of brake arm. Keep armature pull rod moving straight vertically without deflection, to deliver stable magnetic attraction force for power-on brake release.
Built-in patented interlinked equal-gap balancing device automatically maintains uniform clearance between friction linings and drum on both sides, eliminating unilateral shoe dragging and reducing frequent manual calibration work.
Reserve ample surrounding operation space for friction lining replacement, braking torque calibration, coil overhaul and manual emergency release.
Optional Horizontal Side Mounting
Suitable for crane trolley travel mechanisms and compact equipment with limited vertical height. Flip the brake arm assembly and arrange the brake laterally around the brake drum, which requires customized transition brackets. After horizontal assembly, inspect armature reset spring elasticity to prevent incomplete braking or delayed release action.
Core Installation Requirements
All hinge pivot joints are equipped with maintenance-free self-lubricating bearings; periodic greasing is not required after installation.
Fully remove oil stains, rust and dust on brake drum surface before commissioning; grease contamination will drastically lower friction coefficient and braking efficiency.
Adjust pre-compression of main braking spring via torque adjusting nuts to set required rated braking torque.
Fail-safe working logic: When energized, DC electromagnet generates magnetic pull to open brake shoes and release brake; power cut-off triggers main spring to clamp the drum for automatic safety braking.
Isolate electromagnetic coils from splashing water, heavy dust and corrosive gas to extend service life.
Standard power supply: DC110V / DC220V; applicable for DC-driven lifting, metallurgical and port machinery.
2. Standard Matching Accessories
Core Functional Supporting Components
DC Electromagnet AssemblyExclusive driving unit for ZWZ series, available in parallel coil and series-parallel dual-coil versions to match different duty cycles (25%–50% ED). Standard voltage DC110V/DC220V; integrated rectifier module optional for AC input conversion.
Manual Release LeverRealizes emergency brake opening during power outage or equipment static overhaul, convenient for inspection and maintenance without power supply.
Status Limit SwitchesDetect fully-braked and fully-released brake positions, transmit real-time feedback signals to PLC control system for safety interlock and fault alarm.
Consumable Spare Parts
Snap-on Quick-Replace Friction LiningsEco-friendly non-asbestos wear-resistant friction blocks with clamping plug-in structure; independent replacement without disassembling the whole brake frame. Semi-metallic linings are optional for heavy-load, high-frequency braking scenarios.
Complete Adjustment & Fastener KitContains torque adjusting nuts, clearance fine-tuning screws, lock bolts, hinge pins and auxiliary reset springs for long-term maintenance and parameter recalibration.
Spare DC Coils & Armature ComponentsFor replacement when coils burn out, age or armature gaps exceed standard tolerance.
3. Optional Custom Accessories
Flameproof electromagnetic assemblies and Ex-certified limit switches for coal mines, chemical plants and flammable & explosive hazardous zones.
Special transition brackets dedicated to horizontal side mounting layout.
Dust and rainproof protective covers for outdoor port, mining and cement plant high-dust operating sites.
Anti-corrosion surface coating and stainless steel fasteners for coastal humid, salt-fog corrosive environments.
Buffer damping assemblies to reduce impact, vibration and running noise under frequent start-stop cycles.
Dual-group windproof electromagnetic components for outdoor rail cranes to enhance parking anti-slip performance under strong wind conditions.
