Mixer Drum Drive Gearboxis a core transmission component in concrete mixing equipment, primarily used to transfer power from the drive source (such as an electric motor or engine) to the mixer drum, ensuring uniform mixing of materials.
I. Core Functions
1. Power Transmission
Converts rotational power from the motor or engine into the torque and speed required by the mixer drum, ensuring stable and efficient mixing operations.
2. Speed and Torque Adjustment
Adjusts output speed and torque based on material type (e.g., concrete, mortar) and process requirements, preventing overload or inadequate mixing.
3. Direction Control
Some gearboxes support forward/reverse rotation switching to meet varying needs during different mixing stages (e.g., rapid mixing vs. discharge).
II. Structural Components
1. Gear Set
• Drive Gear: Connects to the input shaft and receives power from the drive source.
• Driven Gear: Engages with the drive gear to transfer power to the mixer drum.
• Planetary Gear System(some models): Enables high torque output and compact structural design.
2. Transmission Shafts
• Input Shaft: Connects to the motor or engine.
• Output Shaft: Directly drives the mixer drum rotation.
3. Housing and Sealing
• High-Strength Cast Iron/Aluminum Alloy Housing: Protects internal gears and withstands impact loads during mixing.
• Dynamic Seals: Prevent lubricant leakage and ingress of external contaminants.
4. Lubrication System
• Forced Lubrication: Uses an oil pump to circulate lubricant, reducing gear wear.
• Splash Lubrication: Relies on gear rotation to splash lubricant, suitable for low-speed, heavy-duty applications.
III. Technical Features
1. High Transmission Efficiency
Gear meshing accuracy reaches ISO Class 6 or higher, with transmission efficiency ≥95%, minimizing energy loss.
2. Heavy-Duty Design
Large gear modules (e.g., module 8-12) and hardened tooth surfaces (HRC 58-62) withstand frequent starts/stops and impact loads.
3. Modular Structure
Supports rapid replacement of gear sets or shaft assemblies to adapt to mixer drums of different sizes (e.g., diameters 1.2m–3m).
4. Temperature Control Protection
Integrated temperature sensors trigger alarms when lubricant temperature exceeds 80°C, preventing gear overheating failure.
IV. Application Scenarios
1. Concrete Batching Plants
Drives twin-shaft mixer drums, achieving production capacities of 60–180m³/hour.
2. Mobile Mixing Trucks
Integrated with truck chassis, powered by hydraulic motors or electric motors to meet on-site construction demands.
3. Specialty Material Mixing
Adapts to high-viscosity materials (e.g., asphalt) or corrosive media (e.g., chemical slurries) in specialized mixing equipment.
V. Selection Criteria
1. Power Matching
Select gearbox rated power based on mixer drum capacity, e.g.:
• 2m³ mixer drum requires a 37kW gearbox.
• 4m³ mixer drum requires a 75kW gearbox.
2. Speed Range
Prioritize variable-speed models (e.g., 5–25rpm) to accommodate different material mixing processes.
3. Protection Level
For outdoor use, select IP65-rated models to resist rain and dust ingress.
4. Maintainability
Prefer models with inspection windows and oil-level viewports to shorten maintenance time.
VI. Typical Product Examples
• ZL-2810 Gearbox
• Application: Twin-shaft concrete mixers
• Specifications: Rated power 110kW, output speed 18–22rpm, gear accuracy ISO Class 7
• Advantage: Integrated forced lubrication system, continuous operation lifespan ≥20,000 hours
• Sicoma Planetary Gearbox
• Application: High-viscosity material mixing
• Specifications: Torque capacity 50,000N·m, supports forward/reverse rotation
• Advantage: Planetary gear structure reduces volume by 30% compared to traditional models
