English
The SZ horizontal conical twin-screw gearbox is a specialized mechanical drive system engineered for conical twin-screw extruders. This gearbox efficiently reduces speed while boosting torque from the master motor, transmitting power to the long shaft of the distribution box. It drives the short shaft via a pair of slender conical screw gears with a 1:1 drive ratio. Both the long and short shafts rotate the screws at the same angle, enabling high-quality extrusion through opposite-direction, outward-turning motion.It typically consists of two main components: a reduction box (for speed reduction and torque amplification) and a distribution box (which splits the power to the two output shafts at a 1:1 ratio via helical gears, driving the screws in opposite directions).
| Item | Parameters |
| Power | 5.5-200 |
| Gear Speed | 8-35 |
| Maximum output torque (kN.m) | 42 |
High Torque and Load Capacity: The reduction gearbox delivers high torque, making it suitable for high-load applications like plastic extrusion and supporting the processing of materials such as PVC and PP.
High Precision and Durability:High-strength alloy steel gears are carburized, hardened, and precision-ground to Grade 6 precision (GB10095.1-2008). The tooth surface hardness reaches HRC54-62, ensuring wear resistance and long life.
Compact and Efficient Design:The vertical tapered structure integrates the reduction and distribution gearboxes, saving space. The 1:1 spiral bevel gear transmission delivers high efficiency.
Low Vibration and Low Noise:The spiral bevel gear design reduces backlash and axial force, resulting in smooth and quiet operation, making it suitable for precision extrusion.
Flexible Installation and Compatibility:Supports horizontal or vertical mounting, is compatible with a variety of motors, and can be customized (such as the SZ65 and SZ80) to meet diverse production needs.
Easy Maintenance and High Reliability: Equipped with a lubrication system and thrust bearings, it undergoes 100% factory self-inspection and comes with a standard 12-month warranty, ensuring easy maintenance and stable operation.
1. What is the SZ Conical Twin Screw Extruder Reducer used for?
The SZ series reducer is designed for conical twin-screw extruders, primarily for plastic extrusion applications like PVC, WPC, and other polymer processing. It reduces motor speed, amplifies torque, and evenly distributes power to two conical screws for efficient material extrusion.
2. What are the key components of the SZ Reducer?
Reduction Gearbox: Reduces input motor speed and increases torque.
Distribution Gearbox: Uses high-precision helical bevel gears (1:1 ratio) to drive twin output shafts aligned with the conical screws.
Materials: Gears and shafts are made of high-strength alloy steel (e.g., 20CrMnTi or 20CrMnMo), carburized, quenched, and ground to Class 6 precision (GB/T 10095.1-2008), with tooth hardness of HRC54–62.
Housing: High-strength cast iron or steel for durability.
Bearings: High-capacity thrust bearings to handle axial loads from screw backpressure.
3. What materials are used in the SZ Reducer?
Gears and Shafts: High-strength alloy steel, carburized, and precision-ground for durability and low noise.
Housing: Cast iron or welded steel for robustness.
Bearings and Seals: Domestic or imported (e.g., SKF, NSK) thrust bearings and oil seals for enhanced reliability.
4. How do I select the right SZ model for my extruder?
Screw diameter (e.g., SZ65 for 65/132 mm screws, SZ92 for 92/188 mm screws).
Required output torque and speed.
Motor power and RPM.
Material type (e.g., PVC, PE, or WPC) and production capacity. Consult the manufacturer’s catalog or provide these parameters for model recommendations. For example, SZ80 is suited for medium-to-large PVC pipe extrusion.
5. What is the warranty and expected service life?
Warranty: Typically 12–18 months under normal operating conditions.
Service Life: Up to 15–20 years with proper maintenance, due to high-quality materials and precision engineering.
6. What maintenance is required?
Inspection: Check oil levels, seals, and alignment every 3–6 months. Manufacturers perform 100% inspection before shipping.
Lubrication: Use high-quality gear oil (e.g., ISO VG 220 or 320); replace every 3–6 months based on operating hours.
Installation Tips: Ensure a flat, stable base and secure mounting. Use high-strength couplings for models above SZ65; V-belts are acceptable for smaller models.
Common Issues: Monitor for oil leaks, abnormal noise, or overheating. Avoid overloading to prevent bearing or gear wear.
