Horizontal Single-Screw Extruder Gearbox

As a professional engineering-focused Chinese manufacturer and supplier of Horizontal Single-Screw Extruder Gearbox, HAPPY PLASTICS provides reliable transmission supporting solutions to guarantee stable continuous production. Each set of gearbox integrates ultra-high structural rigidity and precise speed ratio matching. Different from ordinary low-torque gearboxes on the market, our heavy-duty gearbox is equipped with carburized high-strength gear trains and independent thrust bearing assemblies, perfectly matching production lines processing difficult materials such as PVC, wire & cable insulation materials and rubber blends.

Separate Load-Bearing Structure

Ordinary general gearboxes are only designed to transmit rotary torque, while the Horizontal Single-Screw Extruder Gearbox must bear continuous axial impact force fed back by the screw melt. Its internal structure realizes independent bearing of torque transmission and axial thrust:

[Motor Torque Input] ➔ [Parallel Helical Reducer Gear Set] ➔  [Melt Backpressure] ➔ [Integrated Combined Thrust Bearing Assembly] ➔ [Output Spline Shaft]

• Independent load separation design: The helical gear group of the gearbox only undertakes rotary torque transmission to avoid gear tooth offset and uneven meshing.

• Independent thrust bearing chamber: Heavy-duty combined self-aligning thrust roller bearings are installed at the output end, which can completely isolate 40–60 MPa melt backpressure at the source and prevent tiny deflection deformation from damaging gear teeth.

Material Standard

Long service life relies on professional heat treatment and high-precision tooth profile machining. All internal parts of the Horizontal Single-Screw Extruder Gearbox comply with strict material technical standards:

• Dual-performance gear material: Gear blanks are made of 20CrMnTi low-carbon alloy steel, treated by gas carburizing and oil quenching. The tooth surface forms an ultra-hard wear-resistant layer (≥60 HRC) to resist long-term meshing abrasion, while the gear core maintains high ductility to buffer instantaneous torque surges.

• Micro-precision tooth grinding finish: Finished by multi-axis CNC gear grinding machines to reach DIN 5 precision standard. Tiny surface pits and protrusions are eliminated to reduce transmission friction and suppress high-frequency gear howling noise.

• Anti-deflection integrated housing: Cast with thick-wall high-density HT250 cast iron and dense internal reinforcing ribs, which effectively restrains box torsion deformation under full maximum motor torque.

Active Circulation Heat Dissipation

Long-term high-torque operation generates massive heat, which will attenuate lubricating oil viscosity and accelerate part wear. Our Horizontal Single-Screw Extruder Gearbox is equipped with targeted forced lubrication and multi-stage sealing structure:

• Forced circulating oil cooling circuit: High-load models are equipped with an independent auxiliary motor oil pump, which continuously delivers filtered and cooled lubricating oil to bearing raceways and gear meshing surfaces, extending the service life of both lubricant and internal transmission components.

• Multi-stage anti-pollution sealing structure: The rotating shaft outlet adopts a non-contact labyrinth seal matched with high-temperature fluorine rubber skeleton lip seals, completely preventing lubricating oil leakage and blocking workshop dust and powder from entering the box.

Modular Installation to All Kinds of Extrusion Industries

The modular base mounting design of the Horizontal Single-Screw Extruder Gearbox can perfectly match mainstream international extruder frame standards:

• Profile & pipe extrusion production: Stable output torque and melt pressure effectively avoid wall thickness deviation defects of finished pipes and profiles caused by speed fluctuation.

• Waste plastic recycling granulation lines: Ultra-rigid gear structure buffers impact loads brought by irregular recycled flakes to protect the main drive motor from overload damage.

• Continuous wire & cable insulation extrusion: Uniform and stable output rotary speed without jitter ensures consistent coating thickness of rubber or plastic insulation on copper wire cores.

FAQ

Q: Why do ordinary gearboxes break down easily after switching production lines to high-viscosity resin?

A: High-viscosity melt will greatly increase the reverse axial thrust of the screw. The box and internal transmission structure of common gearboxes cannot isolate this axial force, resulting in slight deflection of the transmission shaft, offset of gear tooth meshing contact surface, and rapid tooth wear and fracture. Our Horizontal Single-Screw Extruder Gearbox is equipped with an independent special thrust bearing assembly to completely isolate axial loads and protect drive gears.

Q: Can your factory produce replacement products if we lose the original gearbox drawings and technical documents?

A: Yes. We can customize matching replacement product only according to physical measurement data. You only need to provide input power (kW), required screw rotating speed (RPM), shaft center distance and output spline shaft dimensions. Our technical department will generate 2D engineering drawings for your engineering team to confirm installation sizes before formal production.

Q: What complete inspection certificates and test reports are attached to each shipment?

A: Every finished Horizontal Single-Screw Extruder Gearbox will complete full-load running test in the factory before packaging and shipment. Each order is attached with complete physical quality documents: equipment running noise test report, gear meshing blue printing contact inspection sheet, circulating oil pressure operation record and on-site installation alignment operation manual.