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Pet Extruder Machine Speed Variator Plastic Extruder Gearbox
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Pet Extruder Machine Speed Variator Plastic Extruder Gearbox

High torque density <13 Nm / cm³ per shaft

  • zhitian

twin screw extruder parts

Pet Extruder Machine Speed Variator Plastic Extruder Gearbox



Zhitian's twin-screw gearbox is an ideal solution for industries such as plastics, food, and battery slurry mixing. Our products are known for their high efficiency and reliability. To meet the growing demand for twin-screw extruders, we have developed a range of co-rotating twin-screw extruder gearboxes, with a maximum torque of up to 18 Nm/cm³. Our series include ZT-A, TDF, TDSN, STD, SHTDN, SHTDZ, and SHE.

gearbox for twin screw extruders



Zhitian gearboxes feature excellent heat dissipation and oil lubrication systems, providing stable output capabilities under heavy load conditions. The gearbox structure consists of a primary reduction section and a distribution section. It offers a compact design, low noise, strong load-bearing capacity, and high production yield.

The gearbox housing is made of high-strength ductile cast iron, manufactured with high-precision CNC machining to ensure consistent strength and accuracy. The design incorporates a high-rigidity housing with shock absorption features.

Our gear manufacturing process is mature, using low-carbon alloy steel (ME) as the material. The gears are meticulously ground and tooth profiles are carefully shaped. Carburizing and quenching processes are employed to achieve a surface hardness of HRC58-62.

We utilize high-load and long-life bearings from globally renowned brands, incorporating multiple optimized bearing design solutions.

Zhitian gearboxes have gained recognition in the industry for their outstanding performance and reliability, becoming the preferred solution for various industries. We will continue to innovate and improve to meet the evolving needs of our customers.


What is a Twin Screw Extruder Gearbox?

The twin-screw extruder gearbox is indeed a vital component of the twin-screw extruder. It serves as the link between the motor and the screws, transferring power efficiently to enable the extrusion process.

One of the key requirements for the twin-screw extruder gearbox is its robustness and durability. The gearbox operates under high-viscosity and high-pressure conditions, which exert significant forces on the gears and other components. Therefore, the gearbox must be constructed with strong and durable materials that can withstand these challenging conditions.

The design and construction of the gearbox also involve considerations such as gear accuracy. The gears need to be precisely manufactured to ensure smooth and efficient power transmission. Any inaccuracies or imperfections in the gear design can lead to decreased performance or even failure of the gearbox.

Material selection is another crucial aspect of twin-screw extruder gearbox design. The chosen materials must possess high strength, excellent wear resistance, and good heat dissipation properties. 

Furthermore, the gearbox requires an effective lubrication system to minimize friction and wear between the gears. Lubrication is crucial for reducing heat generation, ensuring smooth operation, and prolonging the gearbox's lifespan. Proper lubrication design involves selecting the right lubricant, ensuring adequate lubricant circulation, and implementing appropriate cooling mechanisms.

The twin-screw extruder gearbox's reliable and effective operation is paramount for achieving the desired extrusion results. It is an indispensable component in various industries, including plastic processing, food processing, and the chemical industry. Without a well-designed and properly functioning gearbox, the twin-screw extruder would not be able to process materials efficiently, resulting in reduced productivity and suboptimal product quality.

gearbox for twin screw extruders

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 Contact us!


NANJING ZHITIAN is specialized in the manufacturing of replacement parts for twin screw extruder. So for has more than 20 years experience. 



  +86-25-52294748 / +86-137-70960051
  Ms.Esther Li (Sales Manager)
    +86 13770960051
   Tianyuan community, Chunhua street, Jiangning district, Nanjing, China.


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