The Complete Guide to Twin Screw Assembly and Installation

Introduction:
Twin screws are widely used in the plastics extrusion, pelletizing, chemical, and food industries. The assembly and installation of twin screws are critical steps to ensure their proper operation.

Preparatory Work:
Confirm the installation location and direction to select the appropriate screw.

Prepare the necessary tools for installation, including wrenches, screwdrivers, pliers, jacks, and levels.

Confirm the size and model of the selected twin screw and read the instructions carefully.

Clean the installation site to ensure there is no debris or obstacles.

Assembly/Installation Steps:
1. Screw Cleaning:

Use gasoline or other cleaning agents to clean the surface of the screw from dirt and grease.

Wipe clean with a clean cloth, making sure there is no residue.

2. Screw Element Treatment:

Lightly sand the surface of each screw element with fine sandpaper to remove burrs.

Wipe clean with a clean cloth to ensure there is no dust.

3. Screw Assembly:

Assemble according to production instructions or drawings, paying particular attention to the "phase" of the first screw element.

Lubricate the threaded connections with high-temperature oil and tighten with screws.

Use a splined sleeve to adjust the screw gap to ensure it is within the specified range.

4. Installation:

Install the assembled twin screw on the equipment, paying attention to the alignment of the center line.

Use a level to ensure the twin screw is installed horizontally.

Secure the screw and check that the connection is secure.

5. Trial Run:

Conduct a no-load test run to check if the screw is running smoothly and os there any noise.

Gradually increase the load during the trial run to observe the performance of the screw.


Professional Insights:
Screw "Phase": refers to the direction of the threads of the first screw element, which will affect the conveying efficiency and mixing effect of the twin screw.

Screw Gap: refers to the gap between adjacent screws, which will affect the shearing action of the twin screw and the melting effect of the material.

Screw Material: Common screw materials include stainless steel, tool steel, alloy steel, etc., and different materials have different wear resistance and corrosion resistance.

Screw Surface Treatment: Common screw surface treatments include chrome plating, nitriding, spraying, etc., and different surface treatments can improve the wear resistance and corrosion resistance of the screw.