Archimedys screw assembly recommendations

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Screw configurations

You can see here a video example of screw assembly Assembly of a DN 150

With all modules types you can build a screw according to the product to convey and installation configuration. For DN9 and 12, FRH a,d TRH are not mandatory.

Views of screw configuration

Type 1 Type 2 Type 3 Type 4 Type 5 Type 6
Screw with variable pitch 1.jpg
Screw with variable pitch 2.jpg
Screw with constant pitch 3.jpg
Screw with constant pitch 5.jpg
Screw with constant pitch 4.jpg
Screw with short pitch 6.jpg
Screw with two flanges. Input and output are perpendicular to the screw axis. Short pitch at the entrance ensure a regular troughput with 50% max screw filling Screw with one flange and ending, feeding is perpendicular to the screw axis and the output can be in the direction of the screw or perpendicularly to it. Short pitch at the entrance ensure a regular troughput with 50% max screw filling Screw with one flange and ending, feeding is perpendicular to the screw axis and the output can be in the direction of the screw or perpendicularly to it. As no feeding modules are at the entrance, care must be taken to avoid over filling and torque peak dammgeable for the conveyor Screw with two flanges. Input and output are perpendicular to the screw axis. As no feeding modules are at the entrance, care must be taken to avoid avoid filling and torque peak dammgeable for the conveyor Classical screw design with constant pitch. As no feeding modules are at the entrance, care must be taken to avoid over filling and torque peak dammgeable for the conveyor this particular configuration with only short pitch is used when inclination is over 70°, vertical elevator or dosing screws.

End side configuration

Hexagonal steel shaft are available anywhere in the world in different type of steel. Machining endings can easily been done by your local supplier. You will find here general type of construction according to the type of drive unit and end bearings. On request we can provide execution drawings according to your conveyor layout.


Hexagonal end side 1.png

Configuration A : Without shaft machining and using a standard hexagonal bushes. The locking on the shaft is done with a pin simply drilled when all modules are on position. This side can be use to fit bearings.

End Shaft 4.png

Configuration B : The hexagonal shaft is turned to reach an approriate diameter. Then a simple bushed is used to lock modules in position with a pin. A thread can be done at the shaft ends in order to help modules locking. This side can be use to fit bearings.

End Shaft 3.png

Configuration C: When the material flow in the direction of the screw, it is possible to lock modules in position with a classcial screw and a steel washer. The washer should have the same diameter as module core.

Drive side configuration

Hexagonal drive shaft.png

Configuration 1 : the steal hexagonal shaft is not machined. You can use a standard hex bushes with a cylindrical zone in order to fit the motor connection. the fixation of the bushes is done with two pin. the key nut can be done directly on the bushes.


Hexagonal drive shaft 2.png

Configuration 2 : The steal hexagonal shaft is not machined. You can add on the bushes an extra saft when hollow coupling are used.

Drive shaft D.png

Configuration 3 : In this configuration you need to machinize the shaft and add bushes. Fixation is done xith two pin on the shaft side.

Drive shaft C.png

Configuration 4 : You can machinized the end of the shaft and add a steel bushes in order to lock modules in position. The key nut is done on the shaft.

Drive shaft B.png

Configuration 5 : The hexagonal shaft is machinized according to the shape of the end shaft. This configuration is mainly used when a long drive tail is requested

Locking the screw

The main condition to obtain a durable function is to lock modules with a small pressure between each side of the screw. 

You will find here the recommended compression level per screws on standard modules.

Modules Diameter DN50 2" DN 76 3" DN 102 4" DN 150 6" DN 230 9" DN 305 12"
Compression in mm/m 1 1 1.5 2 2.5 2.5
Compression in inch/ft 0.013 0.013 0.018 0.024 0.03 0.03