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Shaftless screw (spiral)

We manufacture shaftless spirals for the industry standards, as well as custom designed spirals.

Our machines are capable of rolling the thickest and tightest flights.

We will be able to supply shaftless spirals for your new projects, or as replacements parts for existing shaftless screw conveyors, sludge conveyors, screw feeders, screw presses, inclined shaftless screw conveyors, vertical shaftless screw conveyors or any other equipment using shaftless screws.

To get a quick history of the shaftless screw conveyor, you can read our article Origin of the Shaftless screw.

Shaftless spirals are normally used to convey sticky materials in centreless screw conveyors. The spiral lays on liners and is driven at one end by a gear box. A shaftless spiral will allow the movement of more materials than a shafted of the same size.

As there is no shaft or hanger bearings, the material runs free without the problems of sticking to, or wrapping around the shaft. The shaftless conveyor can be up to 90 meters and can run in either direction. Vertical, Inclined, Horizontal, Pushing, Pulling, are being used in all kinds of applications: municipal waste, sludge screw, sand screw, screenings, pulp and paper, breweries, and many others. With a wear liner of UHMW giving smooth running, little or no noise, making for a quiet safe working environment.

Procedure to order a shaftless spiral

 

Right hand / Left hand, push or pull

Your spiral can either be a right hand or a left hand.

Your spiral can be pushing, pulling or both, A pushing spiral is conveying material away from the gear box. A pulling spiral is conveying material toward the gear box.

When ordering a spiral, we need to know if your spiral is a "Right hand (RH) pushing", "RH pulling", "LH pushing" or "LH pulling".

Material

The material for your spiral can be stainless steel (300 series and duplex), Mild steel (coated, plated or not), harder steel, or any special request (including Swedish steel) (all special request proposed by our clients are evaluated on the specific needs of the client).

Length

The total length for the shaftless spiral can be given to S2S Industries. We deliver "per section" of 4 meters on average (to be welded or bolted together by the client.) We can possibly deliver in smaller sections (more welds for the client) or longer sections upon special inquiries.

Single fligths

A single flight spiral is characterized with the following dimensions:

  •  The outside diameter (OD)

  •  The pitch (linear distance between two flights)

  •  The section of the ribbon: height (A) and thickness (B) 

Multiple flights

A double (or multiple) flight is characterized with the following dimensions:

  •  The outside diameters (OD)

  •  The pitch (linear distance between two flights)

  •  The type of multiple spiral

  •  The section of the base ribbon: height (A) and thickness (B)

  •  The section of the tip/insert/reinforcement ribbon: height (C) and thickness (D)

Coupling discs

Your spiral is coupled to the drive shaft with a coupling disc (or End plate.) S2S Industries always includes "torsion bars" at the connection between the spiral and the coupling disc. A coupling disc is characterized with the following dimensions:

  •  Outside diameter (OD) (usually the same as the spiral OD)

  •  Thickness

  •  Center hole diameter (drive shaft diameter)

  •  Number of bolt holes

  •  Bolt holes diameter

  •  Distance from bolt holes to disc center hole

Shafted screw (spiral)

We manufacture shafted spirals per the industry standards, as well as custom designed spirals.

We can supply screws for your new projects, or as spare parts for your existing equipment such as screw conveyors, screw presses, screw feeders...

Shafted spirals are normally used to convey granular type materials. The screw is driven at one end by a gear box and supported by one end bearing and several hangers bearing (depending on the length) along the spiral. We supply shafted spirals as per CEMA standards, and made to order ones.

If you need a reminder of the reasons to use a screw conveyor, take a look at our article : why use a screw conveyor?

 

Procedure to order a shafted spiral

 

Right hand / Left hand, push or pull

Your spiral can either be a right hand or a left hand.

Your spiral can be pushing, pulling or both, A pushing spiral is conveying material away from the gear box. A pulling spiral is conveying material toward the gear box.

When ordering a spiral, we need to know if your spiral is a "Right hand (RH) pushing", "RH pulling", "LH pushing" or "LH pulling".

Material

The material for your spiral can be stainless steel (300 series and duplex), Mild steel (coated, plated or not), harder steel, or any special request (including Swedish steel) (all special request proposed by our clients are evaluated on the specific needs of the client).

Length

The length for a shafted spiral is "per section". Sections are assembled together by the client.

Ribbon flights

The ribbon flight for a shafted conveyor is characterized with the following dimensions:

  •  The outside diameter (OD)

  •  The thickness of the flight

Shaft

L’arbre de transmission pour un convoyeur à arbre est caractérisé par les dimensions suivantes :

  •  Le diamètre extérieur (OD)

  •  L’épaisseur des parois

Coupling

Connection to the drive shaft, intermediate shaft and end shaft can be done in several ways : 

  1. Shafts directly provided and welded to the spiral pipre : S2S Industries can machine and weld a shaft directly in the pipe of your spiral, at one or both ends

  2. Coupling with sleeve and pins

The coupling is defined with the following parameters : 

  • Sleeve ID and length

  • Number of pin holes

  • Diameter of pin holes

  • Distance between holes and to the sleeve end (and angles)

   3. Coupling discs

The coupling is defined with the following parameters : 

  • Shaft diameter, disc diameter and thickness

  • Number of holes, diameter and positioning.

Special designs / features

If you need some special features design, we also manufacture:

  •  Hollow screws

  •  Cooling screws

  •  Heating screws

Sectionals and auger flighting

We supply all industry standards of sectional flighting, auger flighting, screw flights or ribbon flights.

Shafted spirals are manufactured by welding sectional flights or ribbons to a pipe or tube.

Sectional flights (also called flight by flight) require a weld joint between each flight.

Ribbons come in manufacturing length 5ft to 8ft long, depending on the spiral geometry.

S2S Industries offers the welding service, as per the client welding specification (stitch welds, full weld, sport weld...) or can deliver directly flight or ribbon, for the client to weld.

Procedure to order a flight

Right hand / Left hand

Your screw conveyor flighting, or auger flighting can either be a right hand or a left hand.

If you think about a bottle opener, a right hand spiral screws into the cork when you turn to the right (clockwise.) A left hand spiral would screw when you turn to the left (counter clockwise.)

Material

The material for your spiral can be stainless steel (300 series and duplex), Mild steel (coated, plated or not), harder steel, or any special request (all special request proposed by our clients are evaluated on the specific needs of the client).

Length

The length for a ribbon flight is "per manufacturing section". Sections are assembled together by the client (welded onto the shaft for shafted conveyors.)

The length for a sectional flight depends on the diameter and pitch required. Sections are to be assembled together by the client (welded onto the shaft.)

Flights

The ribbon or sectional flight for a shafted conveyor is characterized with the following dimensions:

  • The outside diameter (OD)

  • The thickness of the flight

  • The inside diameter (OD) or shaft OD

Conveyor wear liners

We supply municipal and industrial wear liners (UHMW, Pure gum rubber, Stainless steel, mild steel, Hardox) for shaftless screw conveyors.

Standard liners

Hardox liners

Hardox liners are used in very abrasive applications.

The liners are comprised of a backing sheet in Stainless and Hardox bars.

Backing sheet is on average 2 to 3 mm thick, Cw with locking tangs, to be installed into the conveyor through.

Standard Hardox bars are 12 to 15 mm thick and 30 to 40 mm wide, in Hardox 400 Brinell.

Conveyor components

Listed below is our stock parts for industrial screw conveyors:

  • Gear boxes
  • Drive shafts

  • Sealing (packing gland)

  • Bearings

  • Spiral brushes

  • Wedge wire baskets

  • Longopac® (endless bags)

  • Motion sensors

  • Safety pull switch cables

  • Etc.

 We supply all shaftless and shafted screw conveyor accessories for both municipal and industrial applications.

PAXXO Longofill Longopac

S2S Industries is an authorized reseller for Paxxo Longopac® and Longofill® products. 

 

Longofill is a closed bag system for screenings, grit and sludge

It was designed to minimize all the inconveniences brought by the screenings, grit and sludge handling, such as the mess, spillage and risk for unhealthy bacteria and bad odor.

For sewage treatment plants, whatever their size might be, the handling of screenings, grit and sludge is a recognized environmental and health problem. Even with the progress made during the last decades, principally improving ventilation in most of the screening and press buildings, there is still a risk for a high concentration of bacteria and fungus spores to develop. These factors can have an impact on the air quality, and lead to an unhealthy work environment resulting in increased probability for chronic asthma, allergies and diseases in the pulmonary tissues and the intestinal tract.

Longofill solves this problem in both a practical and efficient way. Longofill consists of a closed bag system, which can easily be connected to the discharge point of your machine. The screenings, grit or sludge is deposited into the continuous Longopac bag, which will also provide odor containment and help control spillage associated with the collection of wet screenings and grit. The Longopac is easy to seal and the material and odors are trapped inside the Longopac bag.

Longofill

The cassette holder is manufactured in stainless steel (SS304) and ABS plastic. It is designed to fit on any discharge chute with an outside diameter of 5.9 inches (150 mm) up to 15 inches (380 mm).

Longopac

The cassette is a continuous liner manufactured in environmentally sound polythene that can be incinerated without any hazards. This kind of endless bag is available in different lengths, Contact us if you want to know more about it.

Longofill 1: Cassette holder designed for mounting to a machine with horizontal discharge.

Longofill 2: Cassette holder designed for mounting to a machine with vertical discharge.

Longopac: The cassette is manufactured in environmentally sound polythene

We keep a stock of Longopac and Longofill at all time for fast delivery.

Applications

Table with several applications and field of use for screw conveyors.