Description
Screw Conveyor Manufacturer for Cement and Bulk Materials
Screw Conveyor / Cement Screw Conveyor
Screw Conveyor systems for cement, fly ash, lime powder, dry mortar, mineral powder and granular materials are manufactured for horizontal transfer, inclined feeding and silo discharge.
Available outer tube diameters include 168 mm, 219 mm, 273 mm, 323 mm, 325 mm, 407 mm and 425 mm. Conveyor length, inlet and outlet positions, flange dimensions, installation angle, screw shaft arrangement, motor, gear reducer and support structure can be configured around the actual equipment layout.
The supply range covers:
- Complete cement screw conveyors
- Horizontal and inclined tubular screw conveyors
- Conveyor bodies with internal screw shaft assemblies
- OEM screw conveyors built to confirmed drawings
- Replacement conveyors for existing installations
- Individual screw conveyor spare parts
Typical conveying routes include cement silo to weighing hopper, silo outlet to mixer inlet, powder hopper to packaging equipment and horizontal transfer between processing machines.
Screw Conveyor Models and Technical Specifications
| Specification | 168 | 219 | 273 | 323 | 425 |
|---|---|---|---|---|---|
| Screw Flight Diameter (mm) | 140 | 190 | 250 | 290 | 390 |
| Outer Diameter (mm) | 168 | 219 | 273 | 323 | 425 |
| Allowable Angle (°) | 0–60 | 0–60 | 0–60 | 0–60 | 0–60 |
| Max process capacity (T) | 20 | 30 | 50 | 80 | 110 |
| Motor Power (kW) | 2.2–15 | 2.2–22 | 3–22 | 5.5–22 | 5.5–22 |
| Outer Pipe Thickness (mm) | 3–8 | 3–8 | 3–8 | 4–8 | 4–8 |
| Rotary Speed (r/min) | 288 | 288 | 205 | 144 | 144 |
The table covers the standard 168 mm, 219 mm, 273 mm, 323 mm and 425 mm screw conveyor models. The 325 mm and 407 mm sizes are also available with project-specific internal and drive configurations.
The listed Max process capacity (T) should be used as a model reference rather than treated as fixed output under every working condition. Final performance is affected by:
- Material bulk density and flowability
- Powder or particle characteristics
- Total conveying length
- Horizontal distance and vertical lift
- Installation angle
- Inlet feeding condition
- Screw speed
- Continuous or intermittent operation
- Starting with an empty or loaded conveyor
The final model, motor and gear reducer are confirmed after these operating conditions have been reviewed.
Available Screw Conveyor Configurations
Horizontal screw conveyors are used where the feeding and discharge points are positioned at approximately the same elevation. Common locations include the underside of storage silos, powder hoppers, dosing units, mixers and packaging systems.
Inclined cement screw conveyors transfer material from a lower discharge point to an elevated weighing hopper, mixer or storage unit. Horizontal distance and vertical lifting height should be provided separately because the installation angle directly affects material movement and drive load.
Customized tubular screw conveyors are produced when standard connection positions do not fit the surrounding equipment. The conveyor can be configured around an existing silo outlet, hopper, mixer inlet, weighing system or supporting structure.
| Configuration Item | Available Options |
|---|---|
| Outer Tube Diameter | 168, 219, 273, 323, 325, 407 and 425 mm |
| Conveyor Length | Manufactured according to the required conveying route |
| Installation | Horizontal or inclined |
| Inlet | Customized position, opening size and flange |
| Outlet | Customized position, direction and flange |
| Screw Assembly | Flight diameter, pitch, thickness and shaft sections |
| Drive System | Motor power, reducer ratio, output speed and drive direction |
| Supports | Bracket design and support-point positions |
| Inspection Access | Inspection hatch position according to maintenance access |
| Connections | Flanges, transitions and universal joint |
A nominal tube diameter does not define one fixed conveyor configuration. Two 273 mm conveyors may require different motors, reducers, shaft supports and inlet designs when their lengths, angles or materials are different.
Complete Conveyor and Matching Spare Parts
The tubular housing, screw shaft and drive system are matched as one conveyor assembly.
A complete screw conveyor can include:
- Conveyor tube
- Screw flight and shaft assembly
- Electric motor
- Gear reducer
- End bearing
- Shaft seal
- Inlet and outlet flanges
- Inspection hatch
- Support brackets
Longer sectional conveyors may also use a hanger bearing and shaft coupling between adjacent screw shaft sections.
A universal joint can be installed between a vertical silo outlet or butterfly valve and the inlet of an inclined cement screw conveyor. It provides a material passage between the two connection points and does not transfer drive torque.
Replacement parts can be supplied separately for maintenance or conveyor rebuilding.
| Spare Part | Details Needed for Identification |
|---|---|
| Gear Reducer | Conveyor diameter, motor power, ratio, mounting flange and output spline |
| End Bearing | Conveyor diameter, shaft connection and mounting-hole dimensions |
| Hanger Bearing | Conveyor diameter, shaft diameter, spline and number of teeth |
| Shaft Coupling | Spline dimensions, internal shaft tube diameter and coupling length |
| Screw Flight | Flight diameter, pitch, thickness, direction and shaft dimensions |
| Screw Shaft Assembly | Overall length, section length, coupling position and connection ends |
| Shaft Seal | Shaft diameter, seal housing and mounting dimensions |
| Inspection Hatch | Conveyor diameter, opening dimensions and installation position |
| Universal Joint | Upper connection, lower connection and conveyor inlet angle |
Similar-looking parts are not always interchangeable. Shaft spline, number of teeth, mounting pattern and connection length should be checked before a replacement part is ordered.
New Conveyors, OEM Units and Direct Replacements
New Screw Conveyor
For a new conveying system, the conveyor is selected from the material, required process capacity and route between the feeding and discharge points.
The arrangement can be built for:
- Silo discharge
- Mixer feeding
- Weighing and dosing
- Packaging lines
- Powder storage
- Dry bulk processing equipment
- Horizontal transfer between machines
OEM Screw Conveyor
OEM conveyors can be manufactured according to an approved equipment drawing. Inlet position, outlet direction, flange pattern, support points and drive orientation can be fixed to suit the machine into which the conveyor will be installed.
Replacement Screw Conveyor
Replacement conveyors are manufactured to fit the interfaces that will remain in place.
Matching the outer tube diameter alone is not sufficient. The following dimensions should also be confirmed:
- Overall conveyor length
- Distance between inlet and outlet
- Inlet flange and opening
- Outlet flange and opening
- Installation angle
- Drive direction
- Reducer mounting position
- Support locations
- Shaft and spline dimensions
- Available maintenance clearance
The replacement can be supplied as a complete conveyor, a mechanical body without the motor, an internal shaft assembly or individual parts.
Existing motors and reducers should only be reused after their output speed, torque, flange and shaft connections have been checked against the new conveyor.
Information Required for Selection and Quotation
For a new cement screw conveyor or tubular screw conveyor, please provide:
- Conveyed material
- Required process capacity
- Horizontal conveying distance
- Vertical lifting height
- Installation angle
- Preferred tube diameter, when already specified
- Inlet position and dimensions
- Outlet position and dimensions
- Motor voltage and frequency
- Continuous or intermittent operation
- Empty or loaded starting condition
- Indoor or outdoor installation
- Complete conveyor or mechanical assembly only
For replacement projects, also provide:
- Overall installed dimensions
- Center distance between inlet and outlet
- Flange and bolt-hole measurements
- Drive orientation
- Motor and reducer nameplate
- Existing support positions
- Photographs of both conveyor ends
- Original drawing, when available
A simple layout showing the feeding point, discharge point, horizontal distance and vertical height is normally enough to begin configuration. The final dimensions should be confirmed on the production drawing before manufacturing.
Frequently Asked Questions
Why does a screw conveyor with the correct diameter still deliver less material than expected?
Nominal diameter does not determine output by itself. Low delivery can result from a steep installation angle, restricted inlet, insufficient material feeding, unsuitable screw speed, material fallback or an internal screw arrangement that does not match the application.
Required output should be confirmed at the discharge point. Material bulk density, horizontal distance, vertical lift and feeding method are needed before the final configuration is selected.
Can a 219 mm or 273 mm conveyor directly replace another conveyor with the same tube diameter?
Not always. The tube diameter may be the same while the overall length, inlet spacing, flange pattern, reducer interface, shaft spline, support position and drive direction are different.
Replacement orders should be checked against the actual installation dimensions rather than identified only by nominal diameter.
What happens when the screw conveyor frequently starts while full of cement?
Starting under load requires more torque than starting with an empty conveyor. Repeated loaded starts place additional demand on the motor, gear reducer, shaft coupling and screw shaft assembly.
When loaded starting is part of normal operation, the drive and internal assembly must be selected for that condition before production.
Should we use a larger motor when the conveyor becomes longer or more inclined?
A larger motor may be required, but motor power alone does not determine whether the conveyor will operate correctly. Tube diameter, reducer torque, screw speed, flight arrangement, shaft support and inlet condition must also be suitable.
An undersized conveying section or restricted inlet cannot be corrected simply by fitting a more powerful motor.
When should a hanger bearing be included in the conveyor?
Hanger bearings are used to support longer sectional screw shafts. Their positions must correspond with the shaft couplings and the gaps between adjacent screw flight sections.
The required quantity depends on the overall length, shaft arrangement and operating load. It should be confirmed as part of the complete conveyor design rather than added after the shaft assembly has been manufactured.
What information is needed when replacing only the screw flight or internal shaft assembly?
Please provide the outer tube diameter, internal tube diameter, total shaft length, screw flight diameter, flight pitch, flight thickness, shaft tube dimensions, rotation direction and connection details.
Photographs should show the complete shaft assembly and both connection ends. Measurements taken from heavily worn areas may not represent the original dimensions, so less-worn sections should be used wherever possible.
