LS Type Screw Conveyor for Cement and Bulk Powder
Standardized Shafted Screw Conveyor for Silo Discharge, Feeding and Short-Distance Powder Transfer
What Is an LS Type Screw Conveyor?
An LS type screw conveyor is a standardized shafted conveying machine that moves dry bulk material through a covered U-shaped trough using a rotating helical screw. Jiangsu LVRUI Machinery supplies LS series conveyors for cement, fly ash, lime powder, mineral powder, gypsum and other dry materials. Standard model diameters, modular trough sections and customized inlet, outlet and drive arrangements make the LS series suitable for common powder conveying and controlled feeding applications.
For a broader comparison of screw conveyor structures and selection factors, see our screw conveyor types and selection guide.
Typical Applications
LS type screw conveyors are commonly used for horizontal or low-incline material transfer in cement plants, grinding stations, dry mortar plants and bulk powder handling systems.
Typical applications include:
✅ Discharging cement or fly ash from silos and hoppers
✅ Feeding dry powder into mixers, packing machines or weighing equipment
✅ Transferring collected dust below a bag filter or other dust collection equipment
✅ Moving material between nearby production units
✅ Returning recovered powder to the production process
✅ Connecting storage, conveying and loading equipment
✅ Providing controlled feeding to downstream machinery
The LS series is most suitable for short- to medium-distance conveying where a standardized shafted screw design is required. Long conveying distances, high inclinations or difficult materials require separate technical evaluation.
Suitable Materials and Operating Limits
Commonly handled materials include:
✅ Cement
✅ Fly ash
✅ Lime powder
✅ Mineral powder
✅ Gypsum powder
✅ Dry mortar ingredients
✅ Collected dust
✅ Other free-flowing dry powders and small granules
Wet, sticky, fibrous or strongly compacting materials may build up around the screw shaft or intermediate bearings. These materials can reduce capacity, increase drive load and create blockage risks.
Abrasive materials may require reinforced screw flights, wear-resistant liners or thicker trough sections. Elevated-temperature applications require confirmation of the bearings, seals, lubricant, screw shaft and casing arrangement.
Clinker, large particles and highly abrasive materials should not be treated as standard powder applications. A chain conveyor or another heavy-duty conveying method may be more suitable.
How Does an LS Type Screw Conveyor Work?
Material enters the trough through one or more inlets. The gear motor rotates the screw shaft, and the helical flights push the material along the casing toward the discharge outlet.
The actual conveying rate depends on:
✅ Screw diameter
✅ Screw pitch
✅ Rotation speed
✅ Material bulk density
✅ Trough filling level
✅ Conveying length
✅ Installation angle
✅ Inlet loading condition
✅ Outlet resistance
Stable operation requires controlled feeding. Excessive or uncontrolled material entry can overload the screw, compact powder inside the trough or cause material accumulation near the outlet.
For feeding applications, screw speed, pitch and inlet arrangement must be selected to control the withdrawal rate from the hopper or silo.
Reference Technical Specifications
| Model | Diameter (mm) | Capacity (t/h) | Speed (rpm) | Motor (kW) | Material Temp |
|---|---|---|---|---|---|
| LS200 | 200 | 3–8 | 60–90 | 2.2–4 | ≤ 120°C |
| LS250 | 250 | 5–15 | 60–90 | 3–5.5 | ≤ 120°C |
| LS315 | 315 | 10–25 | 50–80 | 4–7.5 | ≤ 150°C |
| LS400 | 400 | 15–40 | 50–80 | 5.5–11 | ≤ 200°C |
| LS500 | 500 | 25–60 | 40–70 | 7.5–15 | ≤ 200°C |
These values are provided for preliminary model comparison only. Actual capacity and motor power depend on material bulk density, particle size, moisture, screw pitch, filling level, total length, inclination, feeding method and outlet condition.
The reference material temperature must not be treated as the guaranteed operating limit of the complete machine. Bearings, seals, lubricant, intermediate supports and other components must be confirmed for the actual temperature.
Final specifications should be stated in the approved technical drawing and quotation. For general engineering reference, CEMA publishes standards covering screw conveyor dimensions and bulk material applications.
Key Features
✅ Standardized LS Series Models
Common model diameters simplify preliminary selection for cement and dry powder conveying applications.
✅ Modular Trough Construction
Sectional troughs can be combined according to the required conveying length and transportation limitations.
✅ Covered U-Shaped Casing
Removable covers provide enclosure while allowing access for inspection and maintenance.
✅ Horizontal or Inclined Installation
Low-incline configurations are available after capacity and motor power are recalculated.
✅ Customized Connections
Inlet quantity, outlet position, flange dimensions and drive orientation can match the customer’s process layout.
✅ Material and Wear Options
Carbon steel, stainless steel, reinforced flights and wear-resistant components are available according to the material.
Main Components
A typical LS screw conveyor includes:
✅ U-shaped steel trough
✅ Sectional upper covers
✅ Screw shaft and helical flights
✅ End bearings and intermediate bearings
✅ Gear motor and coupling
✅ Shaft seals
✅ Material inlets and outlets
✅ Support brackets or legs
✅ Inspection and maintenance openings
The final configuration depends on the total length, material, operating duty and installation layout. Longer units may require intermediate bearings and sectional assembly.
LS Type vs U Type vs Tubular Screw Conveyor
| Comparison | LS Type Screw Conveyor | U Type Screw Conveyor | Tubular Screw Conveyor |
|---|---|---|---|
| Main Positioning | Standardized shafted series | Customized U-trough design | Enclosed round-tube design |
| Casing | Covered U-shaped trough | U-shaped trough with removable covers | Continuous circular tube |
| Model Selection | Standard LS model sizes | More flexible custom dimensions | Standard tube diameter options |
| Inspection | Access through sectional covers | Easier internal access and cleaning | More disassembly may be required |
| Installation | Mainly horizontal or low incline | Horizontal or low incline | Compact horizontal or inclined routing |
| Typical Use | General cement and powder conveying | Applications requiring frequent inspection | Enclosed transfer in limited space |
Choose an LS type screw conveyor when standardized model selection and modular construction are important.
Choose a U type conveyor when regular inspection, cleaning or customized trough dimensions are the main requirements.
Choose a tubular conveyor when a continuous round casing and compact routing are priorities.
Information Required for Selection
| Required Information | Details |
|---|---|
| Material | Name, bulk density, particle size and moisture |
| Required Capacity | Conveying rate in t/h, kg/h or m³/h |
| Conveying Length | Total horizontal and inclined distance |
| Installation Angle | Horizontal or required inclination |
| Inlet Arrangement | Quantity, position and feeding method |
| Outlet Arrangement | Position, direction and flange dimensions |
| Material Temperature | Normal and maximum temperature |
| Construction Material | Carbon steel, stainless steel or other requirement |
| Operating Duty | Continuous or intermittent operation |
| Power Supply | Voltage and frequency |
| Layout Drawing | Installation dimensions and connecting equipment |
Please also confirm whether the machine will be used mainly for material transfer, controlled feeding or both.
Material name and required capacity alone are not sufficient for final selection. Inlet loading, installation angle and downstream resistance can significantly affect performance.
Manufacturing, Inspection and Delivery
LVRUI manufactures LS screw conveyors according to the approved dimensions and order requirements.
The supply scope can include the trough, screw shaft, covers, bearings, seals, gear motor, supports and matching connection flanges.
Before shipment, the equipment can be checked for:
✅ Main dimensions
✅ Screw rotation direction
✅ Inlet and outlet positions
✅ Shaft and bearing assembly
✅ Cover arrangement
✅ Drive installation
✅ External appearance and surface treatment
Long conveyors may be divided into transport sections according to container dimensions. Final reassembly and installation are normally completed by the customer or local installation team unless otherwise agreed.
Recent LS Screw Conveyor Orders
These LS type screw conveyors were manufactured according to customer requirements for screw diameter, conveying length, drive arrangement, inlet and outlet connections, and construction material. Each unit was assembled and inspected before packing and delivery.
LS Type Screw Conveyor FAQs
What is an LS type screw conveyor used for?
An LS type screw conveyor is commonly used for horizontal or low-incline conveying and controlled feeding of cement, fly ash, lime powder, mineral powder, gypsum, collected dust, and other dry bulk materials.
When should I choose an LS type screw conveyor?
An LS type screw conveyor is suitable when standardized model diameters, modular trough sections, and customized conveying lengths are required for conventional dry powder handling. Material properties, capacity, conveying distance, and installation angle must still be confirmed before selection.
What is the difference between an LS screw conveyor and a custom U-trough screw conveyor?
An LS screw conveyor is a standardized shafted conveyor series that normally uses common screw diameters and modular U-shaped trough sections. A custom U-trough screw conveyor allows greater flexibility in trough dimensions, screw design, cover arrangement, inlet positions, and maintenance access.
Can an LS type screw conveyor operate on an incline?
Yes, but conveying capacity normally decreases as the inclination increases. Screw diameter, speed, filling level, and motor power must be recalculated for inclined operation.
What causes blockage in an LS screw conveyor?
Common causes include excessive or unstable feeding, wet or sticky material, an obstructed outlet, incorrect screw speed, material buildup, foreign objects, worn screw flights, or poor alignment. The conveyor should be stopped and isolated before inspection. For a more detailed diagnosis, read our guide to screw conveyor blockage causes and practical solutions.
What information is required for an LS screw conveyor quotation?
Please provide the material, required capacity, conveying length, installation angle, bulk density, particle size, inlet and outlet dimensions, operating temperature, operating schedule, power supply, and site layout drawing.
Need an LS Type Screw Conveyor for Your Application?
Send us your material, required capacity, conveying length, installation angle, connection dimensions and site layout. LVRUI will recommend a suitable LS screw conveyor model and configuration based on your operating conditions.
✅ Standard LS200 to LS500 model options
✅ Customized conveying length and connections
✅ Carbon steel and stainless steel configurations
✅ Factory assembly and inspection before shipment