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Continuous Vertical Bag Conveyor: Proven 16m Multi-Tower

Project Overview

A large-scale agricultural grain processing and chemical raw material distribution complex required an automated multi-level vertical handling system to transfer heavy bagged goods between multi-story processing floors, raw material storage vaults, and finished product shipping docks. The facility operates across a four-story industrial layout requiring high-volume vertical transit across 8.0-meter and 16.0-meter floor elevations. Bags handled consist of flexible woven polypropylene and multi-wall paper sacks ranging from 0.8 meters to 1.5 meters in length, 0.5 meters to 1.2 meters in diameter, and weighing between 20 kg and 60 kg per bag.

Country/Region: East Asia Industrial Logistics Corridor
Client Facility: High-Capacity Raw Material & Finished Goods Distribution Warehouses
Equipment Model: Custom Continuous Vertical Bag Conveyor Network (Models: CVBC-8M-Z, CVBC-16M-Z, CVBC-16M-C)
Industry Classification: Advanced Manufacturing
Total Fleet Deployment: 7 dedicated vertical conveyor towers (3 units of 8m Z-type, 3 units of 16m Z-type, 1 unit of 16m C-type)
Rated Throughput Capacity: 600 bags per hour per individual conveyor tower
Cargo Specifications: Flexible sacks weighing 20 kg to 60 kg (Length: 0.8-1.5m, Diameter/Width: 0.5-1.2m)
Vertical Elevations: 8.0 meters and 16.0 meters multi-tier vertical travel penetrating interior concrete slabs
Structural Integration: 80 mm x 80 mm x 4.5 mm square steel tube frame with RAL 7035 finish and yellow safety enclosures

To meet strict material throughput targets and workplace safety mandates, gradin teams developed a specialized Continuous Vertical Bag Conveyor fleet adhering to ASME B20.1 Safety Compliance for vertical material handling machinery . Each unit operates as a High-Speed S-Conveyor Elevator capable of non-stop vertical elevation, replacing intermittent freight elevators. Plant directors deployed these continuous lifters alongside custom continuous automated conveyor elevators to establish direct logistical links between production mezzanines and ground-floor shipping lines.

Challenge & Solution

Challenge

Transferring 20 kg to 60 kg non-rigid bags across vertical rises up to 16 meters at high cycle rates generates severe mechanical wear, dynamic instability, and floor-opening safety hazards:

Non-Rigid Bag Deformation and Center of Gravity Shifts: Unlike rigid totes or wooden pallets, soft 60 kg material sacks shift shape and fluidize during motion. Uncontrolled lateral sag causes off-center loads on carrier platforms, risking bag entrapment between moving flight plates and guide tracks.
High-Stroke Drive Chain Fatigue Across 16-Meter Elevations: Operating continuous vertical circuits across 16.0-meter floor drops generates extreme tensile loads on drive components. Standard conveyor chains experience pitch elongation and sprocket tooth wear, requiring an industrial-grade 16A Heavy-Duty Carrier Chain to maintain mechanical timing under full dynamic load.
Multi-Floor Penetration Safety and Fire Segregation Compliance: Elevating materials through multiple building floors creates open vertical shafts across concrete slabs. Without a secure Through-Floor Penetration Enclosure, vertical openings present serious personnel fall risks, falling cargo hazards, and air draught issues.
Bidirectional Infeed and Outfeed Flexibility: Raw material warehouses require bi-directional material elevation (intake during morning shifts, line feeding during afternoon runs). The equipment requires a Z-Type Bidirectional Vertical Lifter configuration capable of reversible vertical motion without mechanical jamming.
High-Velocity Infeed Bag Slippage and Jamming: Accelerating 60 kg bags from horizontal conveyors into ascending lift platforms at 600 units per hour causes slip friction. To prevent bag rupture and maintain timing, the infeed requires a Cleated Belt Telescopic Conveyor to meter and stabilize flexible sacks.
Vibration Control and Reversible Drive Kinematics: Dynamic deceleration during continuous reversing introduces severe torsional shock to motors. The drive requires a Variable Frequency Reversible Drive paired with dynamic braking to eliminate jerking during speed transitions.

Solution

Gradin teams delivered a turnkey heavy-duty vertical logistics system featuring robust structural steel fabrication, high-tensile chain drives, and intelligent material transfer automation:

Heavy Square-Tube Structural Framework with Full-Height Safety Mesh: Towers are engineered from 80 mm x 80 mm x 4.5 mm cold-formed square structural steel tubing (F80*4.5mm). The external envelope integrates a Through-Floor Penetration Enclosure finished in RAL 7035 gray-white coating, while floor slab openings feature 1,500 mm high yellow steel perimeter guardrails to eliminate floor hazards.
Bidirectional Z-Type and Descending C-Type Array: The installation deploys six Z-Type Bidirectional Vertical Lifter units (three 8m units and three 16m units) for flexible two-way inter-floor flow, alongside one dedicated 16m C-type descending unit in the finished goods zone. Each unit delivers continuous vertical indexing with zero deadhead return time.
High-Tensile 16A Double-Strand Carrier Chain System: Actuation utilizes an induction-hardened 16A Heavy-Duty Carrier Chain riding in continuous low-friction polymer guide tracks. Heavy-gauge carbon steel carrier flight plates support non-rigid bags up to 60 kg with zero platform deflection across multi-tier vertical travel.
Cleated Belt Telescopic Conveyor Integration: Infeed and discharge handling utilizes 14 custom Cleated Belt Telescopic Conveyor units (2,000 mm x 1,500 mm x 700 mm) paired with mobile expandable roller conveyors. Molded cross-cleats grip soft bags securely, preventing slippage while feeding bags smoothly onto the vertical lift carriers.
Dynamic Bag Stability and Centering Architecture: The internal lift carriage features an integrated Dynamic Bag Stability System utilizing lateral guide rollers and flared low-friction side baffles. This geometry centers bags automatically as they enter, preventing bag corner binding or edge pinch defects.
Intelligent VFD Control with Multi-Sensor Interlocking: Each tower is governed by a Variable Frequency Reversible Drive system managed by a central Siemens PLC. Non-intrusive photoelectric sensors detect bag alignment and speed match incoming conveyor lines, maintaining strict ASME B20.1 Safety Compliance and backing the system with a full 5-year structural warranty.

Technical Specifications

Specification Parameter	Value / Engineering Rating	Component Details & Manufacturing Standard
Equipment Architecture	Continuous Vertical S-Conveyor Elevator	Continuous S-path vertical flight platform network
System Layout Configuration	Z-Type Bidirectional & C-Type Descending	6 bi-directional Z-units (3x 8m, 3x 16m) + 1x 16m C-unit
Total Fleet Deployment	7 Dedicated vertical conveyor towers	Integrated across raw material and finished goods bays
Rated Throughput Rate	600 bags / hour per individual tower	Continuous multi-carrier flight loop, zero deadhead delay
Target Cargo Envelope	Bag Length: 0.8-1.5m, Diameter/Width: 0.5-1.2m	Flexible woven PP sacks and multi-wall kraft paper bags
Rated Payload Capacity	20 kg to 60 kg per bag	Static structural safety factor of 200% (120 kg per carrier)
Vertical Lift Rise	8,000 mm (8.0m) and 16,000 mm (16.0m)	Servicing multi-story floors across concrete slab voids
Main Structural Framing	80 mm x 80 mm x 4.5 mm square steel tube	Cold-formed structural carbon steel tubing (F80*4.5mm)
Floor Opening Protection	Full-height wire mesh enclosure + 1.5m guardrails	1,500 mm high yellow perimeter guardrails at floor openings
Main Drive Chain Standard	16A Heavy-duty double-strand carrier chain	Induction-hardened alloy chain with low-friction wear tracks
Infeed / Outfeed Integration	Cleated belt telescopic conveyors (14 Sets)	2,000 mm x 1,500 mm x 700 mm with transverse vulcanized cleats
Dynamic Centering Mechanism	Low-friction radiused guides & centering rollers	Automatic lateral stabilization preventing edge pinch
Drive Power & Speed Control	Variable frequency reversible gearmotor drive	High-torque helical gearmotor with bi-directional vector VFD
Safety Code Compliance	ASME B20.1 Safety Standard	Compliant with North American conveyor safety directives
Surface Finish & Paint	RAL 7035 gray-white body / Yellow mesh guards	Industrial electro-powder coating with anti-corrosion primer
Structural Warranty Coverage	5-Year Comprehensive Structural Warranty	Full factory warranty on mast framework, guide tracks, and chains

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Continuous Vertical Bag Conveyor: Proven 16m Multi-Tower

Project Overview

Challenge & Solution

Challenge

Solution

Technical Specifications

Project Gallery

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