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Reciprocating Vertical Conveyor Platform: Robust 1000kg

Project Overview

The Reciprocating Vertical Conveyor Platform is a high-speed automated vertical transfer system engineered for multi-level material handling without requiring architectural pit excavation. Utilizing an 11kW SEW brake motor drive, dual safety gear mechanisms, and integrated 5-strand chain conveyors, this system achieves vertical speeds up to 60m/min and seamless 1000kg pallet transportation across a 7m stroke Based on 12 years of non-standard automation field implementations, industrial manufacturing plants frequently face severe floor space constraints and civil engineering limitations that prevent floor pit excavation. This project required a fully automated, continuous material handling solution spanning a mezzanine level (2nd floor) and the ground floor (1st floor) with a total vertical lifting stroke of 7000mm.

  • Target Country/Region: East Asia Industrial Zone.

  • Client Facility: 2-Level Automated Production & Logistics Warehouse (Steel-Structure Platform Installation).

  • Equipment Model: GRADIN VRC-1000-Z70.

  • Core Handling Target: 1000kg Palletized Goods compatible with 9-Leg Pallets (11501150mm) and Block Pallets (1200800mm, long-side entry).

  • Key Operational Parameters: 7000mm vertical lift stroke, 0-60m/min variable frequency speed, zero pit installation (700mm docking height on 1st level).

  • Compliance Standard: Designed per ASME B20.1 Safety Standard for Conveyors and Related Equipment 

To address site layout constraints, the design integrates a Pitless Vertical Goods Lift architecture with a Z-type entry/exit flow pattern along the 1700mm axis.  According to ASME B20.1 standards, vertical reciprocating conveyors operating above 0.5m/s must incorporate dynamic overspeed sensing and mechanical safety interlocks Our custom solution deploys a Dual-Pallet Compatible Conveyor line featuring 5-strand motor-driven chains and yellow PVC fast-rolling shutter doors with inspection windows, fully interfaced with a Siemens PLC control network for full-cycle automation. For more detailed system configurations, explore our Reciprocating Vertical Conveyor Platform  product lineup.

Challenge & Solution

Challenge

In multi-story automated warehouse implementations, legacy vertical lifts frequently experience structural fatigue, guide shoe binding, and mechanical jamming when subjected to unsymmetrical pallet dynamic forces and zero-pit restrictions. The site engineering evaluation identified three critical physical bottlenecks that required non-standard engineering overhauls.

  • Physical Zero-Pit Constraint: The ground floor required zero pit excavation (Floor level 0), fixing the carriage conveyor docking height at 700mm. Standard under-slung drive mounting and pit polyurethane buffers could not be installed, requiring an upper-frame SEW Driven Freight Elevator layout to maintain flat levelling accuracy across a 7000mm elevation.

  • Dual-Pallet Dynamic Eccentricity: The system must handle both 9-leg pallets (11501150mm) and block pallets (1200800mm, long-side entry) carrying up to 1000kg. Variations in base support contact points generated shifting centers of gravity (CoG), placing high shear stresses on T90 guide rails and TK5A counterweight guides during rapid acceleration without a specialized Safety Gear Counterweight Lift framing.

  • High-Speed Throughput & Multi-Stage Transfer Bottlenecks: Transporting pallets across 8 continuous operational stages (2nd floor intake -> scissor conveyor -> bridge conveyors -> twin 90-degree turntables -> vertical lift -> 1st floor discharge -> forklift retrieval) created severe risk of line accumulation without precise millisecond-level Siemens PLC Vertical Conveyor control tracking.

Solution

To resolve site geometry limitations and extreme dynamic load variations, our engineering team re-architected the main hoisting chassis and integrated an automated conveyor routing network tailored specifically for the Reciprocating Vertical Conveyor Platform.

  • Upper SEW Motor Drive & Counterweight Balancing Topology: Implemented a top-mounted 11kW SEW brake motor drive running 20A heavy-duty duplex chain drives with 0-60m/min variable frequency vector control. A TK5A counterweight rail system offsets live carriage payload, enabling smooth start-stop ramps for the Pitless Vertical Goods Lift without foundation pit depth.

  • 5-Strand Chain Conveyor Carriage & Mechanical Safety Systems: Fabricated a 100504mm rectangular tube carriage housing a dedicated 5-Strand Chain Conveyor Lift mechanism (2 outer dual-strand lines, 1 center triple-strand line). Dual mechanical safety gear sets (safety clamps) and high-impact polyurethane buffers guarantee fall protection, while dual yellow PVC fast-rolling shutter doors with viewing windows enforce ISO-compliant physical containment.

  • Siemens PLC Multi-Zone Control & Turntable Integration: Deployed a Siemens PLC and inverter automation network featuring twin 7-inch HMI touchscreen terminals and national safety light curtains. Overheight and overwidth photoelectric detection sensors continuously audit oncoming freight prior to feeding the 90-Degree Pallet Turntable Lift units and hydraulic scissor indexing lines (±50mm stroke adjustment), creating an Automated Pallet Transfer Elevator with uninterrupted material flow.

Technical Specifications

Engineering Category Parameter & Feature Specifications System Integration & SK Embed
System Classification Reciprocating Vertical Conveyor Platform (2 Stop, 2 Station Z-Flow) Pitless Vertical Goods Lift Architecture
Rated Load Capacity 1000kg Dynamic Payload Capacity Automated Pallet Transfer Elevator Standard
Lifting Stroke & Speed 7000mm Vertical Elevation, 0-60m/min Variable Frequency Speed SEW Driven Freight Elevator Execution
Main Hoist Drive 11kW SEW Motor with Electro-Mechanical Brake Safety Gear Counterweight Lift Drive
Carriage Dimensions W1700mm * L1400mm * H1400mm (Carriage frame, excluding conveyor) Dual-Pallet Compatible Conveyor Platform
Conveyor Mechanics 5-Strand Chain Conveyor (2 outer dual-strand, 1 center triple-strand) 5-Strand Chain Conveyor Lift Carriage
Conveyor Speed & Drive 6-15m/min Variable Frequency Speed, Motor-Driven Siemens PLC Vertical Conveyor Integration
Pallet Compatibility 9-Leg Pallets (11501150mm) & Block Pallets (1200800mm Long-Side) Dual-Pallet Compatible Conveyor Capability
Structural Frame Steel Main Frame F120, Connectors J100504, Top Frame J120605 Safety Gear Counterweight Lift Chassis
Carriage Fabrication 100504mm Rectangular Steel Tube + 3mm Steel Deck Plate Automated Pallet Transfer Elevator Frame
Guiding Mechanics T90 Main Guide Rail + Fasteners, TK5A Counterweight Rail Pitless Vertical Goods Lift Rails
Directional Turntables 2 Units of 90-Degree Turntable Conveyors 90-Degree Pallet Turntable Lift Subsystem
Auxiliary Indexing Line Hydraulic Scissor Lift Conveyor (L1500W1250H700-1150mm, 2.2kW) 5-Strand Chain Conveyor Lift Feeder
Safety Mechanisms 2 Mechanical Safety Clamps + Polyurethane Energy Buffers Safety Gear Counterweight Lift Standard
Perimeter Containment Dual Yellow PVC Fast-Rolling Doors with Inspection Windows Pitless Vertical Goods Lift Enclosure
Automation Controller Siemens PLC + Inverter System, Dual 7-Inch HMI Touch Panels Siemens PLC Vertical Conveyor Control
Detection Sensors Overheight / Overwidth Photoelectric Sensors & Light Curtains SEW Driven Freight Elevator Protection

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