Last Updated: May 9, 2026

Dumpling Palletizing Station: Teach-Free Cobot Programming and Modular Deployment

Frozen dumpling cartons are often shipped in 15 to 30 kg cases, while larger formats can approach a 50 kg upper limit. Manual palletizing creates high physical workload, unstable shift output, and recruitment pressure. The video below shows a cobot-based dumpling palletizing workstation designed for medium-to-heavy cartons, teach-free programming, modular deployment, and human-robot coexistence.

If the embedded player does not load, open the video directly on YouTube: Cobot Palletizing: How Collaborative Robots Stack 30kg Dumpling Cartons.

Workstation Configuration and Cobot Selection

The workstation uses a collaborative robot as the execution core, supported by modular equipment for safe palletizing near operators. Core components include the cobot, a dedicated vacuum-plus-support gripper, lifting base, conveyor interface, pallet positioning mechanism, safety fencing, light curtains, and PLC-based control.

For frozen food carton palletizing, cobot selection starts from payload margin. Most dumpling cartons fall in the 15 to 30 kg range, but the system should be checked against the heaviest SKU. A 20 to 30 kg payload cobot can be used when the gripper design shares the load, but the effective robot payload should stay below about 80 percent of the rated payload during normal production.

Reach is the second constraint. A 1500 to 1800 mm reach class is typically needed to cover conveyor pickup, pallet placement, and vertical stack height. For broader robot selection, compare EVS product categories such as collaborative robot, palletizing robot, and pick and place robot.

Medium-to-Heavy-Load Gripper and Bottom Support

The key to medium-to-heavy-load cobot palletizing is not the robot alone; it is the gripper. This workstation uses a composite gripping structure: vacuum suction cups hold the carton top surface, while a sliding bottom support plate carries part of the carton weight during transfer. This prevents the cobot joints from carrying the full carton mass through the entire motion.

For a 30 kg carton, the bottom support plate can carry about 18 kg while the robot effectively carries about 12 kg, leaving a useful payload margin. For a 50 kg upper-limit carton, the bottom support may carry about 30 kg while the cobot carries about 20 kg. In that condition, acceleration should be reduced from about 1 m/s2 to 0.5 m/s2 to control joint torque and reduce wear.

The bottom support plate is typically pneumatically driven. It extends at the pick position, supports the carton during horizontal travel, retracts at the place position, and is synchronized through PLC control. For a comparable product reference, the QJAR 30 kg pick and place robot shows the payload and reach range commonly evaluated for carton handling tasks.

Teach-Free Programming Technology

Traditional palletizing robots require an engineer to teach every trajectory point. This workstation uses teach-free programming by converting palletizing into a parameter model. The operator enters carton length, width, height, weight, pallet size, conveyor height, and target stack pattern on a teach pendant or tablet interface. The system then calculates placement coordinates and generates robot trajectories automatically.

For new carton models, the practical target is to complete parameter input, trial operation, and basic adjustment within about 15 minutes. Hand-guiding can still be used for fine-tuning in special cases, but the final adjusted trajectory should be saved back into the recipe library so the next changeover does not require re-teaching.

This approach is especially useful in frozen food plants where SKU changes are frequent, operators are not robot programmers, and the same palletizing cell may serve multiple carton sizes across different shifts.

Cycle Time Control at 6 to 8 Seconds per Carton

The target cycle is 6 to 8 seconds per carton for typical 15 to 30 kg cases. A standard cycle includes conveyor arrival, robot move to pick position, vacuum pickup and support plate extension, transfer to pallet, placement alignment, support plate retraction, and return to standby. With coordinated conveyor pre-feed, the robot can carry one carton while the next carton is already moving into the pickup position.

Cobot speed is usually limited below 1 m/s in collaborative mode. Cycle time therefore depends heavily on path planning and avoiding unnecessary intermediate points. For full-load 50 kg cases, the robot may need lower acceleration, extending the cycle to about 8 to 10 seconds. If the production line requires a stable 6-second output under heavy-load conditions, two cobots can be deployed on opposite sides in alternating operation.

Collaborative Safety and Human-Robot Coexistence

The advantage of a cobot palletizing station is safer operation near people, but the system still requires layered safety design. Joint torque monitoring, adjustable collision thresholds, reduced-speed zones, light curtains, laser scanners, and perimeter fencing should be configured as one safety system.

In a typical setup, the robot runs below 1 m/s in collaborative mode and slows to about 0.25 m/s when personnel approach. If a person enters the stop zone, the robot stops immediately. A 1.2 m safety fence around the palletizing area and overhead safety scanning can help prevent unsafe entry paths while preserving operator access for pallet changes and maintenance.

Modular Deployment for Food Plants

The workstation can be built on a modular base with casters and retractable leveling feet. Deployment follows a short sequence: position the module, lock the feet, connect the conveyor, connect power and air, enter palletizing parameters, and run test cycles. A practical deployment target is under four hours after the site utilities and conveyor interface are ready.

Cold and humid environments require additional planning. Frozen food plants may run near low-temperature zones, where seals and lubricants harden. If the cell operates near cold storage at around -18 C, specify low-temperature seals and grease. Vacuum cups can also suffer from condensed water freezing, so heating rings, dry air treatment, or a bottom-support-primary gripping strategy may be needed.

Common Technical Bottlenecks

Carton size variation. If carton dimensions vary beyond about +/-5 mm, stack alignment can degrade. Upstream carton squaring or guide mechanisms should be added.

Vacuum loss. Wet, frosted, or deformed cartons reduce suction reliability. A bottom support plate gives the system a second mechanical holding path.

Payload boundary operation. Running near the 50 kg limit accelerates joint wear. Semi-annual torque calibration and gearbox inspection are recommended.

Operator access conflicts. Pallet replacement, film wrapping, and forklift traffic must be included in the layout. Safety zones should protect people without forcing frequent nuisance stops.

Project Summary

A dumpling cobot palletizing station is valuable when a frozen food plant needs fast deployment, flexible carton recipes, and safer operation near people. The engineering center is the gripper: the bottom support plate determines how much load the robot actually carries, which then determines cycle time, joint torque, and long-term reliability.

Teams planning a similar carton palletizing cell should validate actual carton weights, surface condition, cold-room exposure, pallet patterns, and operator access before finalizing the robot model. For project discussion, use the EVS contact page.

Last Updated: May 9, 2026