Sheet Metal Forming Machine Assembly with Decoupled Loading and Unloading Devices
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Solution Overview
Problem
Existing sheet metal processing systems face inefficiencies in workpiece changes and productivity due to sequential dependencies between loading and unloading processes, which can lead to time-consuming operations and potential contamination of raw sheets.
Innovation Solution
A loading device that can be decoupled from the unloading device and moved into separate functional positions, allowing for parallel processing of picking up raw sheets from storage and unloading processed products, with a height-adjustable pallet lift serving as both an intermediate storage and pallet changer to minimize transport routes and structural complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a sequential loading and unloading process is used, then the system structure is simple, but the productivity is reduced due to time-consuming operations
Solution Approach 1:
The handling device is segmented into functionally independent loading and unloading devices that can operate in parallel. The loading device includes a loading arm and a pallet lift, while the unloading device includes an unloading arm. This segmentation allows simultaneous loading of raw sheets and unloading of processed products, resolving the productivity limitation of sequential operations.
Solution Approach 2:
The loading device and unloading device are designed with dynamic, movable components including articulated arms with multiple degrees of freedom and a height-adjustable pallet lift. These dynamic elements enable flexible positioning and parallel operation, allowing the system to maintain simplicity while achieving improved productivity through concurrent operations.
2Loss of time
If loading and unloading processes are performed in sequence, then the device complexity is low, but the time for workpiece changes increases
Solution Approach 1:
The pallet lift pre-positions pallets at different heights before loading operations begin. Raw sheets are loaded onto work pallets that are already positioned at the appropriate height, eliminating the need for time-consuming height adjustments during the loading process. This preliminary positioning of pallets significantly reduces workpiece change time.
Solution Approach 2:
The system maintains continuous useful action by enabling parallel loading and unloading operations. While the loading arm loads raw sheets onto work pallets, the unloading arm simultaneously removes processed products from collection pallets. This continuity eliminates idle time and reduces the overall time for workpiece changes.
3Object-affected harmful factors
If an intermediate charger is used, then the loading process is simplified, but the risk of contamination of raw sheets increases
Solution Approach 1:
The intermediate charger is extracted from the system and replaced by a direct loading mechanism. The loading arm picks up raw sheets directly from storage pallets and places them onto work pallets without intermediate handling. This elimination of the intermediate charger removes the contamination risk while the articulated loading arm provides the necessary flexibility.
Solution Approach 2:
The loading arm acts as a clean intermediary between storage pallets and work pallets. It transfers raw sheets directly without contact with potentially contaminated surfaces, using its gripper mechanism to hold and position sheets. This intermediary approach eliminates contamination risks associated with intermediate chargers while maintaining loading efficiency.
4Area of stationary object
If multiple intermediate storage locations are arranged vertically, then the area is reduced, but the device complexity increases
Solution Approach 1:
The system transitions from horizontal to vertical arrangement of storage locations by implementing a multi-level pallet lift structure. Pallets are stored and positioned at different vertical heights, allowing the system to reduce its horizontal footprint while maintaining multiple storage locations. The pallet lift mechanism provides the necessary vertical movement capability.
Solution Approach 2:
The pallet lift serves multiple functions: it stores pallets at different heights, positions pallets for loading operations, and facilitates the vertical movement of work pallets. This multi-functional design reduces the need for separate horizontal storage areas and transport mechanisms, thereby reducing overall system area while managing the complexity through functional integration.
Data Source
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AI summary
The assembly (1) for working sheet plates, e.g. laser cutting (2), has a workpiece store (4) with loading (7) and unloading (8) units and intermediate storage (6). The intermediate storage has a number of storage places (15a-15c) for pallets (19) carrying workpieces to the workstation and returned pallets. A loading unit transfers a workpiece sheet for working (20) from a supply pallet (18a) to the feed pallet for the workstation, moving between loading and transfer positions. An unloading unit transfers the worked workpiece (21) from the returned pallet to a collection pallet (18b).