Counter Ejector Elevator Table Dynamics for Cardboard Sheet Transfer
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Solution Overview
Problem
Conventional counter ejectors in cardboard sheet box-making machines face challenges in achieving high-speed transfer of relatively short cardboard sheets due to the need for the elevator to remain stationary during batch handover, resulting in prolonged processing times.
Innovation Solution
The counter ejector design includes a movable front contact plate and elevator table that aligns with the feed direction, allowing the table to move only as much as the front contact plate, and a control device synchronizes these movements to reduce handover time, eliminating the need for the elevator to return to a predetermined position, thus enabling faster batch transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the elevator remains stationary during batch handover to ensure complete transfer, then the handover reliability is improved, but the transfer speed deteriorates due to prolonged stopping time
Solution Approach 1:
The elevator table is made movable in the feed direction instead of being stationary. The table can dynamically adjust its position to match the front contact plate position, allowing it to move forward during sheet feeding and then remain stationary or move slightly during handover. This dynamic positioning enables the system to maintain reliability while reducing the time the elevator must stop, thereby improving transfer speed.
2Adaptability or versatility
If the elevator table width is matched to the maximum dimension of processable cardboard sheet, then the adaptability is improved, but the handover time deteriorates when processing shorter sheets
Solution Approach 1:
The elevator table position in the feed direction is made adjustable rather than fixed. When processing shorter cardboard sheets, the table can be positioned forward to reduce the gap between the front contact plate and the table edge, allowing shorter sheets to be completely transferred in less time. The table width remains matched to the maximum sheet dimension for adaptability, but the positional adjustment optimizes handover time for different sheet lengths.
Solution Approach 2:
The position parameter of the elevator table in the feed direction is changed dynamically based on the cardboard sheet length being processed. For shorter sheets, the table position is adjusted forward, reducing the transfer distance and time. This parameter adjustment maintains the table's ability to handle maximum dimension sheets while optimizing performance for shorter sheets.
3Manufacturing precision
If the front contact plate moves to reduce gap for short sheets, then the manufacturing precision is improved, but the overall process time deteriorates due to elevator stopping
Solution Approach 1:
Both the front contact plate and elevator table are made dynamically positionable in the feed direction. The front contact plate moves to reduce the gap for short sheets, and simultaneously, the elevator table position is adjusted to compensate, ensuring the table edge remains appropriately positioned relative to the sheets. This coordinated dynamic adjustment maintains alignment precision while minimizing the time the elevator must stop for handover, thereby improving batch transfer efficiency.
Data Source
AI summary
A counter ejector of cardboard sheet box-making machine is disclosed. A front contact plate contacting cardboard sheets is movable in a feed direction. A spanker is disposed to face the front contact plate in the feed direction, and contacts the back edge portion of the cardboard sheet, aligning the sheet edge portions. Ledges separate cardboard sheets loaded between front contact plate and the spanker, forming a batch of a predetermined number of sheets. A transfer conveyor transfers batches in a transfer direction, which is the same direction as the feed direction. An elevator is furnished with a table, and carries batches from the height at which the front contact plate and the spanker are disposed to the height at which the transfer conveyor is disposed. The table is moved by the same amount and in the same movement direction as the movement of the front contact plate.