Palletizer Exit Safety Barrier for Variable Pallet Sizes
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Solution Overview
Problem
Existing safety devices for palletizers often fail to effectively prevent unauthorized access due to inability to distinguish between pallets and users, leading to potential injuries and increased costs, especially with varying pallet sizes and irregular stacking heights.
Innovation Solution
A safety device with a security element that can be adapted into multiple states to match the size of the pallet unit, using a combination of mechanical and optical components to ensure secure access, including sliding doors and light curtains, to prevent user access while allowing pallet transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If detection sensors are used to monitor the exit area and shut down the machine when a user attempts to access it, then safety against unauthorized access is improved, but the sensors cannot distinguish between pallet and user so they must be switched off when pallet leaves, creating blind spots and dead spaces
Solution Approach 1:
The patent introduces an intermediary element (the safety device with light barrier and evaluation unit) between the existing sensors and the control system. This intermediary processes the sensor signals intelligently, distinguishing between pallets and users based on detection patterns, thereby maintaining safety protection while eliminating the need to switch off detection during pallet exit.
Solution Approach 2:
The patent replaces the simple mechanical on/off switching of detection sensors with an intelligent evaluation system that continuously processes sensor data. This substitution allows the system to maintain detection functionality while using logic to differentiate between legitimate pallet passage and unauthorized user access, eliminating blind spots.
2Reliability
If roller doors are installed to close during palletizing process, then safety against unauthorized access is improved, but they fail to consider varying product sizes and create gaps between pallet and conveyor unit
Solution Approach 1:
The patent replaces static roller doors with a dynamic safety system that continuously monitors and responds to the actual state of the conveyor area. The light barriers and evaluation unit adapt the safety response in real-time based on detected objects, allowing the system to maintain protection while accommodating varying pallet sizes and configurations without physical gaps.
Solution Approach 2:
The patent substitutes mechanical roller doors with an optical detection and control system. This replacement eliminates the need for physical barriers that create gaps, using instead light barriers that can detect objects of any size and trigger appropriate safety responses, thereby improving adaptability to varying pallet dimensions.
3Ease of operation
If detection sensors are switched off when pallet leaves the system, then false safety shutdowns are prevented, but protection against dead spaces and blind spots is lost
Solution Approach 1:
The patent implements a feedback-based evaluation system that continuously monitors sensor signals and adjusts safety responses accordingly. The evaluation unit analyzes detection patterns to determine whether an object is a pallet or a user, providing continuous feedback that maintains both operation continuity and safety coverage without requiring sensors to be switched off.
Solution Approach 2:
The patent replaces the mechanical on/off control of detection sensors with an intelligent evaluation system that maintains continuous detection. This substitution allows the system to provide uninterrupted safety coverage while using logical evaluation to prevent false shutdowns during normal pallet exit operations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The safety device provides enhanced protection against unauthorized access by dynamically adjusting to different pallet sizes, reducing the risk of injury and operational costs while maintaining efficient pallet transport.
Implementation Method 1
a light barrier (12) is provided, which spans a conveyor outlet (3.1) of the conveying unit (3)
Data Source
Figure 1~2
Figure 3~4
Figure 5~7
AI summary
The invention relates to a safety device (10) for a palletizer (1) with at least one safety element (11) which can be arranged on a conveying unit (3) of the palletizer (1) that serves to transport pallet units (4), wherein the safety element (11) increases security against unauthorized access to the conveying unit (3) by a user. The invention further relates to a system with a palletizer (1) and a safety device (10) and a method (100) for securing a conveying unit (3) of a palletizer (1).