Smart Blanking Light Curtain for Dynamic Press Brake Monitoring
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Solution Overview
Problem
Conventional light curtains for press brakes often cause unnecessary shutdowns and fail to provide adequate protection due to parts breaking beams during operation, while laser guarding is expensive and reduces production speed, and complex systems do not account for dynamic part placement.
Innovation Solution
A light curtain system that performs smart blanking by determining whether beam breaks are acceptable based on stored data, allowing dynamic shape monitoring and enabling safe operation without immediate shutdowns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional light curtain is used to guard a press brake, then safety protection is provided, but unnecessary shutdowns occur because parts break beams during normal operation
Solution Approach 1:
The light curtain system dynamically adjusts beam blanking status based on the real-time position of the press brake tool and part. During bending operations, beams in the working area are automatically blanked (deactivated) to allow part movement without triggering shutdowns. When the tool is retracted or in safe positions, beams are activated to restore safety monitoring. This dynamic adaptation resolves the contradiction by maintaining safety protection only when actually needed, eliminating unnecessary productivity losses.
Solution Approach 2:
The system pre-programmes bending sequences and tool paths to define safe zones and critical areas before operation begins. Based on these pre-established parameters, the light curtain proactively blanking specific beams during anticipated part movement, preventing false shutdowns before they occur. This preliminary configuration allows the system to distinguish between safe part movement and actual safety hazards.
2Reliability
If laser guarding devices are used to provide protection, then safety coverage is improved, but production speed is significantly reduced
Solution Approach 1:
The light curtain system operates dynamically by selectively activating and blanking beams based on the press brake's operational state. During high-speed bending cycles, only essential safety beams remain active while others are blanked to permit rapid part movement. This dynamic beam management maintains comprehensive safety coverage equivalent to laser guarding while preserving production speed, as the system adapts in real-time rather than requiring constant high-speed scanning.
3Reliability
If sequentially programmable beam-blank-out systems are used for complex bending operations, then adequate protection during part manipulation is achieved, but the system does not account for dynamic part placement sequences
Solution Approach 1:
The light curtain system incorporates feedback mechanisms that continuously monitor the actual position of the press brake tool and part throughout the bending sequence. This real-time feedback allows the system to dynamically adjust beam blanking patterns to match the actual part placement sequence, rather than relying solely on pre-programmed static patterns. The system adapts to variations in part positioning and manipulation sequences, enhancing both protection reliability and adaptability to dynamic 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
Enhances safety and productivity by reducing unnecessary shutdowns and enabling efficient operation with dynamic shape monitoring, allowing for complex press brake applications.
Implementation Method 1
The light curtain comprises a plurality of light emitters and a plurality of light detectors, wherein the light emitters emit beams of light toward the light detectors
Data Source
AI summary
A light curtain for use with a machine, such as a press brake. The light curtain is connected to a controller of the machine. The light curtain is configured to provide smart blanking, specifically dynamic shape monitoring. In contract to conventional light curtains, the light curtain does not necessarily automatically send a stop signal to the machine in response to a light been being broken. Instead, the light curtain determines whether the break is acceptable in light of data. If the light curtain determines that the break is acceptable in light of data, no stop signal is sent to the machine. In contrast, if the light curtain determines that the break is unacceptable in light of data, the light curtain sends a stop signal to the machine.