Vacuum System Blow-Off Control Using Centralized Pressure Sensor
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Solution Overview
Problem
Existing vacuum systems for material handling require multiple sensors to sense vacuum pressure at each suction point, leading to complex data management and inefficient energy use due to fixed, longer-than-necessary blow-off times for releasing objects from suction cups, which increases cycle times and energy consumption.
Innovation Solution
A centralized vacuum system using a single pressure sensor to control the blow-off valve, adapting the duration and amount of compressed air based on previous cycles, eliminating the need for sensors at each suction point and optimizing blow-off time through data analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple vacuum sensors are used to sense pressure at each suction point, then measurement precision is improved, but device complexity and data management complexity increase
Solution Approach 1:
The patent consolidates multiple vacuum sensor readings from different suction points into a single centralized evaluation system. The control unit aggregates pressure data from all suction points and determines blow-off timing based on the collective state of the vacuum system rather than treating each sensor independently, thereby reducing data management complexity while maintaining measurement precision.
Solution Approach 2:
The centralized control unit serves multiple functions: it receives data from all vacuum sensors, processes the collective information, determines when blow-off is complete, and controls the blow-off valve. This multi-functional approach eliminates the need for separate control logic at each suction point, simplifying the overall system architecture.
2Reliability
If fixed blow-off time is used to ensure consistent object release, then reliability is improved, but loss of time and energy consumption increase
Solution Approach 1:
The system continuously monitors vacuum pressure at all suction points during the blow-off process and uses this feedback to determine when blow-off is complete. The control unit evaluates real-time pressure data and closes the blow-off valve as soon as the object is successfully released, eliminating the need for fixed, conservative timing and thereby reducing cycle time while maintaining reliable object release.
Solution Approach 2:
The blow-off duration is made dynamic rather than fixed. The system adapts the blow-off timing based on real-time vacuum pressure conditions, allowing the blow-off to last exactly as long as needed for object release and no longer. This dynamic adjustment reduces unnecessary energy consumption and cycle time while ensuring consistent object release.
3Reliability
If longer blow-off activation is used to ensure object release, then reliability is improved, but use of energy increases
Solution Approach 1:
The control unit monitors vacuum pressure in real-time during blow-off and uses this feedback to determine the exact moment when object release is achieved. Compressed air is supplied only until the pressure indication confirms successful release, preventing unnecessary continued operation of the blow-off valve and thereby reducing compressed air consumption while maintaining reliable object release.
Solution Approach 2:
The system applies compressed air for the minimum necessary duration to achieve object release rather than using a fixed excessive duration. By monitoring vacuum pressure and stopping blow-off as soon as release is confirmed, the system avoids the energy waste associated with prolonged compressed air supply while ensuring complete object release.
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
This approach reduces energy consumption and cycle times by ensuring blow-off is only activated as long as necessary, simplifying data management and eliminating the need for multiple sensors, while automatically adapting to application variations without manual intervention.
Implementation Method 1
a vacuum generator driven by compressed air in order to generate a negative pressure
Implementation Method 2
pressurized air is supplied or provided to the vacuum generator
Implementation Method 3
activating, typically opening, a 'blow-off valve' during a period of time until a blow-off is considered finished
Data Source
Figure 1
Figure 2
AI summary
A method for controlling a vacuum generator (3) in a vacuum system (10) for transportation of objects, which vacuum system (10) comprises a vacuum generator (3) driven by a compressed air flow via a first on/off valve (1), wherein the vacuum generator (3) is arranged to be brought in flow connection with the vacuum gripper means (6) comprised in the vacuum system (10), in order to supply vacuum to the vacuum gripper means (6) in result of the compressed air flow, wherein the vacuum system (10) comprises a second valve (2), which is arranged to supply compressed air into the vacuum system (10); one centralized pressure sensor (4) used for monitoring a system pressure (P) inside the vacuum system (10) and for adaptive blow-off; and a vacuum system controller (5), wherein if the on/off valve (1) is not flowing air to the vacuum generator (3), the vacuum system controller (5) indicates a state of no vacuum generation, and the second valve (2) is activated, allowing an amount of compressed air to flow into the vacuum-system (10) for blow-off, using vacuum system properties being characterized with respect to volume and flow-restriction in relation to the blow-off capacity of the blow-off function and for every release cycle wherein blow-off is terminated and excessive air injected into the system is released through the vacuum gripper means, analyzing pressure propagation following blow-off for calculating a duration of when the vacuum system (10) is being fully pressure-equalized (E) in parts of the vacuum gripper means by using a compensation factor (k), wherein the compensation factor (k) is stored and used for the next release cycle.