Flexible Vacuum End Effector for Gentle Mushroom Picking
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Solution Overview
Problem
Existing mushroom harvesting methods, particularly in commercial settings, face challenges in automating the process efficiently due to the delicate nature of mushrooms, which are prone to damage from manual handling and require frequent picking to prevent overgrowth, while existing automated systems have been unsatisfactory in accommodating the irregular growth patterns and angles of mushrooms.
Innovation Solution
An automated mushroom harvesting system utilizing a SCARA arm with a flexible end effector, comprising a resilient neck and flexible cup designed for vacuum attachment, capable of conforming to irregular mushroom shapes and applying controlled force to minimize damage, combined with a vision system for precise targeting and a multi-robot configuration to cover large areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If manual labour is used to harvest mushrooms, then the mushrooms can be picked with care to avoid damage, but the harvesting frequency is limited to two or three times per day which causes mushrooms to become overgrown between pickings
Solution Approach 1:
The patent replaces manual mechanical picking with an automated robotic system that uses a vision system to identify mushrooms and a controlled end effector to harvest them. This substitution enables more frequent harvesting (multiple times per day) while maintaining gentle handling through precise control of the picking mechanism, thus resolving the contradiction between careful handling and harvesting frequency.
Solution Approach 2:
The patent changes the control parameters of the harvesting system by using a vision system to detect mushroom size, position, and orientation, then adjusting the end effector's motion parameters (speed, force, angle) accordingly. This enables frequent harvesting while adapting to each mushroom's specific characteristics to minimize damage, resolving the contradiction between productivity and mushroom integrity.
2Productivity
If automated picking systems are used to increase harvesting frequency, then productivity improves, but the systems struggle to accommodate irregular growth patterns and angles of mushrooms
Solution Approach 1:
The patent employs a dynamically controllable end effector that can adjust its position, orientation, and motion trajectory in real-time based on vision system feedback. The robotic arm can accommodate various mushroom angles and positions by dynamically modifying its approach, enabling high-frequency harvesting while adapting to irregular growth patterns that rigid automated systems cannot handle.
Solution Approach 2:
The patent implements a closed-loop control system where the vision system continuously monitors mushroom position, orientation, and size, and feeds this information back to the robotic controller. The controller adjusts the end effector's motion parameters based on this feedback, enabling the system to adapt to irregular growth patterns while maintaining high harvesting frequency, thus resolving the contradiction between productivity and adaptability.
3Productivity
If pressure is applied to mushrooms during picking to remove them from the bed, then the mushrooms can be harvested efficiently, but even small amounts of pressure may result in bruising and damage
Solution Approach 1:
The patent uses a pneumatic or vacuum-based end effector that creates negative pressure to gently lift mushrooms from the bed without applying compressive force. This pneumatic approach enables efficient harvesting by creating sufficient lifting force through pressure differential while avoiding the bruising that occurs with direct mechanical contact and compression, thus resolving the contradiction between picking efficiency and mushroom integrity.
Solution Approach 2:
The patent introduces a soft, compliant intermediary material in the end effector that distributes any necessary contact forces over a larger area and reduces peak stresses on the mushroom tissue. This intermediary layer enables efficient mushroom release from the bed while minimizing bruising, resolving the contradiction between picking efficiency and damage prevention.
4Object-affected harmful factors
If the casing soil surface is made rough to protect mushroom pinheads from air flow drying, then mushroom protection improves, but the mushrooms grow at angles other than normal to the shelf plane
Solution Approach 1:
The patent uses a dynamically adjustable end effector that can modify its approach angle and orientation based on the mushroom's growth angle. The vision system detects tilted mushrooms, and the robotic arm dynamically adjusts its motion parameters to approach from the appropriate angle, enabling harvesting of mushrooms growing at various orientations without damaging them, thus resolving the contradiction between protection measures and growth pattern accommodation.
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 system effectively harvests mushrooms with minimal damage, optimizes picking frequency, and covers the entire mushroom bed area, improving yield and quality by adapting to the irregular growth patterns and angles of mushrooms.
Implementation Method 1
an end effector adapted for connection to a vacuum line, the end effector comprising: a flexible cup affixed to a resilient neck, the neck including an inlet for a vacuum line
Data Source
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AI summary
An automated mushroom harvesting system for mounting to a vertical mushroom rack comprises a robot having a frame mounted to a vertical carriage assembly. A SCARA arm is slidably mounted to the vertical carriage assembly by a vertical stage, operable to move the SCARA arm along a vertical mast. The SCARA arm moves the end effector in a horizontal plane for harvesting mushrooms, above the surface of the mushroom bed and into and out of the confines of the mushroom rack, and the vertical stage moves the SCARA arm in a vertical direction so as to access the mushrooms in a bed and to access mushroom beds on different levels of the vertical mushroom rack. An end effector having a helically reinforced neck and a graduated elasticity modulus, with a lower elasticity modulus in the neck and a higher elasticity in the cup, is also provided.