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Progress presentation Group1

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Information about Progress presentation Group1
Education

Published on January 8, 2008

Author: Quintilliano

Source: authorstream.com

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Cabinetron Advanced Cabinet Design:  Cabinetron Advanced Cabinet Design Group 1: Lisa Aversa Roya Ghazizadeh Kyle Kenney Daniel Suarez ME 423 Senior Design November 1, 2005 Advisor: Prof. Chung Project Overview:  Project Overview Design an automated system - Cabinetron - that will make all the shelves in a standard kitchen cabinet easily accessible to the user This motorized system will bring out and lower the hard to reach cabinet shelves Design Focus:  Design Focus Motorized cabinet assembly to make shelves easily accessible Developing Specifications: Cabinet Body Movement Safety Requirements Controls Weight Limits Forces and Torque Power input Budget Design Objectives:  Design Objectives Motorized cabinet assembly Improve upon existing designs Incorporate customer needs Consider design for manufacturability Minimize components Lower cost of the unit Consider: Cabinet body Movement Safety Controls Extra features Expectations & Assumptions:  Expectations & Assumptions Assumptions: Installed in a home in US Weight inside the cabinet is evenly distributed Product may be used by careless individuals Expectations: Cabinet body weighs about 40lbs Inside contents of cabinet about 50lbs Countertop is 18” below the cabinet in up position Design Concept -1:  Design Concept -1 4-bar mechanism with a motorized hoist Two 4-bar mechanisms keep the cabinet parallel to countertop Motorized hoist controls movement of cabinet Cable under constant tension There will be space lost behind the cabinet because of the arms Estimated cost: $310 Disadvantages: Use of cable/chain - Noise - Constant tension - Jerky motion - Not easily modified - Lubrication Design Concept -2:  Design Concept -2 4-bar mechanism with motorized arms Two 4-bar mechanisms keep the cabinet parallel to countertop Top two arms are motorized and controls movement of cabinet Motor needs to have high torque of about 2800 in.lb There will be space lost behind the cabinet because of the motor Estimated cost: $500 Disadvantages: Gear motor connected to the arms - Requires a high torque motor - Motor size will be big - Motor will be costly - Space lost due to motor - Not easily modified for other applications Design Concept -3:  Design Concept -3 4-bar mechanism with a linear actuator Two 4-bar mechanisms keep the cabinet parallel to countertop Linear actuator controls movement of cabinet There will be space lost behind the cabinet because of the arms Estimated cost: $390 Disadvantages: Linear actuator - Space lost on top of the cabinet assembly - Axial forces applied to actuator upon movement Criteria for Selection:  Criteria for Selection Motor power – using electrical power / AC power Noise – minimizing the noise Smooth motion – eliminating jerk Space constraints – more space behind the cabinet Motor torque – reasonable torque Ease of maintenance Cost – affordable Safety Design Comparison:  Design Comparison Relative Performance Rating Much worse than reference 1 Worse than reference 2 Same as reference 3 Better than reference 4 Much better than reference 5 Final Design Selection:  Final Design Selection Using linear actuator: Smooth linear movement – eliminates jerk Saves some space behind cabinet body – can be placed on top of the cabinet body Hold a dynamic load of 250lbs and a static load of 500lbs Includes the motor and the gear box Safety features Easily modified for other applications Design Dimensions:  Design Dimensions Technical Approach:  Technical Approach Electric linear actuator – provide power to lift weight of cabinet safely and smoothly Four-bar mechanism – guide arms for arc path of cabinet Momentary switch controls movement – stops the cabinet where desired Obstacle detector – stops movement if obstacle is detected Limit sensor – stops motor from working past limit of motion Expected Performance:  Expected Performance Cabinet assembly will move up to 200 lbs Cabinet assembly will hold a static load up to 500 lbs Increased accessibility for inside cabinet Cabinet assembly moves 14” down and 14” toward the user Move time of about 10 seconds Life cycle of about 10 years Safety features Obstacle detection Limit sensors Momentary switches 3D CAD Modeling:  3D CAD Modeling Up-position CAD Modeling Cont’:  CAD Modeling Cont’ Down-Position COSMOS Analysis:  COSMOS Analysis Used max stress condition Cabinet in down position Higher force than anticipated No supports other than the links being perpendicular to the wall Forces applied to accomidate for 200lb load of the cabinet Assume forces are distributed evenly FEA Analysis – Guide Arm:  FEA Analysis – Guide Arm Arm material: - Chrome Stainless Steal Yield strength: 24,999 psi Tensile strength: 59,999 psi Dimensions: - 14 in x 1 in x 1/2 in Boundary Conditions: - Fixed at one end Load: - Force of 50lbs applied at one end FEA Analysis – Guide Arm:  FEA Analysis – Guide Arm Stress Plot Max stress: 10,000 psi Displacement Plot Max displacement: 3.27e-2 FEA Analysis – Guide Arm:  FEA Analysis – Guide Arm Strain Plot Max strain: 2.268e-4 Design Check Min FOS: 8.3 FEA Analysis – Actuator Hinge:  FEA Analysis – Actuator Hinge Bolt material: - Chrome Stainless Steal Yield strength: 24,999 psi Tensile strength: 59,999 psi Dimensions: - ½ in x 2 in Boundary Conditions: - Fixed at one end Load: - Force of 212 lbs applied at both end FEA Analysis – Actuator Hinge:  FEA Analysis – Actuator Hinge Stress Plot Max stress: 3,115 psi Displacement Plot Max displacement: 1.043e-4 FEA Analysis – Guide Arm:  FEA Analysis – Guide Arm Strain Plot Max strain: 8.334e-5 Design Check Max Shear Stress Min FOS: 7.4 FEA Analysis – Actuator Hinge:  FEA Analysis – Actuator Hinge Bolt material: - Chrome Stainless Steal Yield strength: 24,999 psi Tensile strength: 59,999 psi Dimensions: - 1/4 in x 2 in x 2 in Boundary Conditions: - Fixed at the back Load: - Force of 106 lbs applied to each hole FEA Analysis – Actuator Hinge:  FEA Analysis – Actuator Hinge Stress Plot Max stress: 1,258 psi Displacement Plot Max displacement: 6.493e-5 FEA Analysis – Guide Arm:  FEA Analysis – Guide Arm Strain Plot Max strain: 2.93e-5 Design Check Max Shear Stress Min FOS: 19 Inside Features:  Inside Features Optional addition to the cabinet assembly Gear track mechanism Brings the inside baskets to the user upon opening the door Easier to reach the contents in the back Adjustable levels for placing the multiple baskets Inside Modeling:  Inside Modeling Front View Top View Bill of Materials:  Bill of Materials Linear Actuator:  Linear Actuator Duff-Norton TMD250-MP Linear actuator can push/pull 250 lbs Holds static force of up to 500 lbs Moves at 143 in/min Entire movement would be completed in about 8 seconds 18” stroke Actuator will not require lubrication Safety:  Safety Obstacle Detection Similar to sensor on modern car bumpers to detect obstacles Will be programmed to detect obstructions within a few inches from bottom of cabinet May need to use multiple sensors for best coverage of area under cabinet Limit Sensors – 59200 Lever Arm Similar to sensors used in bumpers for robots Lower switch place by bottom guide arms Higher switch placed near top of the cabinet Shuts off linear actuator to keep cabinet from moving too far Momentary Switch – Single Pole Momentary Button Requires pushing the button for the continued movement Proposed Budget:  Proposed Budget Other Possible Markets:  Other Possible Markets In addition to kitchen cabinets, our design can be modified for garage cabinets and other heavy duty applications Modifications necessary due to the increase in weight: Heavy duty stainless steel cabinet body Larger size guide arms for more strength Two linear actuators instead of one Addition of a gas piston for damping effects for larger load Design Problems:  Design Problems Attaching the cabinet assembly to the wall so that the weight is evenly distributed Attaching the linear actuator to the cabinet body Minimizing parts, making it compact and aesthetically pleasing Safety sensors and mechanical brakes Keep the shelves of the cabinet leveled and stop them from tipping Having a smooth movement and eliminating jerk Project Deliverables:  Project Deliverables Detailed design of the cabinet assembly 3-D CAD modeling FEA Analysis using CAD software Calculations Complete bill of materials Proposed budget Economic model to determine feasibility and profitability Expected performance Project Planning:  Project Planning What’s Next?:  What’s Next? Finalizing design Working out the details of the design Making a final weight and cost estimation Making the design adjustable for other applications Heavy duty loads in workshops and other locations Finalizing bill of material and budget Questions:  Questions

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