Cart Tipper Position Interlock for Packer Blade Collision Prevention
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Solution Overview
Problem
Cart tippers on refuse trucks are prone to damage from the packer blade of waste trucks due to overlapping 3D operation spaces, leading to collisions and costly repairs.
Innovation Solution
A proximity sensor on the cart tipper detects its position relative to the collision zone, activating a hydraulic interrupt valve to prevent the packer blade from moving when the cart tipper is in a dangerous position, using inductive proximity sensors or rotary actuators with metallic shafts to control hydraulic fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the packer blade is independently actuated to complete full compaction cycles, then productivity is improved, but the risk of collision with cart tipper increases
Solution Approach 1:
A proximity sensor continuously monitors the cart tipper position and provides feedback to the control system. When the sensor detects that the cart tipper is in the collision zone, it automatically interrupts the packer blade operation by deactivating the hydraulic control valve, preventing collision while allowing independent actuation cycles to proceed when safe
Solution Approach 2:
The proximity sensor detects the cart tipper position in advance before collision occurs. The control system uses this early warning to preemptively interrupt packer blade operation, preventing the harmful collision before it happens while maintaining productivity when the zone is clear
2Reliability
If the packer blade operation is restricted when cart tipper is in collision zone, then reliability is improved, but productivity deteriorates
Solution Approach 1:
The packer blade operates in periodic cycles of compaction and return. The control system allows these cycles to proceed uninterrupted when the proximity sensor confirms the cart tipper is outside the collision zone, maintaining full productivity. When the sensor detects entry into the collision zone, the cycle is temporarily interrupted, then resumes automatically when safe, achieving periodic operation that balances reliability and productivity
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
Prevents collisions between the cart tipper and packer blade, minimizing damage and reducing repair costs by inhibiting packer blade operation when the cart tipper is in a collision zone.
Implementation Method 1
an inductive proximity sensor is mounted in the housing of the rotary actuator or outside the actuator in proximity to the shaft of the rotary actuator; the inductive sensor senses the presence of the metallic shaft based on the rotary position of the arcuate slot in the metallic shaft
Data Source
AI summary
The waste truck having a hydraulically operated packer blade in combination with a hydraulically operated rotary cart tipper driven by a rotary actuator. The packer blade resides within a chamber of the truck and is movable therein. The hydraulically driven rotary actuator of the cart tipper rotates the cart tipper from a first down position to a second up position and includes a metallic shaft with an arcuate slot therein sensed by an inductive proximity sensor. The diverter valve is a solenoid operated, 2-way normally open, pilot operated poppet valve and functions as a hydraulic interrupt valve which permits safe operation of the hydraulically operated packer blade and prevents collisions of the packer blade with the rotary cart tipper.