Bidirectional Grinder Blades for Anti-Jamming
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Grinder pumps and disposers face jamming issues due to hard objects like needles and non-biodegradable materials, leading to costly maintenance and system failures, particularly with the influx of thick wastes and flushable wipes that do not break down during processing.
Innovation Solution
The implementation of a Special improvement package for heavy-duty grinders, known as the Gorilla Grinder, which includes a variable speed motor with a three-phase stator and VFD control, bidirectional cutting blades, and a strainer basket, allowing for reversible operation and anti-jamming modes to address clogs and contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standard grinder pump is used, then it can process normal waste, but it jams when encountering hard objects or thick wastes like flushable wipes
Solution Approach 1:
The patent applies a variable speed motor that can dynamically adjust its rotational speed based on load conditions. The motor controller monitors current draw and automatically reduces speed when jamming is detected, allowing the grinder to power through obstructions like flushable wipes and hard objects without stalling or jamming. This dynamic speed adjustment transforms a static motor system into an adaptive one that responds to varying waste conditions.
Solution Approach 2:
The invention changes the operational parameters of the motor by implementing variable speed control with multiple predefined speeds (e.g., high speed for normal operation, low speed for heavy duty grinding). This parameter change allows the same motor to handle both light and heavy waste materials effectively, resolving the contradiction between reliability and complexity by using a single motor with adjustable parameters rather than multiple fixed-speed motors.
2Productivity
If a variable speed motor is implemented, then grinding efficiency improves, but device complexity and cost increase
Solution Approach 1:
The variable speed motor system dynamically adjusts rotational speed to optimize grinding efficiency for different waste types. During normal operation, the motor runs at high speed for efficient pumping and light grinding. When heavy duty grinding is detected (through current monitoring), the motor automatically transitions to low speed mode, providing maximum torque for grinding through tough materials like flushable wipes and thick wastes, thereby improving overall productivity.
Solution Approach 2:
The single variable speed motor performs multiple functions that would traditionally require separate devices: it acts as both a high-speed pump for normal waste and a low-speed heavy-duty grinder for tough materials. This multi-functionality improves productivity across all waste types while avoiding the complexity of installing multiple specialized motors, making the system universally applicable to various grinding scenarios.
3Reliability
If bidirectional cutting blades are used, then clog clearing capability improves, but mechanical complexity increases
Solution Approach 1:
The blade assembly is designed to rotate in reverse direction to clear clogs. During normal operation, blades rotate forward to grind waste. When a clog is detected (through motor current monitoring), the motor automatically reverses rotation, causing the blades to spin backward and dislodge the obstruction. This inversion principle allows the same blade assembly to perform both grinding and clog-clearing functions, improving reliability without requiring separate blade mechanisms.
Solution Approach 2:
The blade assembly operates in periodic cycles of forward rotation for grinding and brief reverse rotation for clog prevention and clearing. The control system monitors operational parameters and automatically initiates reverse rotation when jamming is detected, then returns to forward rotation once the clog is cleared. This periodic bidirectional action maintains reliability by continuously preventing and clearing clogs while adding minimal mechanical complexity through simple motor control.
4Object-affected harmful factors
If a strainer basket is added, then contaminant handling improves, but device complexity and maintenance requirements increase
Solution Approach 1:
The strainer basket extracts and removes large contaminants and debris from the waste stream before the waste enters the grinding chamber. By taking out these problematic materials upfront, the strainer basket protects the motor and grinding blades from damage and reduces the likelihood of jams, thereby improving contaminant handling capability while maintaining relatively simple maintenance procedures.
Solution Approach 2:
The strainer basket performs preliminary filtration of waste materials before they reach the grinder. This preliminary action removes excessive debris, foreign objects, and large contaminants that could cause problems during grinding. By addressing contaminant removal in advance, the system reduces the burden on the grinding mechanism and simplifies maintenance, as the grinder only needs to handle pre-filtered waste material.
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 solution reduces maintenance costs, provides effective grinding of thick wastes and flushable wipes, and prevents system failures by allowing for variable torque and speed, dual-directional cutting, and enhanced handling of contaminants, thereby minimizing the need for frequent repairs and improving waste processing efficiency.
Implementation Method 1
a variable speed motor with a three-phase stator and VFD control
Data Source
AI summary
An improvement kit for heavy duty grinders to process thick wastes in commercial and residential applications made of a two directional cutter having a two-blade cutter edge, a multi aperture die cup, a shaft for pump with an anti-rotational feature, a mimicking component for mimicking three phase drive to a motor stator on the pump, a control board/panel and circuitry and wiring to interconnect the components and a stator winding that allows the kit to provide a grinding solution for contamination including common household trash, a contraband material used in methamphetamine and opioid addictions, a fibrous product including wet wipes with nylon products, and heavy materials that can cause a typical grinding system to be “jetted” which requires continual maintenance and costly repairs.