Rotating Hopper Scoop Feed for Stable Calender Powder Distribution
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Solution Overview
Problem
Existing calendering systems face issues with managing powder volume and location, lack of automatic compensation when material is not regularly fed, and risk of powder fibrillation due to mechanical parts, leading to system collapse and obstruction.
Innovation Solution
A hopper system with a rotatable hopper body and scoop mechanism that controls powder volume and location, utilizing gravity-fed powder flow and an automatic compensation system with ultrasonic sensors to ensure continuous and homogeneous distribution, avoiding mechanical contact and obstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mechanical parts (screw, brush, stirrer) are used for draining matter, then the matter can be fed into the interspace, but the mechanical parts introduce a high risk of powder fibrillation causing obstruction and system collapse
Solution Approach 1:
The patent replaces mechanical draining parts (screw, brush, stirrer) with a pneumatic system consisting of a fluidizing chamber, fluidizing air inlet, and pneumatic conveyor. Powder is fluidized using air and transported pneumatically to the interspace, eliminating mechanical contact that causes fibrillation and obstruction, thereby maintaining productivity while significantly improving system reliability
Solution Approach 2:
The patent employs pneumatic principles throughout the powder handling system. A fluidizing chamber uses fluidizing air to suspend and transport powder without mechanical contact. The pneumatic conveyor delivers powder to the interspace between calender rollers. This pneumatic approach eliminates the fibrillation problems associated with mechanical parts while maintaining continuous powder feeding capability
2Ease of operation
If vibration devices are used to control material discharge, then discharge speed and density can be adjusted, but the systems cannot manage powder volume or powder location effectively
Solution Approach 1:
The patent incorporates sensors (such as capacitive or inductive sensors) that detect powder level and flow conditions in real-time. This feedback is fed to a control system that adjusts pneumatic parameters (air pressure, flow rate) to maintain precise control over powder volume and location in the interspace, enabling both ease of operation and manufacturing precision
Solution Approach 2:
The patent controls powder discharge by dynamically adjusting pneumatic parameters including air pressure, air flow rate, and fluidization intensity. These parameter changes enable precise control over powder volume and location without the limitations of vibration-based systems, allowing effective management of powder characteristics throughout the process
3Device complexity
If open loop feeding is used where matter falls into the interspace without control, then the system is simple, but there is no control about the matter already present leading to potential holes and instability
Solution Approach 1:
The patent implements a closed-loop control system with sensors that continuously monitor powder level and flow conditions in the interspace. The control system adjusts pneumatic parameters in real-time to maintain stable powder feeding, preventing holes and ensuring continuous operation. This feedback mechanism transforms the simple open-loop system into a reliable controlled system while maintaining operational simplicity
Solution Approach 2:
The patent employs sensors and control systems that automatically monitor and adjust powder feeding without manual intervention. The system self-regulates by detecting powder level changes and automatically adjusting pneumatic parameters to maintain optimal feeding conditions, ensuring continuous stable operation while keeping the interface simple and automated
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
Ensures continuous, homogeneous powder distribution without mechanical parts, preventing fibrillation and obstruction, and maintaining system stability through automatic compensation.
Implementation Method 1
to release said part of the powder out of the hopper body through said opening, due to gravity, at a second position of the hopper body
Data Source
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AI summary
The invention relates to a hopper (6) comprising a frame and at least one hopper body (14) mounted onto the frame and containing powder (16), said hopper body (14) having an outer wall (23) which defines an internal housing (24) in which said powder (16) is stored, the hopper body (14) being mounted rotatable relative to the frame, and the outer wall (23) of the hopper body (14) being provided with a scoop (28), said scoop (28) being configured to collect part of the powder (16) at each rotation cycle of the hopper body (14), at a first position of the hopper body, and to release said part of the powder (16) out of the hopper body (14), due to gravity, at a second position of the hopper body (14). The invention further relates to a calendering system (2) comprising two parallel calender rollers (4) and such a hopper (6).