Blade mill
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Solution Overview
Problem
Knife mills for laboratory use face issues such as light, moist, or oily samples being thrown up and stuck to the container walls, significant volume loss during comminution, difficulty in handling heavy gravity lids, unsuitable operation for temperature-sensitive materials, and complex cleaning due to liquid ingress and component design.
Innovation Solution
A knife mill design featuring a vertically displaceable compressor with a thrust mechanism that applies a gravity-independent axial force, allowing flexible control over compression, easy handling, and cleaning, along with a ventilation device to prevent liquid from reaching the drive shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a gravity lid is used to compress the material, then the material is compressed before and during comminution, but the lid becomes very heavy and difficult to handle
Solution Approach 1:
The patent replaces the gravity-based compression system with a motor-driven compressor that applies compressive force through mechanical means rather than relying on the weight of a heavy lid. The motorized compressor provides the necessary compression force without requiring the operator to manually handle heavy components.
Solution Approach 2:
The patent substitutes the mechanical gravity-based compression system with an electromechanical system. The motor-driven compressor uses electrical power converted to mechanical motion to achieve compression, replacing the need for a heavy gravity lid and manual operation.
2Force
If a gravity lid is used, then compression force is applied to the material, but the force cannot be changed and the lid must be very heavy
Solution Approach 1:
The patent implements a motor-driven compressor that can dynamically adjust the compression force applied to the material. The motor speed and torque can be controlled to vary the compression force, providing adaptability for different material types and comminution requirements, unlike the fixed force of a gravity lid.
Solution Approach 2:
The patent allows for changing the compression force parameter through motor control. By adjusting motor speed, voltage, or mechanical transmission ratios, the compression force can be varied to suit different comminution tasks, providing versatility that a fixed gravity lid cannot achieve.
3Device complexity
If the compressor is pushed down by gravity, then the system is simple, but the compressor cannot be easily removed and cleaned
Solution Approach 1:
The patent designs the motor-driven compressor as a separate, detachable component from the comminution chamber. This segmentation allows the compressor to be easily removed for cleaning and maintenance while keeping the rest of the system intact, addressing the cleaning difficulty without significantly increasing overall system complexity.
4Productivity
If liquid escapes during comminution, then the comminution process continues, but liquid can reach the drive shaft and impair service life
Solution Approach 1:
The patent extracts or removes the drive shaft from the area where liquid can reach it during comminution. By positioning the drive shaft outside the comminution chamber or protecting it with sealed components, the system maintains continuous operation while preventing liquid contact that would reduce service life.
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 design enhances comminution efficiency by reducing sample loss, improves handling and cleaning ease, and allows for temperature-sensitive materials processing while maintaining high comminution capacity.
Implementation Method 1
the thrust mechanism has a spring element which applies the thrust force in the form of spring force to the compressor
Implementation Method 2
The knife comprises a ventilation device, by means of which an overpressure can be generated in the comminution container when the knife rotates in the comminution container
Data Source
Figure 1~3
Figure 4~5
Figure 6~8
AI summary
The invention relates to a blade mill, comprising a grinding container and a compressor, which is displaceable in the grinding container for compressing the grinding material, as well as a cooling device for cooling the grinding container.