Laboratory Mill Feed Plunger for Controlled Grinding Material Flow
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Solution Overview
Problem
Existing laboratory mills face issues with uncontrolled feeding of materials, leading to overfeeding, excessive bending moments on the motor shaft, and material ejection during grinding, which can cause user malfunctions and inefficiencies.
Innovation Solution
A laboratory mill with a material feed hopper and a grinding material filling plunger that allows controlled, continuous feeding of materials into the grinding chamber, using a material feed channel with a spiral design to manage flow and prevent ejection, while being easily maneuverable by the user.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a compression plunger is used to force material into the grinding chamber, then material feeding is improved, but excessive bending forces on the motor shaft and excessive pressure on the sample occur
Solution Approach 1:
The plunger geometry is changed from a solid cylindrical shape to a hollow tube shape, fundamentally altering its mechanical properties. This parameter change allows the plunger to flex and compress under load rather than transmitting rigid forces, thereby reducing bending moments on the motor shaft while still enabling effective material feeding into the grinding chamber
Solution Approach 2:
The plunger is designed with a hollow internal structure rather than being solid, segmenting its mass distribution. This segmentation reduces the overall mass and moment of inertia of the plunger, allowing it to respond more dynamically to grinding chamber conditions and reduce excessive forces on the drive system
2Productivity
If a compression plunger is used to force material into the grinding chamber, then material feeding is improved, but excessive pressure on the sample occurs
Solution Approach 1:
The plunger geometry is changed from a solid cylindrical shape to a hollow tube shape, fundamentally altering its mechanical properties. This parameter change allows the plunger to flex and compress under load rather than transmitting rigid forces, thereby reducing bending moments on the motor shaft while still enabling effective material feeding into the grinding chamber
Solution Approach 2:
The plunger is designed with a hollow internal structure rather than being solid, segmenting its mass distribution. This segmentation reduces the overall mass and moment of inertia of the plunger, allowing it to respond more dynamically to grinding chamber conditions and reduce excessive forces on the drive system
3Productivity
If material is added to the hopper during rotor rotation, then continuous grinding is maintained, but material can jump out of the hopper causing user malfunctions
Solution Approach 1:
The hollow plunger acts as an intermediary device between the hopper and the grinding chamber. It controls material flow through its hollow structure, allowing material to be fed continuously while preventing uncontrolled ejection. The plunger mediates between the need for continuous feeding and the need to prevent material from jumping out during rotor rotation
4Productivity
If a solid cylindrical plunger is used, then material can be forced into the grinding chamber, but the plunger cannot be easily maneuvered by the user
Solution Approach 1:
The plunger geometry is changed from a solid cylindrical shape to a hollow tube shape, fundamentally altering its mechanical properties. This parameter change allows the plunger to flex and compress under load rather than transmitting rigid forces, thereby reducing bending moments on the motor shaft while still enabling effective material feeding into the grinding chamber
Solution Approach 2:
The plunger is designed with a hollow internal structure rather than being solid, segmenting its mass distribution. This segmentation reduces the overall mass and moment of inertia of the plunger, allowing it to respond more dynamically to grinding chamber conditions and reduce excessive forces on the drive system
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
Enables safe, controlled, and continuous feeding of materials, reducing overfeeding and material ejection, thereby minimizing wear on the motor shaft and ensuring consistent grinding performance.
Implementation Method 1
The material feed channel (50) allows grinding material to trickle down through it into the grinding chamber (18) when the grinding material filling plunger (40) is in the axial end position in the grinding material filling hopper (28)
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
The invention relates to a laboratory mill for grinding materials, in particular designed as a cutting mill, impact mill, disc mill, knife mill, impact mill, centrifugal mill, rotor mill, rotor high-speed mill or mortar mill, comprising: a grinding mechanism (4) with a grinding mechanism housing (6) which defines a grinding chamber (18), and with a grinding mechanism rotor (16) which is rotatably driven in the grinding chamber (18) to grind the material in the grinding chamber (18) with the grinding mechanism rotor (16), wherein the grinding mechanism housing (6) has a material feed opening (26) which leads into the grinding chamber (18) in order to introduce the material from the outside through the material feed opening (26) into the grinding chamber (18), a drive motor for driving the grinding mechanism rotor in the grinding chamber (18), a material feed hopper (28) which has a material feed cone (30) and a hopper neck (32) exhibitswherein the grinding material feed hopper (28) is attached to the laboratory mill and the hopper neck (32) opens into the grinding material feed opening (26), such that the grinding material can be filled into the grinding material feed cone (30) and passes through the hopper neck (32) and the grinding material feed opening (26) into the grinding chamber (18) while the mill rotor (16) rotates in the grinding chamber, a grinding material feed plunger (40) that can be inserted into the grinding material feed hopper (28), wherein the grinding material feed plunger (40) has a grinding material feed channel (50) through which the grinding material can be filled into the grinding chamber (18) when the grinding material feed plunger (40) is inserted into the hopper neck (32).