Vertical Mill Hopper Pipe Positioning
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Solution Overview
Problem
The hopper in vertical-type mills is prone to abrasion and coarse particle deposition due to the misalignment of the raw material feeding pipe, leading to maintenance challenges and efficiency issues.
Innovation Solution
The raw material feeding pipe is positioned within the hopper to satisfy the relation 0.15≦L′/L≦0.5, where L′ is the distance from the reference position to the pipe's bottom end, and the hopper is designed as a divided structure for improved maintainability, allowing for easier assembly and disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the bottom end position of the raw material feeding pipe is made close to the reference position to prevent hopper abrasion, then the hopper abrasion is reduced, but the gap between the raw material feeding pipe and the hopper narrows causing coarse particle deposition
Solution Approach 1:
The invention changes the positional parameter of the raw material feeding pipe by defining a specific distance range (0.05L ≤ L′ ≤ 0.3L) from the reference position. This parameter optimization simultaneously prevents hopper abrasion by maintaining adequate distance while avoiding coarse particle deposition by not being too far, thus resolving the contradiction between the two harmful effects.
2Object-generated harmful factors
If the bottom end position of the raw material feeding pipe is kept away from the hopper to prevent coarse particle deposition, then coarse particle deposition is reduced, but the hopper may be abraded
Solution Approach 1:
The invention establishes an optimal parameter range (0.05L ≤ L′ ≤ 0.3L) for the distance L′ between the raw material feeding pipe bottom end and the reference position. This parameter setting prevents coarse particle deposition by maintaining sufficient gap while avoiding excessive distance that would cause hopper abrasion, thus resolving the contradiction.
3Ease of repair
If the hopper is designed as a divided structure for improved maintainability, then maintenance complexity is reduced, but device complexity increases
Solution Approach 1:
The hopper is divided into multiple sections (first hopper section and second hopper section) along its height. This segmentation allows independent maintenance of each section, reducing overall maintenance complexity. The divided structure enables easier access and repair operations while the sections can be reassembled to form the complete hopper, thus resolving the contradiction between maintainability and structural complexity.
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 configuration prevents hopper abrasion and coarse particle deposition, enhancing the mill's operational efficiency and maintainability by ensuring the hopper remains functional and reducing maintenance complexity.
Implementation Method 1
the raw material falling down onto the milling table moves on the milling table toward the outer peripheral portion thereof while drawing a spiral locus due to centrifugal force caused by the rotation
Implementation Method 2
Coarse particles larger than a predetermined particle size fall down into the recovery cone
Data Source
AI summary
Provided is a vertical-type mill whereby abrasion of a hopper and accumulation of coarse particles in the hopper can both be prevented. A vertical-type mill provided with a milling mechanism for milling a material to be milled and obtaining solid particles by meshing of a milling roller or milling ball and a milling table, a classification mechanism having a classifier for classifying milled solid particles and a hopper (11) for collecting coarse particles that are classified by the classifier and dropped downward and leading the coarse particles toward the milling mechanism, a raw material feeding pipe (1) for charging the material to be milled into the milling table, and housings (43a, b), wherein the raw material feeding pipe is provided in the hopper so that the relationship 0.15≦L′/L≦0.5 is satisfied, where, using the boundary line between a cylindrical part of the hopper and an inverted conical part of the hopper as a reference position, L is the distance from the reference position to the top end of the hopper, and L′ is the distance from the reference position to the bottom end (1a) of the raw material feeding pipe.