Vertical Shaft Impact Crusher Feed Tube Geometry
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Solution Overview
Problem
Vertical shaft impact crushers face operational disturbances and reduced crushing efficiency due to issues in feeding material to the rotor, leading to stuck materials and inefficient processing.
Innovation Solution
A vertical shaft impact crusher feed tube with a truncated cone shape and a rock bed seat is designed to facilitate controlled material flow, reducing the risk of material sticking and wear, while allowing larger objects to be processed without operational issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If material is fed to the rotor via a conventional feed tube, then the crusher operates, but material gets stuck in the feeding funnel causing operational disturbances and reduced crushing efficiency
Solution Approach 1:
The feed tube geometry is changed from a conventional cylindrical shape to a truncated cone shape with a specific width ratio (1.05-1.15) between inlet and outlet. This parameter change optimizes material flow characteristics, preventing material from getting stuck while maintaining operational stability and improving crushing efficiency.
Solution Approach 2:
The feed tube employs a curved, tapered geometry rather than straight cylindrical sections. The truncated cone shape with smooth curved surfaces guides material flow more effectively, reducing stagnation points and ensuring continuous material movement into the rotor, thereby improving both reliability and productivity.
2Ease of operation
If the feed tube width at the outlet is increased significantly to prevent material sticking, then material flow improves, but control of vertical material flow into the rotor deteriorates
Solution Approach 1:
The width ratio between inlet and outlet is precisely controlled within the range of 1.05-1.15, not exceeding 1.2. This optimized parameter balance ensures sufficient widening to prevent material sticking while maintaining adequate control over vertical material flow into the rotor, avoiding excessive spread and maintaining manufacturing precision.
3Productivity
If more material is fed to the rotor to increase throughput, then productivity increases, but wear on the rotor and feed tube increases
Solution Approach 1:
The curved truncated cone geometry of the feed tube guides material flow smoothly into the rotor, reducing impact shocks and uneven loading. This improves material throughput while distributing wear more evenly, extending the service life of both the feed tube and rotor components.
Solution Approach 2:
The optimized width ratio and tapered geometry parameters create more efficient material flow patterns, allowing increased throughput without proportionally increasing wear rates. The smooth transitions and controlled flow angles reduce impact forces on rotor blades and feed tube walls.
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
A vertical shaft impact crusher feed tube (34) is adapted for protecting a rotor feeding opening (32) of a feeding funnel (14) of a vertical shaft impact crusher. The feed tube (34) comprises a tube portion (42) via which material may flow from the feeding funnel (14) and vertically downwards into a rotor. The tube portion (42) has a first width (D1) at a material inlet (50), and a second width (D2) at a material outlet (52), wherein the second width (D2) is larger than the first width (D1).