Jaw Crusher Dual Eccentric Shaft Linear Stroke
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Solution Overview
Problem
Existing jaw crushers face inefficiencies due to complex designs and space constraints from previous improvements in the movement pattern of the movable jaw, which affect crushing capacity and wear part efficiency.
Innovation Solution
A jaw crusher design featuring a movable jaw with a pitman rotatably mounted to both a first and second eccentric shaft, where the second eccentric shaft has a larger radius than the first, creating a substantially linear crushing stroke and allowing for improved movement patterns with reduced vertical movement, thus optimizing the crushing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the pitman is attached to a pivot bar to improve movement pattern, then the movement pattern becomes a flattened oval, but this requires an undesirable amount of space inside the pitman and crusher frame
Solution Approach 1:
The invention divides the single eccentric shaft into two separate eccentric shafts (first and second eccentric shafts) with different eccentricities. This segmentation allows each shaft to contribute differently to the movement pattern, achieving the desired flattened oval path without requiring excessive space within the pitman and crusher frame structure.
Solution Approach 2:
The invention transitions from a single-dimensional eccentric movement to a two-dimensional compounded movement by introducing a second eccentric shaft. The combination of movements from both shafts creates the flattened oval pattern, effectively utilizing spatial dimensions to achieve the desired movement characteristics without increasing overall volume.
2Ease of operation
If the pitman is attached to a slide member moving perpendicular to the centerline to improve movement pattern, then the movement pattern becomes a flattened oval, but this results in a more complex design requiring careful consideration in lubrication
Solution Approach 1:
The invention replaces the slide member mechanism with a rotational mechanism using two eccentric shafts. Instead of linear sliding motion perpendicular to the centerline, the system uses rotational motion of eccentric shafts to achieve the same flattened oval movement pattern, thereby eliminating the complexity associated with slide members and their lubrication requirements.
Solution Approach 2:
The invention changes the fundamental motion parameter from linear sliding to rotational motion. By using eccentric shafts that rotate, the system achieves the desired movement pattern through rotational kinematics rather than linear sliding, simplifying the overall design and reducing lubrication complexity.
3Ease of manufacture
If the crushing stroke contains upward and downward movement, then the movable jaw can be attached to traditional mechanisms, but this reduces the efficiency of the stroke
Solution Approach 1:
The invention employs asymmetric eccentricities for the two shafts, where the second eccentric shaft has a larger eccentricity than the first. This asymmetry in the mechanical parameters creates a movement pattern where the forward crushing stroke is more effective and directed, while the return stroke is minimized, thereby improving overall crushing efficiency without sacrificing manufacturability.
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 design enhances crushing capacity, reduces wear on wear parts, simplifies the crusher structure, and improves dust sealing, while allowing for easier lubrication and assembly, resulting in increased efficiency and cost savings.
Implementation Method 1
the pitman is rotatably mounted to a first eccentric shaft, and wherein the pitman is further rotatably mounted to second eccentric shaft configured to guide the stroke of the movable jaw to create a movement pattern with a substantially linear crushing stroke
Data Source
AI summary
A jaw crusher, a mineral material processing plant and a method for processing mineral material. The jaw crusher includes a fixed jaw and a movable jaw for forming a crushing chamber therebetween which is open at the top. The fixed jaw includes a first wear part mounted thereto and the movable jaw includes a pitman and a second wear part mounted thereto. The pitman is rotatably mounted to a first eccentric shaft. The pitman is further rotatably mounted to second eccentric shaft configured to guide the stroke of the movable jaw to create a movement pattern with a substantially linear crushing stroke, wherein the eccentricity of the second eccentric shaft is larger than that of the first eccentric shaft.