Screw Machine Housing Slide Connection for Thermal Expansion
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Solution Overview
Problem
Existing screw machines face challenges in compensating for the thermal expansion of the housing, which requires complex multi-ball bearings for the gear and motor to absorb axial expansion, making it difficult to maintain a defined position between the gear and housing.
Innovation Solution
A slide connection is arranged between the housing and the gear, featuring an adapter with a screw bore portion connected to the housing and a bearing portion facing the gear, allowing for thermal expansion compensation directly before the supply end, while providing reciprocal support perpendicular to the longitudinal axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a slide connection is arranged at the discharge end to compensate thermal expansion, then the housing expansion is compensated, but the discharge end cannot be fixed in the longitudinal direction
Solution Approach 1:
The housing is divided into a fixed portion (discharge end) and a movable portion (supply end). The slide connection is arranged in the supply end portion, allowing this segment to move independently to compensate for thermal expansion while the discharge end remains fixed.
Solution Approach 2:
A slide connection mechanism acts as an intermediary element between the fixed discharge end and the movable supply end. This intermediary allows controlled movement to absorb thermal expansion while maintaining the fixed position of the discharge end.
2Adaptability or versatility
If complex multi-ball bearings are used for the gear and motor to absorb axial expansion, then the housing expansion is compensated, but the device complexity increases
Solution Approach 1:
The slide connection is extracted from the gear and motor assembly and relocated to the housing at the supply end. This extraction simplifies the bearing system by removing the need for complex multi-ball bearings while still achieving thermal expansion compensation.
Solution Approach 2:
Instead of using complex bearings to absorb expansion, a simpler slide connection mechanism is used as a substitute. The slide connection provides the necessary movement to absorb thermal expansion with significantly reduced mechanical complexity.
3Adaptability or versatility
If a gap is provided between the housing and gear to allow thermal expansion, then the housing can expand, but a defined position between gear and housing cannot be achieved
Solution Approach 1:
The slide connection introduces a dynamic element that allows controlled movement between the housing and gear. This dynamic mechanism maintains a defined positional relationship while still permitting thermal expansion through the sliding motion of the connection.
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 allows for simple compensation of longitudinal housing expansions and maintains a defined position between the housing and gear, reducing the complexity of thermal expansion management.
Implementation Method 1
Screw machines of this type are heated, in particular when starting up, from room temperature to a very high operating temperature, generally of between 200° C. and 300° C., so both the respective housing and the respective screw shaft or, in the case of multi-shaft machines, the screw shafts, expand in the longitudinal direction.
Data Source
AI summary
A screw machine, in particular an extruder, has a housing which has a supply opening at a supply end. At least one bore with a longitudinal axis is provided, in which a screw shaft is rotatably arranged. The drive takes place by means of a drive motor using a gear, the output shaft of which has a rotary drive connection to the screw shaft. Provided between the housing and the gear is a slide connection, which allows a displacement of the housing relative to the gear in the direction of the longitudinal axis.