Extrusion Tool Sensor Layout for Overload Detection and Profile Quality
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Solution Overview
Problem
Existing extrusion machines face challenges in maintaining a safe and economical operation, producing high-quality profiles, and preventing oxygen absorption during the extrusion process, with limitations in detecting overloads and accessing the friction wheel for maintenance.
Innovation Solution
The extrusion machine incorporates a shielding unit to minimize oxygen access, a sensor system for real-time force measurement and overload detection, and improved accessibility for friction wheel changes through a cantilever arm and guide arrangement, allowing for precise gap control and enhanced operational safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If no shielding unit is provided, then the structure is simpler, but oxygen absorption occurs during heating leading to reduced profile quality
Solution Approach 1:
The patent applies an inert atmosphere principle by introducing a shielding unit that supplies inert gas (such as nitrogen or argon) to the heating zone between the friction wheel and tool unit. This creates an oxygen-free environment that prevents oxidation of the heated extrusion material, thereby maintaining high profile quality without requiring complex additional equipment beyond the gas supply system and nozzles.
2Reliability
If no sensor unit is provided, then the device is simpler, but overload detection is delayed until damage occurs
Solution Approach 1:
The patent implements a feedback principle by installing a sensor unit (such as a load cell or force sensor) between the tool unit and tool holding device that continuously measures the forming force during extrusion. The measured force is fed back to a control system that can detect overload conditions in real-time and trigger alarms or stop the process before damage occurs, enabling preventive maintenance without significantly complicating the overall device structure.
3Ease of repair
If the friction wheel is not accessible, then the structure is more compact, but maintenance and replacement are difficult
Solution Approach 1:
The patent applies segmentation by dividing the drive system into separable modules: the friction wheel is made as an independent removable component that can be detached from the drive shaft without dismantling the entire drive mechanism. The drive shaft remains connected to the drive device while the friction wheel can be quickly replaced by releasing retaining elements, significantly improving maintenance accessibility while maintaining a relatively compact overall structure.
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 solution ensures higher quality profiles by preventing oxygen absorption, enables early detection of potential overloads, and simplifies the friction wheel change process, enhancing operational safety and efficiency.
Implementation Method 1
a shielding unit is provided, the shielding unit comprises at least one first nozzle and at least one second nozzle, the at least one first nozzle and the at least one second nozzle are each designed to emit a gas free of gaseous oxygen in order to minimize or prevent access of ambient air to the heated extruded material
Implementation Method 2
at least one friction wheel rotatable about a drive axis, which friction wheel is provided with at least one circumferential groove and is drive-connected to a drive device
Data Source
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AI summary
The invention relates to an extrusion machine (1) for the continuous production of profiles (2) from a formable extrusion material (3). The extrusion machine (1) comprises a base frame (5), a friction wheel (4) driven by a drive unit (45), a bearing unit (48) with a first bearing device (49) and a second bearing device (50), and a tool holding device (6) with a tool unit (12). Furthermore, it is provided that the tool unit (12) is supported on its side facing away from the friction wheel (4) by means of a first sensor unit (25) on the tool holding device (6), in particular on a first positioning surface (23) of the receiving chamber (22).