Decoupled Drive Transport for Plastic Preform Heating
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Solution Overview
Problem
Existing devices for forming plastic preforms into containers face high costs and limited flexibility due to complex pneumatic systems and parameterization requirements for synchronous transfer, leading to inefficiencies and increased susceptibility to failures.
Innovation Solution
The implementation of independently controlled drive devices for the transport and heating systems, allowing for decoupling of the feed device and oven drives, eliminating the need for a preform lock and enabling a more flexible and reliable operation with reduced material and personnel costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pneumatic systems and synchronous transfer mechanisms are used to control preform transport, then reliable transfer of plastic preforms can be achieved, but device complexity and cost increase significantly
Solution Approach 1:
The patent removes the preform lock component entirely from the system. By using a sawtooth starwheel with asymmetric teeth that naturally engage and release preforms during rotation, the complex pneumatic locking mechanism is eliminated while maintaining reliable transfer functionality.
Solution Approach 2:
The sawtooth starwheel design allows the preforms to be automatically engaged and transferred without external control systems. The asymmetric tooth geometry creates natural engagement points that guide preforms through the heating process and back to the feed rail, eliminating the need for pneumatic cylinders and digital control modules.
2Ease of operation
If pneumatic cylinders and digital output modules are used to control dynamic motion of preform lock and feed rail, then precise control can be achieved, but costs increase correspondingly
Solution Approach 1:
The patent eliminates pneumatic cylinders, valves, and digital output modules by replacing them with a mechanically self-regulating sawtooth starwheel system. The asymmetric tooth design provides inherent motion control without requiring external actuators or electronic control systems.
Solution Approach 2:
The patent replaces the pneumatic-mechanical control system with a purely mechanical passive system. The sawtooth starwheel's geometry inherently controls the timing and position of preform transfer, substituting complex pneumatic actuation with simple mechanical engagement.
3Reliability
If parameterization of preform lock is adjusted for reliable synchronous transfer, then transfer reliability improves, but adaptability to different production speeds and preform types is limited
Solution Approach 1:
The sawtooth starwheel is designed with adjustable rotational speed capability, allowing the system to adapt to different production rates. The asymmetric tooth geometry maintains reliable preform engagement across a range of speeds, providing both reliability and adaptability without requiring parameter reconfiguration.
Solution Approach 2:
The system allows for adjustment of the starwheel's rotational parameters and tooth geometry to accommodate different preform types and production speeds. This flexibility enables the same basic mechanism to reliably handle various production conditions without requiring complete reparameterization.
4Reliability
If a movable feed rail part is used to prevent preform jamming, then jam prevention capability is achieved, but device complexity and susceptibility to failure increase
Solution Approach 1:
The patent removes the movable feed rail component and associated sensors that detect jamming conditions. The sawtooth starwheel's design inherently prevents jamming by ensuring proper preform orientation and spacing through its asymmetric tooth engagement, eliminating the need for movable compensation mechanisms.
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 enhances machine efficiency, reduces energy consumption, and allows for flexible production settings, including low-output operations without thermal overloading, by synchronizing only the necessary components and using servo drive technology for precise control.
Implementation Method 1
plastic preforms are first heated in a heating device, such as, in particular but not exclusively, an infrared oven
Data Source
Figure 1
AI summary
A device (1) for forming plastic preforms (10) into plastic containers (20) with a transport device (2) which transports the plastic preforms (10) along a predetermined transport path, wherein this transport device (2) has a plurality of preferably adjoining transport units (22, 24, 25, 26) for transporting the plastic preforms, with a heating device (4) which heats the plastic preforms (10) and with a forming device (6) which is arranged along the transport path of the plastic preforms (10) after the heating device (2), wherein the device (1) has a first transport unit (22) which feeds the plastic preforms individually to the heating device, wherein the heating device (4) has a second transport unit (24) which transports the plastic preforms during their heating.According to the invention, the first transport device (22) has a first drive device (32) and the second transport device (24) has a second drive device (34) and the first drive device (32) and the second drive device (34) are controllable independently of each other.