Preform Feeder Blocking Device Pneumatic Integration
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Solution Overview
Problem
Current stretch blow molding technologies face challenges in reliably stopping the transport of plastic preforms at high machine speeds, leading to deformation or damage due to the blocking finger's slow reaction time and limited range of movement, which impairs production efficiency and requires manual intervention.
Innovation Solution
A feeder device with a pneumatically actuable blocking device, where the cylinder and valve are closely integrated to minimize pneumatic connection length, allowing quicker reaction times and precise control, and the blocking device is strategically positioned between preform body sections to create a larger gap for insertion, enabling accurate and failure-free machine restart.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a blocking finger is used to stop preform transport, then the transport path can be blocked, but at high machine speeds the blocking finger is too slow to insert properly between preform mouths, causing deformation or damage
Solution Approach 1:
The blocking device is repositioned from the traditional location at the preform mouths to a new location at the preform body section. This spatial dimension change allows the blocking finger to insert between preform bodies where there is sufficient clearance, avoiding the speed-related insertion problems at the narrower mouth region while maintaining effective transport blocking.
Solution Approach 2:
Instead of blocking at the critical mouth region, the invention creates a duplicate blocking function at the preform body section. The blocking finger replicates the transport interruption capability at a location with more favorable geometric characteristics, achieving the same functional result without the speed-related insertion issues.
2Reliability
If the blocking finger is positioned at the preform mouths, then it can effectively stop transport, but the range of movement is limited and insertion time is insufficient at high speeds
Solution Approach 1:
The blocking operation is relocated from the time-critical mouth region to the spatially advantageous body section. This dimensional shift in blocking location provides adequate insertion time even at high machine speeds, as the larger gap at the body section allows for slower, more controlled finger insertion.
3Productivity
If feeder rails are arranged in an inclined position, then preforms glide due to gravity, but relatively long feeder rails are required to generate sufficient dynamic pressure to counteract friction at high production capacities
Solution Approach 1:
The function of generating dynamic pressure is extracted from the feeder rail itself and transferred to a dedicated pneumatic actuation system. The cylinder and valve assembly directly applies force to the preforms, eliminating the need for long inclined rails to generate sufficient gravitational dynamic pressure, thus enabling high productivity with shorter feeder rails.
4Speed
If the cylinder and valve are arranged far apart, then pneumatic connection length is long causing slow reaction time, but integrating them closely minimizes connection length and enhances reaction speed
Solution Approach 1:
The cylinder and valve are merged into a closely integrated assembly, minimizing the pneumatic connection length between them. This consolidation reduces the overall system response time by eliminating long pneumatic lines and associated delays, enabling rapid blocking device actuation while maintaining manageable structural complexity through functional integration.
Data Source
AI summary
A device for transporting plastic preforms to a stretch blow molding machine comprising a feeder device, which transports the plastic preforms to a separating device, which is arranged in transport direction upstream of the stretch blow molding machine, wherein the feeder device comprises a pneumatically actuable blocking device, which in a first position deblocks the path of transport for the preforms and in a second position blocks the path of transport for the plastic preforms, and wherein the blocking device is actuable by means of a cylinder. According to the invention, the valve for controlling the cylinder is arranged in the immediate vicinity of the cylinder.