Pneumatic Lift Assembly for Web Packaging Die Box
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Solution Overview
Problem
Manual movement of heavy and unwieldy die boxes on web packaging machines for inspection and maintenance is difficult due to accumulated plastic compounds, requiring operators to manually pivot them between operational and maintenance positions, which is labor-intensive and challenging.
Innovation Solution
A lift assembly is introduced that assists manual pivoting of die boxes by applying a lifting force when moving from a lowered to a raised position and a dampening force when moving from a raised to a lowered position, utilizing a pivotally connected bracket and a lift device with a cylinder and piston rod biased by pressurized gas, reducing the operator's effort and facilitating easier movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If operators manually pivot heavy die boxes between operational and maintenance positions, then the die boxes can be moved for inspection and maintenance, but the manual effort required is excessive and operator strain increases
Solution Approach 1:
A lift assembly acts as an intermediary device between the operator and the heavy die box. The lift assembly includes a lift device with a piston rod that connects to a bracket, which in turn connects to the die box. When activated, the piston rod extends or retracts to lift or lower the die box, mediating the heavy lifting task and reducing direct manual effort required by the operator.
Solution Approach 2:
The lift device utilizes pneumatic or hydraulic principles through a cylinder and piston rod mechanism. Pressurized gas or fluid within the cylinder generates force on the piston, causing the piston rod to extend or retract. This pneumatic/hydraulic action provides the lifting force needed to move the heavy die box vertically, significantly reducing the manual effort compared to pure mechanical lifting.
2Ease of operation
If a lift assembly with pneumatic cylinder is added to assist die box movement, then operator effort is reduced, but device complexity increases
Solution Approach 1:
The lift assembly is designed to perform multiple functions: it provides lifting force during die box movement, supports the die box in elevated positions, and can be integrated into the existing machine structure. The bracket serves both as a structural support element and as a connection point for the lift device, allowing one component to fulfill multiple roles and reducing overall system complexity.
Solution Approach 2:
The pneumatic cylinder is designed to automatically extend and retract based on pressure differential, without requiring complex control mechanisms. The system utilizes the existing pressurized gas supply in the packaging machine to power the lift device, allowing it to self-regulate its operation through pressure-driven piston movement rather than requiring separate motors, valves, or control systems.
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
The lift assembly significantly reduces the manual effort required to pivot die boxes, making it easier to inspect and maintain the sealing station by assisting in the movement between operational and maintenance positions, thereby improving operational efficiency and reducing operator strain.
Implementation Method 1
a piston rod that reciprocates in the cylinder into and between a retracted position and an extended position, wherein the piston rod is biased towards the retracted position by pressurized gas contained in the cylinder
Data Source
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AI summary
A web packaging machine (2) for forming a food product package from a lower web of packaging material and an upper web of packaging material includes a frame (6), a web transport conveyor (8) extending along the frame and configured to transport the lower web of packaging material along the frame, and a die box (7) pivotally coupled to the frame and configured to form or close the food product package. A lift assembly (20) is pivotally coupled to the frame and configured to assist manual pivoting of the die box (7) relative to the frame (6).