Injection Piston Carriage Alignment for Moulding Machine Removal
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Solution Overview
Problem
The existing methods for removing and installing injection pistons in molding machines are inefficient, often requiring significant manual effort and risk of damage due to the need for non-aligned pulling or pushing forces, especially given the large size and weight of the pistons.
Innovation Solution
A device comprising a lifting table with a movable carriage and drive mechanism, including a toothed pinion and rack system, allows for the injection piston to be easily installed or removed along its longitudinal axis, reducing the effort required and minimizing the risk of jamming or deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a transport crane is used to remove the injection piston, then the piston can be lifted, but the crane cannot exert a horizontal traction force along the piston's longitudinal axis
Solution Approach 1:
A carriage system acts as an intermediary between the lifting table and the injection piston. The carriage can move horizontally along the lifting table and is equipped with a pulling mechanism that applies force directly along the piston's longitudinal axis, enabling proper alignment during removal without requiring the crane to provide horizontal force
2Productivity
If the injection piston is pulled with a force not coincident with its longitudinal axis, then removal may proceed, but blockages and jamming occur
Solution Approach 1:
The carriage system provides dynamic positioning and movement capabilities, allowing the pulling force to be continuously adjusted to remain aligned with the piston's longitudinal axis throughout the removal process. This dynamic alignment prevents blockages and jamming while maintaining efficient removal speed
3Ease of operation
If manual effort is used to move the heavy piston, then installation may be completed, but significant effort and risk of damage occur
Solution Approach 1:
The lifting table provides a counterbalancing support system that carries the weight of the heavy injection piston (around 250 kg). This allows operators to manipulate and position the piston with minimal effort, as the lifting table counteracts the gravitational force, eliminating the need for manual lifting while maintaining ease of operation
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 device enables safe and efficient installation and removal of injection pistons by exerting a push or pull force along the piston's axis, reducing the effort needed by 10 times and preventing jamming or deformation, thus simplifying the process without additional manual effort.
Implementation Method 1
the carriage drive means are in the form of a toothed pinion meshing in a rack as complementary drive means carried by the lifting table
Implementation Method 2
a reduction member being operational between the first flywheel and the toothed pinion. The reducer with a ratio of 1/10 makes it possible to reduce the effort of pushing and pulling
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention concerns a device (1) for installing an injection piston (2) in or removing same from a moulding machine (3). The device (1) comprises a lift table (4) supporting an attachment system (5) for attaching one end (2a) of the injection piston (2). The attachment system (5) is mounted on a carriage (6) that is movable in translation on the lift table (4) in two opposing directions. The movable carriage (6) has drive means cooperating with complementary drive means carried by the lift table (4), the drive means of the movable carriage (6) being operated by means of an operator acting on actuation means (9) for actuating said drive means. The invention is useful in the field of moulding machines with injection pistons.