Preliminary Crusher Pressure Element Dynamics for Scrap Handling
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Solution Overview
Problem
Existing preliminary crushing devices in garbage disposal plants struggle to efficiently crush scrap materials, especially when they are packed, leading to reduced production capacity, increased energy consumption, and safety risks due to manual intervention required for blockages.
Innovation Solution
A preliminary crushing device with a movable pressure element that adjusts its position to accommodate different scrap sizes, featuring counter-rotating rollers with independent motor control and hook elements to manage blockages and ensure continuous feeding, reducing the likelihood of 'floating' scrap and enhancing grip and crushing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the distance between the toothed profile of the first roller and the surface of the oscillating wall is reduced, then the attachment and drawing action on scrap is improved, but the device cannot accommodate larger packed scrap and requires manual intervention
Solution Approach 1:
The oscillating wall is made mobile between a first position aligned with the slide and a second position where it rotates to move its upper portion toward the crushing rollers. This dynamic adjustment allows the device to adapt to different scrap sizes while maintaining effective crushing action
Solution Approach 2:
Hooked portions are added to the oscillating wall surface facing the crushing rollers. These hooks act as intermediaries to improve the attachment and drawing action on scrap, enabling the wall to grip and guide packed scrap into the crushing zone without requiring manual intervention
2Adaptability or versatility
If manual intervention is required for blockages, then the device can handle difficult scrap, but safety risks increase and operational efficiency decreases
Solution Approach 1:
The oscillating wall with hooked portions automatically performs the function of guiding and rendering scrap that causes blockages. The system serves itself by using the oscillating wall's movement and hooks to push scrap back and render it, eliminating the need for manual intervention and associated safety risks
Solution Approach 2:
The oscillating wall moves alternately between its first and second positions for a predetermined interval when blockage is detected. This periodic oscillating motion continuously attempts to render the blocking scrap until it passes through the rollers, providing automatic handling of difficult cases
3Ease of operation
If the oscillating wall is positioned to allow scrap advance, then feeding is smooth, but the wall cannot exert additional rending action on blocking scrap
Solution Approach 1:
The oscillating wall dynamically changes position based on operational needs. During normal feeding, it remains in the first position aligned with the slide for smooth scrap advance. When blockage occurs, it rotates to the second position to exert rending action on the blocking scrap through its hooked portions
4Productivity
If the crushing rollers are made to counter-rotate at different speeds, then the toothed profiles can draw scrap effectively, but packed scrap may float without proper attachment
Solution Approach 1:
Hooked portions are provided on the oscillating wall to act as intermediaries that improve attachment to scrap, particularly packed scrap. These hooks engage with the scrap surface and guide it into the crushing zone between the rollers, preventing floating and ensuring reliable attachment
Solution Approach 2:
The hooked portions add a new dimensional aspect to the interaction between the oscillating wall and scrap. Instead of relying solely on the toothed profiles of the rollers for attachment, the hooks provide an additional attachment mechanism that operates in a different spatial dimension, improving grip on packed materials
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 solution enables efficient crushing of both loose and packed scrap materials, increasing plant productivity while reducing energy consumption and minimizing manual intervention, thus enhancing safety and operational efficiency.
Implementation Method 1
an introduction slide (27), having a predetermined inclination such to allow the scrap (13) fed into the introduction aperture (23) to slide due to gravity
Implementation Method 2
a compression element (30) selectively mobile between at least a first position (Fig. 4), or inactive position, in which it is disposed substantially aligned with the introduction slide (27)... and a second position (Fig. 5) in which it protrudes forward with respect to the introduction slide (27)
Implementation Method 3
a crushing unit (50), having an upper crushing roller (52) and a lower crushing roller (54), in turn provided with toothed crowns (58) for crushing, suitable to counter-rotate alternately, at different speeds, between a first direction of rotation in order to feed and crush the scrap (13) between the rollers (52, 54)
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Device for the preliminary crushing of scrap, comprising conveying means (22) and crushing means (50) disposed at a predetermined operating distance from the conveying means (22). The conveying means (22) comprise an introduction portion (27) and a pressure element (30), disposed immediately after the introduction portion (27), provided with hook portions (40) able not to interfere with the feed of the scrap toward the crushing means (50). The pressure element (30) is selectively movable between at least a first position, in which it is disposed substantially aligned with the introduction portion (27) and a second position in which it protrudes with respect to the introduction portion (27) so as to bring the hook portions (40) closer to the crushing means (50). The pressure element (30) has at least a third position in which at least it is disposed in a recessed manner with respect to the introduction portion (27), so as to determine a step (28) to increase, at least temporarily, the operating distance between the crushing means (50) and the hook portions (40).