Briquetting Machine Pre-Extrusion Release Area for Soft Metal Scrap
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Solution Overview
Problem
Existing loose metal scrap briquetting machines face issues with sharp increases in hydraulic pressure and safety hazards due to the easy formation of dense metal cakes, leading to reduced efficiency, equipment damage, and potential safety risks during the processing of soft metal materials like copper rice.
Innovation Solution
A briquetting machine with a pre-extruding release area, a re-extruding cavity with a top and side gap, and a travel switch that allows step-by-step feeding and reset loading, ensuring timely stress release and proper material density, preventing overpressure and equipment damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a relatively close fit is designed at the junction among the pre-extruding cavity, secondary extruding cavity and final pressing cavity to shear off brittle ferrous metal curls, then manufacturing precision is improved, but for soft metal materials like copper rice, this causes sharp increase of extrusion force and potential safety hazards
Solution Approach 1:
The patent divides the extruding cavity into multiple sections (pre-extruding cavity, secondary extruding cavity, and final pressing cavity) with progressively smaller gaps. This segmentation allows the material to be compressed in stages, preventing sudden pressure spikes while maintaining high compression ratio. The gradual transition from larger to smaller gaps distributes the compressive force over time and space.
Solution Approach 2:
The patent changes the gap parameter progressively through different cavities. The pre-extruding cavity has larger gaps for initial feeding, the secondary extruding cavity has medium gaps for intermediate compression, and the final pressing cavity has small gaps for high-density compaction. This parameter progression resolves the contradiction by allowing high compression ratio while preventing pressure surges through controlled gap reduction.
2Manufacturing precision
If small gaps are used at the junction among cavities to achieve high compression ratio, then manufacturing precision is improved, but this leads to frequent blockages requiring virtual travels that reduce productivity
Solution Approach 1:
By segmenting the compression process into three cavities with progressively smaller gaps, the patent eliminates the need for virtual travels. Each cavity handles a specific stage of compression, ensuring smooth material flow and continuous operation. The staged approach prevents blockages by avoiding sudden transitions from large to small gaps.
Solution Approach 2:
The pre-extruding cavity performs preliminary compression with larger gaps before material enters the secondary and final pressing cavities. This preliminary action prepares the material for subsequent compression stages, preventing blockages in advance and ensuring continuous high-speed operation without interruptions.
3Manufacturing precision
If a close fit is designed among cavities to shear materials, then manufacturing precision is improved, but this causes complex extrusion forces that easily form dense copper cakes and increase extrusion force
Solution Approach 1:
The patent segments the extrusion process into three distinct cavities, each applying compression force in a controlled manner. The pre-extruding cavity applies initial force with larger gaps, the secondary extruding cavity applies intermediate force with medium gaps, and the final pressing cavity applies maximum force with small gaps. This segmentation distributes the total extrusion force over three stages, preventing sudden force spikes.
Solution Approach 2:
The patent creates a dynamic compression process where the gap size changes progressively through the three cavities. This dynamic approach allows the extrusion force to build gradually rather than applied suddenly, matching the material's compression needs at each stage and preventing excessive force generation.
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
Ensures continuous, automatic, and reliable briquetting operations, enhancing equipment safety and efficiency while avoiding dense metal cake formation, thus improving reliability and reducing manual intervention and economic benefits.
Implementation Method 1
the scrap briquetting machine is used to extrude various loose-density ferrous or non-ferrous metal blocks, cutting curls, scraps, etc. into the dense-density cakes under the action of the hydraulic punch
Implementation Method 2
under the action of the hydraulic punch so as to facilitate transportation and storage
Data Source
AI summary
A briquetting machine for loose metal scraps comprises a pre-extrusion part, a re-extrusion part and a final pressing part. On the upper portion of a pre-extrusion cavity (14) of the pre-extrusion part, a pre-extrusion releasing area (15) is formed near to one side of a re-extrusion cavity (24). At the front end of a re-extrusion plunger (23) of the re-extrusion part, a lateral gap (28) is formed near to one side of the pre-extrusion cavity. The cross section of the lateral gap is a right-angled trapezoid and the lateral gap is provided with a lateral slope (29). A briquetting method for loose metal scrapes is disclosed. By way of pre-extrusion and step-by-step feeding and triggering resetting loading, not only is a certain pre-pressing effect guaranteed while the loose metal scraps are processed in each feeding and pre-pressing step, but also the stress can be transferred and released timely under the over-pressure condition, which avoids the formation of dense metal block under the over-pressure condition. Therefore a continuous, automatic and safe pressing operation is assured.