Bulk Material Loading Device with Balanced Reciprocating Knife
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Solution Overview
Problem
Existing automatic loading devices for machines handling bulk materials like fibers and plastics face issues such as limited cutting speed, mechanical complexity, and fragility, as well as difficulties in handling and accumulation of materials, leading to inefficiencies and hazards.
Innovation Solution
An improved loading device with a balanced knife mechanism driven by a crankshaft and counterweight for increased cutting speed, combined with a hopper and driving system featuring movable plates and programmable control, along with adjustable components like removable segments and projecting elements, to enhance material handling and prevent blockages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a knife is used to cut material to delimit the top face and adjust thickness, then the strip of material can be properly formed, but the cutting speed is limited and loading effectiveness is reduced
Solution Approach 1:
The blade is divided into multiple removable segments that can be independently replaced. This segmentation allows for optimized blade design where each segment can be precisely engineered for cutting performance while maintaining high cutting speeds, resolving the contradiction between precision and speed by allowing rapid replacement rather than requiring slow, careful handling of a single large blade.
Solution Approach 2:
The knife implements an alternating reciprocating movement rather than continuous rotation, with the blade moving forward to cut and then retracting. This dynamic motion pattern allows the cutting edge to engage the material only during the forward stroke at high speed, while the return stroke can be slower, thereby achieving both high cutting effectiveness and maintained productivity.
2Extent of automation
If projecting elements are used to drive material through the opening, then material can be automatically fed, but the elements may lock in their cavities when material is introduced
Solution Approach 1:
Instead of having the projecting elements extend forward into the material flow path where they risk locking, the design inverts the approach by having the projecting elements retract below the belt level when arriving at the end. This reversal of the extension/retraction timing prevents material from entering the cavities during the vulnerable phase, eliminating the locking problem while maintaining automated feeding.
Solution Approach 2:
The system incorporates a fixed comb disposed above the blade that prevents material from following the blade's alternating movement. This protective element acts as a cushioning measure beforehand, stopping material before it can enter and lock the projecting elements in their cavities, thereby maintaining reliability of the automated feeding mechanism.
3Extent of automation
If a complex retracting mechanism is used for the projecting elements, then automation can be achieved, but the mechanism becomes fragile and complex
Solution Approach 1:
The projecting elements are designed to be automatically retracted by the motion of the endless conveyor belt itself, rather than requiring a separate complex retracting mechanism. As the belt moves, the elements naturally follow the belt's motion and retract below level at the end. This self-service approach achieves automation while minimizing mechanical complexity and fragility.
Solution Approach 2:
The retracting function is merged with the primary conveyor belt motion. The same mechanical system that drives the material forward also automatically retracts the projecting elements by carrying them through the cycle. This consolidation eliminates the need for separate retracting mechanisms, reducing overall device complexity while maintaining full automation.
4Manufacturing precision
If the blade moves in alternating movement perpendicular to driving direction, then cutting can be performed, but the movement requires balancing to increase speed and efficacy
Solution Approach 1:
A counterweight is fixed to the rotary shaft that drives the blade's alternating movement. This counterweight balances the reciprocating blade, reducing vibrations and mechanical stresses that would limit operating speed. By providing dynamic balance, the system can operate the blade at higher speeds while maintaining cutting accuracy, thus resolving the contradiction between precision and productivity.
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 faster and more efficient loading with reduced risk of blockages and material accumulation, improving the overall efficacy of the loading process while allowing adaptation to different materials and easy maintenance.
Implementation Method 1
a balancing device preferably having a counterweight fixed to the said rotary shaft
Implementation Method 2
the said blade is connected to a control link driven by means of a crankshaft fixed to a rotary shaft
Implementation Method 3
the projecting elements of at least one movable plate drive towards the said opening a quantity of material when it moves in this direction
Data Source
AI summary
The invention relates to a device 1 for loading machines handling bulk materials, in particular materials that may be in baled or balled form, such as fibres, yarns, threads or debris from woven or non-woven or plastic textile products. Said device 1 comprises: a hopper 8; a conveying device placed on the base of said hopper 8, to convey a strip of material 3 in a backward conveying direction 4 through an opening 14 and into a machine to be loaded; a knife 15 having a blade 17 that can undergo a reciprocating movement approximately perpendicular to the conveying direction 4 so as to cut the material conveyed into the opening 14; and a device for balancing the reciprocating movement of said blade 17.