Eccentric Drive Mixing Device With Speed-Dependent Imbalance
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Solution Overview
Problem
Existing mixing devices for containers are complex, bulky, and prone to wear, particularly in bearing components, which affects their reliability and operational efficiency.
Innovation Solution
A compact mixing device design featuring an eccentric drive with a crankshaft and adjustable additional mass parts, elastically braced by a force accumulator and spiral spring, which creates a speed-dependent imbalance for mixing, reducing the need for additional components and enhancing structural simplicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an eccentric drive with additional mass parts is used to create mixing movement, then mixing effectiveness is improved, but device complexity increases
Solution Approach 1:
The patent combines the eccentric drive mechanism with the mixing container by integrating the additional mass parts directly into the container structure. The first and second additional mass parts are positioned at different radial locations on the container, creating differential mixing movements that enhance mixing effectiveness while avoiding separate complex mechanisms
Solution Approach 2:
The additional mass parts are designed to be movable relative to the container, with at least one mass part having a degree of freedom that allows it to move in response to centrifugal forces during rotation. This dynamic positioning enables speed-dependent mass distribution, optimizing mixing effectiveness across different rotational speeds without requiring complex control systems
2Productivity
If multiple additional mass parts are added to the crankshaft, then mixing motion is improved, but the device becomes bulkier and occupies more space
Solution Approach 1:
The patent utilizes the radial dimension of the rotating container by positioning additional mass parts at different radial distances from the rotation axis. This radial distribution allows multiple mass parts to be accommodated within the container's cross-sectional area rather than requiring additional axial or lateral space, maintaining compact device volume while improving mixing motion quality
3Ease of operation
If traditional bearing-supported oscillating frame is used, then mixing movement is achieved, but bearing wear increases and reliability decreases
Solution Approach 1:
The patent replaces the traditional mechanical bearing-supported oscillating frame with a direct rotation-driven system. The mixing container rotates directly on support elements, and the additional mass parts generate mixing movements through their own motion relative to the container rather than through a separate oscillating frame mechanism, eliminating bearing wear issues
Solution Approach 2:
The additional mass parts automatically generate the required mixing movements through their own inertia and relative motion during container rotation. The system uses the rotation itself to create the differential movements needed for mixing, without requiring separate actuation mechanisms or bearing-supported oscillating components
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 results in a cost-effective, reliable, and long-lasting mixing device with fewer components, improved service life, and efficient mixing motion through controlled imbalance, while minimizing noise and wear.
Implementation Method 1
the two mass parts are braced against one another by means of a spiral spring that is guided at least in some areas around the crankshaft as an energy accumulator
Implementation Method 2
the force accumulator holds the mass parts in the additional mass basic position when the crankshaft is at a standstill and all mass parts against the pretensioning force from a defined speed of the crankshaft of the force accumulator are shifted
Implementation Method 3
an eccentric drive having a crankshaft as an eccentric also being provided, by means of which the holding device and thus a held container can be set in a defined oscillation and/or vibration movement as a mixing movement
Implementation Method 4
the at least one additional mass that can be changed as a function of the rotational speed and/or displaced relative to the crankshaft as a function of the rotational speed Mass increasing, the mixing movement of the holding device causing imbalance
Data Source
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AI summary
The invention relates to a mixing device (1) for mixing materials contained in containers, comprising a holding device (3) for receiving and holding at least one container, and an eccentric drive (11) having a crankshaft (14) as an eccentric, by means of which the holding device (3), and thus a container received and held therein, can be set into a defined oscillating and/or vibrating motion as a mixing motion. According to the invention, the crankshaft (14) is provided with at least one additional mass (17) that is variable depending on the rotational speed and/or displaceable relative to the crankshaft (14), which, preferably starting from a base position of the additional mass when the crankshaft (14) is stationary, provides an imbalance that increases to a defined extent with increasing rotational speed of the crankshaft (14), causing the mixing motion of the holding device (3). Furthermore, a method for operating a mixing device (1) is proposed.