Asynchronous Braking for Tobacco Cutting Device Collision Prevention
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Solution Overview
Problem
Existing cutting devices in the tobacco processing industry face a high risk of collision between knives and tubes during shutdown or fault conditions, leading to operational failures and malfunctions.
Innovation Solution
A control system that generates a switch-off signal to initiate an asynchronous braking operation, ensuring that at least one of the carriers is rotated into a predetermined stop position outside the common cutting positions of the knife and tube, decoupling them quickly to prevent collisions, using a rotational difference and auxiliary power supply for efficient decoupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If direct rotary drives with individual electrical control are used for blade carrier and tube carrier, then synchronous operation can be controlled and productivity is improved, but the risk of collision between knives and tubes increases during shutdown or fault conditions
Solution Approach 1:
The control device is configured to detect shutdown or fault conditions and automatically initiate a collision-preventing braking sequence before actual collision can occur. The system applies brake forces to carriers in a predetermined sequence that ensures knives and tubes are positioned away from each other's paths during deceleration, thereby preventing collisions that would otherwise occur during uncontrolled shutdown.
2Reliability
If tubes and knives are provided with predetermined breaking points for collision protection, then safety is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent replaces passive mechanical collision protection (breaking points in tubes and knives) with an active control system that uses electrical signals and controlled braking to prevent collisions. The control device monitors carrier positions and triggers braking sequences electronically, eliminating the need for structural weak points in the cutting components themselves.
3Reliability
If asynchronous braking is implemented to prevent collisions during shutdown, then reliability is improved, but control complexity and energy requirements increase
Solution Approach 1:
The control device is pre-programmed with braking sequences that are automatically executed upon detection of shutdown conditions. The system calculates and applies appropriate brake forces to carriers in a predetermined sequence that guarantees collision-free stopping, eliminating the need for complex real-time calculations during actual shutdown events.
4Reliability
If one carrier is braked faster than the other during asynchronous braking, then collision prevention is improved, but the braking time and energy consumption increase
Solution Approach 1:
The control system dynamically adjusts brake forces applied to different carriers based on their current positions, speeds, and masses. The system continuously monitors carrier states during braking and modulates brake intensity to optimize the stopping sequence, achieving collision-free shutdown in minimal time while accounting for the different inertial properties of the blade and tube carriers.
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
This solution effectively prevents collisions during shutdown or fault conditions by ensuring the knife and tube carriers are decoupled in a collision-free manner, allowing for safe and efficient stopping within a short time frame, even with a temporary auxiliary power supply.
Implementation Method 1
direct rotary drives for the blade carrier and the tube carrier, formed by electric motors fixed to the frame
Implementation Method 2
asynchronous braking operation in such a way that at least one of the two carriers (tube carrier or knife carrier) is rotated into a predetermined stop position
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A cutting device (1) for the tobacco processing industry, used to cut at least one conveyed strand (9) into a plurality of rod-shaped articles, comprises a knife carrier (20) and a tube carrier (30), as well as a control unit (8). The control unit (8) is configured and connected to rotary drives (4, 5) of the carriers (20, 30) such that it generates a shutdown signal and initiates and executes a defined asynchronous braking operation for the controlled shutdown of the cutting device (1) operating in synchronous cutting mode. At least one (30) of the two carriers (20, 30) is rotated into a predetermined stop position (SP) within a predefined braking time (BT) that begins upon exiting synchronous operation, whereby the knife (21, 22) and tube (31 to 34) are always located outside their common cutting positions. The aforementioned steps for shutting down the cutting device (1) are carried out according to the method of the invention.