Rolling Mill Infeed Protection with Segmented Safety Window
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Solution Overview
Problem
Existing infeed protection systems for rolling mills do not adequately prevent operator injury or machine damage when the safety cover is closed, as they hinder product supply and dry running detection, necessitating operation with the rollers open, which increases the risk of objects or body parts entering the gap between rollers.
Innovation Solution
An infeed protection device with a parallel profile and adjustable bars forming a gap between the rollers, equipped with a removable spatula for cleaning and product distribution, and a magnetic switch for ensuring proper installation, allowing safe operation with the machine open while preventing finger access and product adherence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a safety cover is closed over the supply opening, then operator safety is improved, but product supply and dry running detection become difficult or impossible
Solution Approach 1:
The safety cover is segmented into a fixed part and a movable transparent window section. The transparent window can be opened independently to allow product supply and dry running detection while the rest of the cover remains closed to maintain operator safety.
Solution Approach 2:
A magnetic switch acts as an intermediary between the transparent window position and the control system. It detects whether the window is open or closed and automatically adjusts the roller operation accordingly, enabling safe operation with the window open.
2Ease of operation
If the safety cover is opened to supply product or distribute it, then ease of operation is improved, but the risk of objects or body parts getting between the rollers increases
Solution Approach 1:
The cover is divided into fixed protective sections and a movable transparent window. This allows the window to be opened for product supply while the fixed sections maintain protection against objects or body parts entering the roller gap.
Solution Approach 2:
The transparent window allows visual monitoring of the roller gap and product flow, enabling operators to detect dry running conditions or foreign objects without opening the cover, thus maintaining safety while ensuring proper operation.
3Ease of operation
If the transparent window is opened for product supply, then product distribution is enabled, but finger access to the roller gap becomes possible
Solution Approach 1:
The magnetic switch acts as an intermediary that automatically detects when the transparent window is open and controls the roller operation accordingly, enabling product supply while preventing direct finger access to the dangerous roller gap.
Solution Approach 2:
The mechanical interlocking system is replaced with a magnetic field-based detection system. The magnetic switch non-contactlessly detects the window position and automatically controls the roller operation, eliminating the need for mechanical guards that could be bypassed.
4Reliability
If the infeed protection device prevents product supply through the gap, then operator safety is improved, but product flow may be hindered
Solution Approach 1:
The protection device has different properties in different locations: the fixed cover sections provide safety, while the transparent window area allows product flow. The gap dimensions are specifically designed to prevent finger access while permitting product passage.
Solution Approach 2:
The system dynamically adjusts its state based on the transparent window position. When the window is open for product supply, the magnetic switch automatically enables roller operation. When closed, it maintains protection. This dynamic response ensures both safety 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
Enhances operational safety by enabling product distribution and dry running detection without risking operator injury, while preventing objects from entering the roller gap and reducing product adherence on the protection device, thus ensuring safer and more efficient operation of rolling mills.
Implementation Method 1
The infeed protection device can further comprise a device for stopping the rolling mill in case the infeed protection device has been positioned improperly or is missing. The device for stopping the rolling mill can be configured as a magnetic switch.
Data Source
AI summary
An infeed protection device for a rolling mill, comprising a housing and a plurality of parallel rotating rollers. A product infeed is formed by two of the rollers which rotate about rotational axes arranged parallel with one another and arranged at an adjustable roller space with respect to one another. The infeed protection device comprises a profile which is arranged parallel with the rollers forming the product infeed and extends over the length of the product infeed. In an infeed direction of the rotating rollers, the profile is upstream of the rollers forming the product infeed. At least one vertical through-opening is formed in the profile. A space is formed between the profile and the rollers. The infeed protection device further comprises a holder for fastening the infeed protection device to the housing of the rolling mill.