Doctor Blade Pull-Out Device with Cover Plate Extension
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Solution Overview
Problem
Existing devices for extracting a doctor blade from a paper machine require manual handling, posing a risk of injury and necessitating a large distance for operator intervention, which is inefficient and hazardous.
Innovation Solution
A device with a cover plate extension component and driven feed rollers that allows the doctor blade to be pulled out without manual grasping, positioning the feed rollers to securely grip and extract the blade, eliminating the need for manual handling and reducing the extraction distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual handling is used to extract the doctor blade, then the extraction process is simple, but operator safety is compromised and large distance is required
Solution Approach 1:
A feed station with grippers is introduced as an intermediary device between the operator and the doctor blade. The grippers automatically grasp the blade at the feed station and transport it to the extraction point, eliminating the need for operators to manually handle the blade edge, thus resolving the safety issue while maintaining operational simplicity
Solution Approach 2:
The extraction device is designed to automatically perform the extraction process without requiring operator intervention for the critical grasping and pulling actions. The system serves itself by using the feed station to automatically position and grasp the blade, reducing reliance on manual labor and improving safety
2Device complexity
If manual grasping and pulling is used, then device complexity is low, but extraction distance becomes large
Solution Approach 1:
The feed station is positioned along the longitudinal axis of the paper machine, allowing the extraction process to occur in the longitudinal dimension rather than requiring lateral extension. This reduces the extraction distance in the lateral direction while maintaining the necessary functional complexity through automated feed mechanisms
Solution Approach 2:
The feed station performs preliminary actions by pre-grasping and pre-positioning the doctor blade before the actual extraction occurs. This preliminary grasping action at the feed station eliminates the need for operators to reach far forward, reducing the required extraction distance while keeping the overall device structure relatively simple
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 ensures safe and efficient extraction of the doctor blade by automating the process, reducing operator risk and minimizing space requirements, allowing for easier maintenance and replacement.
Implementation Method 1
These feed rollers then pinch the front end of the scraper blade to be pulled out and pull the scraper blade completely out of the scraper holder due to their drive
Implementation Method 2
These feed rollers then pinch the front end of the scraper blade to be pulled out and pull the scraper blade completely out of the scraper holder due to their drive
Data Source
Figure 1~3
Figure 4~6
AI summary
The invention relates to a device for pulling a doctor blade (1) out of the doctor holder of a production machine (4), in which the doctor holder has a covering plate (2) and holding fingers (3) which are fastened to the covering plate (2), and the doctor blade (1) is mounted between the covering plate (2) and the holding fingers (3). Furthermore, a pulling-out device (5) is provided, by means of which the doctor blade (1) is pulled out of the doctor holder. A covering plate extension component (10) is fastened to the covering plate (2) of the doctor holder. The length of the doctor blade (1) is selected in such a way that the doctor blade (1) projects beyond the covering plate extension component (10) towards the front. In order to grip and pull out the doctor blade (1), the housing (6) of the pulling-out device (5) is guided up to the covering plate extension component (10) in such a way that that front end of the doctor blade (1) which projects beyond the covering plate extension component (10) towards the front is guided through the lips (7a, 7b) of the inlet guide (7) as far as into the region between the intake rollers (8, 9).