Scraper Bar Adjustment Mechanism for Paper Machine Screen Belt
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Solution Overview
Problem
Existing systems for producing paper tape face difficulties in adjusting the height and angular position of scraper strips relative to the sieve belt, leading to high actuating forces and frequent cleaning needs due to contamination in link guides.
Innovation Solution
An adjusting device featuring a pivotable angle lever, an adjustable actuating cylinder, and link elements with pivot pins, allowing for precise adjustment of the scraper bar's height and angular position relative to the support bar, eliminating the need for control blocks and reducing contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If control blocks with slotted guides are used to adjust the scraper bar height and angle, then the scraper bar can be adjusted relative to the support bar, but the guide rail becomes contaminated with mixture components making it difficult to move
Solution Approach 1:
The invention extracts the harmful function of the guide rail from the adjustment mechanism. Instead of using a guide rail that becomes contaminated and difficult to move, the patent uses a control block with a slotted guide that allows the adjusting spindle to move freely without contamination issues. The control block translates the rotational movement of the adjusting spindle into linear movement of the scraper bar, eliminating the need for a contaminated guide rail.
Solution Approach 2:
The control block acts as an intermediary between the adjusting spindle and the scraper bar. It converts the rotational movement of the adjusting spindle into the linear movement required for scraper bar adjustment, while the slotted guide within the control block provides a contamination-resistant path for movement.
2Ease of operation
If the guide rail is used for movement, then adjustment is possible, but very high actuating forces are required due to contamination and friction
Solution Approach 1:
The invention removes the guide rail that requires high actuating forces and replaces it with a control block featuring a slotted guide. This slotted guide allows the adjusting spindle to move with minimal friction and without contamination, dramatically reducing the actuating force required from the adjusting spindle.
Solution Approach 2:
The patent replaces the mechanical guide rail system with a control block mechanism that uses a slotted guide. This substitution eliminates the high friction and contamination issues of the guide rail, allowing the adjusting spindle to move the scraper bar with much lower actuating forces.
3Ease of operation
If the adjusting spindle is oversized to overcome high friction, then movement is possible, but the device complexity and size increase
Solution Approach 1:
The invention extracts the problematic guide rail that necessitated an oversized adjusting spindle. By replacing it with a control block with a slotted guide, the friction and contamination are eliminated, allowing the use of a smaller, more compact adjusting spindle while maintaining full movement capability.
4Device complexity
If the guide rail is used without frequent cleaning, then the system is simpler, but contamination causes difficulty in movement and reduced reliability
Solution Approach 1:
The invention removes the guide rail that requires frequent cleaning to maintain reliability. The control block with its slotted guide provides a contamination-resistant adjustment mechanism that maintains reliable movement without requiring frequent cleaning interventions.
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
Enables efficient adjustment of the scraper bar's position with reduced actuating forces and minimized contamination, enhancing the scraping and suction effects while reducing maintenance needs.
Implementation Method 1
the actuating cylinder (66) is formed with a spiral groove (66a) on its side facing the angle lever (61), and an arcuately curved actuating plate (68) with teeth (68a) is attached to the support bar (2). This plate cooperates with the spiral groove to allow the angle lever (61) to be pivoted by rotating the actuating cylinder (66).
Implementation Method 2
an adjusting rod (64) hinged on one side to the angle lever (61) and on the other side to the scraper bar (1). The adjusting rod (64) can be adjustable in its effective length.
Data Source
Figure 1~1A
Figure 2
Figure 3
AI summary
Device for adjusting a stripper bar (1) in a system for producing a paper ribbon with a screen belt (3), to which stripper bars (1) are assigned that are oriented transversely to its direction of movement and are spaced apart from one another, wherein the stripper bar (1) is supported by a support bar (2) and is adjustable relative to the support bar (2) and the screen belt (3) by means of an adjusting device (6), wherein the stripper bar (1) and the support bar (2) are coupled to each other by means of links (4, 5) mounted on them and by means of a displacement of the stripper bar (1) relative to the support bar (2) the distance or the angular position of the stripper bar (1) relative to the support bar (2) and thus relative to the screen belt (3) is adjustable.