Hydraulic Bolt Tensioner With External Anti-Rotation Guide
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Solution Overview
Problem
Existing screw tensioning devices in steel constructions and engine design applications face challenges in operational safety and maintainability, particularly due to wear and increased hazard potential from high fluid pressure in the tensioning process.
Innovation Solution
A device for tensioning connecting elements featuring a guiding unit outside the fluid chamber to prevent rotational movement between the piston and fixation element, reducing wear and enhancing accessibility, while using a hydraulic actuating unit to manipulate the fluid chamber volume and apply tension to the connecting element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the guiding unit is arranged inside the fluid chamber, then the rotational movement between piston and fixation element is prevented, but the device complexity increases and maintainability deteriorates
Solution Approach 1:
The guiding unit is extracted from the fluid chamber and arranged in the fixation element outside the fluid chamber. This separation removes the guiding function from the high-pressure fluid environment, reducing device complexity and improving maintainability while still preventing rotational movement between the piston and fixation element during operation.
2Reliability
If the guiding unit is arranged inside the fluid chamber, then rotational movement is prevented, but accessibility for maintenance deteriorates
Solution Approach 1:
The guiding unit is positioned in the fixation element outside the fluid chamber, making it externally accessible. This allows maintenance personnel to inspect, clean, and repair the guiding unit without disassembling the fluid chamber, significantly improving maintainability while the guiding unit continues to prevent rotational movement during operation.
3Force
If high fluid pressure is used for tensioning, then the pulling force is sufficient, but the hazard potential increases
Solution Approach 1:
The guiding unit is positioned outside the fluid chamber, separating the mechanical guidance function from the high-pressure fluid system. This reduces the volume of high-pressure fluid required for operation, thereby reducing the hazard potential associated with fluid compression while maintaining sufficient pulling force through the hydraulic actuation of the piston.
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 enhances operational safety by reducing wear and improving maintainability, increasing the durability of the device and reducing the hazard potential from fluid compression, while maintaining effective tensioning and loosening capabilities.
Implementation Method 1
an actuating unit having a fluid chamber for receiving a fluid and a piston which is translationally guided in the fixation element. The actuating unit is configured for manipulating a volume of the fluid chamber by translationally actuating the piston, i.e. relative to the fixation element, so as to move the fixation element relative to the support element
Implementation Method 2
A device for tensioning connecting elements featuring a guiding unit outside the fluid chamber to prevent rotational movement between the piston and fixation element, reducing wear and enhancing accessibility
Data Source
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AI summary
The present invention refers to a device (10) for tensioning a connecting element (12) fastened to a component (18, 20) to be tightened, which comprises a fixation element (24) for receiving and holding the connecting element (12); a support element (40) for supporting the device (10) against the component (20); and an actuating unit (44) with a fluid chamber (50) for receiving a fluid and a piston (48) which is translationally guided in the fixation element (24). The actuating unit (44) is configured for manipulating a volume of the fluid chamber (50) by translationally actuating the piston (48) so as to move the fixation element (24) relative to the support element (40). Further, the device comprises a guiding unit (106) for locking a relative rotational movement between the piston (48) and the fixation element (24), wherein the guiding unit (106) is arranged outside of the fluid chamber (50).