Traction Sheave Clamping Device Torque Support
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Solution Overview
Problem
Existing traction sheave clamping devices for Koepe hoists face issues with torque application on screw bolts due to unfavorable friction conditions and improper installation, leading to screw bending.
Innovation Solution
A traction sheave clamping device featuring anchoring pieces with torque support surfaces extending in the direction of bolt tension, multiple partial support surfaces for enhanced engagement, and screw bolt center axes aligned with anchoring points to minimize bending stress, along with optional ball-moving washers for manufacturing tolerance compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional anchoring pieces are used with wedge-shaped grooves, then the clamping device can be manufactured and installed, but the internal support creates torque on the clamping screw leading to bending
Solution Approach 1:
The patent introduces a new dimensional aspect by extending the support surface of the anchoring piece in the direction of bolt tension. This creates a torque support surface that extends beyond the anchor point, effectively adding a stabilizing dimension to the anchoring structure that prevents torque-induced bending of the clamping screw.
Solution Approach 2:
The torque support surface is designed to extend in advance in the direction of bolt tension, creating preliminary support against torque forces before they can cause bending. This pre-positioned support surface intercepts and distributes the torque loads, preventing them from concentrating on the clamping screw.
2Strength
If the anchoring piece geometry is changed to improve torque support, then screw bending is reduced, but the device complexity increases
Solution Approach 1:
The patent applies local quality by modifying only the specific region of the anchoring piece that contacts the groove surface. The torque support surface is added locally at the engagement interface, while the rest of the anchoring piece maintains its original simple geometry. This localized modification provides torque support without requiring complete redesign of the entire anchoring structure.
3Ease of operation
If manufacturing tolerances are not compensated, then the design remains simple, but improper installation leads to unfavorable friction conditions and screw bending
Solution Approach 1:
The patent changes the geometric parameters of the anchoring piece by extending the support surface in the direction of bolt tension. This parameter modification creates a mechanical advantage that compensates for variations in installation quality and friction conditions, making the connection more reliable across different installation scenarios.
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 effectively supports torque within the anchoring piece, reducing torque applied to screw bolts and preventing bending stress, thereby enhancing torque stability and ease of manufacturing and operation.
Implementation Method 1
the friction conditions are unfavorable
Implementation Method 2
wedge-shaped circumferential grooves are provided on the outer end faces of the traction sheave or the cable lining rim plates, into which the traction sheave clamps engage via anchoring pieces and are braced by means of bolts
Implementation Method 3
whose extension in the direction of tension of the bolts is a multiple of the distance between the central axis of the bolt and the anchor point
Implementation Method 4
a torque that occurs is better supported in the anchoring piece, so that as little torque as possible is applied to the screw bolt
Data Source
Figure 1~2
Figure 3~4
AI summary
A traction sheave clamping device for detachably fixing ropes to the traction sheave of a Koepe hoist, having at least one clamp crossbeam, at least two anchoring elements for engaging in wedge-shaped or hook-shaped grooves in the face sides of the traction sheave/cable chuck rim sheets, and stud bolts for connecting the anchoring elements to the clamp crossbeam, wherein the anchoring elements and the traction sheaves have corresponding torque support surfaces extending substantially in the pull direction of the stud bolts, wherein the extension of the torque support surfaces in the pull direction of the stud bolts is a multiple of the distance between the stud bolt centre axis and the anchoring point.