Strap Cutting Device Punch Mechanism High Prestress
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Solution Overview
Problem
Existing separating devices for straps, particularly those used for cutting steel straps with high material thickness, fail to securely hold the severed end, leading to uncontrolled springing open and potential damage or injury due to insufficient clamping force from friction surfaces, which cannot manage prestresses above 40 to 50 kN.
Innovation Solution
A separating device with a pressing element designed as a punch that partially penetrates the strap, forming a punched part which acts like a claw to securely hold the severed end, combined with a cutting blade and a foot with a pushing edge, allowing for controlled cutting of high-strength steel straps with tensile strengths up to 1,200 N and more.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional clamping devices with friction surfaces are used to hold the strap, then the device structure remains simple, but the device fails to securely hold high-strength steel straps with prestresses above 40 to 50 kN
Solution Approach 1:
The pressing element is designed as a punch that penetrates the strap and divides it into two parts: a punched-out part and a remaining strap. This segmentation allows the punch to mechanically interlock with the strap through the punched-out part, creating a secure holding mechanism that can withstand high prestresses without relying on friction alone.
Solution Approach 2:
The holding mechanism transitions from a two-dimensional friction-based surface contact to a three-dimensional mechanical interlocking structure. The punch creates a hole through the strap, and the punched-out part acts as a connector between the punch and the strap, adding a new spatial dimension to the holding mechanism that enables secure attachment of high-strength straps.
2Reliability
If friction surfaces are used to hold the strap, then the device can handle conventional straps, but it cannot control steel straps with high prestresses of 40 to 50 kN or more
Solution Approach 1:
The pressing element penetrates the strap and segments it into a punched-out part and the remaining strap. The punched-out part serves as a mechanical connector that positively engages with both the punch and the strap, creating a reliable holding mechanism capable of withstanding high prestresses through mechanical interlocking rather than friction.
Solution Approach 2:
The punched-out part acts as an intermediary element between the punch and the strap. This intermediate component mechanically connects the punch to the strap, transferring and distributing the high prestresses through a dedicated structural element rather than relying on direct friction contact between the pressing element and the strap surface.
3Adaptability or versatility
If a punch that penetrates the strap is used, then high-strength steel straps can be securely held and cut, but the device complexity increases compared to simple friction-based clamps
Solution Approach 1:
The punch-based pressing element serves multiple functions: it penetrates the strap to create a hole, the punched-out part acts as a connector, and the entire assembly provides a secure mechanical interlocking mechanism. This multi-functional design allows the same pressing element to handle various types of high-strength straps without requiring different clamping mechanisms for different strap types.
Solution Approach 2:
The invention changes the fundamental parameter of the pressing mechanism from friction-based surface contact to penetration-based volumetric engagement. By changing the interaction mode from two-dimensional friction to three-dimensional mechanical interlocking through penetration, the device achieves universal applicability to high-strength straps while maintaining a relatively simple overall structure.
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
The present invention relates to a cutting device for strapping bands (1). This device is equipped with a movable pressure element (4), a foot (2) with a push edge (3) for the strapping band (1) that can be fixed between the foot (2) and the pressure element (4), and a cutting blade (5) for cutting the fixed strapping band (1). According to the invention, the pressure element (4) is designed as a punch (4) that penetrates at least partially into the strapping band (1).