Tool-Changing Mandrel Mechanism Without Disc Spring Bulk
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Solution Overview
Problem
Conventional tool loosening and pulling mechanisms in machine tools require a large volume due to the need for a disc spring's restoring force, making them inconvenient for usage.
Innovation Solution
A tool changing mechanism with a mandrel, first and second linked units, and a screwing rotation mechanism between the pulling rods, allowing for relative movement without the need for a disc spring, thereby reducing the overall volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a disc spring is used to provide restoring force for tool loosening and pulling, then the tool can be effectively loosened and pulled, but the volume of the mechanism increases due to the space required to accommodate the disc spring
Solution Approach 1:
The invention extracts and eliminates the disc spring component from the traditional tool loosening and pulling mechanism. By removing the disc spring, the patent achieves compact design without compromising the tool loosening and pulling functionality, directly resolving the contradiction between reliability and volume.
Solution Approach 2:
The invention replaces the mechanical disc spring-based restoring force system with an alternative mechanical linkage system. The new mechanism uses a series of linked components including a pulling rod, pressing head, and elastic element arranged in a compact configuration, substituting the traditional disc spring mechanism while maintaining functional equivalence.
2Force
If a disc spring is used to provide restoring force, then the tool pulling function is achieved, but the space required for the disc spring increases the overall mechanism volume
Solution Approach 1:
The invention employs a nested arrangement where the elastic element is positioned within the chamber formed by the mandrel and pulling rod assembly. The pressing head and linked units are arranged in a compact nested configuration, allowing the mechanism to generate sufficient restoring force while occupying minimal space.
Solution Approach 2:
The invention transitions from a linear disc spring expansion in one dimension to a multi-dimensional compact linkage system. The elastic element operates in a confined chamber space, utilizing three-dimensional spatial arrangement to achieve the required force generation without increasing the overall footprint of the mechanism.
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 mechanism achieves a more space-saving design for tool changing, enhancing stability and reducing the volume of the tool changing mechanism compared to prior art, while maintaining effective tool loosening and pulling capabilities.
Implementation Method 1
The internal thread of the second pulling rod is screwed onto the external thread of the first pulling rod, and the relative screwing rotation therebetween enables the second pulling rod and the first pulling rod to approach or leave each other.
Data Source
AI summary
A tool changing mechanism includes a tool base housing, a mandrel disposed therein and having a chamber and a keyway provided axially, and first and second linked units. A first shoulder portion is provided at an end of the keyway, and pulling jaws are disposed at the other end. The first linked unit has a first pulling rod, an end of which has an external thread, and the other end has a connecting portion driven by a pneumatic cylinder. The second linked unit has a second pulling rod, an end of which has an internal thread, and a pressing head is disposed at the other end. The second pulling rod has a sliding key located in the keyway. The first pulling rod is screwed into the second pulling rod, and the relative screwing rotation therebetween attains tool pulling for fixing or tool loosening for removing the cutting tool.