Insulated Spindle Locking Element for Safe Tool Exchange
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Solution Overview
Problem
Machine tools pose a risk of electric shock to operators when exchanging tools, as the conductive locking device can bypass the electrical insulation of the spindle, potentially charging the machine tool housing and exposing the operator to danger.
Innovation Solution
The locking device is equipped with an electrically insulating mounting device and actuation element, using a sleeve and spring mechanism to prevent electrical discharge through the machine tool housing, ensuring the locking element remains insulated from the spindle and housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the locking element is made of metal for stability, then the locking device achieves sufficient mechanical strength and stability, but the locking element becomes electrically conductive and can bypass the electrical insulation of the spindle, creating a risk of electric shock to the operator
Solution Approach 1:
The locking device is segmented into two separate components: a metal locking element that provides mechanical stability and an electrically insulating mounting device that provides electrical insulation. This segmentation allows each component to fulfill its specific function without compromising the other, resolving the contradiction between mechanical strength and electrical safety.
Solution Approach 2:
The locking device uses a composite structure combining metal (for the locking element) and electrically insulating material (for the mounting device). This composite approach allows the system to simultaneously achieve the mechanical properties of metal and the electrical insulation properties of non-conductive materials, eliminating the electric shock risk while maintaining locking stability.
2Object-affected harmful factors
If the locking element is made of electrically insulating material, then the risk of electric shock is eliminated, but the mechanical stability and strength of the locking device are reduced
Solution Approach 1:
The locking device is divided into functional segments: the locking element (metal) handles mechanical loading and stability requirements, while the mounting device (electrically insulating material) handles electrical insulation and positioning. This functional segmentation resolves the contradiction by assigning each material property to the component where it is most needed.
Solution Approach 2:
The electrically insulating mounting device acts as an intermediary between the metal locking element and the machine tool housing. It mediates the connection, providing both mechanical support for the locking element and electrical insulation to prevent charge discharge, thus resolving the contradiction between electrical safety and mechanical functionality.
3Ease of manufacture
If the locking device is mounted directly in the machine tool housing, then the structure is simple and easy to manufacture, but the locking element can come into contact with the housing and bypass the electrical insulation when the spindle is charged
Solution Approach 1:
The electrically insulating mounting device serves as an intermediary component between the locking element and the machine tool housing. It provides the necessary electrical insulation to prevent charge discharge through the housing while maintaining the structural connection, thus resolving the contradiction between manufacturing simplicity and electrical safety.
Solution Approach 2:
The mounting device is made of electrically insulating material, creating a composite structure where the metal locking element is mounted on the insulating support. This composite approach allows direct mounting in the housing (maintaining simplicity) while adding the crucial electrical insulation function to prevent harmful discharge.
Data Source
AI summary
A machine tool having a tool holder for exchangeably holding a tool is provided, the machine tool including: a machine tool housing; a spindle rotatably mounted in the machine tool housing a drive end being connected to a drive for rotating the spindle about an axis of rotation and a holding end being coupled to the tool holder; and a locking device arranged in the machine tool housing and which has a locking element reversibly movable between a release position and a locking position, a locking end of the locking element having an interlocking connector and the spindle having a mating interlocking connector, the interlocking connector being disengaged from the mating interlocking connector in the release position to enable rotational motion of the spindle, and the interlocking connector being engaged with the mating interlocking connector in the locking position to prevent rotational motion of the spindle and to enable an exchange of the tool of the tool holder, the locking device also including an electrically insulating mounting device for mounting the locking element in the machine tool housing to electrically insulate the locking element from the machine tool housing.