Variable Pitch Nut Screw Conveying Device
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Solution Overview
Problem
Conventional nut screw conveying devices have a fixed pitch, limiting their ability to vary the output stroke in response to changes in the rate of rotation, making them unsuitable for applications requiring flexible movement.
Innovation Solution
A nut screw conveying device with a nut featuring variable pitch threads on its inner surface, matched by an equal number of rotating media such as bearings or balls on the screw, allowing for flexible output stroke adjustment while maintaining a constant screw rotation rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single pitch thread is used on the nut, then the structure is simple and easy to manufacture, but the output stroke cannot be flexibly adjusted for varying rotation rates
Solution Approach 1:
The nut is divided into multiple thread sections, each with different pitch values. The inner circumferential surface of the nut features first, second, and third threads with progressively different pitches, allowing the output stroke to be adjusted in discrete steps based on which thread section is engaged with the corresponding rotating medium.
Solution Approach 2:
The thread pitch is made variable along the axial direction of the nut. Instead of a uniform pitch, the pitch changes dynamically from the first thread section to the second and third thread sections, enabling the system to adapt the output stroke to different rotation rates of the screw.
2Adaptability or versatility
If multiple variable pitch threads are formed on the nut, then the output stroke can be flexibly adjusted, but the manufacturing complexity increases
Solution Approach 1:
The variable pitch thread is segmented into distinct thread sections (first, second, third threads) with clearly defined different pitch values. This segmentation makes the manufacturing process more manageable by allowing each section to be formed with specific pitch parameters rather than requiring a continuous complex variable pitch profile.
Solution Approach 2:
Different portions of the nut's inner circumferential surface are given different thread pitches according to their specific functional requirements. The first thread section has a different pitch from the second and third sections, allowing each local region to be optimized for specific output stroke requirements while simplifying the overall manufacturing approach.
3Adaptability or versatility
If the pitch is kept constant, then the manufacturing is simple, but the device cannot adapt to varying output stroke requirements
Solution Approach 1:
The thread pitch is made dynamic by introducing multiple pitch values along the axial length of the nut. The pitch transitions from the first thread section through the second to the third thread section, creating a dynamic relationship between the nut position and the effective pitch, which enables adaptation to varying rotation rates and output stroke requirements.
Solution Approach 2:
Different axial sections of the nut are assigned different pitch characteristics. The first thread section, second thread section, and third thread section each have locally optimized pitch values that correspond to specific operational requirements, allowing the device to respond to varying rotation rates without requiring a completely complex overall design.
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
Enables flexible adjustment of the nut's output stroke by varying the pitch of the threads, enhancing machining convenience, precision, and productivity, and allowing for increased torque transmission when needed, while maintaining constant screw rotation.
Implementation Method 1
a nut and a screw to convert rotational movement into translational movement
Implementation Method 2
Balls or bearings are provided between the screw and the nut in order to roll along the inner circumferential groove of the screw and the outer circumferential groove of the screw
Data Source
AI summary
A nut screw conveying device includes a nut and a screw to convert rotational movement into translational movement. In the nut screw conveying device, a plurality of different threads is spirally formed on an inner circumferential surface of the nut, and the screw is provided with a plurality of rotating media to be respectively engaged with the different threads.