Thread Rolling Distance Adjustment Using Worm-Eccentric Drive
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Solution Overview
Problem
Existing thread rolling machines face difficulties in easily and precisely adjusting the thread-rolling distance due to the requirement of applying a large force and the limitations imposed by the small outer diameter of the third regulating unit, which restricts the number of threaded units and affects the strength of the adjustment mechanism.
Innovation Solution
The adjustment device incorporates a worm assemblage with a worm shaft, a regulating unit, and an engagement portion, along with a drive assemblage featuring a first and second drive unit with a linking portion. This configuration allows for a slight and precise adjustment of the thread-rolling distance by rotating the worm shaft and driving the drive assemblage, thereby changing the position of the positioning portion and adjusting the distance between the second die unit and the positioning portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the third regulating unit is used to adjust the thread-rolling distance, then the adjustment mechanism is compact, but a larger force is required and the adjustment becomes laborious
Solution Approach 1:
The patent introduces a worm gear as an intermediary mechanism between the third regulating unit and the second regulating unit. The worm gear acts as a force amplifier and motion transformer, converting the small rotational force from the third regulating unit into sufficient linear force to move the second regulating unit and adjust the thread-rolling distance, thereby resolving the contradiction between compactness and ease of operation
Solution Approach 2:
The patent changes the mechanical parameters of the adjustment system by introducing a worm gear with specific gear ratio. This parameter change allows the system to transform rotational motion into linear motion while amplifying the input force, making the adjustment process easier without increasing the overall size of the mechanism
2Volume of moving object
If the threaded units on the third regulating unit are made smaller to fit its limited space, then the outer diameter constraint is satisfied, but the strength of the threaded units becomes insufficient to bear the required force
Solution Approach 1:
The worm gear serves as a force amplifier that compensates for the reduced size and strength of the threaded units on the third regulating unit. By introducing this intermediary mechanism, the system can use smaller, space-efficient threaded units while still generating sufficient adjustment force through the mechanical advantage provided by the worm gear
Solution Approach 2:
The patent replaces the direct mechanical connection between the third regulating unit and the adjustment mechanism with a worm gear transmission system. This substitution allows the use of smaller threaded units by introducing a mechanical advantage system that amplifies the input force, resolving the contradiction between size constraints and strength requirements
3Device complexity
If the third regulating unit has a small outer diameter, then the device is compact, but the number of threaded units is restricted affecting adjustment precision
Solution Approach 1:
The worm gear acts as an intermediary that decouples the size constraints of the third regulating unit from the precision requirements of the adjustment mechanism. It allows the system to maintain compact dimensions while achieving precise adjustment through the cumulative effect of multiple worm gear teeth engagements
Solution Approach 2:
The worm gear transmission provides periodic action through its tooth-by-tooth engagement mechanism. This periodic interaction between the worm gear teeth and the gear teeth enables precise incremental adjustment of the thread-rolling distance, allowing accurate positioning even with a compact third regulating unit that has limited space for threaded units
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 enables easy and precise adjustment of the thread-rolling distance, reducing the effort required for adjustments and ensuring accurate processing of workpieces with different sizes, while also effectively bearing the forces involved during the adjustment process.
Implementation Method 1
The worm shaft and the regulating unit facilitate a slight rotation of the drive assemblage, thereby achieving a slight and precise adjustment in the thread-rolling distance and saving the effort for executing the adjustment
Implementation Method 2
a rotation of the eccentric wheel 132 is carried out by a rotation of the transmission wheel 131 so that the transmission shaft 133 is driven by the rotation of the eccentric wheel 132 to thereby attain a forward and backward movement
Data Source
Figure 1
Figure 1A
Figure 2
AI summary
An adjustment device (4) is connected to a transmission device (33) of a thread rolling machine (3). The transmission device (33) includes an eccentric wheel (332) and a transmission shaft (333). The adjustment device (4) includes a drive assemblage (42) and a worm assemblage (43) linked with the transmission shaft (333). The worm assemblage (43) includes a worm shaft (431) meshed with the drive assemblage (42) and a regulating unit (433) disposed on the worm shaft (431). The drive assemblage (42) includes a first drive unit (421) disposed on a first shaft end (333A) of the transmission shaft (333) and defining a positioning portion (422) whose center is situated away from a center of the first drive unit (421) to present an eccentric arrangement. Accordingly, the cooperation between the drive assemblage (42) and the worm assemblage (43) allows a thread-rolling distance applied to the thread rolling machine (3) to be easily and precisely adjusted.