Pipe Threader Die Head Locking for Tool-Free Cam Plate Clamping
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Solution Overview
Problem
Existing powered pipe threading machines face challenges in securely locking the thread-cutting die head to the cam plate, requiring additional tools for clamping and risking unintentional loosening during operation.
Innovation Solution
A thread-cutting die head with a locking system featuring a bushing, die-locking arm, positioning screw, and coupler, which allows for frictional locking without additional tools, using a spring for biasing and a coupler for co-rotation to secure the cam plate relative to the die carrier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking system with bushing, die-locking arm, and positioning screw is used, then the clamping force and reliability are improved, but the device complexity increases
Solution Approach 1:
The locking system employs a nested structure where the die-locking arm pivots on the bushing, which is threaded to the positioning screw. The coupler engages with both the die-locking arm and bushing, creating a compact nested arrangement that achieves reliable locking without excessive complexity.
Solution Approach 2:
The positioning screw extends through an arcuate slot in the cam plate and the die-locking arm, allowing the locking mechanism to self-adjust and maintain position through the threaded connection between the bushing and positioning screw, reducing the need for additional adjustment components.
2Ease of operation
If frictional locking is used to secure the cam plate, then the ease of operation is improved, but the risk of unintentional loosening increases
Solution Approach 1:
The locking system transitions from a static friction-based lock to a dynamic system where the coupler can engage or disengage from the die-locking arm. When engaged, the coupler prevents unintentional loosening while allowing intentional operation through controlled engagement and disengagement of the coupler with the die-locking arm, maintaining reliability while preserving ease of operation.
3Manufacturing precision
If additional tools are used for clamping the die head, then the manufacturing precision is improved, but the productivity decreases
Solution Approach 1:
The locking system is designed to be self-contained, with the die-locking arm pivoting on the bushing and the coupler engaging with both components. This integrated design eliminates the need for external clamping tools, allowing operators to quickly secure the die head using only the built-in mechanism, thereby improving productivity while maintaining positioning precision.
4Ease of operation
If a spring is added for biasing the coupler, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The spring provides a biasing force that counteracts the friction and mechanical resistance in the locking system. By pre-loading the coupler in a specific direction, the spring reduces the effort required to engage or disengage the coupler from the die-locking arm, improving ease of operation while adding only one component to the system.
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 locking system ensures secure clamping of the cam plate without the need for additional tools, preventing unintentional loosening during pipe threading operations, and facilitates quick exchange of pipes with the same nominal diameter.
Implementation Method 1
rotation of the die-locking arm in a first direction is configured to rotate the bushing relative to the positioning screw in a tightening direction, thereby imparting a clamping force between the bushing and the cam plate to develop a frictional force for locking the rotational position of the cam plate relative to the die carrier
Implementation Method 2
a spring for biasing the coupler away from the first position and toward a second position in which the coupler is disengaged from the die-locking arm
Data Source
AI summary
A thread-cutting die head includes a die carrier supporting thread-cutting dies, a cam plate coaxial with the die carrier including cam members displacing the cutting dies in a radial direction in response to relative rotation between the cam plate and the die carrier, and a locking system. The locking system includes a bushing, a die-locking arm pivotably supported upon the bushing, a positioning screw extending through an arcuate slot in the cam plate and the die-locking arm, the bushing threaded to the positioning screw, and a coupler coupled for co-rotation with the bushing and engaged with the die-locking arm when the coupler is in a first position, in which rotation of the die-locking arm in a first direction rotates the bushing in a tightening direction, imparting a clamping force between the bushing and the cam plate to lock the rotational position of the cam plate relative to the die carrier.