Pipe Threading Die Head Cam Lock to Prevent Loosening
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Solution Overview
Problem
Existing powered pipe threading machines face challenges in securely locking the thread-cutting die head in place, particularly during the threading process, which can lead to unintentional loosening and reduced efficiency.
Innovation Solution
The proposed thread-cutting die head incorporates a locking system that includes a positioning screw, a cam washer, and a pin, along with a cam handle and aperture, which imparts a clamping force to lock the rotational position of the cam plate relative to the die carrier, preventing unintentional loosening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lock lever with adjustment screw is used to lock the cam plate, then the die head can be secured in position, but the locking mechanism is complex and requires manual tightening which may lead to unintentional loosening
Solution Approach 1:
The invention extracts the locking function from the complex manual adjustment screw mechanism and implements it through a dedicated locking pin that engages with a slot in the cam plate. This separate locking component simplifies the overall system by dedicating a specific simple element to the locking function, reducing reliance on the complexity of manual screw tightening while improving reliability through positive mechanical engagement.
Solution Approach 2:
The locking pin acts as an intermediary element between the cam plate and the die head assembly. Rather than relying on the adjustment screw to provide both positioning and locking functions, the locking pin provides a dedicated mechanical intervention that secures the cam plate in its adjusted position, preventing unintentional loosening while maintaining the simplicity of the overall locking system.
2Ease of operation
If manual tightening of adjustment screw is used, then the cam plate can be locked, but it may loosen unintentionally during the threading process
Solution Approach 1:
The locking pin with its engaged slot creates a self-servicing locking mechanism that maintains its locking force during operation. Once the cam plate is adjusted and the locking pin is inserted into the slot, the system automatically maintains the locked position without requiring continuous manual intervention or adjustment during the threading process, preventing unintentional loosening while preserving ease of initial adjustment.
3Reliability
If the locking system uses multiple components like bushing, coupler, and spring, then the locking is more secure, but the device complexity increases
Solution Approach 1:
The locking system is segmented into distinct functional components: the locking pin provides the primary mechanical lock, the slot in the cam plate provides the engagement feature, and the spring-coupler mechanism provides auxiliary retention. This segmentation allows each component to perform its specific function efficiently, achieving secure locking while keeping the overall system manageable through clear functional division rather than a monolithic complex 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 locking system effectively secures the thread-cutting die head in place, preventing unintentional loosening during the threading process, thereby enhancing the efficiency and reliability of the powered pipe threading machine.
Implementation Method 1
Rotation of the cam handle in a first direction about the rotational axis is configured to impart a clamping force against the cam washer to lock the rotational position of the cam plate relative to the die carrier
Implementation Method 2
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
Data Source
AI summary
A thread-cutting die head includes a die carrier supporting thread-cutting dies for displacement in a radial direction, a cam plate coaxial with the die carrier including a plurality of cam members for engaging the thread-cutting dies and 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 positioning screw extending through an arcuate slot in the cam plate, a cam washer surrounding the positioning screw, and a pin threaded to the positioning screw. The locking system further includes a cam handle including a cylindrical cam portion engaged with the cam washer. Rotation of the cam handle in a first direction is configured to impart a clamping force against the cam washer to lock the rotational position of the cam plate relative to the die carrier.