Wire Feeder Slip Clutch for Push-Pull Torque Control
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Solution Overview
Problem
Existing push-pull wire feeder systems rely on expensive constant torque motors, limiting their versatility and preventing their use in constant speed, push-only modes, which is a more common form of wire electrode feeding.
Innovation Solution
Integration of a torque-managing device, such as a slip clutch, with the drive roller assembly in wire feeders to mimic constant torque motors, allowing for adjustable torque and preventing wire bunching or coiling, thereby enabling operation in both push-pull and constant speed modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If constant torque motors are used in push-pull wire feeder systems, then wire feeding reliability is improved, but system cost increases and versatility decreases
Solution Approach 1:
The wire feeder system is segmented into two independent drive systems: a push drive roller assembly with constant torque motor for reliable wire pushing, and a pull drive roller assembly with variable torque motor for flexible wire pulling. This segmentation allows each subsystem to be optimized for its specific function while maintaining overall system versatility across different operation modes.
Solution Approach 2:
The wire feeder system is designed with universal functionality to operate in multiple modes: push-pull mode using both drive systems, push-only mode using only the push drive system, and pull-only mode using only the pull drive system. This multi-functionality is achieved through independent control of the two drive roller assemblies, allowing the system to adapt to various welding applications without requiring different equipment.
2Manufacturing precision
If constant torque motors are used in wire feeders, then wire feeding control is improved, but system cost increases
Solution Approach 1:
Constant torque control is applied locally only where needed - specifically at the push drive roller assembly where precise wire feeding control is critical for preventing bunching and ensuring consistent wire delivery. The pull drive roller assembly uses variable torque control, which is sufficient for its function of retrieving wire from the spool. This localized application of constant torque control reduces overall system cost while maintaining necessary precision in the critical wire feeding path.
Solution Approach 2:
The system employs different torque parameters for different drive functions: the push drive motor operates with constant torque parameters to maintain precise control during wire feeding, while the pull drive motor operates with variable torque parameters that adapt to the varying load conditions of wire retrieval. This parameter differentiation allows cost-effective motor selection while maintaining control precision where required.
3Ease of manufacture
If variable torque motors are used in wire feeders, then system cost decreases, but wire bunching and coiling occurs
Solution Approach 1:
The push drive roller assembly with constant torque motor performs preliminary action by precisely controlling wire feeding before the wire reaches the welding arc. This preliminary precise control prevents wire bunching and coiling from occurring in the first place, eliminating the need for corrective actions later in the wire path. The constant torque control ensures consistent wire delivery speed and tension, preventing the conditions that lead to bunching.
Solution Approach 2:
The wire feeder system incorporates feedback control mechanisms that monitor wire feeding conditions and adjust motor torque in real-time. When wire bunching or coiling is detected through sensors monitoring wire tension and feed rate, the control system automatically adjusts the torque output of the push drive motor to prevent further bunching and may activate the pull drive motor to retrieve excess wire. This closed-loop feedback control eliminates wire deformation issues while allowing the use of cost-effective variable torque motors in many operating conditions.
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 torque-managing device reduces the cost of upgrading existing systems and allows for flexible operation, preventing wire deformation and bunching, enhancing the reliability and efficiency of wire feeding in various welding applications.
Implementation Method 1
a first moving part (504) configured to rotate with the actuator driveshaft (408). A slip surface (516) is provided on the first moving part (504). A second moving part (502) is received on the actuator driveshaft (408) but is free to rotate relative to the actuator driveshaft (408). The second moving part (502) includes a driving gear (416). Friction material shoes or pads (506a-506c) face the slip surface (516).
Data Source
Figure 1a
Figure 1b
Figure 1c
AI summary
A wire conveying mechanism (12), preferably for a welding, cladding or additive manufacturing apparatus, with a slip clutch mechanism (42) connectable to a motor. Such a wire conveying mechanism may include a wire feeder (108) for feeding an electrode wire (314) in a welding system having a drive roller assembly (402) comprising a plurality of drive rollers to grip the electrode wire and to pull the electrode wire from an electrode wire source toward a conduit and a torque-managing device operatively coupled between a motor and the drive roller assembly, wherein the torque-managing device (406) receives the rotational force from the first motor and regulates the first torque to output a second torque to the drive roller assembly.