Dual-Motor Riveting Tool Mandrel Control
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Solution Overview
Problem
Existing riveting tools for blind rivet elements require complex mechanical designs and energy-consuming slip clutches, limiting versatility and efficiency, particularly in battery-operated tools, and are not adaptable to different thread sizes or materials, leading to overloading and increased tool weight.
Innovation Solution
A riveting tool with two independent motors, one for rotary movement and another for pulling movement, allowing for simplified mechanical structure and adaptable operation with different blind rivet elements, including right-hand and left-hand threads, using a spindle nut and hollow spindle for axial movement, and controlled via electrical parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed speed rotary motion is used for screwing blind rivet elements, then the mechanical design is simplified, but different thread sizes cannot be accommodated and work cycle is extended
Solution Approach 1:
The first motor's rotational speed is made dynamically adjustable through electronic speed control, allowing the system to optimize rotation speed based on the specific blind rivet element being installed. This enables faster screwing for certain thread sizes while maintaining precise control for others, reducing overall work cycle time without adding complex mechanical speed variation mechanisms.
Solution Approach 2:
The rotational speed parameter of the first motor is made variable rather than fixed, allowing adjustment according to different blind rivet element specifications. This parameter change enables the system to adapt to different thread sizes and materials, optimizing the screwing process for each application and reducing work cycle time.
2Ease of operation
If a slip clutch is used to switch between rotary and pulling motions, then motion switching is achieved, but energy is consumed and battery life is reduced
Solution Approach 1:
The power transmission path is segmented into two independent paths, each driven by its own motor. The first motor drives rotary motion through a first transmission mechanism, while the second motor drives pulling motion through a second transmission mechanism. This eliminates the need for energy-consuming slip clutch mechanisms to switch between motions, as each motor independently provides its required motion type without needing to engage or disengage from the other.
3Manufacturing precision
If stroke-controlled mandrel retraction is used, then consistent retraction distance is achieved, but manufacturing tolerances cannot be accommodated and thread overloading occurs
Solution Approach 1:
A sensor detects the position of the mandrel during retraction, providing feedback to the control unit. The control unit monitors this position data and dynamically adjusts the second motor's operation to achieve the optimal retraction distance for each specific blind rivet element, accommodating manufacturing tolerances while preventing thread overloading. This feedback mechanism replaces rigid stroke control with adaptive position-based control.
4Weight of moving object
If a single motor system is used, then the overall device weight is reduced, but the mechanical structure becomes more complex and heavier components are required
Solution Approach 1:
The single motor system is divided into two smaller, specialized motors that can be independently optimized for their specific functions. This segmentation allows each motor to be more compact and lighter than a single motor attempting to perform both rotary and pulling functions, while the simplified transmission mechanisms required by each motor further reduce overall weight despite the increased structural complexity of having two separate drive systems.
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 reduces mechanical complexity, conserves energy, and allows for adaptable operation with various blind rivet elements, enhancing efficiency, reducing tool weight, and enabling precise control without the need for position limit switches, thus optimizing the work cycle and extending battery life.
Implementation Method 1
a first motor is provided with which the rotary movement can be introduced into the mandrel via a first operative connection with the mandrel comprising a mandrel shaft extending in a mandrel axis
Implementation Method 2
a second motor is provided with which, via a second operative connection with the mandrel comprising a hollow spindle, the pulling movement can be introduced into the mandrel to introduce at least partial plastic deformation into the blind rivet element
Implementation Method 3
the pulling movement can be introduced into the mandrel to introduce at least partial plastic deformation into the blind rivet element
Data Source
Figure 1
AI summary
The invention relates to a riveting device (1) and to a method for operating a riveting device (1) for setting blind rivet elements, namely blind rivet nuts and/or blind rivet screws, said device having a mandrel (10), to which a rotational movement can be transmitted for screwing said mandrel into the blind rivet element, and which can be retracted into the riveting device (1) by a tractive movement for at least partial plastic deformation of the blind rivet element. According to the invention, a first motor (11) is provided, with which the rotational movement can be transmitted to the mandrel (10) by way of a first operative connection to the mandrel (10), and a second motor (12) is provided, with which the tractive movement can be transmitted to the mandrel (10) by way of a second operative connection to said mandrel (10).