Handheld Plastic Welding Device with Depth-Limiting Spacers
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Solution Overview
Problem
Car workshops lack affordable and effective means to securely attach sensor brackets to plastic bumpers, as they do not have access to expensive ultrasonic welding equipment, leading to insecure glue-based attachments that often fail.
Innovation Solution
A hand-held plastic welding device with a welding head and spacers that limits penetration depth, allowing for secure, planar connections of thin-walled plastic parts without the need for expensive equipment, using a handle and spacers to ensure stability and prevent large-area melting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ultrasonic welding equipment is used, then welding strength is improved, but device cost and complexity increase
Solution Approach 1:
The patent replaces expensive, complex ultrasonic welding equipment with a simple handheld welding iron that can be easily manufactured and disposed of. The welding iron uses basic heating elements rather than sophisticated ultrasonic mechanisms, making it affordable for typical automotive repair shops while achieving sufficient welding strength for sensor bracket attachments.
Solution Approach 2:
The patent substitutes the mechanical ultrasonic vibration system with a thermal heating system. Instead of using ultrasonic waves to melt and join plastics, the invention uses a heated iron tip to melt the plastic surfaces, allowing them to bond when pressed together. This substitution dramatically simplifies the equipment while maintaining welding effectiveness.
2Strength
If welding tip penetration depth is increased, then welding strength is improved, but risk of large-area melting and damage increases
Solution Approach 1:
The patent employs spacers with locally optimized geometries that concentrate the welding heat precisely at the interface between the sensor bracket and bumper. The spacers ensure the welding iron contacts only the specific area needing welding, preventing heat from spreading to surrounding plastic regions. This localized heat application achieves strong bonds without causing large-area melting or damage to the bumper surface.
Solution Approach 2:
The patent introduces spacers as intermediary elements between the welding iron and the plastic surfaces. These spacers serve multiple functions: they position the welding iron at the correct height, limit penetration depth to prevent through-melting, and concentrate thermal energy at the welding interface. The spacers act as a mediating structure that enables effective welding while protecting surrounding areas from thermal damage.
3Strength
If penetration depth is not limited, then welding strength is improved, but control over welding process is reduced
Solution Approach 1:
The patent incorporates spacers that are pre-configured with specific thicknesses and geometries designed to limit penetration depth before the welding process begins. These spacers are attached to the sensor bracket in advance, establishing a predetermined stop point for the welding iron. This preliminary action ensures consistent, controlled penetration depth across all welding operations without requiring real-time operator judgment or complex control 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
Enables secure, cost-effective attachment of sensor brackets to plastic bumpers, providing a strong and durable connection that withstands use, without the need for expensive ultrasonic welding equipment.
Implementation Method 1
the at least one welding tip is pressed with the at least one welding tip through the thin-walled area of the first plastic part into the second plastic part until its base body rests on the spacers. The spacers are designed in such a way that only a predetermined maximum penetration depth of the welding tip is permitted
Implementation Method 2
the spacers are designed in such a way that when the base body is laterally supported on the spacers, a penetration depth of the at least one welding tip into the plastic parts to be connected is limited to a predetermined maximum value
Data Source
Figure 1~6
Figure 7~9
Figure 10~12(b)
AI summary
The invention relates to a plastic-welding device for connecting a first, thin-walled plastic part (6) to a second plastic part in a planar manner, comprising a hand-held mounting aid (1) and a welding head (2) that can be held in a retainer of a hand soldering iron; wherein the welding head (2) has a main body (3) and at least one welding tip (4) arranged on the main body (3); wherein the mounting aid (1) has at least one spacer (5), which can be placed onto the thin-walled plastic part (6) by means of an underside of the at least one spacer and on the surface of which the main body (3) of the welding head (2) can be supported; and wherein the at least one spacer (5) is designed in such a way that, when the main body (3) is supported on the at least one spacer (5), a depth of penetration of the at least one welding tip (4) into the plastic parts to be connected is limited to a predetermined maximum value.