Pressure-Cleaning Spray Lance with Asymmetric Detachment Forces
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Solution Overview
Problem
Existing pressure cleaning devices face the challenge of unintentional detachment of connecting devices, leading to potential misalignment and inefficiency in cleaning operations.
Innovation Solution
The spraying device is designed with different detachment forces for the base and head connection devices, ensuring that the head connection device detaches first with a smaller force, thereby preventing unintentional detachment of the lance from the base body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the base connection device and head connection device are designed with the same detachment force, then both connection devices can be detached with equal ease, but the lance may be unintentionally detached from the base body during routine maintenance or operation changes
Solution Approach 1:
The patent applies local quality by assigning different detachment forces to different connection devices. The base connection device is designed with a higher detachment force than the head connection device, creating localized differences in detachment characteristics. This ensures that the head connection device detaches first during routine maintenance, preventing unintentional detachment of the lance from the base body while maintaining ease of operation for both connections.
2Reliability
If the head connection device is designed with a higher detachment force than the base connection device, then the base connection is more secure, but the spraying head cannot be easily detached during maintenance
Solution Approach 1:
The patent resolves this contradiction by applying local quality differently. Instead of making the base connection stronger, it makes the head connection weaker (lower detachment force). This localized differentiation allows the head connection device to detach easily during maintenance while the base connection maintains adequate security for holding the lance to the base body.
Solution Approach 2:
The patent segments the detachment force property across different connection devices. By dividing the overall connection system into two segments with different detachment characteristics (head connection with lower force, base connection with higher force), it enables selective detachment behavior that satisfies both ease of maintenance and connection security requirements.
3Ease of operation
If the base connection device is designed with a lower detachment force, then it is easier to detach the lance from the base body, but the lance may be unintentionally detached during normal operation
Solution Approach 1:
The patent applies local quality to create asymmetric detachment forces. The base connection device is designed with a higher detachment force than the head connection device. This localized difference in detachment characteristics ensures that during normal operation or routine maintenance, the head connection device detaches first (with lower force), preventing unintentional detachment of the lance from the base body while still allowing easy detachment when intended.
Data Source
AI summary
A spraying device for a pressure cleaning device (1) includes a base body (10), a spraying head (20) with a spraying opening (21) through which cleaning fluid can be sprayed, a lance (30) which can be arranged between the base body (10) and the spraying head (20), a base connection device (40) by which the lance (30) can be detachably connected to the base body (10) and a head connection device (50) by which the lance (30) can be detachably connected to the spraying head (20). The cleaning fluid can be conveyed from the base body (10), in particular through the lance (30), to the spraying opening (21). The base connection device (40) can be detached with a base detachment force. The head connection device (50) can be detached with a head detachment force. The base detachment force and the head detachment force are of different magnitude.