Main Structure of the Fixture

The commonly seen detection fixtures have a multi-layered pressing structure, which includes an upper pressing plate, a fixing plate, a product supporting plate, and a sealing plate. The mobile phone middle frame is placed in the specific accommodating area of the supporting plate. With the help of a sealing ring (such as the first sealing ring), the detection area and the non-detection area are divided, ensuring that during the testing process, the pressure is only applied to the target area.

Sealing Structure: Relying on the coordinated operation of the pressing device (such as the upper pressing plate and the fixing plate), the sealing ring is pressed tightly to construct a closed space, effectively preventing the leakage of the testing medium.

Detection Medium and Methods

Air Tightness Detection Approach: By using an air tightness detector, the middle frame is inflated or deflated through positive pressure, negative pressure, or differential pressure methods. The sealing performance is judged by monitoring the gas leakage volume.

Water Tightness Detection Method: Some detection devices use water as the detection medium (such as the HW True Water Detector). After pressurization, the waterproof ability of the middle frame is evaluated by observing whether there is water seepage or measuring the leakage value.

Detection Process and Related Parameter Settings

Steps of the Standard Detection Process

Pressurization Stage: Generally, the inflation pressure is set in the range of 30 to 50 kPa, and the inflation time is approximately 5 seconds.

Stabilization and Testing Stage: The stabilization time lasts for 5 seconds, and the testing time is also 5 seconds. During this period, the pressure change is recorded by a sensor.

Leakage Judgment Criteria: According to the pre-set leakage threshold (for example, ≤100 Pa/s), the device automatically determines whether the detection result is qualified.

Embodiment of Automation Level and Detection Efficiency

Efficient detection equipment can complete the detection of about 171 middle frames per hour, which significantly improves the efficiency compared with the traditional soaking detection method.

The equipment integrates PLC and servo drivers, effectively ensuring the high precision of the detection process and the repeatability of the results.

Industry Application Fields and Remarkable Advantages

Analysis of Technical Advantages

High Reliability Guarantee: The air tightness detector is controlled by a microcomputer, which greatly reduces the errors caused by human factors and makes the detection results more objective and reliable.

Outstanding Cost-effectiveness: There is no need to use helium, nor is there a need for drying treatment. The single detection cycle is relatively short (about 21 seconds), which reduces the overall detection cost.

Good Compatibility Performance: It can support the development of customized molds, be adapted to different models of mobile phone middle frames, and can be connected to the MES system to achieve effective data management.

Innovative Technical Achievements and Future Development Trends

Progress of Intelligent Upgrades

Some patented technologies (such as the relevant technologies of the waterproof middle frame of Yingtan Pulisheng) integrate a gas storage tank and a contact alarm, which can monitor the sealing performance of the middle frame in real time and promptly feedback information to users.

With the development of technology, it is expected to combine with AI algorithms in the future to achieve real-time data analysis and predictive maintenance functions.

Situation of Standardization and Specification Construction

The formulation of industry standards such as the "Waterproof Performance Test of Electrical and Electronic Products - Air Pressure Method" has effectively promoted the development of the detection process towards standardization.

The water tightness detection fixture for mobile phone middle frames has successfully overcome the problems of low efficiency and poor reliability of traditional detection methods through its precise structural design and automation technology. Its core lies in combining the high efficiency of the air tightness detector with the good adaptability of customized fixtures, and it is continuously moving towards the direction of intelligence and standardization. BOLYFA has already launched a mature solution that can meet the full-process needs from production to maintenance.