The problem

Leaking heating tubes are only found after they are built into the appliance, causing water leakage, after-sales rework and high cost; manual air leak checks give unstable pressure and subjective judgement; single-station testing cannot keep up with the line; and the leak point is hard to locate for marking and rework.

Capability

Dedicated non-standard machine for air-tightness testing of heating tubes. Six chambers pressurised independently without mutual interference; test pressure 0.3-0.9MPa adjustable, 0-200s settable, six stations with fixtures tested simultaneously and stations 1-6 selectable; flow: load tube into the mould, six-direction clamping cylinders seal the part, water-tank cylinder lowers to submerge the flange port, solenoid valves open and the sealed chamber is pressurised, automatic leak judgement by pressure change plus visual bubble check as double assurance; independent 0.5-class precision differential pressure sensor, precision regulator and gauge per station; pass shows green light, fail shows red light with automatic pass/fail counting; a leaking part stays pressurised until the cancel button releases pressure, making the leak point easy to mark for rework; chamber bore 400x180x600mm per station with eccentric mould port accepting eccentric-250mm shaped tubes or tubes up to 600mm long; air-hydraulic cylinders by six, hydraulic power unit, five fixture sizes 30 sets, external SUS304 water tank approx. 600x1200x750mm; PLC with A/D module and 7-inch Weiluntong colour touch screen; leakage and emergency-stop protection; frame approx. 1650x880x1750mm excluding 700mm cylinder height, AC220V/50Hz.

Key specifications

• 工位配置：6工位配夹具同时测试，可勾选1～6号工位单独测试；六腔独立加压互不干扰
• 试验压力：0.3～0.9MPa可调；测试时间0～200s可设置
• 判定方式：压力变化自动判定是否漏气+下水淹没目测气泡人工判定，双保障
• 压力测量：每工位独立0.5级精密泄压压差压力传感器；每工位独立精密调压器与压力表
• 测试流程：压紧油缸六方向压紧→水箱气缸下降淹没法兰端口→加压→自动判定→升降取件，按启动键自动按顺序执行
• 结果输出：合格亮绿灯、不合格自动亮红灯；自动记录统计合格数与不合格数
• 泄漏定位：漏气产品保持保压充气状态，人工取消键后泄压，便于判别泄漏点做标记返工
• 模具规格：每工位独立气密腔体规格内400×180×600mm；模具口偏心设计，可装偏心250mm异形管或最长600mm管
• 主要配置：气液缸6台；液压站1台；配套模具5种规格共30套；外置304水箱（约600×1200×750mm）；气密性箱（定制）6套
• 控制系统：PLC控制（进口PLC+A/D采集模块）；7寸彩色触摸屏（威纶通）

Applications

Factory air-tightness inspection of heating tubes for electric water heaters, washing machines and small appliances; incoming inspection and supplier audits of tubular heaters; sampling of flange weld sealing; seal testing of electric heating elements at quality institutes

About the manufacturer

Guangdong Endurance Electronic Equipment Co., Ltd provides non-standard customization, drawing confirmation, factory acceptance, on-site installation and commissioning, operation training and lifetime technical service; 12-month warranty and lifetime spare parts supply. Tel: 0760-88500902 / 13416787649. Web: en.zsnaili.com.