Model: NL-KFCSQ-4
The problem
The brew group is the throat of a coffee machine: a seal that fails at low pressure weeps during pre-infusion, and one that cannot hold high pressure dribbles from the distribution spout at 9bar. On the line the part is pressed by hand and judged by eye; covering both pressure zones takes two or three re-fittings per piece, and a leak found on a finished machine costs more rework time than inspecting ten pieces properly.
Capability
The rack judges the two zones separately. Zone 1 holds 0-5bar with no flow to prove the closed state of the valve core; zone 2 holds 5-20bar with no leak to prove the working pressure zone - both must pass. Each of the four stations carries its own 0-25bar gauge for direct reading and its own KLH clamping cylinder with stable force, so repeated clamping never seats off-centre. Stations are controlled and judged independently, so one operator watches all four. Water filling, internal-leak and external-leak times are settable 0-99.99s per zone, with a 0-999999 cycle counter. Feed water passes a PP filter and regulator adjustable over 0.1-2.0MPa, so the medium never damages sealing faces. After the test the pressure releases automatically before the fixture opens, eliminating sprays from opening under load. The brew group is 80mm diameter by 62mm, held in quick-change aluminium blocks - a model change swaps blocks only, never hoses. Takt is 20-30s per piece, about 500-570 pieces per hour across four stations.
Applicable standards
The assessment follows the structural safety clauses of Chapter 22 of GB 4706.1 General requirements for household and similar electrical appliances and GB/T 4706.19-2024 for liquid heating appliances; the 0-5bar and 5-20bar zone values, hold times and leak criteria follow the customer technical agreement and the brew group drawing.
Key specifications
- Stations: 4, independent control and judgement
- Test piece: brew group (brew head), 80 x 62mm diameter
- Pressure display: 0-25bar gauge per station
- Zone 1: 0-5bar hold, no flow (valve core closed)
- Zone 2: 5-20bar hold, no leak (working zone)
- Timing: water filling, internal leak, external leak each 0-99.99s
- Cycles: 0-999999 settable
- Feed water: PP filter plus regulator, 0.1-2.0MPa adjustable
- Clamping: KLH pneumatic cylinder, stable adjustable force
- Fixture: quick-change aluminium blocks (replaceable)
- Relief: automatic release before the fixture opens
- Structure: bench-type 4 stations, drip tray and drain, splash-proof top
- Air supply: 0.5-0.8MPa clean compressed air
Applications
Incoming inspection and line sampling of brew groups at coffee machine plants; shipment inspection at brew group suppliers; re-judgement of returned parts and new-model validation
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 long-term technical service; 12-month warranty and long-term spare parts supply. Tel: 0760-88500902 / 13416787649. Web: en.zsnaili.com.