Who guarantees a display cabinet door opened hundreds of times a day? A million-cycle tester driven by rotary cylinders

Model: NL-KGM2

The problem

Refrigerator, freezer and display cabinet doors are large and heavy, in single, double and side-by-side layouts. Because the gasket pulls hard, any gripper with lateral thrust will pull the door off its hinges within tens of thousands of cycles. Manual testing of a large fridge takes two people and records neither cycle count nor force. A store-front cabinet is opened all day, so hinge and gasket life must be proven with million-cycle data.

Capability

A rotary cylinder of 125mm bore (750W power equivalent) drives the arm about the door axis with pure rotation and no lateral thrust, so the door is not pushed off its hinges. The tester covers single and double doors of large and small refrigerators, freezers and display cabinets, and the double-door version exercises both leaves at once. Samples from 700 to 1400mm are held by aluminium sleeve fixtures with pins and quick straps, about 25 kg in total. Opening angle is 0-135 degrees and speed 0-10 cycles per minute, both set on the HMI, with the cycle counter settable up to 1000000. During powered cycles a current sensor watches the sample, while a photoelectric sensor checks door state - a door that fails to open or fails to close (dropped hinge or loose grip) is flagged immediately. Changing between left and right doors is a matter of re-orienting the pneumatic fingers and the arm output shaft, with no modification to the machine body. A booster pump at 0.6-1.2MPa keeps grip pressure stable, and several units can run side by side without interference.

Key specifications

• Application: open-close endurance of refrigerator, freezer and display cabinet doors
• Drive: rotary cylinder, 125mm bore, 750W power equivalent
• Door types: single, double and side-by-side doors
• Sample range: 700-1400mm, aluminium sleeve fixtures about 25 kg
• Opening angle: 0-135 degrees set on HMI
• Cycle speed: 0-10 per minute
• Cycle count: 0-1000000 settable
• Door state: photoelectric sensor, auto judgement of not-open and not-closed
• Live monitoring: current sensor during powered cycles
• Gripping: pneumatic fingers on sliding coupling, no lateral thrust
• Left and right door change: re-orient fingers and arm output shaft
• Air supply: booster pump 0.6-1.2MPa

Applications

Door system endurance verification at refrigerator, freezer and display cabinet plants; durability sampling for commercial refrigeration brands; hinge and gasket supplier qualification; third-party door endurance testing for household refrigerating appliances

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.