The nozzle is an important factor affecting the placement rate
The nozzle of the placement machine is an important factor affecting the placement rate, and the causes are divided into internal and external causes.
1: Internal reasons
On the one hand, the vacuum negative pressure is insufficient. Before the suction nozzle picks up the parts, the mechanical valve on the placement head is automatically switched, and the blowing is converted to real suction, which generates a certain negative pressure. When the parts are sucked, the negative pressure sensor detects a certain value. When in the range, the machine is normal, otherwise the suction is bad. Generally, the negative pressure at the suction nozzle from the pick-up position to the placement position should be at least 400mmHg or more. When mounting large components, the negative pressure should be more than 70mmHg. Therefore, the filter in the vacuum pump should be cleaned regularly to ensure sufficient negative pressure; At the same time, the working status of the negative pressure detection sensor should be checked regularly. On the other hand, the filter on the placement head and the filter on the suction nozzle become black due to contamination and clogging due to the surrounding environment or the impure air source. Therefore, the filter should be replaced regularly. Generally, the filter on the suction nozzle should be replaced at least once every half a month, and the filter on the placement head should be replaced at least once every half a year to ensure unobstructed air flow.
2: External reasons
On the one hand, it is the pressure relief of the air source circuit, such as the aging and rupture of the rubber air pipe, the aging and wear of the seal, and the wear of the suction nozzle after long-term use. On the other hand, it is due to the adhesive or dust in the external environment, especially the paper tape packaging The large amount of waste generated after cutting off of the components causes the suction nozzle to be blocked. Therefore, because the cleanliness of the suction nozzle is checked daily, the pickup of the suction nozzle is monitored at any time, and the clogged or poorly picked suction nozzle should be cleaned in time Or replace it to ensure good condition. At the same time, when installing the smt nozzle, it must be installed correctly and firmly, otherwise it will cause damage to the nozzle or equipment.
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