How to judge whether the vacuum pressure of injection molding manipulator is normal?

I'll give you a set of the fastest and most practical method on the spot, which can be judged without instruments. Injection molding workers and machine repairers can just follow it directly.

First, remember: normal vacuum pressure range

Vacuum (sucker) commonly used for picking up parts by injection molding manipulator;

Normal working vacuum:-0.06 ~-0.08 MPa (-60 ~-80 kPa)

The lower alarm limit is generally -0.05 MPa(-50 kPa).

Below this value, the vacuum is insufficient.

Two or four methods to judge whether the vacuum is normal (from simple to professional)

1. Look at the vacuum gauge/touch screen (the most direct)

After the sucker absorbs the product, it is stable at-60 ~-80 kPa → normal.

Always below -40 kPa → Insufficient vacuum.

Vacuum does not go up and fluctuates greatly → air leakage/blockage.

2. See if there is an alarm (the most worry-free)

Most manipulators have vacuum detection:

If the set negative pressure is not reached within a few seconds after taking the parts → call the police.

Frequent reporting of Vacuum alarm/vacuum abnormality → definitely abnormal.

Pick-up time is good or bad → vacuum criticality is insufficient.

3. Look at the product status (you can judge without a watch)

Suction is stable, does not shake, does not drop → vacuum is normal.

The product shakes, deviates, falls → lack of vacuum during the pickup.

There is obvious sucker printing and suction deformation on the surface of the product → the vacuum is too large (also lower).

4. Manual test method (most commonly used for machine maintenance)

Manually let the suction cup suck the clean plate.

Observe whether the vacuum gauge can quickly reach about -70kPa.

Turn off the air valve and keep the pressure for 5 ~ 10 seconds;

The pressure hardly drops → normal.

Falling fast → Suction cup/air pipe/joint leaks.

Three, four typical manifestations of abnormal vacuum

Slow vacuum → the trachea is too long, the filter is blocked, and the suction cup is hardened.

The vacuum can't go up, and it is always low → the suction cup is damaged, the product is uneven, and air leaks.

The vacuum is high and low → the joint is loose, the trachea is flattened, and the suction cup is uneven.

Alarm as soon as it is sucked → the vacuum switch is too sensitive, or the air leakage area of the product is large.

Fourth, quickly judge the formula (it is enough to remember this on the spot)

It's normal for the hands of the watch to be steady at 60% to 70% and not to drop or sway.

As soon as it is sucked, the vacuum will drop, either leaking or loosening.

The product is deformed, and the pressure is too high, so it should be lowered.