Can you handle the 8 common faults of automatic dispensing machines?

1. UV glue (UV curing glue):

Make sure to use black pipes. Do not directly add UV glue to the existing UV glue in the pressure cylinder. First, release the original UV glue, and then pour the UV glue into the empty pressure cylinder The UV glue inside the pressure cylinder often generates bubbles after a period of time, causing unstable glue output.

2. Needle:

Generally speaking, needles smaller than size 20 may cause air problems such as dripping or sagging. Try to use larger metal needles or tapered angled needles.

3. The flow rate of the automatic dispensing machine is too slow:

If the flow rate is too slow, the pipeline should be changed from 1/4 "to 3/8". If there is no need, the pipeline should be as short as possible. In addition to modifying the pipe, it is also necessary to modify the rubber outlet and air pressure to completely increase the flow rate.

4. Bubbles in the fluid:

Excessive fluid pressure combined with too short valve opening time may allow air to seep into the liquid. The solution is to reduce fluid pressure and use a conical angled needle.

5. Cleaning of epoxy resin:

If possible, try to automatically clean each Shift using a storage pressure cylinder with regular toluene solvent, the more frequently the cleaning, the better.

6. Automatic glue dispensing machine valve leakage:

This situation often occurs after the pre glue valve is closed. 95% of this situation is due to the use of needles with a small diameter. A needle that is too small can affect the flow of liquid and cause back pressure, resulting in dripping shortly after the rubber valve is closed. A too small needle can also affect the exhaust bubble action of the rubber valve when it is first used, and this problem can be solved by replacing it with a larger needle. The conical inclined needle produces the least back pressure and the smoothest liquid flow.

After the rubber valve is closed, the air inside the liquid will drip. It is best to eliminate the air inside the liquid in advance, or use a rubber that is less likely to contain bubbles, or centrifuge the rubber to remove bubbles before use.

7. Inconsistent dispensing size of automatic dispensing machine:

When the adhesive is inconsistent, it is mainly caused by the unstable pressure of the pressure cylinder or air that stores the fluid.

The intake pressure regulator should be set at a pressure 10 to 15 psi lower than the minimum pressure in the factory. The pressure used by the pressure cylinder should be above the middle pressure of the regulator, and it should be avoided to use a pressure between the low pressure part of the pressure gauge. The control pressure of the glue valve should be at least 60psi to ensure stable glue dispensing. Finally, the adhesive release time should be checked If it is less than 15/1000 seconds, it will cause unstable glue dispensing. The longer the adhesive time, the more stable the adhesive will be.

8. Instant glue (quick drying glue) blocks the glue valve joint and pipeline:

This situation is mainly due to excessive moisture or repeated use of instant glue. It should be ensured that fresh instant glue is used, and the pipeline should be thoroughly cleaned with acetone free of moisture. The air used should be dry and a filter should be installed between the factory air pressure and the glue valve system (if the above methods are still ineffective, nitrogen should be used).