The successful dispensing of the automatic glue dispenser depends on the proper flow path of the colloid, and all the wetting parts from the rubber tube to the point glue needle do not contain bubbles. The bubble is the root cause of the inconsistency between the drawing, the dripping, the cavity of the glue point and the change of the weight of the glue point. Bubbles are usually produced in the flow path that is injected into the colloid during the replacement of the hose and the filling process.
So when replacing the hose, be careful not to introduce the air into the colloid channel. If there is air in the hose, and you are sure that the air does not enter the glue pump through the hose, please replace the hose according to the following steps:
Turn off the glue machine, open the door, unload the cooling jacket from the hose, unload the pressure head, and dismantle the hose. Please confirm that the elbow fittings at 90 degrees are attached to the glue valve. After the rubber tube is unloaded, a small cavity will be produced at the bottom of the locking head of the glue valve. Please use the colloid in the old hose to fill the cavity and check whether there is a bubble in the locking head. If there is a bubble, please use the new hose to fill the cavity and check whether the new rubber hose has bubbles. If there is a bubble, use another hose.
Remove the cap of the new hose, keep the end of the hose down, fill the bottom of the hose completely, connect the hose and the glue valve, and lock the switch head. If the colloid is overflowed to the accessories, wipe it clean. Reinstall the pressure head. Reinstall the hose cooling jacket. Turn off the glue door and restart the equipment.
In addition, there should be enough time to discharge the gel, so that the colloid in the new hose will flow out smoothly. The pressure and speed of the dispensing valve should be determined according to the ideal state, and then the colloid flow rate should be measured. Until the error of two consecutive measurements is within the range of positive and negative 2%.
If there are the following conditions, do not use simple rubber hose replacement method:
In the operation of the automatic glue dispenser, the glue in the hose has been used up, and in this case, there is a very likely presence of air in the dispensing valve. The rubber material in the rubber hose has passed the service life. If any of the above occurs, the operator must thoroughly clean and dry the dispensing valve or dispensing pump, and follow the configuration steps.