8 main problems and solutions when using dispensing machines
Compared to manual dispensing, dispensing machines are not only efficient but also accurate. Usually, high-quality dispensing machines have stable performance, but some machines may encounter some problems in the course of use. If we can analyze the causes of these problems and find solutions ourselves, they will be able to use the dispensing equipment more smoothly and powerfully reduce the time it takes to find a professional to solve the problem. The following article lists a few common issues with dispensing machines and gives solutions.
Glue dripping from valves
Causes: The valve drips glue due to the use of a needle of too small an aperture. A needle that is too small affects the flow of the liquid causing back pressure, which results in a drip shortly after the valve is closed. It will also affect the bubble removal action when the valve is started.
Solution: Try to use larger general metal needles or smooth flow tapered needles, avoid flexible tips or Teflon-line mental needles. The smooth flow tapered needle produces the least back pressure and the smoothest flow of liquid. Air in the liquid can cause dripping after the valve has been closed. It is best to remove the air from the liquid beforehand or to use glue that does not easily contain air bubbles.
No glue coming out of the glue outlet
Reason: The automatic dispensing machine is not completely cleaned inside the pinhole. Or impurities are mixed in the dispensing glue. Or incompatible glue mixed. All of the above problems can lead to the glue nozzle being blocked and no glue flowing out. If you are using cyanoacrylate, there also is no glue flow. This is mainly due to excessive moisture or reused cyanoacrylate.
Solution: Replace the needle with a clean one. Alternatively, replace it with a better quality patch adhesive. Note that the type of patch adhesive should not be mistaken. If the glue does not flow out after using the above methods, you should check whether the air pressure of the dispensing machine is normal and whether the program is set correctly. If you are using cyanoacrylate, ensure that fresh cyanoacrylate is used. The lines are thoroughly cleaned with acetone without moisture, the air used is completely dry and a filter is installed between the factory air pressure and the glue valve system. If the above does not work, nitrogen should be used.
The flow rate of the glue out is too slow
Cause: The pipe connecting the pressure barrel to the glue outlet is too long or too narrow and the air pressure at the mouth of the line is insufficient, resulting in a slow dispensing flow rate.
Solution: If there are no special requirements, the shorter the dispensing pipe, the better. In addition to replacing the pipes, increase the air pressure appropriately so that the flow rate is completely accelerated.
Air bubbles in the dispensing liquid
Cause: Excessive fluid pressure combined with a short opening time may allow air to seep into the fluid. Or air gets in when the glue is changed.
Solution: Reduce fluid pressure and use a smooth flow tapered needle. By the way, the air should be evacuated from the joint each time the glue is changed midway to prevent the appearance of some products without glue on them.
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Different flow rates of glue out
Cause: Inconsistent dispensing is caused by unstable pressure in the pressure cylinder or in the air where the fluid is stored. If you are using UV glue and this phenomenon has occurred. That's because the UV glue in the pressure cartridge tends to produce bubbles after some time and causes unstable glue output.
Solution: The inlet pressure regulator should be set 10 to 15 psi below the factory minimum pressure and the pressure cylinder should be used at a pressure above the middle of the regulator. The control pressure of the glue valve should be at least 60 psi to ensure a stable glue output. Finally, check the glue output time. The longer the glue output time, the more stable the glue outlet will be. If you are using UV glue. Reduce fluid pressure and use a smooth flow tapered needle. By the way, the air should be evacuated from the joint each time the glue is changed midway to prevent the appearance of some products without glue on them.
Glue stringing during dispensing
Causes: The inner diameter of the glue nozzle is too small, the dispensing pressure is too high, the amount of glue dispensed is too large, etc. When the glue head is opened, there is a distance between the glue head and the glue valve. If the dispensing machine starts dispensing immediately, there may be no glue in the middle, and the phenomenon of stringing will occur.
Solution: Replace the suitable accessories and find the right setting parameters. Or open or close the glue outlet in advance.
After dispensing, the machine does not return to the home position accurately
Cause: The sensor may not be detecting the signal. Or there is a problem with the driver. The last point is that the return speed in the parameter setting is too small.
Solution: If the sensor light is not on, just adjust the position so that it can sense the signal and check if the sensor wire is off. If the driver indicator does not light up, check if there is a problem with the rectifier fuse. Check the bottom left of the touch screen to see if the home position is always displayed, to speed up the return to the home position.
The motor of the dispensing machine does not turn
Cause: The program is not set properly. Or the motor is seriously hot. Maybe the motor cable has fallen off.
Solution: Check that the program settings and motor cable are not disconnected. If the machine is seriously hot, it is recommended to switch off the power supply to feedback to the manufacturer.
Conclusion
When using dispensing machines, we encounter a variety of problems. When you encounter a problem, don't panic and don't rush to replace the dispenser. Just find the corresponding solution to your problem in this article and you will be able to solve it. When you need more information about this, feel free to contact me via [email protected].