Nowadays, the electronic and mechanical industries are expanding rapidly, and more and more components are needed for machinery, such as the use of pressure sensors, which are widely used in various fields. Pressure sensors and sensor housings generally need to be grounded, signal cables should also be grounded and not mixed with power cables, and sensors and differential pressure sensors should avoid strong electromagnetic interference. Sensors and sensors should be checked regularly according to industry regulations.
Component blockage or incorrect installation method, unreasonable pressure point.
Pressure primer leakage or blockage, residual gas in the filling tube or liquid in the inflation tube, sediment in the sensor process flange, forming a measuring dead zone.
Incorrect sensor wiring, too high or too low power supply voltage, poor contact between indicator head and external wiring terminal.
Equipment is not operated in strict accordance with skill requirements, and equipment methods and site environment do not meet skill requirements.
Be careful when cleaning
Before using a wire brush or compound to clean the extruder barrel, remove all sensors. Both of these cleaning methods may damage the vibration membrane of the sensor. When heating the cylinder, the sensor should also be removed and the top wiped with a soft cloth that will not cause wear and tear. A clean drill bit and sleeve should also be used to clean the holes on the sensor.
Although the sensor circuit design can withstand harsh extrusion processing environments, most sensors are not waterproof and are not conducive to normal operation in humid environments. Therefore, it is necessary to ensure that the water in the extruder barrel body water cooling device will not leak, otherwise it will have a negative impact on the sensor. If the pressure sensor must be exposed to water or humid environments, choose a highly waterproof sensor.
Choose the right location
When the pressure sensor is installed too close to the upstream of the production line, the unfused material may wear the top of the sensor; if the sensor is installed too far back, a stagnant area of molten material may be formed between the sensor and the screw stroke, and the molten material may degrade here and cause the pressure signal to be distorted; if the sensor is too deep, the screw may touch the top of the sensor during the rotation process and damage the sensor. Generally, the sensor can be located in front of the filter cartridge, before or after the melt pump, or inside the mold.
Keep the installation hole clean
Keeping the installation hole clean and preventing molten material from blocking is an important link to ensure the normal operation of the equipment. Before cleaning the extruder, all pressure sensors should be removed from the barrel to prevent damage. When removing the sensor, the melt may flow into the installation hole and harden. If these residual molten materials are not cleaned, the top of the sensor may be damaged when the sensor is reinstalled. A cleaning tool can be used to clean these molten residues. However, repeated cleaning procedures can aggravate the damage to the installation hole caused by the sensor. If this happens, measures should be taken to lift the pressure sensor into the installation hole.
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