In automated process manufacturing, dispensing machines are one of the core devices in the production chain, with a wide range of applications covering electronic assembly (such as PCB dispensing and packaging), automotive manufacturing, medical devices, and more. They have become an indispensable key component in the production processes of these industries.
The precise operation and stable output of dispensing machines rely on real-time monitoring and data support from various sensors. The core function of sensors is to provide reliable assurance for the precision control and stable operation of dispensing machines through accurate perception and feedback.
Below are some typical applications of Longan sensors in dispensing machines.
Application 1: Workpiece Position Detection
In this stage, sensors need to accurately confirm that the workpiece has reached the designated position while assisting in calibrating the position deviation of the workpiece, adapting to different appearances and shapes of workpieces. Longan Technology’s PS2 series photoelectric sensors, characterized by their small size and small light spot, can meet the needs for installation in tight spaces and precise positioning. The PS8 series offers products with linear light sources, effectively reducing the risk of misdetection caused by holes on the PCB. The PA8 provides BGS detection distances of 400mm and 600mm with two red light source detection distances, as well as blue light detection at 250mm, suitable for detecting green, deep blue, and dark PCBs and different material housings.
Application 2: Needle Positioning
After powering on the dispensing machine, zero-point calibration and positioning operations must be completed first to ensure that the dispensing needle accurately reaches the designated position for alignment. During the operation of the equipment, continuous work can lead to cumulative positioning errors, requiring timely resetting and recalibration of the needle to eliminate the impact of cumulative errors.
(Common sizes of dispensing machine needles)
Sensors can assist dispensing machines with different sizes of needles to achieve rapid and precise positioning. Longan Technology’s FS10 series fiber sensors paired with dedicated zero-point positioning fibers can adapt to various common dispensing machine needles on the market, quickly capturing the real-time position of the needle, significantly shortening equipment debugging time, and continuously correcting cumulative errors, thereby enhancing the operational precision and production efficiency of dispensing machines, providing key technical support for stable mass production in electronic product manufacturing, and effectively improving equipment production efficiency and dispensing accuracy.
Application 3: Glue Level Detection
The dispensing machine needs to continuously check for dispensing head failures and glue material levels in real-time to ensure the continuity and reliability of the dispensing process, avoiding production interruptions due to equipment failures or insufficient glue material. Longan Technology’s CSM series capacitive sensors are used for real-time monitoring of glue material status and dispensing head conditions. This sensor, based on capacitive sensing principles, can penetrate the tube wall without contacting the glue, accurately determining the “presence” or “absence” of glue. By setting the upper and lower limits of the glue tube, it can simultaneously achieve dual protection against high-level overflow and low-level dry firing, providing critical assurance for seamless production.
Application 4: Inlet Pressure Detection
Compared to ordinary dispensing machines, dual-liquid dispensing machines have an independent dual-link control system that precisely controls the output of two types of glue through air pressure. During system operation, a high-precision pressure sensor installed on the pressure barrel is required to monitor the pressure changes of the two glue paths in real-time.
This system uses Longan Technology’s GPE series pressure sensors, which can quickly and accurately detect the pressure status within the glue path, effectively identifying pressure anomalies caused by pipeline blockages or leaks, thereby avoiding inaccurate glue quantities or equipment failures, ensuring the stability and reliability of the dispensing process.
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