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The Low-e glass, also known as low-radiation glass, is a product composed of multiple layers of metal or other compounds coated on the surface of the glass. Its coating layer has the characteristics of high transmission of visible light and high reflection of mid- and far-infrared rays, making it comparable to ordinary. Compared with traditional coated glass for construction, Low-E glass has excellent heat insulation effect and good light transmittance. In the process of Low-e glass production and processing, other glass residues may be mixed, or the conductive surface may be placed incorrectly on the production line, etc., and the production and processing may be mixed, and the production quality cannot be guaranteed, resulting in waste of production and inconvenience to the company.

In reality, the operators on an entire insulating glass production line generally use electric pens to measure the conductive surface of Low-E glass successively, which is time-consuming and laborious, and the detection cannot guarantee accuracy, product quality, and affect production efficiency. In order to solve the above problems, Jinan LIJIANG GlASS has designed a simple and easy to install and operate "Low-E glass online inspection system", which is suitable for installation on the insulating glass automatic production line and the automatic intelligent vertical Low-E glass film removing machine, to achieve the fully-automatic recognize the film layer of Low-E glass.

 The Working Method of Jinan LIJIANG Glass "Low-e Glass Online Inspection System":

Jinan LIJIANG Glass "Low-E glass online detection system" is roughly divided into four modules: ultrasonic sensor detection module, counting display module, alarm module, control module, according to needs, the counting module can be combined with the control module to realize the counting function separately; the detection module , counting module, alarm module and control module are combined to realize the detection and counting function of Low-E glass. When it is necessary to detect Low-E glass, the limit switch must be raised to contact the glass to achieve the purpose of detection.

Technical Features and Advantages:

  1. The whole system is controlled by industrial single-chip microcomputer, which has the functions of logic identification and online detection, which reduces the redundancy caused by all-use hardware, and uses the cooperation of software and hardware to achieve the purpose of intelligent detection and control.
  2. The limit switch is used to detect whether the conductive surface of the Low-e glass production line is reversed or mixed with other glass, which is stable and convenient.
  3. Automatic counting of glass through ultrasonic sensors, instead of manual labor, saving labor, and can ensure the accuracy of counting, meet the needs of automation, it is convenient and practical, and to a certain extent, it achieves the purpose of a conservation-oriented society.
  4. The counting module and the Low-E detection module can be used in combination or work independently to meet the requirements of different glass processing technologies.
  5. There is no need to modify the existing glass production line, just install this set of equipment to meet the production needs, and has a wide range of practicability.

In fact, as a manufacturer engaged in the production of insulating glass processing equipment for many years, Jinan LIJIANG Glass will face many choices and trade-offs of spare parts. There are many sensors on the market that can be used to detect the existence of Low-E glass film. For example, photoelectric sensors and contact sensors are usually used to achieve this purpose, but when encountering special measurement objects, this method is usually very difficult, such as low-E glass with a shallower layer or coated glass after coating Silicon wafers, due to their special physical characteristics, have always been a problem in detecting their existence. In the application scenarios of glass deep processing, one of the most common problems is the film detection of Low-E glass, but the existence of this special material has now found a suitable method, that is, the use of ultrasonic sensors for detection.

Figure 1 The Ultrasonic Sensors

     Figure 1 The Ultrasonic Sensors

Ultrasonic sensors use sound waves to detect objects, detect objects and measure distances by monitoring the echo from the target or background conditions. In other words, an ultrasonic sensor is a sensor capable of performing distance and position sensing measurement in a manner of transmitting and receiving ultrasonic waves.

Figure 2 The Application of Ultrasonic Sensors

Figure 2 The Application of Ultrasonic Sensors

Since Low-E glass, especially the large-format Low-E glass film, is mostly a very shallow layer, sensors based on the principle of optical photoelectric sensing cannot accurately measure the presence or distance of glass, while ultrasonic sensors can outwardly Transmit ultrasonic waves and receive echoes from the surface of the Low-E glass film. The distance to the object can be estimated by combining the time and velocity of the echo received. Jinan LIJIANG Glass learned that when the time constant measured by the ultrasonic sensor is within the preset range, it indicates that there is glass on the sunroof of the detected vehicle; on the contrary, when the sensor does not receive an echo, it indicates that the presence of glass is not detected.

Figure 3 The Automatic Recognize Low-E Film

Figure 3 The Automatic Recognize Low-E Film 

Because ultrasonic sensors use sound instead of light for detection, they are not susceptible to many challenges that optical sensors usually have, and ultrasonic sensors are not affected by target color, reflectivity, and transparency, simplifying product replacement and reducing downtime. In addition, the lighting conditions in the working area have no effect on the ultrasonic sensor, and the ultrasonic sensor can also accurately monitor in a dirty and humid environment.

Figure 4 The Low-E Film Recognition System from Insulating Glass Production Line

Figure 4 The Low-E Film Recognition System from Insulating Glass Production Line

The ultrasonic obstacle avoidance sensor used by Jinan LIJIANG Glass is a high-resolution (1mm), high-precision, low-power ultrasonic sensor. In terms of design, it not only handles interference noise, but also has the ability to resist noise interference. And for targets of different sizes and varying supply voltages, sensitivity compensation has been made. In addition, it also has standard internal temperature compensation, which makes the measured distance data more accurate. It is especially suitable for the identification and detection of Low-E glass film on the insulating glass automatic production line and the insulating glass automatic vertical Low-E glass film removal machine.


For more information about Jinan LIJIANG Glass insulating glass processing equipment and insulating glass processing accessories, please click here to learn more. 

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