During machine operation, the stable supply of bottom glue is a critical factor in ensuring continuous production and product quality. If a failure occurs in the glue output process, it’s essential to scientifically troubleshoot and quickly identify the root cause. The following is a detailed troubleshooting guide to help you swiftly locate and resolve bottom glue supply issues.
1. Check the Automatic Glue Supply Switch
When the bottom glue fails to dispense, the first step is to confirm whether the automatic glue supply switch is turned on. In some cases, due to incorrect operation or system reset, the switch may be off. Enter the control interface to check the I/O status and ensure the glue supply function is activated. If the switch is working but the problem persists, proceed to inspect other potential causes.
2. Calibrate the Glue Level Detection Photoelectric Sensor
Misalignment of the photoelectric sensor for glue level detection is another common cause of glue supply failure. If the sensor is not properly aligned with the reference line of the glue tank, it may incorrectly detect the glue level and interrupt the supply process. Re-adjust the sensor position according to the equipment manual and test its sensitivity through simulated operation. Regular maintenance should include checking sensor alignment to prevent sudden failures during production.
3. Inspect the Photoelectric Signal Transmission Line
If the sensor is correctly positioned but the signal fails to reach the PLC system, inspect the wiring. Loose connections, oxidized terminals, or damaged cables can all disrupt signal transmission. Use a multimeter to check for continuity, clean the terminals, and secure the connectors. For complex wiring systems, conduct sectional testing to locate faults quickly and ensure stable signal transmission.
4. Replace Faulty Photoelectric Sensors
If the above steps do not resolve the issue, the photoelectric sensor may be defective. Long-term use or environmental factors such as dust and humidity can cause sensor aging and failure. Replace the sensor with the same model and recalibrate the parameters after installation. Ruizhi Machinery recommends keeping commonly used spare parts in stock to minimize downtime and maintain production efficiency.
5. Clear Glue Hose Blockage
If the automatic glue supply is functioning but the glue still does not dispense, a clogged glue hose may be the culprit. Prolonged use or residual glue can cause internal blockages that hinder glue flow. Disassemble the hose and clean it thoroughly with a specialized cleaning solution, or replace it with a new one. Regular maintenance of the glue hose is an effective way to prevent such issues.
6. Inspect the Pneumatic Control Valve
As a key component in glue delivery, a clogged or damaged pneumatic valve can directly halt glue output. Disassemble the valve to check for glue residue and clean it with compressed air or solvents. If cleaning doesn’t restore functionality, replace the valve. Preventive inspection of pneumatic valves during routine maintenance is strongly recommended.
7. Professional Technical Support
Although this guide provides comprehensive troubleshooting instructions, unforeseen technical challenges may still arise. If the issue remains unresolved, please contact Ruizhi Machinery’s technical support team immediately. Our engineers are available to provide remote guidance or on-site assistance, ensuring your equipment resumes efficient operation as quickly as possible and minimizing production losses.
About Ruizhi Machinery
Ruizhi Machinery leads the way in eco-friendly packaging solutions, committed to a sustainable and innovative future. With over 20 years of expertise, our paper bag machines are recognized globally for their unmatched efficiency and reliability. Trusted by customers in over 120 countries across Europe, America, Asia, and Africa, our products set the standard for quality and performance. For more information about Ruizhi Machinery, please visit www.mted.com or www.wzruizhi.com
