How to repair textile machinery knitting large round machine

Repair of textile knitting large round machine
The maintenance of the knitting circular knitting machine should follow the principle of “troubleshooting first, then precise disassembly, and finally standardized assembly”, focusing on the four key systems of needle bed, triangle, yarn feeding, and transmission. The specific steps are as follows:
1. Troubleshooting: Identify the root cause of the problem
-Listen to the sound: If there is abnormal noise during operation (such as metal impact sound, friction sound), it is most likely due to needle rod bending, triangular wear, or poor meshing of transmission gears; Intermittent abnormal noise occurs, and it is necessary to check whether the tension of the yarn feeder is abnormal.
-Look at the fabric: broken yarns and jumpers are often caused by damaged needle tongues, blocked needle slots, or uneven triangular tracks; Horizontal stripes and missing stitches on the fabric surface may be due to uneven needle beds or offset position of sinkers.
-Check the components: After stopping the machine, check whether the needle bar is flexible, whether there are scratches on the triangle, whether the tension plate of the yarn feeder is stuck, whether the transmission belt is loose, and at the same time, clean the flying flowers and oil stains on the needle bed and frame.
2. Core system maintenance operations
-Needle bed and knitting needle system
-Needle damage: Use a special tool to remove the damaged needle, replace it with a needle of the same model, ensure that the needle tongue opens and closes flexibly, the gap between the needle rod and the needle groove is even, and avoid needle jamming.
-Needle bed deformation: Minor deformation can be fine tuned with correction tools; Severe deformation requires return to the factory for polishing or replacement. After calibration, the flatness of the needle bed needs to be tested, with an error controlled within 0.02mm.
-Triangle system
-Triangle wear: If there are scratches or dents on the triangular track, it needs to be polished with an oilstone; When the wear is severe, replace it directly. During installation, calibrate the triangle angle to ensure it matches the running trajectory of the knitting needle. The fastening screws should be evenly stressed.
-Loosening of triangular seat: Tighten the fixing bolts again and install anti loosening washers to prevent displacement during operation.
-Yarn feeding and tension system
-Uneven tension: Clean the oil stains on the surface of the tension plate, adjust the pressure of the tension spring, and ensure that the tension of each yarn conveyor is consistent; Replace the aging yarn feeding hose to avoid yarn blockage or deviation.
-Fault in yarn breakage detector: Wipe the sensor probe, check the wiring connection, and if it still cannot sense, replace it with a detector of the same model.
-Transmission system
-Belt looseness: Adjust the motor position, tighten the transmission belt, and ensure that the belt tension is moderate (press the belt deflection to 10-15mm); Replace cracked and aged belts.
-Gear abnormal noise: Disassemble the gearbox, clean the impurities between the gears, and add special lubricating grease; When the gear tooth surface is severely worn, it needs to be replaced in pairs to ensure meshing accuracy.
3. Commissioning and maintenance after maintenance
-No load test run: After starting up, run at low speed for 10-15 minutes, observe for any abnormal noise or component heating, and confirm that all systems are running normally.
-Trial weaving with fabric: Use commonly used yarn for trial weaving, check the quality of the fabric surface, adjust the triangle position and yarn tension until the fabric is flawless.
-Daily maintenance: After repair, thoroughly clean the equipment of oil stains and flying flowers, and add special lubricating oil to components such as needle beds, triangles, gears, etc; Regularly inspect vulnerable parts (needles, belts, tension springs) and establish a maintenance ledger.
4. Maintenance precautions
-Make proper markings when disassembling components to avoid confusion of order during assembly; Use specialized tools and prohibit brute force strikes to prevent damage to precision components.
-Electrical faults (such as motor failure or control panel malfunction) should be investigated by professional electricians, who should check the circuit, frequency converter, and sensors. It is prohibited to modify the circuit without authorization.
After the maintenance is completed, it is necessary to check whether the safety devices (such as emergency stop switches and protective covers) are intact to ensure that the equipment meets safety production requirements.