A Guide to Adjusting the Knitting Large Round Oil Needle and Solving Oil Contamination Problems

A Guide to Adjusting the oil Needle of a large circular knitting machine and Solving Oil Stains: The adjustment of the oil needle of a large circular knitting machine is directly related to the lubrication effect of the equipment and the quality of the fabric. Reasonably adjusting the oil needle and controlling oil stains are the core operational points to ensure the stable operation of the equipment and avoid oil stains on the fabric. I. Key Points for Precise Adjustment of the Oil Needle 1. Before adjustment, prepare to stop the machine and cut off the power. Clean the yarn, dust and oil stains around the oil needle and the oil passage. Confirm that the oil in the oil cup is sufficient and the type of lubricating oil matches the equipment requirements (it is recommended to use special lubricating oil for circular knitting machines). Prepare special tools such as screwdrivers and wrenches, and check the standard oil output parameters of the oil needle in the equipment manual. 2. Oil output adjustment criteria: The oil output of the oil needle should follow the principle of “small amount, uniform and precise”. The adjustment parameters of the oil needle at different parts should be set differently: For high-speed rotating friction parts such as the syringe and the heel of the needle: Fine-tune the oil needle knob clockwise to drip 2-3 drops of oil per minute to ensure adequate lubrication without any excess oil accumulation. Precision components such as triangular guide rails and needle selectors: Adjust to 1-2 drops per minute to prevent excessive oil from penetrating the fabric contact surface. After adjustment, start the machine and run it for a trial run of 5 to 10 minutes. Observe the oil film coverage at each lubrication point. If there is no dryness or abnormal noise and no oil dripping onto the fabric surface, it is qualified. 3. Precautions for synchronous calibration: For multi-oil circuit models, it is necessary to ensure that the oil output of each oil needle is consistent to prevent wear due to insufficient oil in some parts and oil overflow and dirt accumulation in others. Regularly inspect the oil needle filter screen to prevent impurities from blocking the oil passage and causing uneven oil output. Adjust the oil output according to the ambient temperature. In high-temperature seasons, it can be appropriately increased by 1 drop per minute. In low-temperature seasons, reduce the oil output to prevent the oil from solidifying. Ii. Causes and Solutions for Fabric Oil Stains (1) Common Causes of Oil Stains 1. Improper adjustment of the oil needle: Excessive oil output, with excess lubricating oil dripping or splashing onto the fabric surface; The oil output is too small, causing the components to rub and heat up. The lubricating oil carbonizes and forms oil stains that adhere to the needle tongue and transfer to the fabric. 2. Equipment seal failure: The sealing gaskets at the oil cup and oil pipe interfaces are aged and damaged, causing oil leakage. The sealing felt ring at the lower end of the syringe is worn, and the lubricating oil seeps along the outer wall of the syringe to the fabric surface. 3. Improper selection or maintenance of lubricating oil: Using inferior lubricating oil is prone to volatilization and carbonization, resulting in oil sludge. The lubricating oil has not been changed for a long time. After impurities are mixed in, it deteriorates and contaminates the fabric during lubrication. 4. Operational and cleaning oversight: Oil stains were not thoroughly cleaned during equipment maintenance, and after startup, they were transferred to the fabric along with the mechanical operation. The oil stains on the hands of the lathe operator may stain the yarn or fabric during operation. (2) Solutions and Preventive Measures for Oil Stains 1. Immediate Handling Plan: Once oil stains on the fabric are detected, stop the machine immediately, recalibrate the oil output of the oil needle, replace the damaged seals, and clean the accumulated oil and grease in the oil passage and on the surface of the components. For fabrics that have been stained with oil, select a dedicated degreaser based on the fabric material for cleaning to prevent the oil stains from adhering due to high-temperature treatment. 2. Long-term prevention mechanism: Establish a regular inspection system for the oil needle: Inspect the oil output status before starting the machine every day, calibrate the oil needle parameters comprehensively once a week, and disassemble and clean the oil needle and oil passage every month. Standardize lubricating oil management: Select high-quality lubricating oil suitable for the model, and replace it regularly as required by the equipment manual. Thoroughly clean the oil cup and oil circuit when replacing. Install oil-proof protective devices: Install oil collection trays and oil-proof baffles in the contact area between the syringe and the fabric to prevent oil from dripping. Regularly replace the syringe sealing felt ring to enhance the sealing performance. Strengthened operation norms: The lathe operator must keep their hands clean and avoid touching yarns and fabrics with oily hands. After the equipment is maintained, the oil stains should be wiped clean before starting production